A kind of fluorine-containing oil-resistant anti-swelling silicone rubber foam material and preparation method thereof

A foam material and anti-swelling technology, which is applied in the field of silicone rubber foam materials, can solve the problems of increased steric resistance of silicone rubber chain segments, poor dispersion compatibility of foaming agents, and difficulties in vulcanization and cross-linking foaming reactions. The effect of increased compatibility of the two-phase interface, simple and efficient preparation process, and excellent anti-swelling performance

Active Publication Date: 2022-03-08
HANGZHOU NORMAL UNIVERSITY
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Problems solved by technology

However, due to the shortcomings of physical foaming technology, such as complex and time-consuming process, poor structure / performance stability, and difficulty in large-scale preparation, it cannot meet the needs of large-scale applications in aerospace, high-speed rail and other fields.
[0005] The room temperature chemical foaming silicone rubber foam method has the characteristics of fast foaming rate, high preparation efficiency, simple processing technology, and is suitable for off-site molding. To prepare room temperature chemical foaming fluorine rubber foam, the preparation of dimethyl silicon The traditional method of rubber foam will be difficult to achieve the preparation of fluorine-containing silicone rubber foam
Because fluorosilicone rubber introduces trifluoropropyl group into the molecular structure of dimethyl silicone rubber, the steric hindrance of the side group of the silicone rubber chain segment increases significantly, and due to the existence of fluorine atoms on the side chain, the electronegativity is extremely high, resulting in The problem of affecting the activity of the reactive group and the poor dispersion compatibility of the blowing agent that reacts with it causes difficulties in the vulcanization, crosslinking and foaming reactions between different system components, thus making the silicone rubber foam preparation process difficult. It is difficult to match well between foaming and vulcanization, and the material is often foamed before vulcanization, so that the cells of the prepared silicone rubber foam are very uneven, and the average size of the cells is too large; or it is difficult to form enough foam before crosslinking. Many cell structures, unable to prepare stable foamed silicone rubber materials

Method used

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  • A kind of fluorine-containing oil-resistant anti-swelling silicone rubber foam material and preparation method thereof
  • A kind of fluorine-containing oil-resistant anti-swelling silicone rubber foam material and preparation method thereof
  • A kind of fluorine-containing oil-resistant anti-swelling silicone rubber foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of fluorine-containing oil-resistant and swelling-resistant silicone rubber foam (FSiRF):

[0039] Take 4.0 g of hydrogen-containing fluorosilicone oil with a viscosity of 55 mPa s and a hydrogen content of 0.3 wt%, and 16.0 g of perfluorosilicone oil with a viscosity of 20 Pa s and a vinyl content of 0.15 wt%, and add 0.1 g [(1,1- Dimethyl-2-propynyl)oxyl]trimethylsilane and 0.4g fluorosilicone surfactant AC-805 (Ark) mixed ethylene glycol (mass ratio 1:1), fully mixed evenly by mechanical stirring Then prepare component A; meanwhile, take 20.0 g of perfluorosilicone oil with a viscosity of 20 Pa s and a vinyl content of 0.15 wt %, add 0.47 g of chloroplatinic acid catalyst with a Pt mass concentration of 3000 ppm, and mix well by mechanical stirring Then prepare component B. Then, components A and B were mixed by mechanical stirring for 30s at a mass ratio of 1:1. After mixing evenly, let it react at room temperature for 5 minutes, and then put it in an o...

Embodiment 2

[0041] Preparation of fluorine-containing oil-resistant and anti-swelling silicone rubber foam material:

[0042] Take 5.0 g of hydrogen-containing fluorosilicone oil with a viscosity of 55 mPa·s and a hydrogen content of 0.3 wt%, and 15.0 g of a perfluorosilicone oil with a viscosity of 20 Pa·s and a vinyl content of 0.15 wt%, and add 0.1 g of 1-acetylene-1- (Trimethylsilyloxy)cyclohexane and 0.4g of glycerol (mass ratio 1:1) mixed with fluorosilicone surfactant BNK-4036 (Changhui Chemical Industry) were prepared by mechanical stirring and thorough mixing. Component A; at the same time, take 20.0g of perfluorosilicone oil with a viscosity of 20Pa·s and a vinyl content of 0.15wt%, add 0.47g of a chloroplatinic acid catalyst with a Pt mass concentration of 3000ppm, and prepare it after fully mixing it uniformly by mechanical stirring Component B. Then, components A and B were mixed by mechanical stirring for 30s at a mass ratio of 1:1. After mixing evenly, let it react at room...

Embodiment 3

[0044] Preparation of fluorine-containing oil-resistant and anti-swelling silicone rubber foam material:

[0045] Take 6.0 g of hydrogen-containing fluorosilicone oil with a viscosity of 75 mPa·s and a hydrogen content of 0.3 wt%, and 14.0 g of a perfluorosilicone oil with a viscosity of 20 Pa·s and a vinyl content of 0.35 wt%, and add 0.1 g [(1,1- Dimethyl-2-propynyl) oxygen group] triethylsilane and 0.4g glycerol (mass ratio 1:1) mixed with fluorosilicone surfactant BNK-4036 (Changhui Chemical Industry), by mechanical stirring Mix well and prepare component A; at the same time, take 20.0 g of perfluorosilicone oil with a viscosity of 20 Pa s and a vinyl content of 0.35 wt %, add 0.67 g of chloroplatinic acid catalyst with a Pt mass concentration of 3000 ppm, and stir it mechanically After mixing well and uniformly, component B is prepared. Then, components A and B were mixed by mechanical stirring for 30 seconds at a mass ratio of 1:1, and allowed to react at room temperatu...

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Abstract

The invention discloses a fluorine-containing, oil-resistant and swelling-resistant silicon rubber foam material and a preparation method thereof. The preparation method includes steps: (1) uniformly mixing hydrofluorosilicone oil, perfluorosilicone oil, foaming agent and inhibitor with a mass ratio of 1-2:3-4:0.01-0.5:0.01-0.2 to obtain component A , another perfluorosilicone oil is mixed with a platinum catalyst to obtain component B; in component A, the blowing agent is a mixture of fluorosilicon surfactant and hydroxyl-containing reagent, and the inhibitor is a silacetylene compound, and the structural formula is as follows: ,R 1 , R 2 , R 3 are independently selected from H, methyl or ethyl, and R is selected from cyclohexyl or isopropyl; in component B, the mass ratio of perfluorosilicone oil to platinum catalyst is 100:0.0001~0.01; (2) Component A and component B are mixed at a mass ratio of 1:1, stirred evenly, and reacted at room temperature for 5-30 minutes, and the obtained product is cross-linked and solidified at 50-125°C for 10-60 minutes.

Description

technical field [0001] The invention relates to the technical field of silicone rubber foam materials, in particular to a fluorine-containing, oil-resistant and swelling-resistant silicone rubber foam material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of my country's aerospace, rail transit, new energy vehicles and other fields, the demand for silicone rubber foam materials is becoming more and more refined, and the performance and technical requirements are getting higher and higher. In addition to the advantages of light weight and good resilience of traditional foam materials, silicone rubber foam also has the advantages of high and low temperature resistance, weather resistance, solvent resistance, electrical insulation, radiation resistance, and physiological inertia of silicone rubber. It can be widely used. It is used for the potting of electrical and electronic components and mechanical parts to preven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/08C08K5/5419C08J9/00C08J9/14C08J9/12
CPCC08J9/0042C08J9/142C08J9/125C08J2383/08C08J2483/08C08J2203/10C08J2203/12
Inventor 张国栋吴志豪汤龙程夏乔琦彭家建厉嘉云赵丽
Owner HANGZHOU NORMAL UNIVERSITY
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