The method of obtaining expanded onto a silicone compositions

 

(57) Abstract:

Use: for the production of elastomeric foams with improved radiation resistance. The inventive composition comprises organopolysiloxane block copolymers with a content of Oh-groups from 0.2 to 4.0 wt. % polyorganosiloxane with the content of SiH groups of 0.35 -1,8 wt.%, 2 to 15 wt.h., modifier - organosilicon amine or inorganic compound of cobalt containing 34 wt.% cobalt - 2 - 22 wt.h. 4 C.p. f-crystals, 1 table.

The invention relates to chemical technology, in particular a process for the production of organosilicon compositions, expanded onto due to the gases released during the chemical reactions of the mixture components, and can be used for the production of elastomeric foams with improved radiation resistance.

Known methods for producing expanded onto a silicone compositions [1].

In the known methods are expanded onto a silicone composition obtained by mixing polymer base, which apply"", "" dihydroxyphenylethylamine and foaming agents.

Obtained in a known manner organosilicon compositions otverzhdajutsja PR is tx2">

Known methods for producing heat-resistant durable elastomeric materials based on block copolymers of linear-stair structure [2].

However, the prior art does not contain data about the use of block copolymers of linear-stair structure as the polymer base expanded onto a silicone compositions.

Closest to the present invention is a method of obtaining expanded onto a silicone compositions, comprising mixing organosiloxane rubber, silicone cross-linking agent and modifier [3].

In the known method as organosiloxane rubber used minilateral polyorganosiloxane, as cross-linking agent - polyorganosiloxane with the content of SiH groups of 0.3-1.6% and as a modifier - compounds containing hydroxyl groups.

There is a method allows to obtain expanded onto a silicone composition with improved strength properties. However, the materials obtained in a known manner, have a high rate of gas evolution under radiation exposure.

The objective of the invention is to provide a method for manufacturing a light and durable cremniter invention is to reduce radiation gassing expanded onto a silicone compositions obtained by mixing organosiloxane rubber, silicone cross-linking agent and a modifier.

The technical result is achieved in that in a method of producing expanded onto a silicone compositions, comprising mixing organosiloxane rubber, silicone cross-linking agent and modifier, according to the invention as organosiloxane rubber used organopolysiloxane block copolymers of General formula

{[R1SiO1,5]a[R2(OH)SiO]b, [R3R4SiO]c}n,

with a content of OH groups from 0.2 to 4.0 wt.% and mol.% the relation R3R4SiO units, R1SiO1,50,850 - 10,000, respectively, where R1, R2,R3, R4- aliphatic, radicals with 1-6 carbon atoms, phenyl, n is an integer from 30 to 360, c=1, a=0,019-3,760, b=0,008-0,240 or a mixture of the specified blockcopolymer with - dihydroxyphenylethylamine with a viscosity at 20oC 24 P 160 P wt.h. the ratio of 0.05-0.5):1, respectively,

as the organosilicon cross-linking agent used polyorganosiloxane General formula

R53SiO[R6(H)SiO]m-[R52SiO]nSiR53,

with the AMI carbon m is an integer from 1 to 20, n is an integer from 0 to 19, m+n=20, or at least one of the compounds of General formula

R7SiX3,

where

R7is an alkyl radical with 1-6 carbon atoms, CH2=CH-, X:-ON=C(CH3)2, -OC(O)-CH3,

and as a modifier use the organosilicon amines of General formula

R8R9N-(CH2)n-Si(OR10)3,

where R8=R9=H, CH3- C2H5-, R10=CH3- C2H5-, n is an integer from 0 to 3, or a mixture of sodium bicarbonate with zinc oxide or inorganic compound of cobalt containing 34 wt.% cobalt, and the above components are taken in the following ratio to 100 wt.h. organosiloxane rubber 2-15 wt.h. organosilicon cross-linking agent and 2-22 wt.h. a modifier.

Possible variants of implementation of the method in which it is advisable to

in the composition additionally injected from 0.3 to 1.5 wt.h. determinability tin;

in the composition additionally injected from 5 to 150 wt.h. filler;

as the filler used at least one substance selected from the group: chalk, white carbon black, Aerosil, titanium dioxide;

as filler they intended, consisting in the implementation of the conditions, allowing the use of block copolymers of linear-stair structures in obtaining expanded onto a radiation-resistant silicone compositions. The block copolymers are linear stair organosiloxanes used either as a polymer base, or as an additive to the linear polyorganosiloxane.

The process of foaming and curing of the composition on all options occurs when the ambient temperature. The time of foaming and the formation of surface film is from 1.0 to 40 minutes Full cure of the foam takes no more than 48 hours

Obtaining expanded onto the silicone compositions according to the present method is as follows.

When used in this way polyorganosiloxanes with terminal silanol groups, a crosslinking agent type RSiX3in particular methyltris(acetoxy)silane and modifier in the form of a mixture of sodium bicarbonate and zinc oxide, the process of foaming and hardening caused by the following factors.

As a result of partial interaction between the silanol groups of the polymer and acetochlor cross-linking agent is allocated acetic acid is the song. The decomposition is catalyzed by the zinc oxide.

Achieving the necessary speed of curing of the composition is provided by the introduction of the curing agent in the form of determinability tin. Adding this substance under the action of moisture environment (air) flows through the reversible hydrolysis of determinability tin with the formation of hydroxyl derivative of tin, reacting, in turn, with methyltris(acetoxy)silane with education kremnijorganicheskogo connections and the allocation of additional amounts of acetic acid. The reaction kremnijorganicheskogo connection with other silanol groups of the polymer leads to the formation of the spatial structure of pinealectomy.

When using the method of cross-linking agent in the form of polyorganosiloxane and modifier in the form of inorganic compounds cobalt (containing cobalt 34 wt.%) pedobrazovanie and curing of the compositions due to the following processes.

The interaction of polyorganosiloxane and compounds of cobalt leads to the formation of unstable intermediate complex. Last, reacting with silanol groups of the polymer, razrushaete in the node joining. This foaming (allocation of CO2) and the formation of spatial patterns occur almost simultaneously.

When using the combination of: a crosslinking agent - polyorganosiloxane (or their mixture) and a modifier in the form of organosilicon amines (or their mixture) the process of foaming the composition is as follows.

In the result of the interaction of silanol groups of rubber and hydride groups of the crosslinking agent is allocated H2. At the same time there is the interaction of hydride groups belonging to different molecules polyorganosiloxanes, also accompanied by release of H2.

The addition of organosilicon amines intensifies the process of foam formation due to the interaction of hydride groups belonging to different molecules polyorganosiloxanes.

Introduction to the composition of determinability tin catalyzes the interaction of silanol and hydride groups, leading to the formation of the spatial structure of pinealectomy.

When using a combination of cross-linking agents in the form of at least one compound from the compounds with the General formula RSiX3and modifier in the form of neorganics/P> As a result of partial interaction between the silanol groups of the rubber and acetoxy or acetogenic groups linking agent is allocated acetic acid or acetoxy. Inorganic compound of cobalt with a pronounced basic character, is decomposed under the action of acetic acid or acetoxy emitting CO2.

Next, the process of crosslinking of the polymer is similar to the above process using a mixture of sodium bicarbonate and zinc oxide.

The features and advantages of the invention will become clear in the subsequent consideration of the above examples of the invention and the data of the radiation tests. The content of the components is given in wt.h.

Example 1. In accordance with the methods are analogous composition is prepared in the mixer type mechanical mortar mix for about 50-60 min 100 h-dihydroxyphenylalanine General formula

H[OSi(CH3)2]nOH,

with a viscosity of 160 N at 20oC (M=35000), 20 hours of polydimethylsiloxane with silanol groups and a viscosity of 80 CPS (at 20oC and 10 h of polymethylhydrosiloxane with integral trimethylsilylpropyne (viscosity at 20oC 0,2 N).

In the mixture injected 4 hours of octoate tin and TRANS is in.

Example 2. In accordance with the method of the closest analogue to the method described in example 1, a composition is prepared by mixing 100 hours minilateral of polyorganosiloxane formula

(CH2=CH)3SiO[Si(CH3)2O]aSi(CH=CH2)3,

with a viscosity at 25oC 200 P, 10 hours of polyorganosiloxane containing 2 SiH groups, with a viscosity at 25oC 0,1 N, 50 hours of oligoanalgesia branched structure of General formula

{[(CH3)3SiO0,5]a[SiO2]b}n,

where n=8-10, the ratio of [(CH3)3SiO0,5] and [SiO2] links of 0.85, respectively, M oligomerisation= 2000, the oligomer contains 1,8-2,0% C2H5O-group and 1.7%-OH groups, 0,2 including water, etc. OH-containing compounds.

As the mixture is injected 0,01 including 2%-aqueous solution of H2PtCl6and mix for 3-4 minutes

The resulting composition foams for 10 minutes and cures at room temperature within 24 hours

Example 3. According to the method described in example 1, a composition is prepared by mixing 100 hours, dihydroxyphenylalanine with a viscosity at 20oC 24 N (M= 5300), 10 am, zinc oxide, 10 g sodium bicarbonate.

In poluce minutes To the resulting mass is added to 0.8 g determinability tin and mix composition for 1 - 2 minutes

The composition foams and hardens in the air within 10 minutes

Example 4. According to the method similar to example 1, a composition is prepared by mixing 100 hours, dihydroxyphenylalanine with a viscosity at 20oC 160 P, 8 o'clock white black, 5 hours Aerosil, 5 o'clock sodium bicarbonate, 10 am, zinc oxide. In the mixture injected 3 hours methyltris- (acetoxy)silane of the formula CH3Si(OC(O)CH3)3, stirred for 1 to 2 minutes To the resulting mass is added to 0.8 g determinability tin and even mix composition for 1 - 2 minutes

The composition foams and hardens in the air within 20 minutes

Example 5. According to the method described in example 1, a composition is prepared by mixing 100 hours, dihydroxyphenylalanine with a viscosity at 20oC 160 P (M = 35000), 100 hours of chalk, 50 hours of oligosaccaride branched structure, the General formula

{[(CH3)3SiO0,5]a[SiO2]b},

where

n = 10, the ratio of [(CH3)3SiO0,5] and [SiO2] links is 0.95, respectively.

The oligomer contains 1.8% of C2H5O-group and 1.7% - OH groups.

In the mixture injected 6 hours-aminopropyltriethoxysilane formula H2N-(CH2)3-Si(OC2H5)3and mix part 3 - 4 minutes To the resulting mass is added to 0.9 g determinability tin and even mix composition for 1 - 2 minutes

The composition foams for 25 minutes and hardens in the air within 24 hours

Example 6. According to the method described in example 1, a composition is prepared by mixing 100 hours, dihydroxyphenylalanine with a viscosity at 20oC 160 P (M = 35000), 100 hours of chalk, 50 hours of organopolysiloxane block copolymer having links

(R1SiO1,5), R2(OH)SiO, R3R4SiO,

the General formula

{[CH6H5SiO1,5]a[C6H5(OH)SiO]b[(CH3)2SiO]c}n< / BR>
where

R1= R2= C6H5-, R3= R4= CH3- with a content of OH groups of 2.7% and a viscosity at 20oC 12,6 P.

5 hours of polyorganosiloxane with a viscosity at 20oC 0,15 N formula

(CH3)3SiO[CH3(H)SiO]m[(CH3)2SiO]nSi(CH3)3,

where

m = 7, n = 13.

In the resulting2H5)3,

the composition is stirred for 3 to 4 minutes

To the resulting mass is added to 0.6 g determinability tin and even mix composition for 1 - 2 minutes

The composition foams for 25 minutes and hardens in the air within 24 hours

Example 7. According to the method described in example 1, a composition is prepared by mixing 100 hours, dihydroxyphenylalanine with a viscosity at 20oC 160 P (M = 35000), 100 hours of chalk, 50 hours of organopolysiloxane block copolymer with the above General formula having links

(R1SiO1,5), R2(OH)SiO, R3R4SiO,

where

a = 0,3; b = 0,05; c = 1; n = 70;

R1= R2= C6H5-, R3= R4= CH3-with a content of OH groups of 2.7% and a viscosity at 20oC 12,6 P.

10 o'clock sodium bicarbonate and 10 o'clock zinc oxide.

In the mixture injected 5 hours methyltris(acetoxy)silane of the formula:

CH3Si(OC(O)CH3)3< / BR>
the composition is stirred for 3 to 4 minutes

To the resulting mass is added to 0.6 g determinability tin and even mix composition for 1 - 2 minutes

The composition foams for 25 minutes and hardens in the air within 24 hours

Example 8. Composition preparing Ulai, having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,360 - 0.800 to; b = being 0.036 - 0,064; c = 1; n = 100 - 250; R1= R2= C6H5-, R3= R4= CH3-with different ratios of links(3) : (1) = 0,80 - 2,600 accordingly, different content of OH groups of 0.30 - of 3.77% and various characteristic viscosity of 0.15 to 0.6 DL/g

The block copolymers used in the form of 45 - 60% solutions in toluene, esters or other aromatic solvents, the calculation of all components of the composition is 100 hours of dry block copolymer,

100 hours of titanium dioxide,

10 hours of polyorganosiloxane with a viscosity at 20oC 0,2 N General formula

(CH3)3SiO [(C2H5(H)SiO]mSi (CH3)3< / BR>
where

m = 20, n = 0.

In the mixture injected 3 h-aminopropyltriethoxysilane formula

H2N - (CH2)3- Si(OC2H5)3,

the composition is stirred for 3 to 4 minutes

To the resulting mass is added to 0.9 g determinability tin and even mix composition for 1 - 2 minutes

The composition foams for 20 minutes and hardens in the air within 24 hours

Example 9. The composition is prepared plumage links:

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,360 - 0.800 to; b = being 0.036 - 0,064; c = 1; n = 100 - 250; R1= R2= C6H5-, R3= R4= CH3-with different ratios of links(3) : (1) = 0,80 - 2,600 accordingly, different content of OH groups of 0.30 - of 3.77% and various characteristic viscosity of 0.15 to 0.6 DL/g

The block copolymers used in the form of 45 - 60% solutions in toluene, esters or other aromatic, the calculation of all components of the composition to 100 hours of dry block copolymer.

100 hours of titanium dioxide,

10 o'clock sodium bicarbonate and 10 o'clock zinc oxide.

In the mixture injected 4 h methyltris(acetoxy)silane of the General formula: CH3Si(OC(O)CH3)3the composition is stirred for 3 to 4 minutes

To the resulting mass is added to 0.9 g determinability tin and even mix composition for 1 - 2 minutes

The composition foams for 20 minutes and hardens in the air within 24 hours

Example 10. According to the method described in example 1, a composition is prepared by mixing 100 including a block copolymer with the above General formula having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,175 at 0.42; b correlation links(3) : (1) = 2,300 - 3,2800 accordingly, different content of OH groups of 0.25 - 0,86% and various characteristic viscosity of 0.2 to 0.4 DL/g

The block copolymers used in the form of 50 - 60% solutions in toluene, esters or other solvents, the calculation of all components of the composition is 100 hours of dry block copolymer,

150 hours of chalk, 10 hours of polyorganosiloxane with a viscosity at 20oC 0,15 N General formula

(CH3)3SiO[CH3(H)SiO]mSiO]m- Si(CH3)3< / BR>
where

m = 20, n = 0.

In the mixture injected 3 h-aminopropyltriethoxysilane General formula

H2N - (CH2)3- Si(OC2H5)3,

the composition is stirred for 3 to 4 minutes

To the resulting mass is added to 0.8 g determinability tin and even mix composition for 1 - 2 minutes

The composition foams for 25 minutes and hardens in the air within 24 hours

Example 11. According to the method described in example 1, a composition is prepared by mixing 100 including a block copolymer of the above General formula having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,170 is 0.260; b = to 0.060 - 0,080; c = 1; n = 50 - 60; R1= R2= C6H5-, R3 the content of OH groups of 0.25 - 0,86% and various characteristic viscosity of 0.2 to 0.4 DL/g

The block copolymers used in the form of 50 - 60% solutions in toluene, esters or other aromatic solvents, the calculation of all components of the composition is 100 hours of dry block copolymer,

150 hours of chalk, 10 am, zinc oxide, 10 g sodium bicarbonate.

In the mixture injected 2 hours methyltris(acetoxy)silane of General formula

CH3Si(OC(O)CH3)3,

the composition is stirred for 3 to 4 minutes

To the resulting mass is added to 0.8 g determinability tin and even mix composition for 1 - 2 minutes

The composition foams for 25 minutes and hardens in the air within 24 hours

Example 12. According to the method described in example 1, a composition is prepared by mixing 100 hours reorganisational block copolymer with the above General formula having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,200; b = 0,086; c = 1; n = 70; R1= R2= C6H5-, R3= R4= CH3- with a content of OH groups of 2.7% and a viscosity of 11.5 P,

150 hours of chalk, 10 hours of polyorganosiloxane with a viscosity at 20oC 0,15 N General formula

(CH3)3SiO[CH2(CO)8with the binder content of 34 wt.% and mix composition for 1 - 2 minutes

The composition foams for 25 minutes and hardens in the air within 24 hours

Example 13. According to the method described in example 1, a composition is prepared by mixing 100 hours of organopolysiloxane block copolymer with the above General formula having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where a = 0,200; b = 0,086; c = 1; n = 70; R1= R2= C6H5-, R3= R4= CH3- with a content of OH groups of 2.7% and a viscosity of 11.5 P,

150 hours of chalk, 2 hours methyltris(acetoxyl)silane of General formula

(CH3)Si(ON = C(CH3)2)3.

As the mixture is injected 12 h of inorganic compounds cobalt Co2(CO)8with the binder content of 34 wt.% and mix composition for 1 - 2 minutes

The composition foams for 25 minutes and hardens in the air within 24 hours

Example 14. According to the method described in example 1, a composition is prepared by mixing 100 hours of organopolysiloxane block copolymer with the above General formula having links

(R1SiO1,5) (1), R2(O/SUP> = CH3- with a content of OH groups 3% and with a viscosity of 13.0 P,

150 hours of chalk, 10 hours of polyorganosiloxane with a viscosity at 20oC 0,2 N General formula

(CH3)3SiO [(C2H5(H)SiO]m- [(CH3)2SiO]nSi(CH3)3,

where m = 6, n = 14.

As the mixture is injected 12 h of inorganic compounds cobalt Co(NO)(CO)3containing cobalt or 33.7 wt.% and mix composition for 1 - 2 minutes

The composition foams for 30 minutes and hardens in the air for no more than 48 hours

Example 15. According to the method described in example 1, a composition is prepared by mixing 100 hours of organopolysiloxane block copolymer of the above General formula having links:

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where a = 0,20; b = 0,086 l; c = 1; n = 70; R1= R2= C6H5-, R3= R4= CH3- with a content of OH groups 3% and a viscosity of 13.0 P,

150 hours of chalk, 2 hours vinyltris(acetoxyl)silane of General formula

CH2= CHSi(ON = C(CH3)2)3.

As the mixture is injected 12 h of inorganic compounds cobalt [Co(NH3)6] [Co(CO)4)] 2containing cobalt 34.8 wt.% and mix composition in AE 48 hours

Example 16. According to the method described in example 1, a composition is prepared by mixing 100 hours of organopolysiloxane block copolymer of the above General formula having links:

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where a = 0,20; b = 0,086 l; c = 1; n = 70; R1= R2= C6H5-, R3= R4= CH3- with a content of OH groups of 2.7% and a viscosity at 20oC 10,0 P,

100 hours of chalk, 10 hours of polyorganosiloxane with a viscosity at 20oC 0,15 N General formula

(CH3)3SiO[CH3(H)SiO]m- [(CH3)2SiO]nSi(CH3)3,

where m = 7, n = 13.

In the mixture injected 20 hours inorganic compounds cobalt Co2(CO)8with the binder content of 34 wt.% and mix composition for 1 - 2 minutes

The composition foams for 15-18 minutes and hardens in the air within 24 hours

Example 17. According to the method described in example 1, a composition is prepared by mixing 100 hours of organopolysiloxane block copolymer with the above General formula having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,20; b = 0,086; c = 1; n = 70; R1= R2= CH6H5-, R3= R4= CH3 is a General formula

CH3Si(ON = C(CH3)2)3, 0.8 h-aminopropyltriethoxysilane General formula

H2N - (CH2)3- Si(OC2H5)3.

In the mixture injected 20 hours inorganic compounds cobalt Co(NO)(CO)3containing cobalt or 33.7 wt.% and mix composition for 1 - 2 minutes

The composition foams for 15-18 minutes and hardens in the air within 24 hours

Example 18. According to the method described in example 1, a composition is prepared by mixing 100 hours of organopolysiloxane block copolymer of the above General formula having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,20; b = 0,086; c = 1; n = 70; R1= R2= CH6H5-, R3= R4= CH3- with a content of OH groups of 4% and a viscosity at 20oC 11,0 P,

100 hours of chalk, 50 including glass microspheres, 10 hours of polyorganosiloxane with a viscosity at 20oC 0,15 N General formula

(CH3)3SiO[CH3(H)SiO]m- [(CH3)2SiO]nSi(CH3)3,

where m = 7, n = 13.

As the mixture is injected 12 h of inorganic compounds cobalt Co(NO)(CO)8with the binder content of 34 wt.% and stirred in for 1

Example 19. According to the method described in example 1, a composition is prepared by mixing 100 hours of organopolysiloxane block copolymer of the above General formula having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,20; b = 0,086; c = 1; n = 70; R1= R2= C6H5-, R3= R4= CH3- with a content of OH groups of 4% and a viscosity at 20oC 11,0 P,

100 hours of chalk, 50 including glass microspheres, 2 hours methyltris(acetoxy)-silane of General formula

CH3Si(OC(O)CH3)3.

As the mixture is injected 12 h of inorganic compounds cobalt Co(NO)(CO)3containing cobalt or 33.7 wt.% and stirred for 1 to 2 minutes

The composition foams for 12-15 minutes and hardens in the air within 24 hours

Example 20. According to the method described in example 1, a composition is prepared by mixing 100 hours of organopolysiloxane block copolymer with the above General formula having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,20; b = 0,086; c = 1; n = 70; R1= R2= C6H5-, R3= R4= CH3- with a content of OH groups of 2.7% and a viscosity at 20oC 11,0 P,

50 hours of chalk, 50 hours steklyannyh>SiO[CH3(H)SiO]m- [(CH3)2SiO]nSi(CH3)3,

where

m = 7, n = 13.

In the mixture injected 20 hours inorganic compounds cobalt Co2(CO)8with the binder content of 34 wt.% and stirred for 1 to 2 minutes

The composition foams for 12-15 minutes and hardens in the air within 24 hours

Example 21. According to the method described in example 1, a composition is prepared by mixing 100 hours of organopolysiloxane block copolymer with the above General formula having links

(R1SiO1,5) (1), R2(OH)SiO (2), R3R4SiO (3),

where

a = 0,20; b = 0,086; c = 1; n = 70; R1= R2= C6H5-, R3= R4= CH3- with a content of OH groups of 2.7% and a viscosity at 20oC 11,0 P,

50 hours of chalk, 50 including glass microspheres, 2 hours vinyltris(acetoxyl)silane of General formula

CH2= CHSi(ON = C(CH3)2)3.

In the mixture injected 20 hours inorganic compounds cobalt Co2(CO)8with the binder content of 34 wt.% and stirred for 1 to 2 minutes

The composition foams for 12-15 minutes and hardens in the air within 24 hours

For all pinealectomized was the sample pinealectomy under the action of irradiation for 50, 100 and 150 hours At this dose was 543 P/C. the data Obtained are presented in the table. It should be noted that compositions 1 and 2, presented in examples 1 and 2 were obtained according to the patent [1] and [3] respectively.

As can be seen from the obtained data, the use of the invention as organosiloxane rubbers branched polyorganosiloxanes (either in combination with the linear polysiloxane (compositions 5 to 7), either alone (composition 8-21) allows to considerably increase the radiation resistance of the obtained pinealectomized. For example, when switching from the composition 1-4 obtained in a purely linear polyorganosiloxane, tracks 5 - 7, combining linear and branched polymer structures can significantly (up to 10 times) to reduce the amount of outgassing of the samples (from 0,0909 kg/cm2/g for the composition 1 to 0,0092 kg/cm2/g for the composition N 7) and to almost zero values for compositions 12 and 13 when using block copolymers linear-stair structure.

Most successfully the proposed method can be applied for the production of elastomeric foams with improved radiation resistance.

1 1. The way to obtain in the practical cross-linking agent and modifier, characterized in that as organosiloxane rubber used organopolysiloxane block copolymers of General formula 6 {[R1SiO1,5]a[R2(OH)SiO]in[R3R4SiO] c}n1 with a content of OH groups of 0.2 to 4.0 wt.% and mol.% the relation R3R4SiO units, R1SiO1,50,850 - 10,000, respectively, where R1, R2, R3, R4- aliphatic radicals with 1 to 6 carbon atoms, phenyl; n is an integer from 30 to 360; c = 1; a = 0,019 - 3,760; = 0,008 - 0,240, or a mixture of the specified blockcopolymer with dihydroxyphenylethylamine with a viscosity at 20C 24 - 160 P wt.h. the ratio of 0.05 - 0,0,5): 1, respectively, as the organosilicon cross-linking agent used polyorganosiloxane General formula 6 1 with a content of SiH groups of 0.35 and 1.80 wt.%, mol.m. 50 to 200, where R5, R6is an alkyl radical with 1 to 6 carbon atoms; m is an integer from 1 to 20; n is an integer from 0 to 19; m+n = 20, or at least one of the compounds of General formula 6 R7SiX3, 1 where R7is an alkyl radical with 1 to 6 carbon atoms, CH = CH-; 4 X:-ON=C(CH3)2, -OC(O)-CH3, 1 and modifier use silicon amides of the General formula 6 R8R9N-(CH2)nS5
; 4 n is an integer from 0 to 3, 1, or a mixture of sodium bicarbonate with zinc oxide, or inorganic compound of cobalt containing 34 wt.% cobalt, and the above components are taken in the following ratio to 100 wt.h. organosiloxane rubber: 2 to 15 wt.h. organosilicon cross-linking agent and from 2 to 22 wt.h. a modifier. 2 2. The method according to p. 1, characterized in that the composition further added 0.3 to 1.5 wt.h. determinability tin. 2 3. The method according to p. 1, characterized in that the composition additionally enter 5 to 150 wt.h. the filler. 2 4. The method according to PP.1 and 3, characterized in that the filler used at least one substance selected from the group: chalk, white carbon black, Aerosil, titanium dioxide. 2 5. The method according to PP.1 and 3, characterized in that the filler used glass microspheres.

 

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Silicone oil // 2101308
The invention relates to silicone oils on the basis of oligoanilines used, in particular, as the basis of lubricants, operating in a wide temperature range from -60 to 140oC in various industries

The invention relates to the field of polymer processing, in particular, to obtain compositions for the outer layer of thermo-resistant laminates domestic, technical and special purpose, and can be used in the industry of artificial leather, plastic materials and rubber products

The invention relates to a method of continuous manufacture of silicone mass by hot vulcanization based georgano/poly/siloxanes, which in the world of professionals have the name of the silicone mass, obtained by high-temperature vulcanization (NTU)

The invention relates to compositions for the preparation of foams that can be used in construction, for example, as insulation for roofs, for pipelines for cold and hot water, as a filler panels

The invention relates to a method of processing rubber, vulcanized waste high-molecular siloxane rubbers and can be used to obtain qualitative compositions based on siloxane rubbers with a high content of waste

The invention relates to the field of creation of combustible polymeric materials for electronic products and household appliances, in particular for products of TV equipment

The invention relates to hydraulic fluids for hydraulic systems including hydraulic valves gas lines, operated in conditions of the Extreme North and North-Eastern regions of Russia

The invention relates to the production of organosilicon compositions, curable in the cold, in particular, to two-component compositions based on low molecular weight organopolysiloxane with terminal hydroxyl groups

The invention relates to the field of polymer processing, in particular, to obtain compositions for the outer layer of thermo-resistant laminates domestic, technical and special purpose, and can be used in the industry of artificial leather, plastic materials and rubber products

The invention relates to the protection of metals from corrosion by application of anti-corrosion coatings and can be used in corrosion protection of steel structures, piping, ventilation systems, equipment, construction chemical, nuclear, metallurgical industry, shipbuilding, agriculture, construction, energy, etc

The invention relates to curing the siloxane mixtures for cold-curing rubbers used as coating, impregnating compositions and binders
The invention relates to the manufacture of sheet gasket materials, in particular gasket material used to seal the junction of the cylinder and the cylinder in the internal combustion engines

Rubber composition // 2107078
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