Linear shrinking percentage test method for room temperature vulcanization of liquid silicone rubber

A technology of liquid silicone rubber and linear shrinkage, applied in the direction of material inspection products, etc., can solve the problems of mold size limitation, poor repeatability, insufficient stability, etc., and achieve good repeatability

Active Publication Date: 2013-12-18
兆舜科技(广东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the movement of the sample, the obtained data is not accurate enough, the test method is not stable enough, the repeatability is poor, and the size of the mold is limited

Method used

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  • Linear shrinking percentage test method for room temperature vulcanization of liquid silicone rubber
  • Linear shrinking percentage test method for room temperature vulcanization of liquid silicone rubber
  • Linear shrinking percentage test method for room temperature vulcanization of liquid silicone rubber

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Embodiment 1

[0046] A method for testing the linear shrinkage rate of liquid silicone rubber room temperature vulcanization, comprising the steps of:

[0047] ①Choose liquid silicone rubber, that is, an appropriate amount of A glue, and then choose B glue, mix and stir evenly, put it into a vacuum defoaming box for 2 to 5 minutes, and put such figure 1 The mold 3 shown is coated with release agent and blown dry with a blower, then pour the defoamed glue into it, scrape the surface of the mold with a scraper, and make the glue level evenly, without pits on the surface, place In a space with a constant temperature of 20-35°C; the test bench where the mold 3 is placed must be horizontal and cannot be tilted;

[0048] Select at least 3 groups of samples, and take different additions of B glue.

[0049]②After 12 to 18 hours of storage, the glue has cured and is not sticky. Gently lift it from the end without fixing holes to the position with holes, but do not destroy the position where the glu...

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Abstract

The invention relates to a linear shrinking percentage test method for room temperature vulcanization of liquid silicone rubber. The method is characterized in that a mold is provided with a placement trough for placing the rubber, wherein positioning holes are formed in one end of the placement trough. According to the method, the positioning holes are formed in one end of the placement trough, so that solidified liquid silicone rubber is lightly lifted up from one end, which is not provided with the positioning hole, of the placement trough to the positions of the positioning holes after the liquid silicone rubber is solidified, then is flatly placed in the placement trough and is subjected to length width measurement, and the length and the width of the liquid silicone rubber are compared with the length and the width of the placement trough and are calculated to obtain the linear shrinking percentage. The test method provided by the invention meets the selection requirement of mold opening and can be adaptive to the requirements of the molds with different sizes; an obtained result is good in repeatability, the evaluation is accordant with the requirement of the mold; the test method has a positive guiding function to the production and is worthy of major popularization.

Description

technical field [0001] The invention relates to a method for testing linear shrinkage of liquid silicone rubber at room temperature. Background technique [0002] Dimensional stability is an important indicator to measure the quality of liquid silicone rubber. A more accurate evaluation can be made by measuring the linear shrinkage of liquid silicone rubber. [0003] Since the liquid silicone rubber will release a small amount of alcohol and other low-molecular substances during the vulcanization process, it will shrink after vulcanization, resulting in a change in size. [0004] The conventional linear shrinkage measurement method is to make a 50cm×1cm×0.5cm cuboid mold with plexiglass, fill it with liquid silicone rubber A glue and B glue, take it out after vulcanization is complete, and accurately measure its length L 0 ; Then put the sample strip in an oven at 100°C for 24 hours, take it out, cool it to room temperature, and measure the length L at this time accurately...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/44
Inventor 张亚林林旭锋蓝春霞
Owner 兆舜科技(广东)有限公司
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