阅读说明：本技术 一种密封胶组合物及其制备方法 (Sealant composition and preparation method thereof ) 是由 李俊 鲍俊瑶 毛旺龙 张文强 袁良鹏 赵旭 于 2019-12-09 设计创作，主要内容包括：本发明公开了一种密封胶组合物及其制备方法,属于密封胶领域,包括以下重量份的原料：丁腈橡胶50-75份、顺丁橡胶23-53份、蛭石粉12-18份、纳米级碳酸钙15-25份、环氧树脂3-8份、氧化锌4-10份、硬脂酸11-15份、分散剂1-3份、消泡剂1-3份、阻燃剂1-3份。本发明所述的密封胶组合物可以增强密封胶的耐热性、耐磨性、耐寒性。(The invention discloses a sealant composition and a preparation method thereof, belonging to the field of sealants and comprising the following raw materials in parts by weight: 50-75 parts of nitrile rubber, 23-53 parts of butadiene rubber, 12-18 parts of vermiculite powder, 15-25 parts of nano calcium carbonate, 3-8 parts of epoxy resin, 4-10 parts of zinc oxide, 11-15 parts of stearic acid, 1-3 parts of a dispersing agent, 1-3 parts of a defoaming agent and 1-3 parts of a flame retardant. The sealant composition provided by the invention can enhance the heat resistance, wear resistance and cold resistance of the sealant.)

1. The sealant composition is characterized by comprising the following raw materials in parts by weight: 50-75 parts of nitrile rubber, 23-53 parts of butadiene rubber, 12-18 parts of vermiculite powder, 15-25 parts of nano calcium carbonate, 3-8 parts of epoxy resin, 4-10 parts of zinc oxide, 11-15 parts of stearic acid, 1-3 parts of a dispersing agent, 1-3 parts of a defoaming agent and 1-3 parts of a flame retardant.

2. The sealant composition of claim 1, comprising the following raw materials in parts by weight: 63 parts of nitrile rubber, 40 parts of butadiene rubber, 15 parts of vermiculite powder, 20 parts of nano calcium carbonate, 5 parts of epoxy resin, 7 parts of zinc oxide, 13 parts of stearic acid, 2 parts of a dispersing agent, 2 parts of a defoaming agent and 2 parts of a flame retardant.

3. A sealant composition according to claim 1, wherein: the dispersant is stearic acid monoglyceride.

4. A sealant composition according to claim 1, wherein: the defoaming agent is an organic silicon defoaming agent.

5. A sealant composition according to claim 4, wherein: the defoaming agent is an S4800 defoaming agent.

6. A sealant composition according to claim 1, wherein: the flame retardant comprises aluminum hydroxide and antimony trioxide, and the mass ratio of the aluminum hydroxide to the antimony trioxide is 3: 2.

7. The process for preparing a sealant composition according to any one of claims 1 to 6, comprising the steps of:

(1) dehydrating and kneading nitrile rubber, butadiene rubber, epoxy resin, zinc oxide and stearic acid for 1-3 hours under a vacuum condition to obtain a pretreated material, then adding vermiculite powder and nano calcium carbonate, and continuously dehydrating and kneading for 1-3 hours under the vacuum condition to obtain a base material;

(2) and (3) defoaming the base material under a vacuum condition, adding a dispersing agent, a defoaming agent and a flame retardant, and uniformly mixing under the vacuum condition to obtain the sealant composition.

Technical Field

The invention relates to the field of sealants, in particular to a sealant composition and a preparation method thereof.

Background

The sealant is a sealing material which deforms along with the shape of the sealing surface, is not easy to flow and has certain cohesiveness. Is an adhesive used to fill the configured gap for sealing purposes. Has the functions of leakage prevention, water prevention, vibration prevention, sound insulation, heat insulation and the like. It is made up by using dry or non-dry viscous material of asphalt, natural resin or synthetic resin, natural rubber or synthetic rubber, etc. as base material, adding inert fillers of talcum powder, clay, carbon black, titanium white powder and asbestos, etc. and adding plasticizer, solvent, solidifying agent and accelerator. Can be divided into three categories of elastic sealant, liquid sealing gasket and sealing putty. It is widely used for sealing building, transportation, electronic instrument and meter and parts. The currently used sealant is often damaged due to overhigh temperature, cracks and flows are generated at high temperature to influence the sealing performance of the vacuum bag, and the burden of cleaning the mold is increased due to more residual glue during demolding.

Disclosure of Invention

The invention aims to provide a sealant composition and a preparation method thereof, and the prepared sealant composition can enhance the heat resistance of a sealant.

In order to achieve the purpose, the invention provides the following technical scheme:

the sealant composition comprises the following raw materials in parts by weight: 50-75 parts of nitrile rubber, 23-53 parts of butadiene rubber, 12-18 parts of vermiculite powder, 15-25 parts of nano calcium carbonate, 3-8 parts of epoxy resin, 4-10 parts of zinc oxide, 11-15 parts of stearic acid, 1-3 parts of a dispersing agent, 1-3 parts of a defoaming agent and 1-3 parts of a flame retardant.

Preferably, the sealant composition comprises the following raw materials in parts by weight: 63 parts of nitrile rubber, 40 parts of butadiene rubber, 15 parts of vermiculite powder, 20 parts of nano calcium carbonate, 5 parts of epoxy resin, 7 parts of zinc oxide, 13 parts of stearic acid, 2 parts of a dispersing agent, 2 parts of a defoaming agent and 2 parts of a flame retardant.

Preferably, the dispersant is glycerol monostearate.

Preferably, the defoaming agent is a silicone-based defoaming agent.

Preferably, the defoamer is a S4800 defoamer.

Preferably, the flame retardant comprises aluminum hydroxide and antimony trioxide, and the mass ratio of the aluminum hydroxide to the antimony trioxide is 3: 2.

Preferably, the sealant composition and the preparation method thereof comprise the following steps:

(1) dehydrating and kneading nitrile rubber, butadiene rubber, epoxy resin, zinc oxide and stearic acid for 1-3 hours under a vacuum condition to obtain a pretreated material, then adding vermiculite powder and nano calcium carbonate, and continuously dehydrating and kneading for 1-3 hours under the vacuum condition to obtain a base material;

(2) and (3) defoaming the base material under a vacuum condition, adding a dispersing agent, a defoaming agent and a flame retardant, and uniformly mixing under the vacuum condition to obtain the sealant composition.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the nitrile rubber and the butadiene rubber are added, so that the heat resistance, the wear resistance and the cold resistance of the sealant can be enhanced. By adding the vermiculite powder and the nano calcium carbonate, the crosslinking reaction of the adhesive can be accelerated, the thixotropy of a system is greatly improved, the stability is enhanced, the mechanical property of the sealant is improved, the dual effects of filling and reinforcing are achieved, and meanwhile, the surface of the adhesive material can be bright and fine.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.