Vulcanization method of addition silicone rubber

A silicone rubber, addition molding technology, applied in the field of polymer materials, can solve the problems of hard rubber, affecting the physical properties of the rubber, easy to break and brittle crack, etc., to reduce the vulcanization temperature, improve the production efficiency, and improve the vulcanization rate. Effect

Active Publication Date: 2019-06-25
NANTONG MEMTECH TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using a large amount of peroxide crosslinking agent or silicon hydride crosslinking agent in addition silicone rubber may increase the vulcanization speed of addition silicone rubber, but it is likely to significantly affect the physical properties of the rubber compound, such as hardness and tensile strength. Strength, elongation at break and tear strength, when these crosslinking agents are added in too much, it can even make the rubber hard, easy to break and brittle

Method used

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  • Vulcanization method of addition silicone rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this example, addition type liquid silicone rubber CNH-LIMS-40A (component A) and CNH-LIMS-40B (component B) produced by Shin-Etsu Co., Ltd. are used. The liquid silicone rubber is divided into two components, A and B. Among them, in addition to the rubber base, component A also contains platinum-based catalysts and other substances, and component B contains not only the rubber base, but also cross-linking agents such as hydrogen-containing silicone oil. Take two components A and B of equal weight, and take 0.5% of the total weight of the two components A and B ammonia water with a concentration of 25% to 28%, and mix A component, B component and ammonia water evenly. First use a rotorless vulcanizer to measure its vulcanization curve at 110°C, and measure its positive vulcanization time T90 to be 80s, then use a flat vulcanizing agent to vulcanize under pressure at 110°C, and the vulcanization time is 80s to obtain a standard hardness block with a thickness of 6mm. ...

Embodiment 2

[0029] The making of sizing material is the same as implementing 1. However, the vulcanization condition for preparing standard hardness blocks was 100°C×140s. It was found that the Shore A hardness of the vulcanized rubber added with ammonia water was 40, and the surface was dry. However, the Shore A hardness of the vulcanizate of the comparison compound without adding ammonia water is only 31, and the surface is not dry, which is characterized by sulfur deficiency.

[0030] Example 2 shows that adding ammonia water can properly reduce the vulcanization temperature.

Embodiment 3

[0032] Take 100g each of CNH-LIMS-40A and CNH-LIMS-40B, put them in glass crystallization dishes with a diameter of 150mm respectively, and put the glass crystallization dishes in a glass vacuum desiccator (no need to vacuum, use this kind of glassware, just for It is convenient for the drying chamber in the glass vacuum desiccator to communicate with and close with the outside world).

[0033] Treatment of liquid silicone rubber with ammonia gas: Keep the glass vacuum desiccator open to the outside world. Put 2g to 5g of liquid ammonia in the desiccator, cover the lid of the desiccator, and close the desiccator when the liquid ammonia in the desiccator evaporates completely. After standing for 48 hours, mix the two components evenly, and then test the vulcanization curve and the hardness of the vulcanized rubber.

[0034] The obtained results are similar to those of Example 1. Compared with the liquid silicone rubber not treated with ammonia gas, the liquid silicone rubber t...

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Abstract

The invention discloses a vulcanization method of addition silicone rubber. Ammonia is a common well-supplied and low-cost inorganic compound, and ammonia gas is introduced into water to obtain ammonia water. Some carbon dioxide is introduced into the ammonia water to obtain carbonized ammonia water. The addition type silicone rubber is synthetic rubber which is vulcanized by hydrosilylation reaction to form a cross-linked network. According to the method, the ammonia, the ammonia water, the carbonized ammonia water or liquid ammonia is added into the addition silicone rubber to change the vulcanization characteristic of the addition silicone rubber, the vulcanization rate of the addition silicone rubber is increased by the method, the vulcanization temperature is reduced, the vulcanization time is shortened, the production efficiency is improved, and meanwhile, the method facilitates hot vulcanization compound molding of silicon rubber and low softening point materials (such as thermoplastic ABS, PMMA, PC / ABS and PC).

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a vulcanization method of addition-type silicone rubber, which uses ammonia to increase the vulcanization rate of the addition-type silicone rubber or reduce the vulcanization temperature of the addition-type silicone rubber. Background technique [0002] Addition-type silicone rubbers that use compounds containing platinum or rhodium as curing catalysts have good curing properties. Addition silicone rubber can be solid or liquid before curing, so it can be used for various purposes, such as adhesives, molded products, injection molded products, hoses, films, etc. [0003] Addition silicone rubbers, whether solid or liquid, usually contain curing retardants (hydrosilylation inhibitors) to ensure storage stability and cure by heating. In this case, heating at elevated temperature can accelerate the vulcanization reaction. However, in some cases (for example, co-moldi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L83/04C08L83/07B29C35/02
Inventor 韩辉升张雪丁阳张红梅黄诚王健周怡君戴挺
Owner NANTONG MEMTECH TECH
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