Preparation method of organosilicon elastic gel

An elastic gel and silicone technology, which is applied in the field of silicone elastic gel preparation, can solve the problems of uneven particle size of elastomer powder, uneven product fineness, and difficult cleaning of reaction devices, etc., to achieve product fineness The effect of uniformity, low production cost and low equipment requirements

Inactive Publication Date: 2019-11-12
HUBEI XINHAIHONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some disadvantages in this process: the primary gel preparation process system is in a viscoelastic state, it is not easy to stir and disperse, and the reaction device is not easy to clean; after the primary gel is crushed by mechanical shearing, the particle size of the obtained elastomer powder is not uniform, and the product is delicate Uneven degree
[0007] Patent CN 106633076 A mentions spray curing technology to prepare silicone elastic gel, but this process has obvious disadvantages: the equipment requirements are relatively complicated, and the spray curing chamber needs to be cleaned regularly, otherwise the elastomer powder will block the pipeline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of silicone elastic gel, comprising the following preparation steps: (1) adding 535.23g of n-propanol, 200.00g of hydrogen-containing silicone oil with a hydrogen content of 0.43%, and 29.24g of 1,4-pentadiene into 1000ml In the three-necked flask, start stirring, after mixing evenly, add 0.38g of Pt catalyst dropwise to the three-necked flask under stirring conditions, the catalyst dosage is 500ppm, start to heat up at the same time, then react at 70°C for 3h under stirring conditions, and the rotation speed is 80rpm.

[0025] (2) After the reaction, stop heating, cool the reactant to below 40°C, and filter to obtain solid powder.

[0026] (3) The obtained solid powder was dried at 120° C., vacuum degree: −0.95 MPa, and stirred for 3 hours to obtain a silicone elastomer powder.

[0027] (4) Add 535.23g of polydimethylsiloxane with a viscosity of 10mpa.s and 400g of iron oxide yellow into the three-necked flask, and at 90°C and 80rpm, add the silico...

Embodiment 2

[0029] A method for preparing silicone elastic gel, comprising the following preparation steps: (1) adding 888.16g of n-propanol, 200.00g of hydrogen-containing silicone oil with a hydrogen content of 0.2%, and 22.04g of 1,7-octadiene to 1000ml In the three-necked flask, start stirring, after mixing evenly, add 0.67g of Pt catalyst dropwise to the three-necked flask under stirring conditions, the catalyst dosage is 600ppm, start to heat up at the same time, then react at 90°C for 8h under stirring conditions, and the rotation speed is 120rpm.

[0030] (2) After the reaction, stop heating, cool the reactant to below 40°C, and filter to obtain solid powder.

[0031] (3) Dry the obtained solid powder at 140° C., vacuum degree: −0.95 MPa, and stir for 2 hours to obtain silicone elastomer powder.

[0032] (4) Add 888.16g of polydimethylsiloxane with a viscosity of 5mpa.s and 250g of iron oxide yellow into the three-necked flask, and at 80°C and 70rpm, add the silicone elastomer pow...

Embodiment 3

[0034] A method for preparing silicone elastic gel, comprising the following preparation steps: (1) 840g of isopropanol, 200.00g of hydrogen-containing silicone oil with a hydrogen content of 0.06%, and 360.00g of vinyl with a vinyl mass fraction of 0.9% Add the end-capped polydimethylsiloxane into a 1000ml three-necked flask, start stirring, and after mixing evenly, add 0.16g of Pd catalyst dropwise to the three-necked flask under stirring conditions. The reaction was carried out at 90° C. for 8 hours, and the rotation speed was 90 rpm.

[0035] (2) After the reaction, stop heating, cool the reactant to below 40°C, and filter to obtain solid powder.

[0036] (3) Dry the obtained solid powder at 110° C., vacuum degree: −0.95 MPa, and stir for 2 hours to obtain silicone elastomer powder.

[0037] (4) Add 840 g of decamethylcyclopentasiloxane and 300 g of iron oxide yellow into a three-necked flask, and at 70° C. and 80 rpm, add the silicone elastomer powder obtained in step (3...

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Abstract

The invention belongs to the field of organosilicon, and more specifically relates to a preparation method of an organosilicon elastic gel. The preparation method comprises following steps: an organicsolvent, hydrogen containing silicone oil, and a polysiloxane containing at least two vinyl groups or a dialkene with nonsaturated double bonds on the two terminals are introduced into a reactor, uniform mixing is carried out, a catalyst is added, an obtained mixture is heated to 50 to 90 DEG C for 2 to 9h of deposition polymerization; after reaction, the mixture is cooled to be a temperature lower than 40 DEG C, filtering is carried out, an obtained solid powder is dried so as to obtain an organosilicon elastomer powder; the organosilicon elastomer powder is subjected to dilution swelling with a diluents, a stabilizing agent is added, and stirring is carried out for 1 to 2h at 70 to 90 DEG C at 30 to 90rpm to obtain the organosilicon elastic gel. The adopted organic solvent is a volatileorganic solvent capable of dissolving the reaction raw materials, but not capable of dissolving polymerization product, and the product can be mixed with an oil phase in the formula at random ratio at shearing conditions.

Description

technical field [0001] The invention belongs to the field of organic silicon materials, and in particular relates to a preparation method of organic silicon elastic gel. Background technique [0002] Silicone elastomers refer to silicon-containing polymers with different network crosslinking structures. According to different states, it can be divided into: silicone elastomer powder, silicone elastomer emulsion, silicone elastic gel. The mixture of dimethylsiloxane crosslinked polymer and diluent, called silicone elastic gel, is a mixture of silicone crosslinked polymer with three-dimensional network structure and small molecule solvent. Silicone elastic gel can give the skin a unique "velvety" skin feel, so it is widely used in the fields of daily cosmetics such as skin care, make-up, and deperspirants. [0003] The traditional silicone elastic gel preparation process has the following two methods: [0004] Method (1): First prepare the silicone elastomer nascent gel, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/07C08K3/22C08G77/44C08G77/38
CPCC08G77/38C08G77/44C08K2003/2272C08L83/04C08L2205/02C08L2205/025C08K3/22C08L83/10
Inventor 陶明海黄立忠
Owner HUBEI XINHAIHONG CHEM
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