Cross-linkable aramide copolymers

FIELD: chemistry.

SUBSTANCE: present invention relates to production of cross-linkable aramide copolymer compositions and articles made therefrom. The composition contains an aramide copolymer obtained from monomers containing 1,4-phenylenediamine and tetraphthaloyl dichloride, and having at least one arylene-carboxylic acid link and at least one hydroxyarylene link. Alternatively, the composition contains an aramide copolymer obtained from monomers containing 1,4-phenylenediamine and tetraphthaloyl dichloride, and having at least one arylene-carboxylic acid link or at least one hydroxyarylene link and a covalent cross-linking agent. The invention also relates to cross-linked copolymers obtained from said composition and moulded articles containing such cross-linked copolymers.

EFFECT: invention enables to obtain materials with improved operational properties.

15 cl, 9 ex

 

The present invention relates to stapling aramid copolymer composition, derived from it stitched the aramid copolymer and to a method for the specified aramid copolymer. In addition, the present invention relates to molded articles and to methods for their manufacture, and also to spinning solutions containing stitched copolymers.

Zelnormamateza polyamides, i.e. aramid, and methods for their preparation are known for several decades. Such materials are suitable for the production of fibers, monofilaments, fibrous binder, filament yarn, films, fibrous mass, balagopalan sheet materials and other molded products and are widely used due to their excellent thermal, mechanical and chemical resistance. Commercially available aramids are supplied to the market under such trademarks as Twaron®, Kevlar® and Technora®.

Although such materials are extremely commercially successful, there remains a need in their improvement, in particular, due to the fact that they need to improve their properties in the transverse direction, including strength and chemical resistance. The aim of the present invention to provide a material having the properties in the longitudinal direction, at least similar to the characteristics of the commercial product is in, with improved properties in the transverse direction. Another objective of the present invention to provide materials having other improved properties, including improved flame-retardant properties. The present invention is also getting aramid products having improved dielectric properties and high resistance to compression. In addition, the present invention is to obtain aramid products having high chemical resistance, in particular, to sulphuric acid, which makes such aramid products suitable for use in drip pans or other devices to capture aerosols. Now found that the above problems can be solved by modification of known aramid polymers that make possible the binding.

In U.S. patent US 5212258 described aramid copolymer containing carboxyl side groups and received by copolycondensation aromatic diamines, aromatic dibasic acids (or their derivatives) and diaminophenylmethane acid with the formation of the aramid block copolymers containing carboxyl groups. Such copolymers are used as such; for further reactions such copolymers, including the stitching, not reported. Moreover, such polymers containing them to the position as such is not capable of binding.

Given these tasks, the present invention relates to aramid copolymer compositions containing aramid copolymer, comprising at least one link arylenecarborane acid and at least one hydroxyechinenone link, or containing aramid copolymer, comprising at least one link arylenecarborane acid or at least one hydroxyechinenone link, and a crosslinking agent.

In comparison with the known aramid copolymers, including Twaron®, such copolymers contain aromatic carboxylic and possibly aromatic hydroxyl functional groups. If these copolymers contain both aromatic carboxylic and aromatic hydroxyl groups, one molecule of such a copolymer can be crosslinked with another molecule of the specified copolymer. If such copolymers contain only aromatic carboxyl group, the composition should contain a crosslinking agent, comprising at least two functional groups. The term "crosslinking agent" has the meaning common to the art, i.e. it refers to a substance that can bind two molecules of larger size (usually polymer) through the formation of covalent bonds between them. The connecting group is called shivaya group. Therefore, ion binding molecules or ions with the specified molecules of larger size is treated not as a staple, but as the salt formation.

In suitable conditions, hydroxyl group and carboxyl group can react to form an ester bond with the removal of water molecules. Perhaps a preliminary transformation of the carboxyl group in the carboxyl derivative to expedite the specified reaction. For example, the carboxyl group can be converted into carbonylchloride or toilet and then introduced into a reaction with a hydroxyl group, which is part of another molecule of the same polymer or molecules of a different kind. If stapling applies a crosslinking agent, carboxyl or hydroxyl group reacts with a crosslinking agent one functional group of the latter, while the second functional group reacts with another molecule of aramid copolymer with obtaining crosslinked aramid copolymer, which comprises a crosslinking group. Suitable cross-linking groups contained in the epoxy, (blocked) isocyanates, aziridine, azetidine, oxazoline, polyols, polyvinylpyrrolidone (PVP), melamine and oligomers and polymers composed of at least two carboxyl groups, including polyacrylic acid, Polimetall the OIC acid, copolymer of acrylic and maleic acid, the polycondensation product of a dianhydride of 3,3',4,4'-biphenyltetracarboxylic acid with 1,4-phenylenediamine, a copolymer of 1-vinyl-2-pyrrolidone with maleic anhydride.

Suitable isocyanates include aliphatic, alicyclic and especially aromatic polyisocyanates and combinations thereof. Representatives of such isocyanates are diisocyanates, including meta - or para-delete the entry, toluene-2,4-diisocyanate (TDI), toluene-2,6-diisocyanate, hexamethylene-1,6-diisocyanate, tetramethylene 1,4-diisocyanate, cyclohexane-1,4-diisocyanate, hexahydrotriazine and its isomers, naftilan-1,5-diisocyanate, 1-were-2,4-phenyldiazonium, difenilmetana-4,4'-diisocyanate, difenilmetana-2,4'-diisocyanate, 4,4'-diphenyldiisocyanate, 3,3'-dimethoxy-4,4'-diphenyldiisocyanate and 3,3'-dimethyldiphenylamine-4,4'-diisocyanate, triisocyanate, including toluene-2,4,6-triisocyanate, and polyisocyanates, including 4,4'-dimethyldiphenylamine-2,2',5,5'-tetrazocine and various polymethylenepolyphenylisocyanate. When implementing the present invention can also be used crude polyisocyanate, including crude polyisocyanate obtained by postironium mixture of Dalwallinu or crude polyisocyanate obtained by postironium raw methylenedianiline.

Suitable polyols include all the I polyvinyl alcohol (PVA), having an average hydroxyl number from about 20 to about 300, preferably from about 40 to about 100. In addition, these polyols preferably contain from about 2 to about 8 hydroxyl groups per molecule. Examples of suitable polyols are polyols that are commercially available under the trademarks Lutrol®and Desmophen® and Bayhydrol®. Particularly suitable polyol is aramid copolymer containing aromatic units and at least two aromatic hydroxyl groups. Such copolymers can be obtained, for example, by polycondensation PPD and TDC in the presence of an aromatic monomer containing hydroxyl group, including derived dioxybenzene, in particular in the presence of 3,3'-dioxybenzene (DHB). DHB and other aromatic monomers containing hydroxyl groups, such as are cross-linking agents suitable for aramid copolymers, which are composed of the carboxyl group.

Suitable polyvinylpyrrolidone include polymers of vinylpyrrolidone having a molecular weight equal to 400 and above. The preferred PVP having a molecular weight of 100,000 and above.

Suitable polyepoxide include diglycidyl ether of bisphenol a and diglycidyl ether of bisphenol f, polyglycidyl ethers available under the trademark Denaol®, and epoxy resin available under the trademark Araldite®.

Suitable aziridine and azetidine include trimethylolpropane-Tris-(2-methyl-1-aziridination), commercially available under the trademark crosslinker CX-100 (from DSM), and cross-linking agents series XC from Shanghai Zealchem.

Suitable oxazoline include aromatic compounds such 1,4-VBOs (1,4-phenyltriethoxysilane), 2,2'-bis-(2-oxazoline), thiodiethyl-bis-(2-oxazoline), tetramethylene bis-(2-oxazoline) and oxydiethylene-bis-(2-oxazoline).

Suitable melamine include resin type Cymel®.

Suitable polyacrylic acids include polymers of acrylic acid and methacrylic acid, having a molecular weight of from 500 to about 1500000, more preferably from about 10,000 to about 500000.

Properties of aramid related to the linearity of the molecules, it is preferable to maintain through the use of para-aramid polymers. To achieve a sufficient degree of crosslinking of at least 1%, preferably, to avoid over-stitching, no more than 20% of the aromatic units of the polymer should contain carboxyl or hydroxyl functional group.

The copolymers according to the present invention is obtained by means of polycondensation, which as such is well known in the prior art. Therefore, it is possible traces the th well-known polycondensation reactions of aromatic monomers, however, a necessary part of conventional monomers substituted monomers comprising carboxyl functional groups and/or monomers comprising hydroxyl functional groups. Instead of using monomers comprising carboxyl functional groups and/or monomers comprising hydroxyl functional groups, can be used a monomer containing both carboxyl and hydroxyl groups, such as 2,5-diamino-4-oxybenzone acid.

The method of obtaining aramid copolymers primarily involves the polycondensation of diaminoethylene with irelandeconomy acid or a mixture of copolymers obtained by polycondensation of diaminoalkylene, irelandeconomy acid and diaminoalkanes acid or its derivative and/or oxydianiline or its derivative with a crosslinking agent.

Monomers suitable for polycondensation, are monomers containing no functional groups, including PPD, which represents a 1,4-phenylenediamine (also known as 1,4-diaminobenzene), and TDC, representing terephthaloylchloride (also known as 1,4-bestimmtheit), representing the main components of the conventional aramid polymers, and monomers containing functional groups, including 1,4-what aminobenzene acid (DABA), 2.5-diaminophenol (DAP), 3,3'-deoxybenzoin (DHB) and 2,5-diaminohexane (DAH) or their salts. The chemical formula of these compounds is shown below:

If aramid copolymer contains at least one link arylenecarborane acid or at least one aromatic hydroxyl group, the composition should include a crosslinking agent, for example hydroxyl - or carboxyl-containing aromatic compound. Such a crosslinking agent may also represent any other aramid copolymer, which consists of a hydroxyl or carboxyl functional group, or another polymer containing hydroxyl groups, for example polyvinyl alcohol (PVA), or a polymer containing carboxyl groups, such as polyacrylic acid (PAC). Examples of such monomers are including monomers and DAP DHB, and 1,4-VBOs:

Stitched copolymers can be used in spinning solutions from which can be obtained crosslinked polymers. Such spinning solutions may contain other necessary components, including calcium chloride, and various solvents, including NMP (N-organic). The preferred solvent is sulfuric acid. Such spinning solutions can be used is for spinning fibers, fibrous masses, fibrous binder, etc. or for sheets and films. Moulded products, like the above, are also the object of the present invention.

It is found that the polycondensation of monomers, including PPD, TDC and up to 20% DABA, when using the known ways of obtaining Twaron® is proceeding smoothly and easily. Also found that this material can be mixed with aramids, containing Oh-groups, or with other cross-linking agents and stitched them or may be subjected to intramolecular or intermolecular crosslinking by heating, if aramid copolymers contain both carboxyl and hydroxyl groups. Therefore, the aramid-based DABA, also containing Oh-groups in the same polymer chain, is capable of forming ester linkages and consequently to the stitching.

The present invention is further illustrated by examples which are not limiting.

Example 1

Into a clean dry flask with a volume of 2 l, equipped with a mechanical stirrer, input and output of nitrogen and outlet for vacuum, in nitrogen atmosphere was loaded 20,719 g PPD, 3,249 g DABA, 3,352 g of 1,4-VBOs and 400 ml of dry NMP/CaCl2(to 12.1 wt.%). The flask was twice purged with nitrogen. The mixture was stirred 30 min at 150 rpm with the aim of dissolving the amines.

The flask was cooled to 10°With a mixture of ice and water. After removal of the cooling medium speed manual is the air traffic management was set equal to 320 rpm and introduced through the funnel into the flask 43,219 g TDC. The funnel is washed twice with 25 ml of dry NMP/CaCl2. The flask was closed and left the mixture to react for 20 min in a stream of nitrogen.

Raw ground product with demineralized water gently lifted into a coagulator Condux LV15 15/N3; the mixture was collected on the filter is stainless steel. Product 4 times washed with 5 liters of demineralized water was collected in a glass beaker with a volume of 2 liters and was dried under vacuum at 80°C for 24 h to obtain a product with a relative viscosity 5,49.

The stitching

Approximately 1 g of the specified product was subjected to heat treatment under vacuum at 200°C for 0.5 h (oven Büchi TO-51).

The mixture 257,4 mg heat-treated product with 147,64 g H2SO4remained turbid, while the product is not heat-treated, were completely dissolved in sulfuric acid to obtain a clear solution.

Control example

The procedure according to Example 1 was repeated without the use of 1,4-VBOs. The mixture is heat-treated and not heat treated products were completely dissolved in sulfuric acid to obtain a clear solution.

Example 2

Into a clean dry flask with a volume of 2 l, equipped with a mechanical stirrer, input and output of nitrogen and outlet for vacuum, download, accurately weighed quantity of PPD (20,715 or 18,164 g), DABA (3,247 or 6,409 g) and 400 ml of dry NMP/CaCl2. The reaction the vessel was twice purified nitrogen; the mixture was stirred 30 min at 150 rpm with the aim of dissolving the amines.

The flask was cooled to 10°With a mixture of ice and water. After removal of the cooling medium stirring speed was set equal to 320 rpm and introduced through the funnel into the flask accurately weighed quantity of TDC (43,222 or 42,622 g). The funnel is washed twice with 25 ml of dry NMP/CaCl2. The flask was closed and left the mixture to react for 20 min in a stream of nitrogen.

Milled product with demineralized water gently lifted into a coagulator Condux LV15 15/N3; the mixture was collected on the filter is stainless steel. Product 4 times washed with 5 liters of demineralized water was collected in a glass beaker with a volume of 2 liters and was dried under vacuum at 80°C for 24 h to obtain a product with a relative viscosity 6,10 and 3.70, respectively.

A product with a relative viscosity 6,10 (836,94 mg) together with PVP (41.3 mg, MM 1,3*106) formula:

was dissolved in 148,03 g of sulfuric acid. Clear solution is precipitated with water, filtered off, washed and left to dry under vacuum at 80°C overnight.

The stitching

Approximately 1 g of this composition was subjected to heat treatment under vacuum at 300°C for 0.5 h (oven Büchi TO-51) to obtain the product that remained turbid, whereas the original product, not heat-treated, were completely dissolved in sulfuric acid is obtaining a clear solution.

Example 3

Into a clean dry flask with a volume of 2 l, equipped with a mechanical stirrer, input and output of nitrogen and outlet for vacuum, downloaded 17,253 g PPD, 6,087 g DHB and 400 ml of dry NMP/CaCl2. The reaction vessel was twice purged with nitrogen, and the mixture was stirred 30 min at 150 rpm with the aim of dissolving the amines.

The flask was cooled to 10°With a mixture of ice and water. After removal of the cooling medium stirring speed was set equal to 320 rpm and introduced through the funnel into the flask accurately weighed quantity of TDC (38,186 g). The funnel is washed twice with 25 ml of dry NMP/CaCl2. The flask was closed and left the mixture to react for 20 min in a stream of nitrogen.

Milled product with demineralized water gently lifted into a coagulator Condux LV15 15/N3; the mixture was collected on the filter is stainless steel. Product 4 times washed with 5 liters of demineralized water was collected in a glass beaker with a volume of 2 liters and was dried under vacuum at 80°C for 24 h to obtain a product with a relative viscosity 6,40.

Accurately weighed quantity of this product, 304 or equal to 300 mg, together with 306,8 mg of the product obtained in example 2, with the characteristic viscosity 6,10 or 307 mg of the product obtained in example 2, with the characteristic viscosity 3,70 was dissolved in 100 ml of sulfuric acid. The mixture was introduced into the water through the spray was filtered, washed and left sushi is sterile under vacuum at 80°C overnight.

The stitching

Approximately 1 g of each of these two compositions were subjected to heat treatment under vacuum at 380°C for 5 min (oven Heraeus MR170). Custom made products are not completely dissolved in sulfuric acid, while unstitched - complete.

Example 4

Into a clean dry flask with a volume of 2 l, equipped with a mechanical stirrer, input and output of nitrogen and outlet for vacuum, downloaded 25,5696 g DABA, 4,5469 g DHB and 400 ml of dry NMP/CaCl2. The reaction vessel was twice purged with nitrogen, and the mixture was stirred 30 min at 150 rpm with the aim of dissolving the amines.

The flask was cooled to 10°With a mixture of ice and water. After removal of the cooling medium stirring speed was set equal to 320 rpm and introduced through the funnel into the flask accurately weighed quantity of TDC (30,2483 g). The funnel is washed twice with 25 ml of dry NMP/CaCl2. The flask was closed and left the mixture to react for 20 min in a stream of nitrogen.

Milled product with demineralized water gently lifted into a coagulator Condux LV15 15/N3; the mixture was collected on the filter is stainless steel. Product 4 times washed with 5 liters of demineralized water was collected in a glass beaker with a volume of 2 liters and was dried under vacuum at 80°C for 24 h to obtain a product with a relative viscosity of 1.8.

The stitching

Approximately 1 g of the product obtained as described above were subjected to heat treatment under WAC the mind at 300°C for 15 min (oven Búchi B580). IR analysis (Biorad FTS 576, equipped with a module Thunderdome Swap-top, ATR, crystal Germany) showed the presence of absorption bands of ester (1740 cm-1), which indicates that the binding chains by the reaction between the COOH group and the IT group.

Example 5

Into a clean dry flask with a volume of 2 l, equipped with a mechanical stirrer, input and output of nitrogen and outlet for vacuum, downloaded 16,0481 g PPD, 7,3112 g DAP.2HCl, 6,001 g of pyridine and 400 ml of dry NMP/CaCl2with the concentration of CaCl2equal 10,06 wt.%. The reaction vessel was twice purged with nitrogen, and the mixture was stirred 40 min at 150 rpm with the aim of dissolving the amines.

The flask was cooled to 10°With a mixture of ice and water. After removal of the cooling medium stirring speed was set equal to 320 rpm and introduced through the funnel into the flask accurately weighed quantity of TDC (37,6610 g). The funnel is washed twice with 25 ml of dry NMP/CaCl2. The flask was closed and left the mixture to react for 20 min in a stream of nitrogen.

Milled product with demineralized water gently lifted into a coagulator Condux LV15 15/N3; the mixture was collected on the filter is stainless steel. Product 4 times washed with 5 liters of demineralized water was collected in a glass beaker with a volume of 2 liters and was dried under vacuum at 80°C for 24 h to obtain a product with a relative viscosity 5,12.

The stitching

The product was subjected to heat treatment under WAC the mind at each combination of temperature values (250, 300, 350 and 400°C) and time (2, 3, 5 and 10 min) in the oven Heraeus MR170. The sample for each of the sixteen combinations contained approximately 1 g of the product. Custom made products are not dissolved in sulfuric acid, while unstitched were subjected to dissolution.

Reference example 6

The previous example 5 was repeated without the use of PAK. The samples subjected to the stitching at 250°C or 300°C for 10 min, remained completely soluble.

Example 7

Into a clean dry flask with a volume of 2 l, equipped with a mechanical stirrer, input and output of nitrogen and outlet for vacuum, downloaded 16,4263 g PPD, 8,0911 g DAH.2HCl, 0,975 g PAK and 400 ml of dry NMP/CaCl2with the concentration of CaCl2equal 10,24 wt.%. The reaction vessel was twice purged with nitrogen, and the mixture was stirred 40 min at 150 rpm with the aim of dissolving the amines.

The flask was cooled to 10°With a mixture of ice and water. After removal of the cooling medium stirring speed was set equal to 320 rpm and introduced through the funnel into the flask 38,5493 g TDC.

The funnel is washed twice with 25 ml of dry NMP/CaCl2. The flask was closed and left the mixture to react for 45 min in a stream of nitrogen.

The product together with demineralized water gently lifted into a coagulator Condux LV15 15/N3; the mixture was collected on the filter is stainless steel. Product 4 times washed with 5 liters of demineralized water was collected in a glass beaker with a volume of 2 liters and was dried under vacuum at 80°C for 24 h with the product, having a relative viscosity to 2.29.

The stitching

The product was subjected to heat treatment under vacuum at each combination of temperature values (250, 300, 350 and 400°C) and time (2, 3, 5 and 10 min) in the oven Heraeus MR170. The sample for each of the sixteen combinations contained approximately 1 g of the product. Samples treated at 250°C for at least 5 min or heated up to 300°C, was dissolved in sulfuric acid, while unstitched were subjected to dissolution.

Reference example 8

The previous example 7 was repeated without the use of PAK. The samples subjected to the stitching at 250°C or 300°C for 10 min, remained completely soluble.

Example 9

The dried reactor company Drais volume of 10 l was filled 175,5 g PPD, 88,10 g DHB, 10.8 g PAK and 4 l of NMP/CaCl2when concentrations CaCl2equal 11,13 wt.%. The solution was cooled to 4°C and was added 413,87 g TDC. After you add TDC polycondensation reaction was continued 31 minutes

Milled product with demineralized water gently lifted into a coagulator Condux LV15 15/N3; the mixture was collected on the filter is stainless steel. Product 8 times washed with 5 liters of demineralized water was collected in a glass beaker with a volume of 2 liters and was dried under vacuum at 80°C for 48 h to obtain a product with a relative viscosity of 4.4.

The stitching

The product was subjected to heat treatment under vacuum at each op is Tania's story temperatures (250, 300, 350 and 400°C) and time (2, 3, 5 and 10 min) in the oven Heraeus MR170. The sample for each of the sixteen combinations contained approximately 1 g of the product. Samples treated at 200°C for 10 min and at 250°C for 5 min, only swollen; samples processed in the range between 250°C for 10 min and 300°C for 10 min, remained in sulfuric acid unchanged.

1. Stitched aramid copolymer composition containing aramid copolymer derived from monomers comprising 1,4-phenylenediamine and terephthaloylchloride, which includes at least one link arylenecarborane acid and at least one hydroxyechinenone link, or containing aramid copolymer derived from monomers comprising 1,4-phenylenediamine and terephthaloylchloride, which includes at least one link arylenecarborane acid or at least one hydroxyechinenone link, and covalent crosslinking agent.

2. Stitched aramid copolymer composition according to claim 1, wherein such composition comprises aramid copolymer, which includes at least one link arylenecarborane acid, and a crosslinking agent.

3. Stitched aramid copolymer composition according to claim 2, characterized in that the crosslinking agent is selected among aramid copolymers, composed by men who her least two aromatic hydroxyl groups of polyvinyl alcohol and an aromatic monomers containing hydroxyl groups.

4. Stitched aramid copolymer composition according to claim 1, characterized in that the link arylenecarborane acid is a link phenylenecarbonyl acid, and the fact that hydroxyechinenone link is hydroxyphenylazo link.

5. Stitched aramid copolymer composition according to claim 1, wherein the aramid copolymer, which includes a link arylenecarborane acid and hydroxyechinenone link is a copolymer, comprising at least the links are formed from 1,4-diaminobenzene, 1,4-benzotiadiazina, 3,3'-dioxybenzene and 2.5-diaminobenzoic acid, so that the aramid copolymer, which includes at least one link arylenecarborane acid is a copolymer, comprising at least the links are formed from 1,4-diaminobenzene, 1,4-benzotiadiazina and 2.5-diaminobenzoic acid, and the fact that the crosslinking agent is selected among PVA, PVP and VBOs.

6. Stitched aramid copolymer composition according to claim 5, wherein the aramid copolymer is a copolymer in which 1 to 20% of the links are formed from 2,5-diaminobenzoic acid.

7. Link aramid is th copolymer composition according to claim 1, characterized in that it contains aramid copolymer, which includes at least one hydroxyechinenone link, and a crosslinking agent.

8. Stitched aramid copolymer composition according to claim 7, characterized in that the crosslinking agent is selected from a polymer containing at least two carboxyl groups, such as polyacrylic acid.

9. Crosslinked aramid copolymer obtained by crosslinking aramid copolymer composition according to any one of claims 1 to 8.

10. A method of obtaining a crosslinked aramid copolymer according to claim 9, comprising the crosslinking composition of aramid copolymer derived from monomers comprising 1,4-phenylenediamine and terephthaloylchloride, which includes at least one link arylenecarborane acid and at least one hydroxyechinenone link, or crosslinking of the composition aramid copolymer derived from monomers comprising 1,4-phenylenediamine and terephthaloylchloride, which includes at least one link arylenecarborane acid or aramid copolymer, which includes at least one hydroxyechinenone link, in the presence of covalent cross-linking agent.

11. The spinning solution containing the stitching aramid copolymer composition according to any one of claims 1 to 8 in sulphuric acid.

12. Molded product, steriade the crosslinked aramid copolymer according to claim 9.

13. Molded product according to item 12, characterized in that it is a fiber, film or sheet.

14. Method of making molded articles comprising forming stitched aramid copolymerizes composition according to any one of claims 1 to 8 in the form of subsequent stitching molded workpiece in a molded product.

15. The method according to 14, wherein forming the stitching aramid copolymer composition is accomplished by spinning or casting.



 

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FIELD: chemistry.

SUBSTANCE: present invention pertains to versions of polyamide resin in form of granules, to composition of polyamide resin, moulded objects, versions of articulated moulded objects, binding band, and unit thread. In the first version, polyamide resin contains components of dicarboxylic acid o links, containing adipinic acid links, and components of diamine links, containing pentamethylenediamine links and hexamethylenediamine links. Mass ratio the number of pentamethylenediamine links to the number of hexamethylenediamine links lies between 95:5 and 5:95. Pentamethylenediamine links are formed from pentamethylenediamine, obtained from lysine using lysine decarboxylase, capable of producing lysine decarboxylase cells, or a product of converting such cells. In the second version, polyamide resin contains components of diamine links, with mass ratio of the number of pentamethylenediamine links to the number of hexamethylenediamine links lying between 95:5 and 60:40. The polyamide resin composition essentially consists of the above mentioned polyamide resin and inorganic filling material. Content of inorganic filling material ranges from 0.01 to 150 mass units, per 100 mass units of polyamide resin. From polyamide resin or composition of polyamide resin, a moulded object is obtained using vibration welding, or an articulated object, or a binding band, or a unit thread. The articulated moulded object can also be made from polyamide resin, consisting of adipinic acid links and pentamethylenediamine links.

EFFECT: obtaining a polyamide resin with high thermal stability, a moulded object, with high vibration welding strength, an articulated moulded object and a binding bans, with good low-temperature strength, a unit thread, with good transparency.

20 cl, 6 tbl, 6 ex, 8 dwg

The invention relates to the technology of poly-n-phenyleneterephthalamide (PPTA) - aromatic polyamide and copolymers used in the manufacture of high strength, high modulus fibers

Molded product // 2017866
The invention relates to the technology of molded products such as fibers, filaments, films, foils of aromatic copolyamids n structures with high mechanical properties and is used for reinforcing plastics, rubber products, as tire cord and technical materials for filtering and isolation

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing completely para-substituted aromatic polyamide particles for use as filler, which comprises the following steps: a) adding an aramide polymer solution to a water-based coagulation liquid to obtain a hydrogen-containing moulded product and b) crushing the frozen non-dried or partially dried moulded product, having water content from 10 to 99 wt %.

EFFECT: method enables simple and efficient production of small aromatic polyamide particles which cannot be obtained through traditional grinding methods.

8 cl, 1 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: composition contains a mixture of polyamide, where the ratio of terminal amino groups in the terminal carboxyl groups of the polyamide polymer is less than 0.2, polyester which is capable of crystallising and an interfacial tension reducing agent.

EFFECT: composition enables to obtain dispersed particles with average size of less than 200 nm when stretched, good colour composition which will not exhibit high increase in turbidity with increase in the amount of dispersed material, or has acceptable turbidity during production, and has good colour, especially in the absence of cobalt.

7 cl, 3 tbl, 18 ex, 8 dwg

FIELD: machine building.

SUBSTANCE: procedure consists in condensing polyamide moulding blend, polyamide of which has at least 30 % of end groups in form of end amino-groups of polycarbonate with 0.005 to 10 wt % in terms of used polyamide. At stage a) there is prepared polyamide moulding blend, b) there is produced mixture of polyamide moulding blend and polycarbonate, c) if necessary, blend is stored and/or transported by point b) and d) mixture is processed by point b) into a moulded item. The item corresponds to a hollow item or hollow profile with external diametre at least 30 mm and thickness of wall at least 1 mm. Condensing occurs only at stage of processing.

EFFECT: increased stiffness of melt at simultaneous reduced pressure during processing and insignificant load on engine, simplification of moulded items production.

6 cl, 1 ex, 2 tbl

Polymer composition // 2383569

FIELD: chemistry.

SUBSTANCE: according to the invention, the polymer composition is an aromatic polyamide C-2 phenylone and ultradisperse filler. The ultradisperse filler used is multilayered Taunit carbon nanotubes. Components are in the following ratio: multilayered nanotubes - 3-10%, C-2 phenylone - 90-97%.

EFFECT: polymer composition has improved physical and mechanical and antifriction properties.

FIELD: chemistry.

SUBSTANCE: invention can be used for making friction bearings, seals, gear wheels and other structural components of machines and mechanisms. The polymer composition contains 35 to 45 wt % thermoreactive resin - phenolformaldehyde or epoxy resin and 55 to 65 wt % granulated para-aramid fibre Rusar-S. This increases compression strength of the composition by 11 to 12%, impact strength by 1.54 to 1.6 times, and reduces anisotropy factor by 1.14 to 1.3 times.

EFFECT: design of an efficient method of producing polymer compositions based on thermoreactive binder and fibre filler.

1 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: invention concerns asbestos-free polymer friction compositions and can be applied in production of brake shoes. Composition includes, wt %: linking agent out of high-molecular unsaturated hydrocarbon rubbers 19-24; mineral fillers of concentrated barite 18-25 and alumina 6-8; asbestos-free fibrous filler of kevlar pulp 1.5-3.0, arselon pulp 1.5-3.0, and wollastonite 2-5; carbon fillers of Carbon black 6.95-15.0, and graphite 24-30; curing group of sulphur 1-3, 2-mercaptobenzothiazol 0.5-0.9, and thiuram 0.03-0.15.

EFFECT: enhanced durability, friction rate stability of products manufactured on the basis of claimed composition, reduced product cost and emission of hazardous substances to environment.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention concerns composite materials used in manufacturing of antifriction parts for friction units in automotive industry, e.g. of ball joint pads. Polymer material for "Lyugam" friction units contains, mass %: polyamide-6 34-70, high-pressure polyethylene 10-16, fiber carbon filler 12-35, and oil additive 7-15. The other is a composition based on a mineral oil, surfactants, functional additives and crushed crystal graphite.

EFFECT: improved performance characteristic of the material due to higher elasticity enabling better durability against impact loading, and to lower friction factor.

1 ex

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