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Method for enhancing adhesion of silicone rubber material

A silicone rubber and adhesive technology, applied in the direction of coating, etc., can solve the problems of high cost, complex molecular chain process of silicone rubber, affecting the excellent performance of silicone rubber, etc., and achieve the effect of low cost and simple preparation method

Inactive Publication Date: 2021-10-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of changing the molecular chain of silicone rubber is relatively complicated, the cost is high, and it greatly affects the excellent performance of silicone rubber.

Method used

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  • Method for enhancing adhesion of silicone rubber material
  • Method for enhancing adhesion of silicone rubber material
  • Method for enhancing adhesion of silicone rubber material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 0.2 g of cross-linking agent and 2 g of prepolymer of commercial PDMS (Dow Corning Sylgard 184) into a weighing bottle, stir well to completely disperse the cross-linking agent, and then put it in an oven at 100 °C to cure for 1 h obtains PDMS elastomer;

[0028] (2) Weigh boric acid (BA) and polydimethylsiloxane (PDMS-OH) with a molecular weight of 7.7 kg / mol, and add them to the weighing bottle according to the stoichiometric ratio of BA and PDMS-OH terminal hydroxyl groups as 1 , fully stirred to completely disperse the boric acid, and then put it into an oven for curing at 120 °C for 12 h to obtain a PBS elastomer;

[0029] (3) Add 10 wt% PBS prepolymer mixture to commercial PDMS, stir well, and then put it in an oven for curing at 120°C for 12 h to obtain PBS / PDMS elastomer.

Embodiment 2

[0031] (1) Oxidize the base material. That is to say, after the copper sheet with the size of 25.4 mm×101.6 mm×1 mm is polished with SiC sandpaper, it is washed with acetone and ionized water for 15 min and ultrasonically twice, and then dried with nitrogen, and the cleaned copper sheet is soaked in 30% hydrogen peroxide. 0.5 h in the middle. After the oxidation is finished, take out the copper sheet and dry it with nitrogen gas;

[0032] (2) Coat the uncured composite silicone rubber mixture of the PBS / PDMS in Example 1 on the front end of the copper sheet after the treatment in step (1) 25.4 mm×12.7 mm, and use polyimide (PI) tape Control the thickness to 200 μm to form a liquid thin layer. After removing air bubbles in a vacuum, another piece of copper was lapped on the liquid thin layer, and placed in a vacuum oven at 120 °C for 12 h to cure.

Embodiment 3

[0033] Example 3: Same as Example 2, the weight percentage of PBS in the composite silicone rubber mixture in step (2) is 20wt%.

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Abstract

The invention relates to a method for enhancing the adhesion of a silicone rubber material, in particular to a double-network structure formed by adding a small amount of boric acid and hydroxyl-containing polysiloxane in silicone rubber prepolymerization. In the invention, the preparation process method for improving the adhesive force of the silicone rubber and the base material is simple and efficient, the tackifying effect is higher than that of a traditional coupling agent, and the adhesive property can be controlled by changing the ratio of two network structures in the silicone rubber, so that the silicone rubber has targeted application. The silicone rubber adhesion system prepared by the method has universality to a base material containing hydroxyl groups on the surface or generating hydroxyl groups through surface oxidation, and can be popularized to other silicone rubber adhesion enhancing systems.

Description

technical field [0001] The invention relates to a method for enhancing the adhesiveness of silicone rubber materials. Background technique [0002] Silicone rubber is widely used due to its unique advantages such as excellent water resistance, weather resistance, biocompatibility, wide application temperature range, environmental friendliness, convenient use, room temperature curing and volume change after curing. It is widely used in medical and health care, electronic appliances, automobile, petrochemical, aerospace and other fields. At the same time, because there are few active polar groups connected to the main chain of silicone rubber -Si-O-Si-, it is difficult to form a good bond with most substrates, including metal substrates (aluminum, copper, iron, nickel , stainless steel, etc.) and non-metallic substrates (glass, quartz, polycarbonate, nylon, etc.). In order to improve the adhesion of silicone rubber to different substrates, it is mainly achieved through two a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D183/08
CPCC09D183/04C08L83/08
Inventor 李卓唐淼蒋卓
Owner FUDAN UNIV