Preparation method of scorch retarder in accelerant medicine glue

Abstract

The invention discloses a preparation method of a scorch retarder in accelerant medicine glue, which comprises the following steps: preparation of a special scorch retarder for chloroprene rubber glue: weighing diphenylthiourea, styrene and 2-methylstyrene according to mass percentage, putting into a reaction container for reaction, controlling the temperature to be 80-90 DEG C, melting and uniformly mixing; adding the semi-reinforced soot in percentage by mass, uniformly mixing, and cooling to obtain a crude scorch retarder; before solid-liquid material separation of a crude product of the rubber scorch retarder, a sodium hydroxide solution is added, solid-liquid separation is performed after stirring reaction, and a finished product of the scorch retarder is obtained.The scorch retarder prepared through the preparation method of the scorch retarder effectively prolongs the scorching time and the storage period of chloroprene rubber adhesive; by prolonging the scorching time of the rubber compound, the problem that the rubber compound is easy to scorch in the processing processes of mixing, heating, calendaring, extruding, extruding and the like to cause the quality problem of the cured rubber of the rubber compound is solved.

Description

Technical Field

[0001] This invention relates to the technical field of anti-scorching materials, and particularly to a method for preparing an anti-scorching agent in an accelerator colloid. Background Technology

[0002] The rubber industry is one of the important basic industries of the national economy. Ordinary rubber products have low flame retardancy and are easy to burn, which greatly reduces their application range. In order to avoid scorching of the compound, the previous mixing process mainly used open mixing and kneading mixing. Generally, the discharge temperature of the compound is controlled not to exceed 110℃. Even if the mixing temperature is strictly controlled during the mixing process, the effect on extending the scorching time is not significant, and the prepared chloroprene rubber compound has a short shelf life. Summary of the Invention

[0003] The main technical problem solved by this invention is to provide a method for preparing an anti-scorching agent in accelerator-based rubber. The prepared anti-scorching agent effectively extends the scorching time and shelf life of chloroprene rubber. By extending the scorching time of the compound, the problem of scorching that easily occurs in the compound during processing such as mixing, hot refining, calendering, extrusion, and extrusion is solved, which causes quality problems in the cooked rubber compound.

[0004] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a method for preparing an anti-scorching agent in an accelerator colloid, comprising the following steps:

[0005] S1. Preparation of Chloroprene Rubber Special Anti-Scorching Agent: Weigh diphenylthiourea, styrene, and 2-methylstyrene according to the mass percentage, put them into a reaction vessel and react them, controlling the temperature at 80℃~90℃ to melt and mix them.

[0006] S2. Add a semi-reinforcing carbon soot by weight percentage, mix well, and cool to obtain crude anti-scorching agent;

[0007] S3. Before separating the solid and liquid materials of the crude rubber anti-scorching agent, add sodium hydroxide solution, stir and react, then separate the solid and liquid materials to obtain the finished anti-scorching agent.

[0008] In a preferred embodiment of the present invention, in step S1, the working temperature in the reaction vessel is 85°C and the reaction time is 30-50 min.

[0009] In a preferred embodiment of the present invention, the molar ratio of the crude anti-scorching agent to sodium hydroxide is 100:0.5 to 1.5.

[0010] In a preferred embodiment of the present invention, in step S3, the concentration of the sodium hydroxide solution is 10-20%.

[0011] In a preferred embodiment of the present invention, in step S3, the stirring reaction conditions are a rotation speed of 60-150 r / min and a stirring time of 30-60 min.

[0012] The beneficial effects of this invention are as follows: the anti-scorching agent prepared by compounding styrene, 2-methylstyrene, and semi-reinforcing soot effectively extends the scorch time and shelf life of chloroprene rubber; it is especially suitable for EPDM, NBR, and HNBR, significantly extending the scorch time without affecting the vulcanization speed. By extending the scorch time of the compound, it solves the problem of scorching that easily occurs in the compound during processing such as mixing, hot refining, calendering, extrusion, and extrusion, which causes quality problems in the cured compound. It improves production efficiency, does not cause pollution, does not change color, and can be used for light-colored products. It also increases the vulcanization crosslinking density of EPDM and NBR compounds, increases the tensile stress, and reduces permanent compression set. Detailed Implementation

[0013] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] This invention relates to a method for preparing an anti-scorching agent in an accelerator-based adhesive, comprising the following steps:

[0015] S1. Preparation of Chloroprene Rubber Special Anti-Scorching Agent: Weigh diphenylthiourea, styrene, and 2-methylstyrene according to the mass percentage, put them into a reaction vessel for reaction, the working temperature of the reaction vessel is 80℃~90℃, the reaction time is 30-50 min, and the mixture is melted and mixed.

[0016] S2. Add a semi-reinforcing carbon soot by weight percentage, mix well, and cool to obtain crude anti-scorching agent;

[0017] S3. Before solid-liquid separation of the crude rubber anti-scorching agent, add sodium hydroxide solution. The molar ratio of the crude anti-scorching agent to sodium hydroxide is 100:0.5-1.5. The concentration of the sodium hydroxide solution is 10-20%. The stirring reaction conditions are a speed of 60-150 r / min and a stirring time of 30-60 min. After stirring and reaction, solid and liquid are separated to obtain the finished anti-scorching agent. The prepared anti-scorching agent effectively extends the scorching time and storage period of chloroprene rubber. By extending the scorching time of the compound, it solves the problem of scorching that easily occurs in the compound during processing such as mixing, hot refining, calendering, extrusion, and extrusion, which causes quality problems in the cooked compound.

[0018] Example 1:

[0019] A method for preparing an anti-scorching agent in an accelerator adhesive includes the following steps:

[0020] 1. Preparation of chloroprene rubber special anti-scorching agent: Weigh diphenylthiourea, styrene, and 2-methylstyrene according to the mass percentage, put them into a reaction vessel for reaction, the working temperature of the reaction vessel is 85℃, the reaction time is 50 min, and the mixture is melted and mixed.

[0021] 2. Add a percentage of semi-reinforcing carbon soot and mix well. Cool to obtain crude anti-scorching agent. Before the solid-liquid separation of the crude rubber anti-scorching agent, add sodium hydroxide solution. The molar ratio of crude anti-scorching agent to sodium hydroxide is 100:0.5, and the concentration of sodium hydroxide solution is 10%. Stir the reaction at a speed of 100 r / min for 45 min. After stirring and solid-liquid separation, the finished anti-scorching agent is obtained.

[0022] Example 2:

[0023] A method for preparing an anti-scorching agent in an accelerator adhesive includes the following steps:

[0024] S1. Preparation of Chloroprene Rubber Special Anti-Scorching Agent: Weigh diphenylthiourea, styrene, and 2-methylstyrene according to the mass percentage, put them into a reaction vessel for reaction, the working temperature of the reaction vessel is 88℃, the reaction time is 45min, and the mixture is melted and mixed.

[0025] S2. Add a percentage of semi-reinforcing carbon soot and mix well. Cool to obtain crude anti-scorching agent. Before the solid-liquid separation of the crude rubber anti-scorching agent, add sodium hydroxide solution. The molar ratio of crude anti-scorching agent to sodium hydroxide is 100:1, and the concentration of sodium hydroxide solution is 18%. Stir the reaction at a speed of 120 r / min for 55 min. After stirring and solid-liquid separation, the finished anti-scorching agent is obtained.

[0026] Example 3:

[0027] A method for preparing an anti-scorching agent in an accelerator adhesive includes the following steps:

[0028] S1. Preparation of Chloroprene Rubber Special Anti-Scorching Agent: Weigh diphenylthiourea, styrene, and 2-methylstyrene according to the mass percentage, put them into a reaction vessel for reaction, the working temperature of the reaction vessel is 90℃, the reaction time is 45min, and the mixture is melted and mixed.

[0029] S2. Add a percentage of semi-reinforcing carbon soot and mix well. Cool to obtain crude anti-scorching agent. Before the solid-liquid separation of the crude rubber anti-scorching agent, add sodium hydroxide solution. The molar ratio of crude anti-scorching agent to sodium hydroxide is 100:1.5, and the concentration of sodium hydroxide solution is 20%. Stir the reaction at a speed of 150 r / min for 60 min. After stirring and solid-liquid separation, the finished anti-scorching agent is obtained.

[0030] In summary, the present invention discloses a method for preparing an anti-scorching agent in accelerator-based rubber. By compounding styrene, 2-methylstyrene, and semi-reinforcing soot, the resulting anti-scorching agent effectively extends the scorch time and shelf life of chloroprene rubber. It is particularly suitable for EPDM, NBR, and HNBR, significantly extending the scorch time without affecting the vulcanization rate. By extending the scorch time of the compound, it solves the problem of scorching that easily occurs during the compounding, hot refining, calendering, extrusion, and other processing steps, which causes quality problems in the cured rubber. It improves production efficiency, does not cause pollution, does not discolor, and can be used for light-colored products. It also increases the vulcanization crosslinking density of EPDM and NBR rubber compounds, increases the tensile stress, and reduces permanent compression set.

[0031] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing an anti-scorching agent in an accelerator-based colloid, characterized in that, Includes the following steps: S1. Preparation of Chloroprene Rubber Special Anti-Scorching Agent: Weigh diphenylthiourea, styrene, and 2-methylstyrene according to the mass percentage, put them into a reaction vessel and react them, controlling the temperature at 80℃~90℃ to melt and mix them. S2. Add a semi-reinforcing carbon soot by weight percentage, mix well, and cool to obtain crude anti-scorching agent; S3. Before separating the solid and liquid materials of the crude rubber anti-scorching agent, add sodium hydroxide solution, stir and react, then separate the solid and liquid materials to obtain the finished anti-scorching agent.

2. The method for preparing the anti-scorching agent in the accelerator colloid according to claim 1, characterized in that, In step S1, the working temperature in the reaction vessel is 85°C, and the reaction time is 30-50 min.

3. The method for preparing the anti-scorching agent in the accelerator colloid according to claim 1, characterized in that, The molar ratio of the crude anti-scorching agent to sodium hydroxide is 100:0.5 to 1.

5.

4. The method for preparing the anti-scorching agent in the accelerator colloid according to claim 1, characterized in that, In step S3, the concentration of the sodium hydroxide solution is 10-20%.

5. The method for preparing the anti-scorching agent in the accelerator colloid according to claim 1, characterized in that, In step S3, the stirring reaction conditions are a rotation speed of 60–150 r / min and a stirring time of 30–60 min.