A method for evaluating the structuring of methyl vinyl silicone rubber products

A technology of methyl vinyl silicon and product structure, applied in the direction of instruments, analytical materials, flow characteristics, etc., can solve the problems of reducing production efficiency, increasing labor intensity, and being unable to understand product quality in advance, achieving direct evaluation, Evaluate quickly and evaluate the effect of economy

Active Publication Date: 2018-01-12
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of testing the structure of raw rubber will only be reflected in the downstream application, which is not conducive to the timely adjustment of the processing formula, while increasing labor intensity and reducing production efficiency, and it is impossible to know the product quality in advance. Detection method

Method used

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  • A method for evaluating the structuring of methyl vinyl silicone rubber products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Pour 500 grams of DMC into a 1000ml beaker, weigh 50 grams of raw rubber sample A on aluminum foil, cut the raw rubber into small pieces, add it to DMC to dissolve, fix the sample cup under the stirrer, stir for 4 hours, and dissolve completely . Then take 250ml of the solution and pour it into a disposable water cup, place it in a 25°C incubator for 2 hours, set the Brookfield rotor viscometer speed at 20RPM, select the No. 2 rotor, test the viscosity of 309.6mPa.s, and then add 0.25g Vinyltrimethoxysilane and 0.15 g of dibutyltin dilaurate were sealed and stirred evenly, and placed in a thermostat at 25° C. for 1 hour. The viscosity was tested again to be 396.4 mPa.s, and the gelation viscosity ratio was 1.28. Mix 140g of raw rubber B, 70g of white carbon black, and 4.2g of hydroxy silicone oil on an open mill for 15 minutes, then heat-treat at 190°C for 3 hours, cool for 20 hours, and re-mill. The number of re-milling of this raw rubber is 14 times.

Embodiment 2

[0029] Pour 500 grams of DMC into a 1000ml beaker, weigh 25 grams of raw rubber sample A on aluminum foil, cut the raw rubber into small pieces, add it to DMC to dissolve, fix the sample cup under the stirrer, stir for 4 hours, and dissolve completely . Then take 250 ml of the solution and pour it into a disposable water cup, place it in a 25°C incubator for 2 hours, set the speed of Brookfield viscometer at 20RPM, select the No. 2 rotor, test the viscosity of 165.0mPa.s, and then add 0.25g Vinyltrimethoxysilane and 0.15 g of dibutyltin dilaurate were sealed and stirred evenly, and placed in a thermostat at 25° C. for 1 hour, and the viscosity was tested again to be 213.0 mPa.s, and the gelation viscosity ratio was 1.29. Mix 140g of raw rubber B, 70g of white carbon black, and 4.2g of hydroxy silicone oil on an open mill for 15 minutes, then heat-treat at 190°C for 3 hours, cool for 20 hours, and re-mill. The number of re-milling of this raw rubber is 14 times.

Embodiment 3

[0031] Pour 500 grams of DMC into a 1000ml beaker, weigh 100 grams of raw rubber sample A on aluminum foil, cut the raw rubber into small pieces, add to DMC to dissolve, fix the sample cup under the stirrer, stir for 4 hours, and dissolve completely . Then take 250 ml of the solution and pour it into a disposable water cup, place it in a 25°C incubator for 2 hours, set the speed of Brookfield viscometer at 20RPM, select the No. 2 rotor, test the viscosity of 388.6mPa.s, and then add 0.25g Vinyltriethoxysilane and 0.15 g of dibutyltin dilaurate were sealed and stirred evenly, and placed in a thermostat at 25°C for 1 hour. The viscosity was tested again to be 493.6 mPa.s, and the gelation viscosity ratio was 1.27. Mix 140g of raw rubber B, 70g of white carbon black, and 4.2g of hydroxy silicone oil on an open mill for 15 minutes, then heat-treat at 190°C for 3 hours, cool for 20 hours, and re-mill. The number of re-milling of this raw rubber is 14 times.

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Abstract

The invention relates to a method for evaluating structuralization of a methyl vinyl silicone rubber product. The method comprises the following steps: weighing methyl vinyl silicone rubber, adding methyl vinyl silicone rubber into dimethyl cyclosiloxane, stirring and dissolving until the sample is completely dissolved, pouring a solution into a beaker, placing the beaker into a constant temperature and humidity incubator, measuring dynamic viscosity u1 of the solution after temperature of the solution in the beaker reaches a set value, adding an adhesive and a catalyst, sealing and uniformly stirring, and measuring dynamic viscosity u2 of the solution in the above constant temperature and humidity incubator. Gelification viscosity ratio is u2 / u1. That is to say, gelification index reflects structuralization degree of the raw rubber product. A traditional method for examination of raw rubber structuralization comprises steps of mixing raw rubber, white carbon black and hydroxyl silicone oil by an open mill, carrying out heat treatment, cooling and remilling. Remilling frequency reflects structuralization degree of raw rubber. The method of the invention has advantages of simple evaluation operation, rapid evaluation speed and accurate evaluation result, and can be used to more visually evaluate product quality and more objectively guide clients to use the product.

Description

technical field [0001] The invention relates to a method for evaluating the application test of organic silicon rubber, in particular to a method for evaluating the structure of methyl vinyl silicone rubber products. technical background [0002] High temperature vulcanized silicone rubber (also known as heat vulcanized silicone rubber) is one of the important products of silicone materials. It is an elastomer made of high molar mass linear polysiloxane (referred to as raw silicon rubber), adding reinforcing fillers, various additives and vulcanizing agents, kneading evenly, and vulcanizing at high temperature. [0003] The main application forms of high temperature rubber are various vulcanized rubber products. Among them, most are molded products and extruded products. It is mainly used in the electrical and electronic industry, the automotive machinery industry and the sealing of daily products. According to incomplete statistics, the proportion of high-temperature glu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08L83/07C08K5/5425C08K5/5415C08K3/36G01N11/00
Inventor 李书兵陈建刚周治国颜昌锐王文金孙刚
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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