Method and composition for recovery of elastic production tooling

FIELD: machine building.

SUBSTANCE: using mould recovery method in the manufacture of production tooling, made of silicon elastic material, the surface of a mould is pre-treated with a solution of amine or amine mixture in an organic solvent. Then repair mortar is applied, containing high molecular weight silicone rubber, a curing agent and an organic solvent, which additionally may contain a solution of amine or amine mixture in an organic solvent. The invention also relates to a composition for restoring of moulds, made of silicone elastic material. The composition contains a high molecular weight silicone rubber, a curing agent, an organic solvent solution of an amine or a mixture of amines in an organic solvent at a ratio of the wt % - Amine: rubber from 1:20 to 1:50.

EFFECT: when restoring a damaged mould the surface is hardened that prolongs the use of a mould, ensures good traction with the surface of the mould, curing of reducing layer is accelerated, its uniformity is achieved on a complex profile of a mould.

3 cl, 2 dwg, 2 tbl, 6 ex

 

The present invention relates to the field of engineering, specifically to the field of injection molding according to the models and the electroformed products manufacturing.

One of the ways the manufacture of prototype parts for new designs small series seems to be casting them in silicone elastic form of rectoplasty compositions or special waxes, as well as the electroformed growing parts silicone forms. In these cases, a significant problem is the erosion of the surface of the mold under the influence of various active components of filled compositions. In this regard, it is often impossible to ensure long-term operation of the form and hold the desired reproduction quality castings.

Known compositions for forms that includes an elastomer, an organic solvent and other components (Vankovska K.M., Wolanyk G.A., Industrial electroplating. - L. 1986, p.6-12). However, such compositions have a low mechanical strength, it is difficult adjustable curing process that does not allow you to use it to solve our problems. The use of these compounds prevents the presence in their composition of the solvent, which requires removal during the vulcanization process and can lead to the formation of bubbles and thereby compromise the integrity of the surface restored form.

Also known is TNA compositions ("Adhesives and sealants", Ed. Kardashev D.A. - M.: Chemistry, 1978 str-140), which includes serial sealants with a relatively high intrinsic viscosity (due to the absence of solvent), which does not allow for uniform spreading it on the restored surface and leads to the formation of incrustations and thickness variation of the coating. Moreover, in the process of restoration is not provided trusted repair affinity layer with the surface of the coating, so as not there is a mutual penetration of the layers.

Know the use of low-viscosity silicone composition - EN 2052475, 20.01.1996, inclusive, parts by weight: liquid silicone rubber with terminal silanol groups (SCTN, SCTN, SCTP, SCTN-F) 100,0; ethyl silicate-40 30,0-80,0; ORGANOTIN catalyst (K-18, K-1) 3,0-12,0; alkyl(aryl)acetoxysilane 0.5 to 1.5. Alkyl(aryl)acetoxysilane-methylphenyldichlorosilane, methyltriacetoxysilane, dimethyldiethoxysilane, diethyldichlorosilane with the strength of the vulcanizates after 1-3 days of curing a 3.5-8.0 MPa, the adhesive strength of 0.05 to 0.8 kN/m

The authors suggest the use of this composition as a heat-resistant and cold-resistant protective coatings, impregnating compositions, the binder film materials. However, the proposed composition according to the results of our research do not provide the necessary quality of restoration forms, further robotos is osobnosti and the possibility of subsequent re-restore. This is due to the long time of curing (up to 3 days) on the surface that does not meet the requirement of uniform application of the composition on geometrically-complex forms. Moreover, the elasticities of vulcanizates at the repair composition is significantly lower than that of the base material restored form, which inevitably causes a local stress in the surface layers with subsequent deformation and fracture. The adaptability of the application when the specified duration of curing is also unsatisfactory, because the composition of flows with vertical surfaces and accumulate in the grooves.

The closest technical solution method and composition proposed in the patent RU 2 277 553, which was taken as a prototype. Composition for flexible tooling includes a high molecular weight silicone rubber from 2 to 35 wt.%, the curing catalyst (ethyl silicate 40-dibutyltindilaurate) from 0.1 to 0.5 wt.% and organic solvent - rest. The proposed method of using the composition is applied in a thin layer on the working surface of the mold with a smooth top layer. The disadvantage of this method is uneven curing of the coating due to excessive amounts of catalyst in the surface layer of silicone rubber recovered formyromance catalysts "cold" curing silicones, as a rule, heterophony in relation to the basic silicon material used for the production of form, then, accordingly, there is provided a uniform curing of the repair layer. Regenerating layer is different in thickness, composition and degree of vulcanization. After the formation of the strength properties are not constant over the entire surface largely depends on the random fluctuations in the distribution of the catalyst on the surface of the worn layer recoverable form.

The composition proposed in the prototype, is not always universal and effective.

Restoration of forms and increase their endurance is an important and urgent task. For the successful solution of this task, you must use makeup, restoring form and efficient way of its application.

The technical objective of the proposed application is to restore the damaged moulds to harden the surface and prolong the use life forms, to ensure reliable adhesion of the composition to the surface of the form, to accelerate the curing of restorative layer, to achieve uniformity on the complex profile forms.

To solve this problem is proposed composition and method of its application to the surface form for the elimination of emerging on the surface of the form defec the RC. Moreover, the composition and the method of its application enables to restore the damaged surface, in addition to harden it and thereby extend the service life forms. Moreover, the proposed method ensures the uniform application of restorative layer on a complex surface profile forms accelerated curing restorative layer and a reliable bond to the coating composition to the surface of the form.

This objective is achieved in that the additional hardening the surface of the mold is pre-treatment with a solution of an amine or mixtures of amines in an organic solvent. Form with high surface hardness and has a higher endurance and long term use. The surface of the recovered shape in advance evenly cover (2-20)% a solution of the amine (diethylamine) or a mixture of amines (polyethylenepolyamine-PEPA) in an organic solvent (hexane, heptane, etc.) and incubated for 24-3 6 hours at a temperature of 20°C.

Then put any of the compositions for coating forms provided by the present application, for example, are shown in Table 1 and Table 2.

Strong adhesion of the repair compound with the surface of the form is provided by amine component as a processing solution, and additionally introduced directly into the composition of a solution of the amine or mixture of amines.

In this case, as to ensure reliable adhesion of the composition to the surface form, and to accelerate the curing restorative layer contributes an introduction to applied the composition of the amine solution in an organic solvent (5-20%) of the total weight of the composition, considering the mass of silicone. The regulation further accelerate the curing restorative layer is achieved by amine component as a processing solution, and repair of the structure.

Uniformity reducing layer on a complex profile shape is achieved by pre-treatment of surfaces forms, and by accelerating the curing of a layer that prevents the uncontrolled spreading of the composition. Thus, the layer will be more durable, adhesive connected to the repaired surface will accelerate curing, the uniformity will be improved, and thereby improve the reliability of the achieved result.

Proposed for repair of elastic silicone forms of the compositions and their properties are shown in tables 1 and 2.

The increased speed of curing of the applied layer due to the additional amine component will have a beneficial effect on his uniform at the completion of the recovery process of the form.

Table 1 shows the compositions and their properties for renovation elastic silicone forms.

Table 1
Compositions for repair of elastic silicone forms and their physico-mechanical parameters
CompositionThe cure time, minTensile strength, MPaElongation at elongation, %Hardness shore aAdhesion to the surface, the strength of the peel, n/m
Wascompletely rubber SKTV 2 wt.%
the curing catalyst is 0.1 wt.% (ethyl silicate 40 dibutylaniline in soot:1)
solvent-hexane rest
20-301,7300350,45 (2 days)
2. High molecular weight rubber SKT 4 wt.%
the curing catalyst is 0.1 wt.% (ethyl silicate 40 dibutylaniline rela. 4:1)
the solvent is heptane rest
30-402,0300350,50 (2 days)
3. Vysokomolecul the RNA rubber SKTV-1 to 15 wt.%
the curing catalyst is 0.1 wt.% (ethyl silicate 32 dibutylaniline rela. 4:1)
the solvent is heptane rest
100-2002,5350350,60 (after 1 day)
4. High molecular weight rubber SKT 20 wt.%
the curing catalyst is 0.4 wt.% (ethyl silicate 40 octoate tin be considered. 7:1)
150-2002,5350400,80 (2 days)
5. High molecular weight rubber SKTV 35 wt.%
the curing catalyst is 0.1 wt.% (ethyl silicate 32 octoate tin in soot:1)
the solvent is heptane rest
200-3002,8390400,80 (after 1 day)
6. High molecular weight rubber SKTV 6 wt.%
the curing catalyst of 0.5 wt.% (ethyl silicate 32 determinability tin be considered. 6:1)
solvent-octane else
50-602,6370451,3 (after 1 day)

Table 2 shows the compositions and their properties for renovation elastic silicone forms with added amine components.

Table 2
Compositions for repair of elastic silicone forms and their physico-mechanical parameters
CompositionThe cure time, minTensile strength, MPaElongation at tensile,
%
Hardness shore aAdhesion to the surface, the strength of the peel, n/m
Wascompletely rubber SKTV 2 wt.%
the curing catalyst is 0.1 wt.% (ethyl silicate 40 dibutylaniline in soot:1)the PEP - 0.1 wt.%,
solvent-hexane rest
17-251,7320350,65 (2 days)
2. High molecular weight rubber SKT 4 wt.% the curing catalyst is 0.1 wt.% (ethyl silicate 40 dibutylaniline rela. 4:1) of PEP-0.1 wt.%,
dissolve the al-heptane rest
25-352,0330350,70 (2 days)
3. High molecular weight rubber SKTV - 1 to 15 wt.%
the curing catalyst is 0.1 wt.% (ethyl silicate 32 dibutylaniline in soot:1)the probe - 0.3 wt.%
the solvent is heptane rest
95-1502,5360350,63 (after 1 day)
4. High molecular weight rubber SKT 20 wt.%
the curing catalyst is 0.4 wt.% (ethyl silicate 40 octoate tin in soot:1) the probe - 0.7 wt.%, solvent-octane else
130-2002,5400400,94 (2 days)
Wascompletely rubber SKTV 35 wt.%
the curing catalyst is 0.1 wt.% (ethyl silicate 32 octoate tin in soot:1) the probe - 1.0 wt.%
the solvent is heptane rest
160-2002,842040 1,18 (after 1 day)
6. High molecular weight rubber SKTV 6 wt.%
the curing catalyst of 0.5 wt.% (ethyl silicate 32 determinability tin in soot:1) the probe - 0.2 wt.%,
solvent-octane else
40-502,6400451,35 (1 day)

The proposed materials is illustrated by the following drawings and examples.

Figure 1 - shape recovery, pour outside,

1 a - form with areas of erosion on the surface,

1 b - form is covered on the outside with a solution of an amine,

1 - form, coated with the composition after repair.

1. Areas of erosion.

2. A layer of amine solution.

3. Composite layer.

Figure 2 - shape recovery, fill inside containing a matrix and a punch.

2A - form disassembled, the matrix on the left, punch right. Areas of erosion on the surface.

2B is a form covered outside of the amine solution.

2B - form, coated with the composition after repair.

4. Areas of erosion

5. The solution layer Amin

6. Composite layer

In the composition used:

General properties of the curing agent is able to form a vulcanizer in a wide time range.

Organic is actuarial. As solvent is preferred hydrocarbons5-C9. The best results are hydrocarbons linear type or acyclic structure.

Examples illustrate the positive effect of the use proposed for consideration of the application, namely, that restorative composition provides a surface layer strength, uniformity and solidity. The process is favored by cohesive and adhesive interactions in the border layers, combinations of amine and solvent contribute to the interpenetration of the layers. This ensures the durability of the thin sections and small fragments of the surface profile and as a result, increase resource additional post-repair manual forms and efficiency of the whole process.

Offered for consideration compositions are illustrated by the following examples.

Example 1

Restored form, used in the manufacture of products, fill outside forms (Figure 1). The form was made from domestic silicone sealant U-4-21. Products made from epoxy composite cold-curing, ester plasticized by the plasticizer. After 17 release cycles on the surface of the mold appeared irregular shaped notch 1 depth of from 0.05 mm (Figa).

the La repair form defective working surface of the tool within 2-3 minutes evenly cover the 10% solution polyethylenepolyamine (PEPA) in hexane 2 - (Fig). After 24 hours exposure to the surface evenly applied layer of the composition:. Rubber SKTV - 35 wt.%; the curing catalyst is 0.1 wt.% (ethyl silicate - 32: octoate tin in the ratio of 10:1, respectively) solvent - heptane - the rest (table 1 5) (Pigv).

After evaporation of the solvent on the surface of the mold is formed of a uniform composition layer 3, completely eliminating surface defects (Pigv). After 48 hours, the form can be re-commissioned.

After repair form withstood additional 19 release cycles.

Example 2

Restored form, used in the manufacture of products from rectoplasty, fill inside the form (Figure 2). Material for the manufacture of forms served sealant GED-1. The form consisted of a matrix and a punch (Figa). In the molding surfaces form appeared gouges and defects 4 - (Figa). After disassembly of the forms on the inner surface of the matrix and punch for 3-4 min evenly applied 20%) solution of probes in heptane 5 (Fig). after 24 hours on the surface of the matrix and punch put a layer of the composition: high molecular weight rubber SKTV - 2 wt.%; the curing catalyst is 0.1 wt.%>(ethyl silicate 40: dibutylaniline in the ratio 3:1, respectively); the solvent is hexane OS the material (table 1 1).

After evaporation of the solvent on the surface of the mold is formed uniformly reinforced composite layer 6, fully restoring surface defects form (pigv). After 48 hours, the mold was re-commissioned. After repair form withstood 21 eat.

Example 3

Restored form, used in the manufacture of products, fill inside the form.

The form was made from domestic sealant U1-18, plasticized polymethylsiloxanes liquid PMS-50 mass ratio of 10:1 and consists of a matrix, punch (Figure 2).

Material for the manufacture of forms served sealant U-4-21. After 15 release cycles of the epoxy composition when disassembling form defects 4 on the surfaces of the matrix and punch (Figa). To eliminate erosion on the defective surface is applied a solution of 20% of the probes in heptane 5 (Figb).

Then after 30 hours evenly applied layer of the composition is a high molecular weight rubber SKT-5 wt.%, the curing catalyst 0.1 wt.% (ethyl silicate - 40 - dibutylaniline in the ratio 3:1 respectively). The polyethylenepolyamine (Pepa) 0.1 wt.%, solvent-hexane - rest.

After evaporation of the solvent on the surface of the mold is formed uniformly reinforced composite layer 6 (Pigv), fully restoring surface defects form. After 48 califorma was re-commissioned.

After repair form withstood 38 releases.

Example 4

Restored form, used in the manufacture of products from epoxy composite cold-curing, ester plasticized by the plasticizer.

The form consisted of a matrix and a punch 2 Is made of domestic sealant U-2-28.

After 14 release cycles on the surface of the mold appeared multiple grooves and roughness 4 depth from 0.02 to 0.15 mm (Figa). For repair form defective working surface for 2-3 minutes to evenly cover the 15% solution of probes in hexane. Then after 27 hours evenly applied composition: high molecular weight rubber SKTV 4%, catalyst curing ethyl silicate - 40, dibutylaniline in the ratio of 4:1, respectively, of the probe - 0.2 wt.%, the solvent is heptane - rest.

The reduced form after 48 hours again put into operation.

After repair form withstood 33 removal. Then the form of lost functionality due to mechanical destruction of the body of the form.

Example 5

Recovered form (Figure 1), used for the manufacture of products by way of the electrotype. Material for the manufacture of forms served the domestic compound of KLSE-305. After 31 pickup surface has lost the necessary glossy appearance, formed mechanical defects 1, distorting verhnostny invoice grown products (Figure 1).

For repair forms a working surface for 2-3 minutes to evenly cover the 15% solution of probes in heptane 2 (Figb). After 24 hours exposure to the surface evenly applied layer of the composition:

high molecular weight rubber SKTV-1 to 15 wt.%. The curing catalyst 0.1 wt.%, ethyl silicate - 32 dibutylaniline in the ratio of 4:1, respectively. PEPA - 0.3 wt.%, the solvent is heptane - rest. Table 2 p.3. 48 hours after repair form was re-commissioned and passed the advanced 56 releases. Then the form of lost functionality due to mechanical failure.

After repair form withstood 56 releases.

Example 6 - control and without prior surface treatment of the amine solution.

Restored form, used in the manufacture of products, fill inside the form (2).

The form was made from domestic sealant U2-2 8 and consisted of a matrix and a punch.

The product was made from epoxy composite cold-curing, ester plasticized by the plasticizer.

After 16 sets on the surface of a punch and a matrix formed defects 4 (Figa). After repair form composition No. 1 of table 1 without the use of pre-treatment with a solution of amine in the solvent form was re-commissioned. After removal of the product was observed focal peeling of the cured repair layer.

After repair form withstood 5 releases.

Form failed and was removed from the production process.

The above examples illustrate the positive effect of the use of the present invention lies in the fact that regenerating composition provides a surface layer strength, uniformity and solidity. This favors cohesion-adhesive interaction in the border layers, the combination of amine and solvent contributes to the interpenetration of the layers. Thereby guaranteeing the durability of thin sections and small fragments of the surface profile.

The physical properties of the claimed composition, namely turnover, allow repeatedly to eliminate cavities, the effects of erosion on the mold surface and other defects arising during operation by means of repeated or partial application of the composition to the surface of the form. The claimed composition is well eliminates defects caused form, allows the necessary modification of the surface to the desired specifications of the state.

From the comparison of the results of example 1 and 2 with the results of example 6 shows that the repair form without pre-treatment with amine solutions though and gives a positive result, but its effectiveness is much lower than when using the offer the way, using similar repair composition.

From the comparison of the results of examples 3 and 4 with the results of examples 1 and 2 follows the expediency of adding to the repair composition of the amine component. Since the subsequent operation forms is much higher. There is the effect of applying the method and composition of the repair forms during electrotype (Example 5).

Experimentally it is established that a positive result is achieved using formulations, recipes that proportion: Amin (a mixture of amines): the rubber is in the range from 1:20 to 1:50. With more specific content of amines is observed acceleration of the curing process, undesirable, while ensuring the uniformity of simplified composite layer. With a ratio of 1:50 there is a minimum efficiency from adding amines to the repair composition. Further reduction of the specific content of amines is impractical because the positive effect of their presence in virtually disappears. In table 2 the ratio of amine: a mixture of amines is presented in the following values: 1:20; 1:30; 1:35; 1:40; 1:50 respectively.

From the analysis results, it follows that complicated technology or composition provides a significant advantage by resource recovered snap-in, and consequently, the technical and economic benefits.

Analysis of the data which provides the following advantage of the proposed method and composition compared with prototype:

- the inventive method provides for the formation of a solid and monolithic coating by increasing the cohesion between the layers and flatten the concentration of the curing component on both sides of the border between layers;

- the claimed method can reduce the stresses on the boundary of the shape-repair composition and to achieve a more uniform coating on the form after repair;

thanks to the application of the method improves the application of the applied repair composition to be greater in comparison with the prototype depth. Due to the introduction of amine repair component part, increases the strength of the layers and their cohesive affinity;

- expands the possibility of multiple recovery silicone forms due to the combined efficiency of the method and composition of,

- increases the efficiency of the repair and subsequent operation in comparison with the prototype,

only the stated set method and composition will allow the best to use silicone snap by improving its working resource.

- the introduction of the repair layer in comparison with the composition of the prototype additional amine component provides acceleration of the curing composition, the improvement of physico-mechanical properties of the vulcanizate coverage, an increase in the adhesion strength of the coating to the OS the ESD surface shape, increase the service life forms after repair.

Analysis of the properties of the proposed composition and prototype shows that the physical-mechanical characteristics of the proposed composition is comparable or slightly better than the prototype. At the same time there is a significant superiority over the prototype as adhesion properties, and the ability to adjust the speed of curing of the applied layer.

The rate of formation of the solid coating flexibly regulated, and the inventive composition provides a surface layer strength, uniformity and solidity. This favors cohesion-adhesive interaction in the border layers, the combination of amine and solvent contributes to the interpenetration of the layers. This ensures the durability of the thin sections and small fragments of the surface profile, as a consequence - increase resource additional post-repair manual forms and efficiency of the entire technological process.

This composition was manufactured and tested in the laboratory of polymer formation JSC "Integrated technical service" in St. Petersburg.

The resulting composition satisfies all the requirements of the technical specifications. Was a pilot batch of the composition. Experimental use of the proposed composition when in the formation of elastic snap showed its high efficiency and ease of use. This composition is recommended for further use in production.

1. The method of recovery forms in the manufacture of tooling, made of silicone elastic material, by drawing on the defective surface repair compound containing high-molecular silicone rubber, curing catalyst and an organic solvent, characterized in that, with a view to further strengthening the surface of the mold, and secure attachment of the repair composition to the repaired surface, the surface pretreated with a solution of an amine or mixture of amines in an organic solvent.

2. The method according to claim 1, characterized in that the composition further added a solution of amine or mixture of amines in an organic solvent.

3. Composition for recovery forms, made of elastic silicone material containing high-molecular silicone rubber, curing catalyst and an organic solvent, characterized in that a restorative composition further added a solution of amine or mixture of amines in an organic solvent at a ratio of wt.% Amin:the rubber from 1:20 to 1:50.



 

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1 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention discloses a layer or coating having a matrix consisting of a binding system and ceramic particles, as well as boron nitride in form of particles which are included in the matrix, where the boron nitride particles are particles of hexagonal boron nitride, and the binding system includes an organosilicon and/or inorganic binder selected from a group comprising particles of oxides of aluminium, titanium, zirconium or boehmite. The invention also discloses a composition for making said layer or coating; a method of making said layer or coating; using the composition which contains boron nitride as material for coating surfaces which are in contact with salty solutions; and water treatment apparatus having components which are in contact with salty water.

EFFECT: disclosed layer or coating prevents crystal settling even at room temperature, is suitable for substrates with surfaces made from metal, glass, ceramics, enamel or smooth plastic, where the layer or coating has longer service life.

19 cl, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to design of materials having neutron-absorbing properties, and can be used as a protective layer in making transportation and packaging structures for transportation and storage of spent nuclear fuel, as well as biological protection from other neutron radiation cases. The filling compound contains polydimethylsiloxane with terminal hydroxyl groups, low-molecular weight polydimethylsiloxane with terminal trimethylsilyl groups, a boron compound, ethyl silicate, an organotin curing agent.

EFFECT: obtaining a composition having high fluidity under normal conditions, which can be used as a protective layer for transportation and packaging structures and high thermal stability (prolonged operation at temperature of up to 22°C).

1 tbl

FIELD: chemistry.

SUBSTANCE: separating organosilicon O/W type microemulsion consists of 80-40 wt % water and a dispersed phase containing polydiorganosiloxane of general formula R1Si(CH3)2O[Si(CH3)2O]x[Si(CH3)R2O]ySi(CH3)2R1 where R'-CH3, C2H3, OH; R2 - alkyl C1-C14, CH2CH2CF3, C6H5, (CH2)3OCH2(CF2)4H; x=30-1000, y=0-350, in amount of 10-30 wt % and an emulsifying agent - polyoxyalkylene polyorganosiloxane block-copolymer of general formula R3Si(CH3)2O[Si(CH3)2O]m[SiCH3R4O]n[SiCH3R2O]pSi(CH3)2R3 where R2 has the same value as above, R3-CH3, C8H17, C12H25, CH2CH2CF3, C6H5; m=10-50, n=50-5, p=3-10; R4-(CH2)3O[CH2CH2O]a[CH(CH3)CH2O]bR5; where R5-H, CH3, C4H9; a=0-25, b=25-0, in amount of 10-30 wt %.

EFFECT: obtaining a separating organosilicon microemulsion with longer service life of the emulsion in diluted form for efficiently conducting different processes.

1 dwg, 11 ex

FIELD: chemistry.

SUBSTANCE: insulating double-glased window has at least two glass sheets spaced apart, a low thermal conductivity gas in between and a gas sealing element containing a curable sealing compound. The sealing compound consists of a) polydiorganosiloxane, which is permeable to said gas and the polydiorganosiloxane has a silanol end, having the following formula: MaDbD'c, in which a=2, b≥1, c equals zero or a positive whole number, M=(HO)3-x-yR1xR2ySiO1/2, in which x=0, 1 or 2, and y=0 or 1, provided that (x+y)≤2, R1 and R2 denote univalent C1-C60 hydrocarbon radicals; D=R3R4SiO1/2, in which R3 and R4 denote univalent C1-C60 hydrocarbon radicals; D'=R5R6SiO2/2, in which R5 and R6 are independently selected from univalent C1-C60 hydrocarbon radicals; b) at least one polymer which is at least less permeable to said gas than the polydiorganosiloxane polymer; c) a cross-linking agent; and d) a cross-linking catalyst.

EFFECT: obtaining insulating double-glased window with improved heat insulation stability and longer service life.

36 cl, 4 dwg, 3 tbl

FIELD: chemistry.

SUBSTANCE: heat-resistant electrically insulating composition contains polydimethyl vinyl siloxane rubber, polyorganohydride siloxane, silica filler, a curing catalyst based on platinum, and 1,2-dihydroxyanthraquinone. The composition can additionally contain different process additives.

EFFECT: obtaining a heat-resistant electrically insulating composition, which provides protection from reverse current of components of semiconductor power devices at high temperature.

5 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: curable composition contains: (A) two organopolysiloxanes and (B) two organohydrogenpolysiloxanes, where the organopolysiloxanes and organohydrogenpolysiloxanes contain linear and resinous polyorganosiloxanes; (C) filler - 15-45 parts per 100 parts of polyorganosiloxane (A); (D) a catalyst and (E) an inhibitor.

EFFECT: invention increases breaking strength and reduces hardness of the curable composition.

30 cl, 6 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: organosilicon elastic moulding compound contains low-molecular siloxane rubber, polydimethylsiloxane liquid and zinc oxide, as well as a curing agent.

EFFECT: reduced distortion of geometrical parameters of elastic moulds and reduced environmental and human health hazard.

2 tbl

FIELD: chemistry.

SUBSTANCE: the invention relates to coating compositions. The compositions contain alkoxy-functional and/or silanol-functional silicone; as well as epoxy-functional silicone and a hardening agent which includes sylon, described by the formula BrcSi(OR3)3-e.

EFFECT: technology of producing elastic weatherproof coatings.

15 cl, 3 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: method of modifying polymer materials involves mixing liquid thermosetting plastics or liquid plastisols of polyvinyl chloride and a decomposition inhibitor based on nanodispersion of montmorillonite, intercalated with metal ions with particle size not greater than 150 nm with metal content of 1-5 wt %. The mixing process is carried out using ultrasound with power of 30-75 W/cm2 and frequency 20-50 kHz for 3-10 minutes. Before curing, the obtained composition is vacuum-treated until complete removal of gaseous products. 0.5-5.0 wt % of the inhibitor per weight of the polymer material is used. Preferably, a nanodispersion of montmorillonite intercalated with cerium (Ce3+) ions used. The method of producing the decomposition inhibitor involves enrichment of montmorillonite-based layered material (bentonite - Na+ form) with sodium ions (Na+) by treatment and holding in 5-20% aqueous sodium chloride solution, washing with deionised water and drying the obtained half-finished product. The obtained half-finished product undergoes intercalation using 0.3-20% aqueous solutions of inorganic salts of magnesium, scandium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, tin, lead, cerium or combinations thereof. After enrichment and intercalation, drying is carried out at temperature not higher than 110°C.

EFFECT: reduced decomposition in polymer materials under thermal, oxidative factors, improved inhibiting properties of the decomposition inhibitor while simultaneously reducing production cost thereof.

9 cl, 4 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a smoothing composition consisting of one or two polyorganosiloxanes for a yarn, fibre or thread, which can be weaved using a method which does not include a smoothing or washing step, containing said composition on at least part of their surface. The invention also relates to a method of producing said yarn, fibre and thread. The invention also relates to a woven fabric, made from said yarn, fibre or thread, using a method which does not include a smoothing or washing step, i.e. dry weaving. Said yarn, fibre or thread and the obtained woven or knitted fabric are used for air bags.

EFFECT: improved characteristics of the fabric, necessary when the fabric is used for air bags - resistance to attrition, abrasive wear, fire-resistance and thermal stability.

19 cl, 1 tbl, 16 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a curable composition consisting of two parts, which is stable during storage in form separate parts and solidifies when merged to obtain an essentially homogeneous polyurethane-polysiloxane mixture. Said composition contains (a) a first dry part containing a moisture-curable silylated polyurethane resin obtained (i) by reacting a polyurethane prepolymer with terminal isocyanate groups with at least one silane selected from a group consisting of mercaptosilaine and aminosilane, and a cross-linking agent for diorganopolysiloxane with terminal silanol groups; (b) a second part containing diorganopolysiloxane with terminal silanol groups; (c) a catalyst for condensation in the first and/or second part; and possibly (d) at least one additional component selected from a group consisting of diorganopolysiloxane with terminal alkyl groups, filler, a UV stabiliser, an antioxidant, an adhesion promoter, a curing accelerator, a thickener, a plasticiser, a moisture absorber, a pigment, a dye, a surfactant, a solvent and a biocide; where the additional component is present in the first and/or second parts of the composition depending on the part with which it is compatible. The invention also describes an essentially homogeneous polyurethane-polysiloxane mixture used as a sealant, adhesive or coating, obtained during solidification as a result of merging the first and second parts of said composition.

EFFECT: obtaining a composition consisting of two parts, which is stable during indefinite storage but undergoes fast solidification upon merging the two parts to obtain a polyurethane-polysiloxane mixture with good weather resistance and high heat resistance.

13 cl, 5 ex, 2 tbl

FIELD: process engineering.

SUBSTANCE: proposed method comprises heating multilayer glass surface in cleavage section and heating liquid translucent resin. Heated translucent resin in introduced into cleavage to be pressed on. Multiplayer glass is cooled and thick translucent resin is applied on cleavage filled with liquid translucent resin. Then thick translucent resin is polymerised by UV beam. Note here that multilayer glass surface and liquid translucent resin are heated by hot air. Note also that heated liquid translucent resin is forced into cleavage by syringe with needle. Note that cleavage is pressed on by rigid rod. Prior to cool, cleavage filled with liquid translucent resin is covered by translucent film. In cooling multilayer glass, amount of liquid translucent resin in cleavage is replenished by syringe with needle, level of liquid translucent resin is controlled visually through said translucent film.

EFFECT: simplified process.

3 cl, 1 tbl

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