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Production technology of methyl vinyl silicon rubber

A methyl vinyl silicon and production process technology, applied in the field of organic chemistry, can solve the problems of easy cross-linking of high vinyl raw rubber, unstable vinyl, wide molecular weight distribution, etc. Transparency, narrow molecular weight distribution effect

Active Publication Date: 2017-09-12
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a production process of high-transparency high-vinyl methyl vinyl silicone rubber, which solves the problems of easy crosslinking of high-vinyl raw rubber, unstable vinyl, wide molecular weight distribution, yellow appearance, etc., and produces vinyl content of 5 %~10% raw rubber

Method used

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  • Production technology of methyl vinyl silicon rubber
  • Production technology of methyl vinyl silicon rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] VMC was dehydrated by nitrogen bubbling at a temperature of 125°C and a vacuum of -0.10 MPa. After cooling, it was treated with molecular sieves for 5 days before use. VM was treated with molecular sieves for 7 days before use.

[0019] The dimethylsiloxane mixed ring is filtered through a filter membrane of 0.22um, activated carbon 7kg, and a filter bag with a pore size of 0.5um; the filtered DMC is dehydrated in a dehydration kettle at a dehydration temperature of 100°C and a vacuum of -0.06 MPa, nitrogen bubbling rate 1L / h, dehydration time 3h, dehydration amount 7%.

[0020] Polymerize the treated DMC, VMC, VM, and catalyst at 98°C according to the mass ratio of 100:5.58:0.05:0.02, equilibrate for 5 hours, and the equilibrium temperature is 114°C; the temperature of the balanced material when it reaches the low molecular weight device is 133°C, the temperature is 143°C after flowing through the first section of the tube, and the temperature rises to 153°C after pass...

Embodiment 2

[0022] The VMC was dehydrated by nitrogen bubbling under the conditions of temperature 125°C and vacuum degree -0.09MPa, cooled and treated with molecular sieves for 3 days before use. VMs were treated with molecular sieves for 5 days before use.

[0023] The dimethylsiloxane mixed ring is filtered through a filter membrane of 0.5um, an overlapping filter of 5kg of activated carbon, and a filter bag with a pore size of 0.1um; the filtered DMC is dehydrated in a dehydration kettle at a dehydration temperature of 100°C and a vacuum of -0.07 MPa, nitrogen bubbling rate 2L / h, dehydration time 2.5h, dehydration amount 8%.

[0024] Polymerize the treated DMC, VMC, VM, and catalyst at 95°C according to the mass ratio of 100:10:0.05:0.02, equilibrate for 6 hours, and reach the equilibrium temperature of 115°C; the temperature of the balanced material when it reaches the delowering device is 134°C, the temperature is 141°C after flowing through the first section of tubes, and the temp...

Embodiment 3

[0026] The dimethylsiloxane mixed ring is filtered through a filter bag with a pore size of 1.0um; the filtered DMC and VMC are dehydrated in a dehydration kettle at a dehydration temperature of 85°C, a vacuum of -0.10MPa, and a nitrogen bubbling rate of 15L / h. Time 3h, dehydration 7%;

[0027] Polymerize DMC, VMC, VM, and catalyst at 110°C according to the mass ratio of 100:5.58:0.05:0.02, equilibrate for 4 hours, and reach an equilibrium temperature of 110°C; After the second-stage tube arrangement, the temperature was raised to 165°C; after de-lowering, unqualified high vinyl methyl vinyl silicone rubber was obtained. VMC and DMC were dehydrated at the same time, and the water content was 35ppm; VM was not treated, and the water content was 138ppm. The raw rubber has a yellowish appearance, a transparency of 84%, a vinyl content of 4.890%, a molecular weight of 67W, Mz / Mw=1.3521, and is partially insoluble in toluene.

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Abstract

The invention relates to a production technology of high-transparency and high-vinyl methyl vinyl silicon rubber. The production technology comprises the following steps of performing primary filtering and fine filtering on DMC, so as to remove colored impurities including iron rust and the like; removing impurities from auxiliary materials, VMC and divinyltetramethyldisiloxane through vacuum bubble dehydration and physical dynamic adsorption; using a high-temperature and low-pressure dehydration technology, adding the dehydrated material into a polymerizing kettle, adding a catalyst, VMC and a termination sealing agent to polymerize, and balancing after the polymerizing is completed; preheating the balanced rubber material, and then sending into a low molecule removal device to remove low molecule and produce the rubber. The production technology has the advantages that the problems of easiness in crosslinking and broad distribution of molecular weight in the high-vinyl raw rubber are solved; in the low molecule removal process, the gradual heating manner is adopted, and the problems of falling and crosslinking of vinyl, instability of vinyl content, slight yellowing of a product and the like due to continuous high temperature of local part in the raw rubber production heating process are solved.

Description

technical field [0001] The invention relates to a production process of high-transparency high-vinyl methyl vinyl silicone rubber, belonging to the technical field of organic chemistry. technical background [0002] Methyl vinyl silicone rubber is obtained by ring-opening polymerization of dimethylsiloxane mixed ring body or octamethylcyclotetrasiloxane, vinyl ring body and end-capping agent at a certain temperature by catalyst catalysis, referred to as Raw rubber. [0003] Raw rubber, reinforcing agent and other auxiliary materials are prepared into mixed rubber under certain conditions, and various silicone rubber elastic products are obtained under vulcanizing agent, certain temperature and pressure conditions. Silicone rubber products have good physiological inertia and are widely used in aviation and aerospace. , instrumentation, medicine, food and power industries have a wide range of applications. [0004] The vinyl content of raw rubber determines the crosslinking ...

Claims

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Application Information

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IPC IPC(8): C08G77/20C08G77/06
CPCC08G77/06C08G77/20
Inventor 李书兵孙刚陈泽雨周治国王义敏张光荣
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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