WO2017063419A1

WO2017063419A1 - Organosilicone chain extender and application

Info

Publication number: WO2017063419A1
Application number: PCT/CN2016/090645
Authority: WO
Inventors: 车国勇; 罗代宇; 翟天元; 熊婷; 王有治
Original assignee: 成都硅宝科技股份有限公司
Priority date: 2015-10-15
Filing date: 2016-07-20
Publication date: 2017-04-20
Also published as: CN105153219A; CN105153219B

Abstract

Disclosed is an organosilicone chain extender. The organosilicone chain extender has a structure of formula I, R₁ being alkyl containing 1 to 6 carbon atoms, R₂ being one selected from alkyl containing 1 to 6 carbon atoms, -N=CR₆(R₇) and -NR₈(R₉), R₃ being one selected from alkyl containing 1 to 6 carbon atoms, -N=CR₆(R₇) and -NR₈(R₉), R₂ and R₃ being same or different, R₄ or R₅ being one selected from hydrogen, alkyl, aryl, a perssad containing a formiate base, a perssad containing an acylamino or heterocyclic alkyl, R₄ and R₅ being same or different, and R₆, R₇, R₈ or R₉ being alkyl or cyclic alkyl. After the chain extender is applied to silicone rubber, the elongation is 430% to 820%.

Description

Silicone chain extender and application

Technical field

The invention belongs to the field of polymer organic materials, and particularly relates to a silicone chain extender and an application thereof.

Background technique

Low modulus, high elongation silicone sealing materials have excellent bonding properties, high deformation properties under low stress, excellent high temperature resistance, weather resistance, etc., and gap filling connections in roads, bridges, airport runways, etc. There are a wide range of applications. In order to prepare a low modulus silicone sealing material, it is generally required to reduce the degree of crosslinking, and a bifunctional chain extender matched with a silicone sealing material is selected to control the crosslinking speed, thereby achieving a decrease in modulus and elongation after curing of the sealant. The rate increases the effect.

US5053442 uses a bifunctional alkoxysilane as a chain extender to produce a low modulus silicone sealing material, but the material has poor storage and long curing time. US3996184, US4978706, US5246980, CN1597828, CN1618915 use amidosilane as a chain extender to obtain a low modulus silicone sealing material. The amide easily bleeds out of the surface after curing, resulting in reduced adhesion, seal failure, and environmental pollution. , limiting its scope of use. CN1597828 uses a bifunctional ketooxime silane as a chain extender to prepare a low modulus silicone sealing material, but the base polymer used in the process still needs a high viscosity base polymer, and the ketone oxime type chain extender activity The problem of long drying time and low elongation of the sealant is low. The activity of the dealcoholized chain extender is very low, and no application in silicone rubber has been reported.

At present, the silane chain extender used at home and abroad is mainly a deamidated chain extender, so that the amide substance produced after curing tends to pollute the environment. Therefore, the purpose of the present invention is to provide a silicone chain extender with adjustable activity and to be used in silicone rubber, which can be used for the preparation of low modulus sealant, which can significantly improve the elongation of the sealant without reducing the silicon. The adhesion of rubber without polluting the environment.

Summary of the invention

The object of the present invention is to provide a novel silicone chain extender which has adjustable activity, including depurination type, dealcoholization type, dehydroxylamine type, etc., on the one hand, by improving the type of hydrolysis group The activity is active, while on the other hand the activity of the compound is controlled by changing the organic groups on the ammonia.

The invention is based on the introduction of an electron withdrawing group, a carbonyl compound (ester group, urea group) or an electron donating group such as diethyl, phenyl, etc. in the nitrogen atom of the a-aminomethylsilane chain extender, which greatly increases the expansion. The activity of the chain agent, on the other hand, by using different hydrolyzable groups, such as mercapto groups, alcohols, hydroxylamines, etc., further adjusting the activity of the chain extender, making it more active than the cross-linking agent, and being applied to the silicone rubber, Significantly increase the elongation of silicone rubber.

In order to achieve the above technical effects, the present invention adopts the following technical solutions:

The present invention provides a silicone chain extender having the structure of Formula I:

Formula I, wherein

R ₁ is an alkyl group having 1 to 6 carbon atoms;

R _{2 is} selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, -N=CR ₆ (R ₇ ), and -NR ₈ (R ₉ );

R _{3 is} selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, -N=CR ₆ (R ₇ ), and -NR ₈ (R ₉ ); and R ₂ and R _{3 are the} same or different;

R _{4 is} selected from the group consisting of hydrogen, an alkyl group, an aryl group, a formate group-containing group, an amide group-containing group or a heterocycloalkyl group;

R _{5 is} selected from hydrogen, an alkyl group, an aryl group, a formate group-containing group, an amide group-containing group or a heterocycloalkyl group; and R ₄ and R _{5 are the} same or different;

R ₆ , R ₇ , R ₈ or R ₉ is an alkyl group or a cyclic alkyl group.

A further technical solution is that R ₁ is a linear alkyl group having 1 to 6 carbon atoms, a branched alkyl group having 1 to 6 carbon atoms, and a cyclic alkane having 1 to 6 carbon atoms. One of an aromatic alkyl group having 1 to 6 carbon atoms or an alkanearyl group having 1 to 6 carbon atoms.

In a further technical solution, the R ₄ or R ₅ is a group containing a formate group, and the group has the structure of the formula II:

Formula II wherein R ₁₀ is an alkyl group having 1 to 18 carbon atoms.

In a further technical solution, the R ₄ or R ₅ is an amide group-containing group having the structure of the formula III:

Formula III wherein R ₁₁ or R _{12 is} selected from the group consisting of hydrogen, an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms, and a benzyl group.

In a further technical solution, the R ₄ or R ₅ is a heterocycloalkyl group having the structure of the formula IV:

Formula IV wherein R ₁₃ is an alkyl group having 1 to 12 carbon atoms, and the alkyl group is one of a linear alkyl group, a branched alkyl group, and a cyclic alkane.

In a further technical solution, the R ₁₃ is an alkyl group having 1 to 12 carbon atoms, and the alkyl segment contains one or more of N, O, S or a carbonyl group and a hydroxyl group.

In a further technical solution, the R ₄ or R _{5 is} selected from the group consisting of pyrrole, imidazole, oxazole, piperidine, morpholine and oxazine.

In a further technical solution, the R ₄ or R _{5 is} selected from one of hydrogen, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, phenyl, benzyl.

A further technical solution is that R _{10 is} selected from one of methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, benzyl, dodecyl and octadecyl. Kind.

The invention also provides the use of the silicone chain extender in silicone rubber.

The invention will be further described below.

A silicone chain extender having the structure of Formula I:

Formula I, wherein

R ₁ is an alkyl group having 1 to 6 carbon atoms;

R ₆ , R ₇ , R ₈ or R ₉ is an alkyl group or a cyclic alkyl group.

According to a particular embodiment of the invention, R ₁ is a linear alkyl group having 1 to 6 carbon atoms, a branched alkyl group having 1 to 6 carbon atoms, a ring having 1 to 6 carbon atoms One of an alkane, an aromatic alkyl group having 1 to 6 carbon atoms or an alkanearyl group having 1 to 6 carbon atoms. According to a more specific embodiment of the invention, said R _{1 is} selected from the group consisting of methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl; in accordance with a preferred embodiment of the invention, The R _{1 is} selected from one of a methyl group and an ethyl group.

In an embodiment of the invention, the R ₂ or R _{3 is} selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, -N=CR ₆ (R ₇ ), and -NR ₈ (R ₉ ) . A further technical solution is that R ₂ or R _{3 is} selected from an alkyl group having 1 to 6 carbon atoms, and specifically R ₂ or R _{3 is} selected from the group consisting of methyl, ethyl, n-propyl and n-butyl groups. One of isopropyl, isobutyl, phenyl, benzyl. According to a more preferred embodiment of the invention, said R ₂ or R ₃ is methyl, ethyl, n-propyl or n-butyl.

A further technical solution is that R ₂ or R ₃ is -N=CR ₆ (R ₇ ), wherein R ₆ and R ₇ are alkyl or cyclic alkyl. According to a particular embodiment of the invention, the R ₆ or R _{7 is} selected from one of a methyl group, an ethyl group, a propyl group, a butyl group, an isopropyl group, an isobutyl group, and a cyclic silane. According to a more preferred embodiment of the invention, said R ₆ or R _{7 is} selected from one of methyl, ethyl, n-propyl and n-butyl.

A further technical solution is that R ₂ or R ₃ is -NR ₈ (R ₉ ), wherein R ₈ and R ₉ are alkyl or cyclic alkyl. According to a particular embodiment of the invention, the R ₈ or R _{9 is} selected from one of a methyl group, an ethyl group, a propyl group, a butyl group, an isopropyl group, an isobutyl group, and a cyclic silane. According to a more preferred embodiment of the invention, said R ₈ or R 9 _{7 is} selected from one of methyl, ethyl, n-propyl and n-butyl. According to a particular embodiment of the invention, said R ₄ or R _{5 is} selected from the group consisting of hydrogen, alkyl, aryl; according to a more specific embodiment of the invention, said R ₄ or R _{5 is} selected from the group consisting of hydrogen, methyl, One of ethyl, n-propyl, n-butyl, isopropyl, isobutyl, phenyl, benzyl. According to a preferred embodiment of the invention, said R ₄ or R _{5 is} selected from propyl or n-butyl.

According to a particular embodiment of the invention, said R ₄ or R ₅ is a formate group-containing group having the structure of formula II:

Formula II wherein R ₁₀ is an alkyl group having 1 to 18 carbon atoms. According to a preferred embodiment of the invention, said R _{10 is} selected from the group consisting of methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, benzyl, dodecyl, octadecyl One kind. According to a more preferred embodiment of the invention, said R ₁₀ is methyl or ethyl.

According to a particular embodiment of the invention, said R ₄ or R ₅ is an amide group-containing group having the structure of formula III:

Formula III wherein R ₁₁ or R _{12 is} selected from the group consisting of hydrogen, an alkyl group having 1 to 18 carbon atoms, an aryl group, and a benzyl group. According to a preferred embodiment of the invention, said R ₁₁ or R _{12 is} selected from the group consisting of hydrogen, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, aryl, benzyl, twelve One of the alkyl groups. According to a more preferred embodiment of the invention, said R ₁₁ or R ₁₂ is hydrogen.

According to a particular embodiment of the invention, said R ₄ or R ₅ is heterocycloalkyl, said heterocycloalkyl having the structure of formula IV:

According to a specific embodiment of the present invention, the R ₁₃ is an alkyl group having 1 to 12 carbon atoms, and the alkyl segment contains one or more of N, O, S or a carbonyl group and a hydroxyl group.

According to a particular embodiment of the invention, said R ₄ or R _{5 is} selected from the group consisting of pyrrole, imidazole, oxazole, piperidine, morpholine, oxazine. According to a preferred embodiment of the invention, said R ₄ or R ₅ is morpholine.

In the present invention, the silicone rubber chain extender tests the silicone rubber elongation as follows:

200 g parts by mass of α,ω-dihydroxypolydimethylsiloxane, 180 parts by mass of nano-filler, dehydrated and blended at 120 ° C, vacuum degree 0.06 Mpa for 60 min., transferred into a high-speed disperser and cooled to room temperature to obtain a base material. 4 parts by mass of a silicone chain extender, 8 parts by mass of a crosslinking agent, 0.1 parts by mass of a catalyst, 5 parts by mass of a filler, and 50 parts by mass of a plasticizer are added to a vacuum mixer and stirred, and then discharged. Detected at a relative humidity of 50 ± 5% at room temperature. In the testing step of the invention, the nanofiller is a fumed silica having a specific surface area of 300 m ² /g, and the crosslinking agent is methyltributyrin mercaptosilane or methyltrimethoxysilane. The catalyst is dibutyltin dilaurate, and the plasticizer is α,ω-dimethylpolydimethylsiloxane.

Tensile strength and elongation at break were tested in accordance with the GT/T 528-2009 method.

Compared with the prior art, the invention has the following beneficial effects:

The silicone chain extender of the invention has high activity, and is first extended and crosslinked in the curing process, and the elongation of the chain extender applied to the silicone rubber is 430-820%.

detailed description

The invention is further illustrated and described below in conjunction with the embodiments of the invention.

Preparation of raw materials:

Add 209.9 g (4.58 mol) of absolute ethanol and 500 mL of petroleum ether to a 3 L three-necked flask. Hold the nitrogen flow rate at 0.1ml/min, stir evenly in an ice water bath, control the internal temperature at about 10 °C, then add 300g (1.85mol) (chloromethyl)methyldichlorosilane dropwise, about 1h The reaction was then continued at 40 ° C for 3 h. Then, the solvent and the unreacted ethanol were distilled off under a vacuum of 0.05 Mpa, and then subjected to atmospheric distillation, and the product was collected at 94-95 ° C to obtain 320 g of colorless transparent (chloromethyl)methyldiethoxysilane. 96%.

Preparation of (chloromethyl)methylethoxybutanone decylsilane

300 g (1.85 mol) of (chloromethyl)methyldichlorosilane, 500 ml of petroleum ether and 387.2 g (3.83 mol) of triethylamine were added to a 3 L three-necked flask, and after stirring evenly in an ice water bath, the internal temperature was controlled at 10 After about °C, 85.1g (1.85mol) of absolute ethanol was added dropwise. After about 2h, the addition of 161.1g (1.85mol) of butanone oxime was slowly added. After about 2h, the reaction was continued at 40 °C for 3 hours. . Then, the solvent and the unreacted ethanol and butanone oxime were distilled off under a vacuum of 0.05 MPa, and then rectified, and 93-99 ° C/10 mmHg product was collected to obtain pale yellow transparent chloromethyl)methyl ethoxybutanone oxime. The base silane was 310 g, and the yield was 75.1%.

According to the above method, anhydrous ethanol may be replaced by a different combination of one or more of methanol, propanol, isopropanol, butanol, isobutanol, butanone oxime, and N,N-diethylhydroxylamine.

Example 1:

290.8 g (1.59 mol) of (chloromethyl)methyldiethoxysilane, 152.2 g (1.75 mol) of morpholine, 178.2 g (1.75 mol) of triethylamine, 0.4 g of KI and 800 mL of petroleum ether were placed in a 3 L three-necked flask. After reacting at 60 ° C for 4 h under nitrogen atmosphere. The resulting triethylamine hydrochloride was removed by filtration, and the filtrate was evaporated to remove the solvent and unreacted triethylamine and morpholine, followed by distillation, and the product was collected at 125-132 ° C/10 mmHg to obtain an orange-yellow transparent (morpholinylmethyl group). 294.1 g of methyldiethoxysilane, the yield was 79.4%.

¹ H NMR (300MHz, CDCl ₃ ), δ 3.67 (4H), 3.60 (4H), 2.45 (4H), 2.20 (2H), 1.10 (6H), 0.16 (3H)

Elemental analysis: C% 51.39, H% 9.88, N% 5.94.

Example 2:

132 g (0.5 mol) of (chloromethyl)methyldibutanone decylsilane, 46.2 g (0.53 mol) of morpholine, 53.6 g (0.53 mol) of triethylamine, 0.2 g of KI and 300 ml of petroleum ether were placed in a 1 L three-necked flask. After reacting at 75 ° C for 6 h under nitrogen atmosphere, the resulting triethylamine hydrochloride was removed by filtration, and the filtrate was rotary evaporated to remove the solvent and unreacted triethylamine and morpholine, followed by distillation to collect 143-150 ° C / 8 mmHg. The product obtained 118.2 g of orange-yellow transparent (morpholinylmethyl)methyldibutanone decylsilane in a yield of 74.9%.

¹ H NMR (300MHz, CDCl ₃ ), δ 3.63 (4H), 2.40 (14H), 2.18 (2H), 1.08 (6H), 0.18 (3H)

Elemental analysis: C% 53.31, H% 9.25, N% 13.29.

Example 3:

182.1 g (1.0 mol) of (chloromethyl)methyldiethoxysilane, 124.2 g (1.05 mol) of n-propylamine, 0.1 g of KI, 300 ml of petroleum ether were placed in a 1 L three-necked flask, and reacted under nitrogen for 7 h at 75 ° C. Thereafter, the resulting n-propylamine hydrochloride was removed by filtration, and the filtrate was evaporated to remove solvent and unreacted n-propylamine. Then, 90 g (1.0 mol) of dimethyl carbonate was added, and the mixture was reacted at 85 ° C for 2 h. After the reaction liquid was distilled off to remove the low-boiling and unreacted dimethyl carbonate, the product was collected at 185-192 ° C / 6 mmHg to obtain a pale yellow transparent N-n-propyl-N-carboxymethyl ester-α- (carbamoyl) 18) g of methyl diethoxysilane product, the yield was 70.4%.

^{_{1 H NMR (300MHz, CDCl 3}} ), δ3.75 (7H), 2.83 (2H), 2.15 (2H), 1.58 (2H), 1.13 (6H), 0.85 (3H), 0.20 (3H)

Elemental analysis: C% 50.10, H% 9.53, N% 5.30.

Example 4:

154 g (1.0 mol) of (chloromethyl)methyldimethoxysilane, 124.2 g (1.05 mol) of n-propylamine, 0.1 g of KI, 300 ml of petroleum ether were placed in a 1 L three-necked flask, and reacted at 75 ° C for 8 h under a nitrogen atmosphere. , The resulting n-propylamine hydrochloride was removed by filtration, and the filtrate was evaporated to remove solvent and unreacted n-propylamine. Then, 90 g (1.0 mol) of dimethyl carbonate was added and reacted at 85 ° C for 2 h. After the reaction liquid was distilled off to remove the low-boiling and unreacted dimethyl carbonate, the product was collected at 178-184 ° C / 6 mmHg to obtain a pale yellow transparent N-n-propyl-N-formic acid methyl ester-α- (carbamoyl) 179.1 g of methyl dimethoxysilane, the yield was 76.2%.

^{_{1 H NMR (300MHz, CDCl 3}} ), δ3.82 (3H), 3.68 (6H), 2.78 (2H), 2.18 (2H), 1.56 (2H), 0.87 (3H), 0.18 (3H)

Elemental analysis: C% 45.89, H% 8.95, N% 6.02.

Example 5:

182.1 g (1.0 mol) of (chloromethyl)methyldiethoxysilane, 76.8 g (1.05 mol) of n-butylamine, 0.1 g of KI, 300 ml of petroleum ether were placed in a 1 L three-necked flask and reacted at 75 ° C under nitrogen atmosphere. After 8 h, the resulting n-butylamine hydrochloride was removed by filtration, and the solvent was evaporated to remove solvent and unreacted n-butylamine. Then, 90 g (1.0 mol) of dimethyl carbonate was added and reacted at 85 ° C for 2 h. After the reaction liquid was distilled off to remove low-boiling and unreacted dimethyl carbonate, the product was collected at 190-196 ° C / 6 mmHg to obtain a pale yellow transparent N-n-butyl-N-formic acid methyl ester-α- (carbamoyl) 150.3 g of methyldiethoxysilane product, the yield was 54.2%.

^{_{1 H NMR (300MHz, CDCl 3}} ), δ3.75 (7H), 2.83 (2H), 2.15 (2H), 1.54 (2H), 1.34 (2H), 1.13 (6H), 0.85 (3H), 0.20 (3H )

Elemental analysis: C% 51.60, H% 9.80, N% 5.02.

Example 6

182.1 g (1.0 mol) of (chloromethyl)methyldiethoxysilane, 124.2 g (1.05 mol) of n-propylamine, 0.1 g of KI, 300 ml of petroleum ether were placed in a 1 L three-necked flask, and reacted under nitrogen for 7 h at 75 ° C. Thereafter, the resulting n-propylamine hydrochloride was removed by filtration, and the filtrate was evaporated to remove solvent and unreacted n-propylamine. Then, 118.1 g (1.0 mol) of diethyl carbonate was added and reacted at 90 ° C for 2 h. After the reaction liquid was distilled off to remove low-boiling and unreacted diethyl carbonate, 193-198 ° C / 6 mmHg product was collected to obtain a pale yellow transparent N- n-propyl-N-carboxylate-α-(aminomethyl)methyldiethoxysilane 128.3 g product, yield 46.3%.

¹ H NMR (300MHz, CDCl ₃ ), δ 3.93 (6H), 2.75 (2H), 2.20 (2H), 1.48 (11H), 0.89 (3H), 0.17 (3H)

Elemental analysis: C% 51.92, H% 9.78, N% 5.02.

Example 7

154 g (1.0 mol) of (chloromethyl)methyldimethoxysilane, 124.2 g (1.05 mol) of n-propylamine, 0.1 g of KI, 300 ml of petroleum ether were placed in a 1 L three-necked flask, and reacted at 75 ° C for 8 h under a nitrogen atmosphere. The resulting n-propylamine hydrochloride was removed by filtration, and the filtrate was evaporated to remove solvent and unreacted n-propylamine. Then, 60 g (1.0 mol) of urea was added and reacted at 90 ° C for 3 h. The reaction liquid was distilled to remove low-boiling substances, and a product of 212-218 ° C / 6 mmHg was collected to obtain a pale yellow transparent N-n-propyl-N-amido-α-(aminomethyl)methyldimethoxysilane 92.3 g. Product, yield 41.9%.

^{_{1 H NMR (300MHz, CDCl 3}} ), δ5.63 (2H), 3.65 (6H), 2.68 (2H), 2.15 (2H), 1.52 (2H), 0.87 (3H), 0.14 (3H)

Elemental analysis: C% 43.58, H% 9.16, N% 12.68.

Example 8

The chain extenders obtained in Examples 1 to 7 were applied to silicone rubber with methylvinyldimethoxysilane, methylvinyldibutanonesulfonylsilane and methylvinyldihexanoylaminosilane. The elongation at break and tensile strength of the procedure described in the Summary of the Invention are shown in Table 1.

Table 1 Effect of different chain extenders on elongation at break

扩链剂Chain extender	断裂伸长率Elongation at break	拉伸强度(Mpa)Tensile strength (Mpa)
不加do not add	200％200%	1.581.58
实施例1Example 1	430％430%	1.451.45
实施例2Example 2	650％650%	1.381.38
实施例3Example 3	720％720%	1.351.35

实施例4Example 4	820％820%	1.301.30
实施例5Example 5	580％580%	1.401.40
实施例6Example 6	620％620%	1.391.39
实施例7Example 7	480％480%	1.421.42
甲基乙烯基二甲氧基硅烷Methylvinyldimethoxysilane	230％230%	1.561.56
甲基乙烯基二丁酮肟基硅烷Methyl vinyl dibutyl ketone sulfonyl silane	260％260%	1.531.53
甲基乙烯基二己内酰氨基硅烷Methylvinyldihexanoylaminosilane	460％460%	1.431.43

Although the present invention has been described herein with reference to the preferred embodiments of the present invention, the embodiments of the present invention are only preferred embodiments of the present invention, and the embodiments of the present invention are not limited by the above embodiments, and it should be understood that those skilled in the art Many other modifications and embodiments can be devised which fall within the scope and spirit of the principles disclosed herein.

Claims

A silicone chain extender characterized in that the silicone chain extender has the structure of Formula I:

Formula I, wherein

R 1 is an alkyl group having 1 to 6 carbon atoms;

R 2 is selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, -N=CR 6 (R 7 ), and -NR 8 (R 9 );

R 3 is selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, -N=CR 6 (R 7 ), and -NR 8 (R 9 ); and R 2 and R 3 are the same or different;

R 4 is selected from the group consisting of hydrogen, an alkyl group, an aryl group, a formate group-containing group, an amide group-containing group or a heterocycloalkyl group;

R 5 is selected from hydrogen, an alkyl group, an aryl group, a formate group-containing group, an amide group-containing group or a heterocycloalkyl group; and R 4 and R 5 are the same or different;

R 6 , R 7 , R 8 or R 9 is an alkyl group or a cyclic alkyl group.
The silicone chain extender according to claim 1, wherein said R 1 is a linear alkyl group having 1 to 6 carbon atoms, a branched alkyl group having 1 to 6 carbon atoms, and the like One of a cyclic alkane of 1 to 6 carbon atoms, an aromatic alkyl group having 1 to 6 carbon atoms or an alkanearyl group having 1 to 6 carbon atoms.
The silicone chain extender according to claim 1, wherein said R 4 or R 5 is a formate group-containing group having a structure of formula II:
Formula II wherein R 10 is an alkyl group having 1 to 18 carbon atoms.
The silicone chain extender according to claim 1, wherein said R 4 or R 5 is an amide group-containing group having a structure of formula III:
Formula III wherein R 11 or R 12 is selected from the group consisting of hydrogen, an alkyl group having 1 to 18 carbon atoms, an aryl group, and a benzyl group.
The silicone chain extender according to claim 1, wherein said R 4 or R 5 is a heterocycloalkyl group having a structure of formula IV:
Formula IV wherein R 13 is an alkyl group having 1 to 12 carbon atoms, and the alkyl group is one of a linear alkyl group, a branched alkyl group, and a cyclic alkane.
The silicone chain extender according to claim 5, wherein R 13 is an alkyl group having 1 to 12 carbon atoms, and the alkyl segment contains N, O, S or a carbonyl group or a hydroxyl group. One or more.
The silicone chain extender according to claim 1, wherein said R 4 or R 5 is one selected from the group consisting of pyrrole, imidazole, oxazole, piperidine, morpholine, and oxazine.
The silicone chain extender according to claim 1, wherein said R 4 or R 5 is selected from the group consisting of hydrogen, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, One of a phenyl group and a benzyl group.
The silicone chain extender according to claim 3, wherein said R 10 is selected from the group consisting of methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, benzyl, and twelfth. One of an alkyl group and an octadecyl group.
Use of the silicone chain extender of any of claims 1-9 in silicone rubber.