阅读说明：本技术 一种橡胶成型的方法 (Rubber molding method ) 是由 高静静 于 2019-10-16 设计创作，主要内容包括：本发明提出了一种橡胶成型的方法,包括橡胶交联反应工序、气相辅助注射成型工序以及浸渍工序。本发明将交联反应和注射成型一体完成,制得的橡胶成品在成型机里,避免的中间环节引起的橡胶性能不均匀,制得的橡胶具有较高的力学性能、强度和较低的玻璃化温度。注射热塑性橡胶时,由于胶料冷却时体积收缩会导致肋、凸台等部位出现凹坑、缩痕,将气体的压力均匀地施加于胶料上,从而补偿了胶料冷却时所产生的体积收缩,避免了凹坑、缩痕等缺陷,因此具有广泛的应用前景。(The invention provides a rubber molding method, which comprises a rubber crosslinking reaction process, a gas-phase auxiliary injection molding process and an impregnation process. The invention completes the crosslinking reaction and the injection molding integrally, and the prepared rubber finished product has uneven rubber performance caused by intermediate links in a molding machine, and the prepared rubber has higher mechanical property, strength and lower glass transition temperature. When the thermoplastic rubber is injected, because pits and sink marks appear on the positions such as ribs, bosses and the like due to volume shrinkage of the rubber material when the rubber material is cooled, the pressure of gas is uniformly applied to the rubber material, so that the volume shrinkage generated when the rubber material is cooled is compensated, the defects such as the pits and the sink marks are avoided, and the thermoplastic rubber has a wide application prospect.)

1. A method for molding rubber is characterized by comprising a rubber crosslinking reaction process, a gas-phase auxiliary injection molding process and an impregnation process.

2. The method for molding rubber according to claim 1, comprising the following steps:

s1, rubber crosslinking reaction: filling inert gas into an injection molding machine, adding a cross-linking agent, rubber and a cross-linked substance, controlling the temperature to be 80-120 ℃, and reacting for a certain time;

s2, gas-phase auxiliary injection molding: continuously filling high-pressure inert gas into the injection molding machine, injecting a sizing material core layer, pushing the sizing material to fill the mold cavity, gradually cooling and molding the product under the action of uniform gas pressure, discharging the gas, and then opening the mold;

s3, dipping: and (3) soaking the formed rubber in clear water for a certain time to obtain the rubber.

3. A method of rubber moulding according to claim 2 wherein said rubber is one of viton rubber, silicone rubber, neoprene rubber, ethylene propylene rubber, butadiene rubber, isoprene rubber, styrene butadiene rubber and nitrile butadiene rubber.

4. A method of rubber moulding according to claim 2 wherein said inert gas is argon or nitrogen.

5. A method of molding rubber according to claim 2, wherein the high pressure is 1.6 to 4.0 MPa.

6. A method of molding rubber according to claim 2, wherein the crosslinking agent is an organic peroxide crosslinking agent.

7. A method for molding rubber according to claim 6, wherein the organic peroxide crosslinking agent is one or more selected from the group consisting of dicumyl peroxide, benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, 2, 5-dimethyl-2, 5-di-t-butyl hexane peroxide, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-isopropylimidazole, tetra-gas phthalic anhydride, hexahydrophthalic anhydride, triethylenetetramine, dimethylaminopropylamine and diethylaminopropylamine.

8. A method of molding rubber according to claim 2, wherein the injection molding machine is a screw-ram injection molding machine.

9. A rubber product obtained by the production method according to any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of rubber preparation, in particular to a rubber molding method.

Background

The common silicone rubber molding in the market is generally formed by 100% silicone rubber, and later, the silicone rubber is gradually developed to be integrally formed with other materials such as plastic, glass, metal and the like. The forming method can change the strength of the silicon rubber and make the silicon rubber have rigidity, but the combination of metal, plastic, glass and the silicon rubber is only surface adhesion, the silicon rubber is easy to be peeled off under the action of external force, and the plastic, the metal and the glass are all hard materials, and parts formed by the plastic, the metal and the glass and the silicon rubber in an integrated mode are mostly used for manufacturing some structural parts or parts heated by stress, and the silicon rubber is not suitable for being used as decorative parts due to hard texture, so that the defect greatly limits the expansion of the application field of the silicon rubber.

Disclosure of Invention

In order to solve the technical problems, the invention provides a rubber molding method, which aims to avoid the problems of uneven rubber performance caused by intermediate links and poor products of pits and sink marks at positions such as ribs and bosses by integrally completing crosslinking reaction and injection molding, and the prepared rubber product has high performance.

The invention provides a rubber molding method, which comprises a rubber crosslinking reaction process, a gas phase auxiliary injection molding process and an impregnation process.

As a further improvement of the invention, the method specifically comprises the following steps:

s1, rubber crosslinking reaction: filling inert gas into an injection molding machine, adding a cross-linking agent, rubber and a cross-linked substance, controlling the temperature to be 80-120 ℃, and reacting for a certain time;

s2, gas-phase auxiliary injection molding: continuously filling high-pressure inert gas into the injection molding machine, injecting a sizing material core layer, pushing the sizing material to fill the mold cavity, gradually cooling and molding the product under the action of uniform gas pressure, discharging the gas, and then opening the mold;

s3, dipping: and (3) soaking the formed rubber in clear water for a certain time to obtain the rubber.

As a further improvement of the invention, the rubber is one of fluororubber, silicon rubber, chloroprene rubber, ethylene propylene rubber, butadiene rubber, isoprene rubber, styrene butadiene rubber and nitrile butadiene rubber.

As a further improvement of the invention, the inert gas is argon or nitrogen.

As a further improvement of the invention, the pressure of the high pressure is 1.6-4.0 MPa.

As a further improvement of the invention, the crosslinking agent is an organic peroxide crosslinking agent.

As a further improvement of the invention, the organic peroxide crosslinking agent is selected from one or more of dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide, dicumyl peroxide, 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-isopropylimidazole, tetra-gas phthalic anhydride, hexahydrophthalic anhydride, triethylenetetramine, dimethylaminopropylamine and diethylaminopropylamine.

As a further improvement of the invention, the injection molding machine is a screw-ram injection molding machine.

The invention further protects a rubber finished product prepared by the preparation method.

The invention has the following beneficial effects:

1. the invention has wide application range, can carry out integrated crosslinking molding on most rubber materials by adopting the method, and saves working procedures;

2. the invention completes the crosslinking reaction and the injection molding integrally, and the prepared rubber finished product has uneven rubber performance caused by intermediate links in a molding machine, and the prepared rubber has higher mechanical property, strength and lower glass transition temperature. When the thermoplastic rubber is injected, because pits and sink marks appear on the positions such as ribs, bosses and the like due to volume shrinkage of the rubber material when the rubber material is cooled, the pressure of gas is uniformly applied to the rubber material, so that the volume shrinkage generated when the rubber material is cooled is compensated, the defects such as the pits and the sink marks are avoided, and the thermoplastic rubber has a wide application prospect.

Drawings

FIG. 1 is a process diagram of rubber molding according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the embodiments described are only some representative embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.