阅读说明：本技术 一种可降解有机硅弹性体及其合成方法 (Degradable organic silicon elastomer and synthesis method thereof ) 是由 丁冰 梁秋鸿 杨静 葛利伟 徐培飞 于 2020-12-29 设计创作，主要内容包括：本发明提供了一种可降解有机弹性体及其合成方法。该可降解有机硅弹性体的合成方法包括如下步骤：1)第一组分：将第一醇与第一硅烷在第一催化剂的作用下通过酯交换反应得到第一预聚体；第一醇为二元醇或多元醇；第一硅烷为二官能度硅烷；2)第二组分：将第二醇与第二硅烷在第二催化剂的作用下通过酯交换反应得到第二预聚体,将第二预聚体与氨基硅烷混合；第二醇为二元醇或多元醇；第二硅烷为三官能度硅烷或四官能度硅烷；3)将第一组分、第二组分和无机填料混合,在第三催化剂的作用下反应得到可降解有机硅弹性体。本发明提供的合成方法得到的可降解有机弹性体在短期内具有良好的机械性能和拉伸性能,在特定条件下可降解。(The invention provides a degradable organic elastomer and a synthesis method thereof. The method for synthesizing the degradable silicone elastomer comprises the following steps: 1) a first component: performing ester exchange reaction on first alcohol and first silane under the action of a first catalyst to obtain a first prepolymer; the first alcohol is dihydric alcohol or polyhydric alcohol; the first silane is a difunctional silane; 2) a second component: carrying out ester exchange reaction on second glycol and second silane under the action of a second catalyst to obtain a second prepolymer, and mixing the second prepolymer with aminosilane; the second alcohol is dihydric alcohol or polyhydric alcohol; the second silane is trifunctional silane or tetrafunctional silane; 3) and mixing the first component, the second component and the inorganic filler, and reacting under the action of a third catalyst to obtain the degradable silicone elastomer. The degradable organic elastomer obtained by the synthesis method provided by the invention has good mechanical property and tensile property in a short time and can be degraded under specific conditions.)

1. A synthetic method of a degradable organic silicon elastomer is characterized by comprising the following steps:

1) a first component: performing ester exchange reaction on first alcohol and first silane under the action of a first catalyst to obtain a first prepolymer; the first alcohol is dihydric alcohol or polyhydric alcohol; the first silane is a difunctional silane;

2) a second component: carrying out ester exchange reaction on second glycol and second silane under the action of a second catalyst to obtain a second prepolymer, and mixing the second prepolymer with aminosilane; the second alcohol is dihydric alcohol or polyhydric alcohol; the second silane is trifunctional silane or tetrafunctional silane;

3) and mixing the first component, the second component and the inorganic filler, and reacting under the action of a third catalyst to obtain the degradable silicone elastomer.

2. The synthesis method according to claim 1, wherein in step 1), the diol is one or more of ethylene glycol, 1, 3-propanediol, 1, 4-butanediol, 1, 5-pentanediol and 1, 6-hexanediol, preferably 1, 4-butanediol; the polyalcohol is glycerol and/or pentaerythritol; the first alcohol is a dihydric alcohol;

and/or the difunctional silane is one or more of dimethyl dialkoxy silane, methyl propyl dialkoxy silane and methyl vinyl dialkoxy silane, preferably methyl propyl dimethoxy silane;

and/or the first catalyst is one of organic tin, Lewis acid, cation exchange resin, hydrochloric acid and acetic acid, preferably dibutyltin dilaurate, boron trifluoride diethyl etherate, tin tetrachloride, stannous chloride, aluminum chloride or hydrochloric acid, and more preferably tin tetrachloride.

3. The synthesis method according to claim 1 or 2, wherein in the step 1), the mass ratio of the first alcohol to the first silane is such that the molecular weight of the first prepolymer is 5000-30000 g/mol, preferably 10000-18000 g/mol; the first catalyst is used in an amount of 0.5 to 5 wt%, preferably 1.5 to 3 wt%, based on the total mass of the first alcohol and the first silane.

4. A synthesis method according to any one of claims 1 to 3, characterized in that in step 2), the diol is one or more of ethylene glycol, 1, 3-propanediol, 1, 4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, preferably 1, 6-hexanediol; the polyalcohol is glycerol and/or pentaerythritol; the second alcohol is preferably a diol;

and/or the trifunctional silane is one or more of methyltrimethoxysilane, methyltriethoxysilane, phenyltriethoxysilane, phenyltrimethoxysilane, butyltriethoxysilane and octyltriethoxysilane, preferably methyltrimethoxysilane; the tetrafunctional silane is tetramethoxysilane and/or tetraethoxysilane, preferably tetramethoxysilane; the second silane is preferably a trifunctional silane;

and/or the second catalyst is one of organic tin, Lewis acid, cation exchange resin, hydrochloric acid and acetic acid, preferably dibutyltin dilaurate, boron trifluoride diethyl etherate, tin tetrachloride, stannous chloride, aluminum chloride or hydrochloric acid, and further preferably tin tetrachloride;

and/or the aminosilane coupling agent is one or more of gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, bis- (trimethoxysilylpropyl) amine and bis- (triethoxysilylpropyl) amine, and preferably is N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane.

5. The synthesis method according to any one of claims 1 to 4, wherein in step 2), the second silane is reacted with the second glycol at a molar ratio of (1-6): 1, preferably (1.6-3): 1;

and/or the second catalyst is used in an amount of 0.3 to 3 wt%, preferably 0.8 to 2 wt%, based on the mass part of the second glycol.

6. The synthesis method according to any one of claims 1 to 5, wherein in step 2), the mass ratio of the aminosilane to the second prepolymer is 0.01 to 1.0, preferably 0.05 to 0.5.

7. The synthesis method according to any one of claims 1 to 6, wherein in step 3), the inorganic filler is kaolin, talc, calcium carbonate or white carbon, preferably white carbon;

and/or, the third catalyst is an organotin catalyst or a titanate catalyst, preferably an organotin catalyst, and more preferably dibutyltin dilaurate.

8. The synthesis method according to any one of claims 1 to 7, wherein in step 3), the mass ratio of the first component to the second component to the inorganic filler to the third catalyst is 100: (3-15): (80-150): (0.1 to 1), preferably 100: (5-10) 100-120): (0.2-0.5).

9. The synthesis process according to any one of claims 1 to 8, characterized in that in step 3), the reaction conditions are: the vacuum degree is-0.08 to-0.09 Mpa, the rotating speed is 600 to 1000rpm, the time is 20 to 80min, and the temperature is room temperature.

10. Degradable silicone elastomer prepared by the synthesis method of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of synthesis of silicone rubber, and particularly relates to a degradable organic silicon elastomer and a synthesis method thereof.

Background

The conventional organic silicon elastomers such as silicon rubber and the like have good weather resistance and are required to maintain good performance after being used for many years, so that the silicon rubber usually adopts Si-O-Si as a main framework structure, has good tolerance to ultraviolet rays, high temperature and the like, can resist corrosion of a small amount of acid and alkali to a certain extent, and is well applied to the fields of sealants, adhesives and the like.

With the increasing awareness of environmental protection policies, coupled with the risk of petroleum resources facing shortages, fully degradable materials based on non-petroleum bases are gaining more and more attention, such as: composite materials which are completely composed of biomass fibers (pineapple leaf fibers, hemp fibers and the like) and degradable resins such as polylactic acid and the like are more and more advantageous. However, current completely non-petroleum based product performance suffers from a number of deficiencies, particularly mechanical properties that are difficult to satisfy.

Disclosure of Invention

The invention aims to provide a method for synthesizing a degradable organic silicon elastomer, wherein the main chain of the degradable organic silicon elastomer obtained by the preparation method contains Si-O-C bonds, and the obtained degradable organic silicon elastomer has good mechanical properties in a short term and can be degraded into micromolecules for a long term like an elastomer taking Si-O-Si bonds as the main chain, so that the degradable organic silicon elastomer meets the requirement of environmental protection.

The synthesis method of the degradable organic silicon elastomer provided by the invention comprises the following steps:

1) a first component: performing ester exchange reaction on first alcohol and first silane under the action of a first catalyst to obtain a first prepolymer; the first alcohol is dihydric alcohol or polyhydric alcohol; the first silane is a difunctional silane;

2) a second component: carrying out ester exchange reaction on second glycol and second silane under the action of a second catalyst to obtain a second prepolymer, and mixing the second prepolymer with aminosilane; the second alcohol is dihydric alcohol or polyhydric alcohol; the second silane is trifunctional silane or tetrafunctional silane;

3) and mixing the first component, the second component and the inorganic filler, and reacting under the action of a third catalyst to obtain the degradable silicone elastomer.

The invention firstly synthesizes a first component obtained by ester exchange reaction of dihydric alcohol or polyalcohol and difunctional silane under the action of a catalyst, a second component obtained by mixing a second prepolymer obtained by ester exchange reaction of the dihydric alcohol or polyalcohol and the difunctional silane under the action of the catalyst and aminosilane, and then the easily degradable organic silicon elastomer obtained by the first component, the second component and inorganic filler under the action of the catalyst has good mechanical property and high tensile property in a short time.

In the invention, the synthesis path of the first prepolymer is as follows:

wherein R is₁、R₂May be methyl, propyl or vinyl; r₃May be methyl or ethyl; r₄Can be-CH₂CH₂-、-CH₂CH₂CH₂-、-CH₂CH(OH)CH₂-、-CH₂(CH₂)₄CH₂-and the like.

In a preferred embodiment of the present invention, in step 1), the diol includes, but is not limited to, one or more of ethylene glycol, 1, 3-propanediol, 1, 4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, preferably 1, 4-butanediol. The polyalcohol is glycerol and/or pentaerythritol. In step 1), the first alcohol is preferably a diol, and more preferably 1, 4-butanediol.

In a preferred embodiment of the invention, the difunctional silane is one or more of dimethyldialkoxysilane, methylpropyldialkoxysilane, methylvinyldialkoxysilane, where the alkoxy group may be methoxy or ethoxy, preferably methylpropyldimethoxysilane.

In a preferred embodiment of the present invention, the first catalyst is one of organotin, lewis acid/base, cation exchange resin, acetic acid, and sodium alkoxide, preferably dibutyltin dilaurate, boron trifluoride etherate, tin tetrachloride, stannous chloride, aluminum chloride, and sodium alkoxide, and more preferably tin tetrachloride.

In a preferred embodiment of the present invention, the mass ratio of the first alcohol to the first silane in step 1) is such that the molecular weight of the first prepolymer is 5000 to 30000g/mol, preferably 10000 to 18000 g/mol.

Wherein, the amount of the first catalyst is preferably 0.5 to 5 wt%, and more preferably 1.5 to 3 wt% of the total mass of the first alcohol and the first silane.

In a preferred embodiment of the present invention, the conditions of the transesterification reaction in the first component are: the reaction temperature is 60-65 ℃, and the reaction time is 2-3 h. After the ester exchange reaction is finished, distilling to remove impurities to obtain a light yellow transparent viscous liquid, namely a first prepolymer, which is used as a first component of the degradable organic silicon elastomer.

In a preferred embodiment of the present invention, in step 2), the synthesis path of the second prepolymer is:

wherein R is₅Is methyl, propyl, methoxy or ethoxy, R₄Can be-CH₂CH₂-、-CH₂CH₂CH₂-、-CH₂CH(OH)CH₂-、-CH₂(CH₂)₄CH₂-etc. R₃And may be methyl, ethyl, etc., and a and b are positive integers of not more than 4.

In a preferred embodiment of the present invention, in step 2), the dihydric alcohol includes, but is not limited to, one or more of ethylene glycol, 1, 3-propanediol, 1, 4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol. The polyalcohol is glycerol and/or pentaerythritol. The second glycol is preferably a diol, and more preferably 1, 6-hexanediol.

In a preferred embodiment of the present invention, the trifunctional silane is one or more of methyltrimethoxysilane, methyltriethoxysilane, phenyltriethoxysilane, phenyltrimethoxysilane, butyltriethoxysilane, octyltriethoxysilane, preferably methyltrimethoxysilane. The tetrafunctional silane may be a tetrafunctional silane that is tetramethoxysilane and/or tetraethoxysilane, preferably tetramethoxysilane. The second silane is preferably a trifunctional silane, and more preferably methyltrimethoxysilane.

In a preferred embodiment of the present invention, in the step 2) of preparing the second component, the molar ratio of the second silane to the second glycol is (1-6: 1), preferably (1.6-3: 1.

In a preferred embodiment of the present invention, the reaction mechanism of the second prepolymer of the second component in step 2) is the same as that of the first prepolymer in the first component, and the catalyst may be organic tin, lewis acid, cation exchange resin, hydrochloric acid, acetic acid, etc., preferably dibutyltin dilaurate, boron trifluoride diethyl etherate, tin tetrachloride, stannous chloride, aluminum chloride, hydrochloric acid, etc., and more preferably tin tetrachloride; the second catalyst accounts for 0.3-3 wt% of the mass of the second glycol, and preferably 0.8-2 wt%.

In a preferred embodiment of the invention, the aminosilane coupling agent is one or more of gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, bis- (trimethoxysilylpropyl) amine and bis- (triethoxysilylpropyl) amine, and preferably is N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane. The mass ratio of the aminosilane coupling agent to the second prepolymer is preferably 0.01-1.0, and more preferably 0.05-0.5. In a preferred embodiment of the present invention, the conditions of the transesterification reaction in the second component are: the reaction temperature is 50-55 ℃, and the reaction time is 1-2 h. And after the ester exchange reaction is finished, distilling to remove impurities to obtain low-viscosity light yellow transparent liquid, namely a second prepolymer, and mixing the second prepolymer with aminosilane to obtain a second component of the degradable organic silicon elastomer.

In a preferred embodiment of the present invention, in step 3), the inorganic filler is kaolin, talc, calcium carbonate or white carbon, preferably white carbon. The third catalyst is an organotin catalyst or a titanate catalyst, preferably an organotin catalyst, and more preferably dibutyltin dilaurate.

In a preferred embodiment of the present invention, in the step 3), the mass ratio of the first component, the second component, the inorganic filler, and the third catalyst is 100: (3-15): (80-150): (0.1 to 1), preferably 100: (5-10) 100-120): (0.2-0.5).

In step 3), the reaction conditions are preferably: the vacuum degree is-0.08 to-0.09 Mpa, the rotating speed is 600 to 1000rpm, the time is 20 to 80min, and the temperature is room temperature. In the invention, the step 3) is specifically as follows: and mixing the first component, the second component, the inorganic filler and the third catalyst in proportion, uniformly mixing at room temperature under vacuum of-0.08 to-0.09 Mpa and at the rotating speed of 600-.

The degradable organic silicon elastomer obtained by the synthesis method can be gradually decomposed into small molecules under one or more conditions of water, ultraviolet light, heat and the like.

Namely, the invention also aims to provide the degradable organic silicon elastomer prepared by the synthesis method.

The invention has the beneficial effects that:

(1) the easily degradable organic silicon elastomer obtained by the synthesis method provided by the invention has good mechanical properties in a short period, has good adhesive force with various fibers and base materials, and can endow the composite material with excellent short-term mechanical properties.

(2) According to the synthesis method provided by the invention, the first component and the second component are independently synthesized, and then the first component, the second component, the inorganic filler and the catalyst are reacted to synthesize the easily degradable organic silicon elastomer, so that the cross-linking density of the obtained easily degradable organic silicon elastomer can be effectively reduced, and the tensile property of the silicon elastomer is improved.

(3) The easily degradable organic silicon elastomer obtained by the invention has good tensile strength and good elongation at break, has good elongation at break after heat treatment, and can be gradually decomposed into micromolecules under one or more conditions of water, ultraviolet light, heat and the like, thereby realizing degradation and causing little pressure on the environment.

Detailed Description

The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

740g of methyl propyl dimethoxy silane, 443.2g of 1, 4-butanediol and 26.4g of stannic chloride are mixed in a 2L three-neck flask, the mixture is heated to react for 2 hours at the temperature of 60-65 ℃, the methanol reflux phenomenon is observed, a distillation device is changed, the temperature is gradually increased, the distillation is carried out to recover alcohol, the methanol produced by condensation, unreacted methyl propyl dimethoxy silane and 1, 4-butanediol are collected by reduced pressure distillation, the temperature is reduced, and a light yellow transparent viscous liquid with the molecular weight of about 10600g/mol is formed in a reaction bottle and is used as a first component of the elastomer for later use.

(2) Synthesis of the second component:

136.22g of methyltrimethoxysilane, 65.6g of 1, 6-hexanediol and 0.7g of stannic chloride are mixed in a 1L three-neck flask, the mixture reacts for 1 to 2 hours at the temperature of between 50 and 55 ℃, alcohol is distilled and collected when methanol is slightly refluxed, a low-viscosity light yellow transparent liquid is obtained, and 7g of the mixture is uniformly mixed with 0.4g of N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane to be used as a second component of the elastomer of the invention.

(3) Stirring 100g of the first component in the step (1), 7.2g of the second component in the step (2), 100g of white carbon black and 0.4g of dibutyltin dilaurate for 60min under vacuum-0.08 MPa and at the rotating speed of 1000rpm, extruding and standing for 1h at room temperature to obtain the silicone elastomer.

Example 2

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

740g of methyl propyl dimethoxy silane, 442.78g of 1, 4-butanediol and 17.74g of stannic chloride are mixed in a 2L three-neck flask, the mixture is heated to react for 2 hours at the temperature of 60-65 ℃, the phenomenon of methanol reflux is observed, a distillation device is changed, the temperature is gradually increased, the methanol is distilled and recovered, the methanol produced by condensation, unreacted methyl propyl dimethoxy silane and 1, 4-butanediol are collected by reduced pressure distillation, the temperature is reduced, and a light yellow transparent viscous liquid with the molecular weight of about 10000g/mol is arranged in a reaction bottle and is used as a first component of the elastomer of the invention for standby.

(2) Synthesis of the second component:

136.22g of methyltrimethoxysilane, 38.94g of 1, 6-hexanediol and 0.41g of stannic chloride are mixed in a 1L three-neck flask, the mixture is reacted for 1h at 50-55 ℃, alcohol is distilled and recovered when methanol is slightly refluxed, a low-viscosity light yellow transparent liquid is obtained, 7g of the low-viscosity light yellow transparent liquid is uniformly mixed with 0.4g of N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, and the mixture is used as a second component of the elastomer of the invention for standby.

(3) Stirring 100g of the first component in the step (1), 5g of the second component in the step (2), 100g of white carbon black and 0.2g of dibutyltin dilaurate for 20min under vacuum-0.09 Mpa and at the rotating speed of 1000rpm, and standing at room temperature for 5h after extrusion to obtain the silicone elastomer.

Example 3

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

740g of methyl propyl dimethoxy silane, 446.25g of 1, 4-butanediol and 35.6g of stannic chloride are mixed in a 2L three-neck flask, the mixture is heated to react for 2 hours at the temperature of 60-65 ℃, the phenomenon of methanol reflux is observed, a distillation device is changed, the temperature is gradually increased, the methanol is distilled and recovered, the methanol produced by condensation, unreacted methyl propyl dimethoxy silane and 1, 4-butanediol are collected by reduced pressure distillation, the temperature is reduced, and a light yellow transparent viscous liquid with the molecular weight of about 18000g/mol is arranged in a reaction bottle and is used as a first component of the elastomer of the invention for standby.

(2) Synthesis of the second component:

136.22g of methyltrimethoxysilane, 73.75g of 1, 6-hexanediol and 0.78g of stannic chloride are mixed in a 1L three-neck flask, the mixture reacts for 2h at the temperature of 50-55 ℃, alcohol is distilled and recovered when methanol slightly refluxes, low-viscosity light yellow transparent liquid is obtained, 7g of the mixture is uniformly mixed with 3.5g of N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, and the mixture is used as the second component of the elastomer of the invention for standby.

(3) Stirring 100g of the first component in the step (1), 10g of the second component in the step (2), 120g of white carbon black and 0.5g of dibutyltin dilaurate for 80min under vacuum-0.09 MPa and at the rotating speed of 600rpm, and standing for 1h at the room temperature for extrusion to obtain the silicone elastomer.

Example 4

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

740g of methyl propyl dimethoxy silane, 435g of 1, 4-butanediol and 5.9g of stannic chloride are mixed in a 2L three-neck flask, the mixture is heated and reacted for 2 hours at the temperature of 60-65 ℃, the phenomenon of methanol reflux is observed, a distillation device is changed into the reaction device, the temperature is gradually increased, the methanol is distilled and recovered, the unreacted methyl propyl dimethoxy silane, 1, 4-butanediol and the methanol produced by condensation are distilled and recovered under reduced pressure, the temperature is reduced, the reaction bottle is a light yellow transparent viscous liquid with the molecular weight of about 5000g/mol, and the viscous liquid is used as a first component of the elastomer of the invention for standby.

(2) Synthesis of the second component:

136.22g of methyltrimethoxysilane, 20.06g of 1, 6-hexanediol and 0.24g of stannic chloride are mixed in a 1L three-neck flask, the mixture reacts for 1h at the temperature of 50-55 ℃, alcohol is distilled and recovered when methanol micro-reflux exists, low-viscosity light yellow transparent liquid is obtained, 7g of the mixture is uniformly mixed with 0.07g of N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, and the mixture is used as the second component of the elastomer of the invention for standby.

(3) Stirring 100g of the first component in the step (1), 3g of the second component in the step (2), 80g of white carbon black and 0.1g of dibutyltin dilaurate for 60min under vacuum-0.08 MPa at the rotating speed of 1000rpm, and standing for 1h at the room temperature for extrusion to obtain the silicone elastomer.

Example 5

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

740g of methyl propyl dimethoxy silane, 448g of 1, 4-butanediol and 59.4g of stannic chloride are mixed in a 2L three-neck flask, the mixture is heated and reacted for 2 hours at the temperature of 60-65 ℃, the reflux phenomenon of methanol is observed, a distillation device is changed into the reaction device, the temperature is gradually increased, the methanol is distilled and recovered, the unreacted methyl propyl dimethoxy silane, 1, 4-butanediol and the methanol produced by condensation are distilled and recovered under reduced pressure, the temperature is reduced, the reaction bottle is a light yellow transparent viscous liquid with the molecular weight of about 30000g/mol, and the viscous liquid is used as a first component of the elastomer of the invention for standby.

(2) Synthesis of the second component:

136.22g of methyltrimethoxysilane, 118.12g of 1, 6-hexanediol and 1.65g of stannic chloride are mixed in a 1L three-neck flask, the mixture reacts for 1h at the temperature of 50-55 ℃, alcohol is distilled and recovered when methanol micro-reflux exists, low-viscosity light yellow transparent liquid is obtained, 7g of the mixture is uniformly mixed with 7g of N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, and the mixture is used as the second component of the elastomer of the invention for standby.

(3) Stirring 100g of the first component in the step (1), 15g of the second component in the step (2), 150g of white carbon black and 1g of dibutyltin dilaurate for 60min under vacuum-0.08 MPa and at the rotating speed of 1000rpm, and standing for 1h at the room temperature for extrusion to obtain the silicone elastomer.

Example 6

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

740g of methyl propyl dimethoxy silane, 424.7g of 1, 4-butanediol and 14g of stannic chloride are mixed in a 2L three-neck flask, the mixture is heated to react for 2 hours at the temperature of 60-65 ℃, the phenomenon of methanol reflux is observed, a distillation device is changed, the temperature is gradually increased, the methanol is distilled and recovered, the unreacted methyl propyl dimethoxy silane, 1, 4-butanediol and the methanol produced by condensation are distilled and recovered under reduced pressure, the temperature is reduced, and a light yellow transparent viscous liquid with the molecular weight of about 3000g/mol is formed in a reaction bottle and is used as a first component of the elastomer for standby.

(2) Synthesis of the second component:

136.22g of methyltrimethoxysilane, 14.75g of 1, 6-hexanediol and 0.15g of tin tetrachloride are mixed in a 1L three-neck flask, the mixture is reacted for 1h at 50-55 ℃, alcohol is distilled off when methanol is slightly refluxed, a low-viscosity pale yellow transparent liquid is obtained, 7g of the pale yellow transparent liquid is uniformly mixed with 0.035g of N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, and the mixture is used as the second component of the elastomer of the invention for standby.

(3) Stirring 100g of the first component in the step (1), 2g of the second component in the step (2), 75g of white carbon black and 0.08g of dibutyltin dilaurate for 60min under vacuum-0.08 MPa at the rotating speed of 1000rpm, and standing for 1h at the room temperature for extrusion to obtain the silicone elastomer.

Example 7

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

740g of methyl propyl dimethoxy silane, 448.64g of 1, 4-butanediol and 14.26g of stannic chloride are mixed in a 2L three-neck flask, the mixture is heated to react for 2 hours at the temperature of 60-65 ℃, the reflux phenomenon of methanol is observed, a distillation device is changed, the temperature is gradually increased, the methanol is distilled and recovered, the unreacted methyl propyl dimethoxy silane, 1, 4-butanediol and the methanol produced by condensation are distilled and recovered under reduced pressure, the temperature is reduced, and the reaction bottle is a light yellow transparent viscous liquid with the molecular weight of about 40000g/mol, which is used as the first component of the elastomer of the invention for standby.

(2) Synthesis of the second component:

136.22g of methyltrimethoxysilane, 118.12g of 1, 6-hexanediol and 15.25g of stannic chloride are mixed in a 1L three-neck flask, the mixture is reacted for 1h at 50-55 ℃, alcohol is distilled and recovered when methanol is slightly refluxed, a low-viscosity light yellow transparent liquid is obtained, 7g of the low-viscosity light yellow transparent liquid is uniformly mixed with 7.7g of N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, and the mixture is used as a second component of the elastomer of the invention for standby.

(3) Stirring 100g of the first component in the step (1), 18g of the second component in the step (2), 160g of white carbon black and 1.5g of dibutyltin dilaurate for 60min under vacuum-0.08 MPa at the rotating speed of 1000rpm, and standing for 1h at the room temperature for extrusion to obtain the silicone elastomer.

Example 8

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

740g of methyl propyl dimethoxy silane, 579.65g of 1, 6-hexanediol and 29.43g of dibutyltin dilaurate are mixed in a 2L three-neck flask, the mixture is heated and reacted for 2 hours at the temperature of 60-65 ℃, the phenomenon of methanol reflux is observed, a distillation device is changed, the temperature is gradually increased, the methanol is distilled and recovered, the unreacted methyl propyl dimethoxy silane, 1, 6-hexanediol and the methanol produced by condensation are distilled and recovered under reduced pressure, the temperature is reduced, and a light yellow transparent viscous liquid with the molecular weight of about 10600g/mol is formed in the reaction bottle and is used as a first component of the elastomer for later use.

(2) Synthesis of the second component:

136.22g of methyltrimethoxysilane, 50.07g of 1, 4-butanediol and 0.53g of dibutyltin dilaurate were mixed in a 1L three-necked flask, reacted at 50-55 ℃ for 1 hour, and when methanol was slightly refluxed, the alcohol was distilled off to obtain a low-viscosity pale yellow transparent liquid, and 7g of this liquid was mixed with 0.4g of gamma-aminopropyltrimethoxysilane and used as the elastomer second component of the present invention.

(3) Stirring 100g of the first component in the step (1), 7.4g of the second component in the step (2), 100g of talcum powder and 0.4g of tetra-n-butyl titanate for 60min under vacuum of-0.08 Mpa and at the rotating speed of 1000rpm, and standing for 1h at the room temperature for extrusion to obtain the silicone elastomer.

Example 9

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

740g of methyl propyl dimethoxy silane, 306g of ethylene glycol and 23.32g of stannous chloride are mixed in a 2L three-neck flask, the mixture is heated and reacted for 2 hours at the temperature of 60-65 ℃, the phenomenon of methanol reflux is observed, a distillation device is changed into the reaction device, the temperature is gradually increased, the methanol is distilled and recovered, unreacted methyl propyl dimethoxy silane, ethylene glycol and methanol produced by condensation are distilled and recovered under reduced pressure, the temperature is reduced, and a light yellow transparent viscous liquid with the molecular weight of about 10600g/mol is arranged in the reaction bottle and is used as a first component of the elastomer.

(2) Synthesis of the second component:

136.22g of methyltrimethoxysilane, 42.27g of propylene glycol and 0.45g of boron trifluoride diethyl etherate were mixed in a 1L three-necked flask, reacted at 50-55 ℃ for 1 hour, and when methanol was slightly refluxed, the alcohol was distilled off to give a low-viscosity, pale yellow, transparent liquid, 7g of which was mixed with 0.4g of bis- (trimethoxysilylpropyl) amine as a second component of the elastomer of the invention.

(3) Stirring 100g of the first component in the step (1), 7.2g of the second component in the step (2), 100g of calcium carbonate and 0.4g of dibutyltin diacetate for 60min under vacuum-0.08 MPa and at the rotating speed of 1000rpm, and standing for 1h at the room temperature for extrusion to obtain the silicone elastomer.

Example 10

The embodiment provides a degradable silicone elastomer, and the synthesis method comprises the following steps:

(1) synthesis of the first component:

in a 2L three-neck flask, 800g of methyl vinyl diethoxy silane, 787.92g of glycerol and 35.41g of stannic chloride are mixed, the mixture is heated and reacted for 2 hours at the temperature of 60-65 ℃, the methanol reflux phenomenon is observed, a distillation device is changed, the temperature is gradually increased, distillation is carried out, methanol is collected, unreacted methyl propyl dimethoxy silane, hexanediol and methanol produced by condensation are collected by reduced pressure distillation, the temperature is reduced, a light yellow transparent viscous liquid with the molecular weight of about 10600g/mol is arranged in a reaction bottle, and the viscous liquid is used as a first component of the elastomer.

(2) Synthesis of the second component:

208.33g of tetraethoxysilane, 75.64g of pentaerythritol and 0.8g of stannic chloride are mixed in a 1L three-neck flask, the mixture reacts for 1 to 2 hours at the temperature of 50 to 55 ℃, alcohol is distilled and collected when methanol slightly refluxes, light yellow transparent liquid with low viscosity is obtained, 7g of the mixture is uniformly mixed with 0.4g of N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, and the mixture is used as a second component of the elastomer of the invention for standby.

(3) Stirring 100g of the first component in the step (1), 7.4g of the second component in the step (2), 100g of white carbon black and 0.4g of dibutyltin dilaurate for 60min under vacuum-0.08 Mpa and at the rotating speed of 1000rpm, extruding and standing for 1h at room temperature to obtain the silicone elastomer.

Comparative example 1

The comparative example provides a degradable silicone elastomer, the synthetic method comprising the steps of:

(1) 740g of methyl propyl dimethoxy silane, 136.22g of methyl trimethoxy silane, 443.2g of 1, 4-butanediol, 65.6g of 1, 6-hexanediol and 27.1g of stannic chloride are mixed, heated at 60-65 ℃ for reaction for 2 hours, and when methanol slightly refluxes, the methanol is distilled and collected, and unreacted silane, alcohol and methanol produced by condensation are distilled and collected under reduced pressure to obtain yellow transparent liquid.

(2) Stirring 100g of the yellow transparent liquid obtained in the step (1), 0.4g of N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, 100g of white carbon black and 0.4g of dibutyltin dilaurate for 60min under vacuum of-0.08 MPa and at the rotating speed of 1000rpm, extruding and standing at room temperature for 1h to obtain the organic silicon elastomer.

The examples and comparative examples were subjected to performance testing: the elongation at break, tensile strength and the elongation at break and tensile strength after heating in an oven at 85 ℃ for 2 weeks and the state after a water bath at 60 ℃ of the silicone elastomers of the test examples and comparative examples under the same conditions are shown in table 1.

Table 1: performance results of examples and comparative examples

Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.