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Boron-containing siloxane and boryl self-adhesion silicone rubber and preparation method thereof

A technology of borosiloxane and silicone rubber, which is applied in the field of borosiloxane, boron-based self-adhesive silicone rubber and its preparation, can solve the problem of unimproved adhesion, and achieve high bonding strength and preparation The effect of simple process

Inactive Publication Date: 2020-11-24
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current self-adhesive silicone rubber products still need to be improved in terms of adhesion

Method used

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  • Boron-containing siloxane and boryl self-adhesion silicone rubber and preparation method thereof
  • Boron-containing siloxane and boryl self-adhesion silicone rubber and preparation method thereof
  • Boron-containing siloxane and boryl self-adhesion silicone rubber and preparation method thereof

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preparation example Construction

[0036] The embodiment of the present invention provides the preparation method of the boron-containing siloxane, which includes: mixing dihydrocarbyl dialkoxysilane, hydrocarbyl vinyl dialkoxysilane and boric acid and then performing a polymerization reaction to obtain the aforementioned boron-containing siloxane borosiloxane.

[0037] In the embodiment of the present invention, the dihydrocarbyldialkoxysilane (R 1 R 2 Si(OR 5 ) 2 ), hydrocarbylvinyldialkoxysilane (R 3 (CH 2 =CH)Si(OR 6 ) 2 ), boric acid is prepared into a mixed solution according to a certain ratio, and then the mixed solution is heated to a predetermined temperature, preferably refluxed for a period of time under stirring, and then the reaction solution obtained by vacuum rotary evaporation at a certain temperature to remove residual silane monomers and small Molecular by-products, resulting in colorless viscous or colloidal borosiloxane.

[0038] In the embodiment of the present invention, specific ...

Embodiment 1

[0054] Add 1.0 mol of dimethoxydimethylsilane, 0.002 mol of methylvinyldiethoxysilane, and 0.75 mol of boric acid into the single-necked bottle, heat up the resulting mixture to 75°C, stir for 2 hours, and evaporate in vacuum at 90°C The reaction liquid is cooled to obtain a high-viscosity emulsion, which is borosiloxane.

[0055] figure 1 Is the infrared spectrum analysis of the borosiloxane obtained by polymerization, wherein, 1070cm -1 is the absorption peak of the main chain Si-O bond, 1345cm -1 is the absorption peak of the main chain B-O bond, indicating that the monomer is polymerized into a polymer chain with —Si—O—B— as the main chain. In addition, 1260cm -1 、2905cm -1 、2962cm -1 is the absorption peak of the C-H bond in the side methyl group, 863cm -1 is the absorption peak of the main chain and the side methyl Si-C bond, 803cm -1 The place is the absorption peak of the B-OH bond of the unreacted group of boric acid, 1603cm -1 The place is the side vinyl C=C ...

Embodiment 2

[0059] Add 1.5 mol of dimethoxydimethylsilane, 0.06 mol of methylvinyldiethoxysilane, and 0.7 mol of boric acid into the single-necked bottle, heat the resulting mixture to 75°C, stir for 2 hours, and evaporate in vacuum at 90°C The reaction liquid is cooled to obtain a high-viscosity emulsion, which is borosiloxane.

[0060]Using trichlorobenzene as a solvent, under the condition of 150°C and a flow rate of 1.00ml / min, the number average molecular weight of the obtained borosiloxane was measured to be 59690, the weight average molecular weight was 289923, and the polydispersity coefficient was 4.86.

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Abstract

The invention provides boron-containing siloxane and boryl self-adhesion silicone rubber and a preparation method thereof. Boron-containing siloxane is a linear polymer with -Si-O-B- as a main chain and contains a repeating unit represented by a formula I (shown in the description), wherein R1, R2 and R3 are independently selected from one or more of hydrogen, methyl, ethyl, propyl and aryl, and R4 is selected from one or more of hydroxyl and a siloxane branched chain. By introducing the boron-containing siloxane into the silicone rubber so as to obtain the silicone rubber with the self-adhesion property, and the adhesion strength of the silicone rubber is high. Besides, a preparation process of the boron-containing siloxane is simple. By carrying out stretching overlapping and winding adhesion on the boryl self-adhesion silicone rubber, the boryl self-adhesion silicone rubber has relatively strong adhesion strength in the preliminary stage but can still be stripped off; and after thesilicone rubber is placed for a period of time, adhered parts are nearly fused together and cannot be stripped off, and a winding layer can only be removed in a damaging manner. Meanwhile, the self-adhesion silicone rubber has the characteristics of high temperature resistance, low temperature resistance, weather resistance and insulativity and the like.

Description

technical field [0001] The invention belongs to the technical field of special rubber, and in particular relates to boron-containing siloxane, boron-based self-adhesive silicone rubber and a preparation method thereof. Background technique [0002] Due to the large amount of electrical equipment that needs to be managed and maintained in substations, abnormal equipment often occurs during operation. The insulation protection of substations, especially the insulation protection of old substations, is becoming more and more important. Pollution flashover, condensation flashover, ice-covered trip, small animal short circuit, bare busbars, etc. caused personal casualties in early substations, and the situation was particularly serious in coastal areas. Among them, the salt spray produced by the environment and the industrial waste gas in the heavy industrial area also have a serious corrosion effect on the busbar. In the substation, the busbar is an important component for the ...

Claims

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Application Information

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IPC IPC(8): C08G77/56C08L83/07C08L83/14C08L83/04C08K5/14C08K7/26C09J183/07C09J183/14C09J183/04C09J11/04C09J11/06
CPCC08G77/56C08L83/04C08L2205/025C08L2205/03C09J11/04C09J11/06C09J183/04C08L83/14C08K5/14C08K7/26
Inventor 冉祥海崔洪伟庄婷婷李冬威温诗渺
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI