阅读说明：本技术 一种挤出型混炼硅橡胶的配方及制备方法 (formula and preparation method of extrusion type mixing silicone rubber ) 是由 吴承东 于 2018-05-30 设计创作，主要内容包括：本发明公开了一种挤出型混炼硅橡胶的配方,由如以下质量份数的原料制成：甲基乙烯基生胶190份、沉淀法白炭黑115份、聚丙烯10-15份、小分子量羟基硅油5-8份、促进剂TMTD1-4份、含氢硅油0.3-0.5份、内脱模剂0.4-0.9份和抗氧剂1-2份；本发明的挤出型混炼硅橡胶稳定性好,耐高温、抗氧化能力强,易定型,不粘结易脱模,可以很好的在挤压模具中挤出成型,使成型后的产品质量高,有利于生产硅橡胶产品,制备过程简单,易生产,生产效率高,以便于使用,便于推广。(The invention discloses a formula of extrusion type mixing silicone rubber, which is prepared from the following raw materials in parts by mass: 190 parts of methyl vinyl raw rubber, 115 parts of precipitated white carbon black, 10-15 parts of polypropylene, 5-8 parts of low molecular weight hydroxyl silicone oil, 0.3-0.5 part of accelerating agent TMTD1-4 parts of hydrogen-containing silicone oil, 0.4-0.9 part of internal mold release agent and 1-2 parts of antioxidant; the extrusion type mixing silicon rubber has good stability, high temperature resistance, strong oxidation resistance, easy shaping, no adhesion and easy demoulding, can be well extruded and molded in an extrusion die, ensures that the molded product has high quality, is beneficial to producing silicon rubber products, has simple preparation process, easy production and high production efficiency, is convenient to use and popularize.)

1. The formula of the extrusion type mixing silicone rubber is characterized by being prepared from the following raw materials in parts by mass: 190 parts of methyl vinyl raw rubber, 115 parts of precipitated white carbon black, 10-15 parts of polypropylene, 5-8 parts of low molecular weight hydroxyl silicone oil, 78-4 parts of accelerator TMTD1, 0.3-0.5 part of hydrogen-containing silicone oil, 0.4-0.9 part of internal mold release agent and 1-2 parts of antioxidant.

2. The formulation of claim 1, wherein the methyl vinyl raw rubber is prepared by mixing 100 parts of methyl vinyl raw rubber with a vinyl content of 0.16%, 87 parts of methyl vinyl raw rubber with a vinyl content of 0.23%, and 3 parts of methyl vinyl raw rubber with a vinyl content of 3%.

3. The formulation of an extruded compounded silicone rubber according to claim 1, wherein the precipitated silica is a mixture of two or more types of silica, and the silica is selected from ultra-fine silica having a large specific surface area.

4. the preparation method of the extrusion type mixing silicone rubber is characterized by comprising the following steps:

1) selecting 100 parts of methyl vinyl raw rubber with the molecular weight of 59-63 ten thousand and the vinyl content of 0.16%, 87 parts of methyl vinyl raw rubber with the molecular weight of 59-63 ten thousand and the vinyl content of 0.23%, and 3 parts of methyl vinyl raw rubber with the molecular weight of 59-63 ten thousand and the vinyl content of 3%, mixing and adding into a mixer, and mixing for 2-3 hours to prepare mixed methyl vinyl raw rubber for later use;

2) adding two or more than two kinds of superfine white carbon black with large specific surface area into a mixer, mixing for 2-3 hours to obtain precipitated white carbon black for later use;

3) Adding the prepared mixed methyl vinyl crude rubber, 10-15 parts of polypropylene, 10-4 parts of accelerator TMTD1-4 parts and 0.3-0.5 part of hydrogen-containing silicone oil into a kneader, vacuumizing by using another kneader until the negative pressure is 0.7-0.9MPa, and banburying at high temperature of 150 ℃ and 170 ℃ for 2-3 hours to prepare a mixed silicone rubber master batch;

4) And (2) placing and cooling the prepared mixed silicon rubber master batch after mixing the master batch out of the pot for 24 hours or more, then adding 115 parts of precipitated silica white prepared in the step 2), synchronously adding 5-8 parts of low molecular weight hydroxyl silicone oil in batches, adding the mixed silicon rubber master batch into the kneader again, vacuumizing by using another kneader until the negative pressure is 0.7-0.9MPa, carrying out high-temperature banburying at the temperature of 150 ℃ for 1-2 hours, then adding 0.4-0.9 part of internal mold release agent and 1-2 parts of antioxidant, continuously carrying out banburying for 2-3 hours, then placing and cooling for 24 hours or more, thus obtaining the extrusion type mixed silicon rubber.

Technical Field

the invention relates to a formula of extrusion type mixing silicone rubber, in particular to a formula of extrusion type mixing silicone rubber and a preparation method thereof, belonging to the technical field of preparation of extrusion type mixing silicone rubber.

Background

Silicone rubber refers to rubber having a backbone composed of alternating silicon and oxygen atoms, with the silicon atoms typically having two organic groups attached to them. Conventional silicone rubbers consist predominantly of siloxane segments containing methyl groups and small amounts of vinyl groups. The introduction of phenyl can improve the high and low temperature resistance of the silicone rubber, and the introduction of trifluoropropyl and cyano can improve the temperature resistance and oil resistance of the silicone rubber. The silicon rubber has good low-temperature resistance and can still work at the temperature of minus 55 ℃. After the introduction of phenyl, a temperature of-73 ℃ can be reached. The silicon rubber has outstanding heat resistance, can work for a long time at 180 ℃, can still have elasticity for a plurality of weeks or more even at the temperature slightly higher than 200 ℃, and can instantaneously resist the high temperature of more than 300 ℃. Silicone rubber has good gas permeability, and oxygen transmission rate is the highest among synthetic polymers. In addition, the silicon rubber also has the outstanding characteristics of physiological inertia and no coagulation, so the silicon rubber is widely applied in the medical field.

The silicone rubber is classified into a heat vulcanization type (high temperature vulcanized silicone HTV) and a room temperature vulcanization type (RTV), wherein the room temperature vulcanization type is also classified into a polycondensation reaction type and an addition reaction type. The high-temperature silicon rubber is mainly used for manufacturing various silicon rubber products, and the room-temperature silicon rubber is mainly used as an adhesive, a potting material or a mold. The heat vulcanization type is the most used, and the heat vulcanization type is divided into methyl silicone rubber (MQ), methyl vinyl silicone rubber (VMQ, the most used amount and product brand), methyl vinyl phenyl silicone rubber PVMQ (low temperature resistant and radiation resistant), other silicone rubber, fluorosilicone rubber and the like.

Disclosure of Invention

The invention provides a formula and a preparation method of extrusion type mixing silicone rubber, and solves the problems that in the prior art, silicone rubber has certain viscosity, is easy to oxidize, is not beneficial to extrusion molding, is easy to cause unstable shape of an extruded product, has poor cooling and shaping capabilities or is bonded in a mould, cannot be extruded and molded, is easy to oxidize, and has poor quality.

In order to solve the technical problems, the invention provides the following technical scheme:

The invention relates to a formula of extrusion type mixing silicone rubber, which is prepared from the following raw materials in parts by mass: 190 parts of methyl vinyl raw rubber, 115 parts of precipitated white carbon black, 10-15 parts of polypropylene, 5-8 parts of low molecular weight hydroxyl silicone oil, 78-4 parts of accelerator TMTD1, 0.3-0.5 part of hydrogen-containing silicone oil, 0.4-0.9 part of internal mold release agent and 1-2 parts of antioxidant.

in a preferred embodiment of the present invention, the raw methyl vinyl rubber is prepared by mixing 100 parts of raw methyl vinyl rubber having a vinyl content of 0.16%, 87 parts of raw methyl vinyl rubber having a vinyl content of 0.23%, and 3 parts of raw methyl vinyl rubber having a vinyl content of 3%.

As a preferred technical scheme of the invention, the precipitated silica is prepared by mixing two or more types of silica, and the silica is selected from ultrafine silica with large specific surface area.

A preparation method of extrusion type mixing silicone rubber comprises the following steps:

1) Selecting 100 parts of methyl vinyl raw rubber with the molecular weight of 59-63 ten thousand and the vinyl content of 0.16%, 87 parts of methyl vinyl raw rubber with the molecular weight of 59-63 ten thousand and the vinyl content of 0.23%, and 3 parts of methyl vinyl raw rubber with the molecular weight of 59-63 ten thousand and the vinyl content of 3%, mixing and adding into a mixer, and mixing for 2-3 hours to prepare mixed methyl vinyl raw rubber for later use;

2) Adding two or more than two kinds of superfine white carbon black with large specific surface area into a mixer, mixing for 2-3 hours to obtain precipitated white carbon black for later use;

3) Adding the prepared mixed methyl vinyl crude rubber, 10-15 parts of polypropylene, 10-4 parts of accelerator TMTD1-4 parts and 0.3-0.5 part of hydrogen-containing silicone oil into a kneader, vacuumizing by using another kneader until the negative pressure is 0.7-0.9MPa, and banburying at high temperature of 150 ℃ and 170 ℃ for 2-3 hours to prepare a mixed silicone rubber master batch;

4) and (2) placing and cooling the prepared mixed silicon rubber master batch after mixing the master batch out of the pot for 24 hours or more, then adding 115 parts of precipitated silica white prepared in the step 2), synchronously adding 5-8 parts of low molecular weight hydroxyl silicone oil in batches, adding the mixed silicon rubber master batch into the kneader again, vacuumizing by using another kneader until the negative pressure is 0.7-0.9MPa, carrying out high-temperature banburying at the temperature of 150 ℃ for 1-2 hours, then adding 0.4-0.9 part of internal mold release agent and 1-2 parts of antioxidant, continuously carrying out banburying for 2-3 hours, then placing and cooling for 24 hours or more, thus obtaining the extrusion type mixed silicon rubber.

The invention has the following beneficial effects: the extrusion type mixing silicon rubber has good stability, high temperature resistance, strong oxidation resistance, easy shaping, no adhesion and easy demoulding, can be well extruded and molded in an extrusion die, ensures that the molded product has high quality, is beneficial to producing silicon rubber products, has simple preparation process, easy production and high production efficiency, is convenient to use and popularize.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.