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Pre-dispersed masterbatch formula and preparation method thereof

A technology for pre-dispersed master batches and formulations, applied in the field of rubber additives and their preparation, can solve the problems of harming the health of employees, harming the health of operators, easy to agglomerate and difficult to disperse, etc. It can solve the problems of large measurement error and fast vulcanization speed , the effect of simple formula

Inactive Publication Date: 2019-12-13
NINGBO ACTMIX POLYMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tetrahydro-2(1H)-pyrimidinethione is a white powder, although it can bring great benefits to rubber products, but in the process of rubber products, there are technical problems such as sticking rolls, flying dust, easy to agglomerate and difficult to disperse , while endangering the health of employees and causing inaccurate measurement
However, N, N-ethylene thiourea, as a rubber accelerator, will produce carcinogenic nitrosamines during the vulcanization process, which will pollute the environment and endanger the health of operators.

Method used

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  • Pre-dispersed masterbatch formula and preparation method thereof
  • Pre-dispersed masterbatch formula and preparation method thereof
  • Pre-dispersed masterbatch formula and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0022] Described preparation method comprises the steps:

[0023] Step 1. Accurately weigh the raw materials required for the rubber carrier according to the weight ratio of EPDM rubber, EPDM rubber and stearic acid in the range of 8 to 11:1 to 5:1. Rubber and binary ethylene propylene rubber are put into an internal mixer for mixing, and then stearic acid is added for mixing. On the open mill, a sheet-shaped rubber carrier with a thickness of 2 to 20 mm is made.

[0024] Step 2. Accurately weigh each raw material required for the rubber vulcanizing agent according to the proportion; put each raw material into an internal mixer, and mix for 2-10 minutes at a temperature of 80-85° C. and a rotational speed of 55-60 rpm to obtain a rubber compound.

[0025] Step 3. Put the rubber material obtained in step (2) into the extruder, control the given speed of the main engine to be 115-125r / min, and finally extrude to obtain tetrahydro-2(1H)-pyrimidinethione pre-dispersed masterbatch ...

Embodiment 1

[0030] The preparation method of embodiment one, embodiment two and embodiment five is consistent, comprises the steps:

[0031] Step 1. Accurately weigh the raw materials required for the rubber carrier according to the weight ratio of EPDM rubber, binary ethylene propylene rubber and stearic acid of 10:3:1, first mix EPDM rubber, binary ethylene propylene rubber, The ethylene-propylene rubber is put into the internal mixer for mixing, and then stearic acid is added for mixing. On the open mill, a sheet rubber carrier with a thickness of 3mm is made.

[0032] Step 2. Accurately weigh each raw material required for the rubber vulcanizing agent according to the proportion; put each raw material into an internal mixer, and mix for 10 minutes at a temperature of 80° C. and a rotational speed of 60 rpm to obtain a rubber compound.

[0033] Step 3. Put the rubber material obtained in step (2) into an extruder, control the given speed of the main engine to be 120r / min, and extrude a...

Embodiment 3

[0034] The preparation method of embodiment three, comprises the steps:

[0035] Step 1. Accurately weigh the raw materials required for the rubber carrier according to the weight ratio of EPDM rubber, binary ethylene propylene rubber and stearic acid of 8:5:1, first mix EPDM rubber, binary ethylene propylene rubber, Ethylene-propylene rubber is put into a banbury mixer for mixing, and then stearic acid is added for mixing. On the open mill, a sheet-shaped rubber carrier with a thickness of 10mm is made.

[0036] Step 2. Accurately weigh each raw material required for the rubber vulcanizing agent according to the proportion; put each raw material into an internal mixer, and mix for 2 minutes at a temperature of 80° C. and a rotational speed of 55 rpm to obtain a rubber compound.

[0037] Step 3. Put the rubber material obtained in step (2) into an extruder, control the given rotation speed of the main engine to be 115 r / min, and extrude at a temperature of 50° C. to obtain pre...

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Abstract

The invention relates to a pre-dispersed masterbatch formula containing tetrahydro-2(1H)-pyrimidinethione and a preparation method of the formula. The formula comprises the following components in parts by mass: 73-77 parts of tetrahydro-2(1H)-pyrimidinethione; 10-15 parts of a rubber carrier; 2-10 parts of an active agent component; 1-6 parts of hydrocarbon paraffin solid or fatty acid salt; and2-7 parts of paraffin oil. The preparation method comprises the following steps: firstly, preparing the rubber carrier; weighing the required raw materials; putting all the raw materials into an internal mixer to be internally mixed to obtain a rubber material; and finally, putting the rubber material into an extruder, and controlling the given rotating speed of a main machine to be 115-125r / min and the extrusion temperature to be 50-70 DEG C to prepare the pre-dispersed masterbatch containing the tetrahydro-2(1H)-pyrimidinethione. According to the invention, the dispersion problem of the tetrahydro-2(1H)-pyrimidinethione in rubber compound is improved, and the problem of dust pollution caused by direct use of the tetrahydro-2(1H)-pyrimidinethione is solved at the same time. Compared withrubber, especially chloroprene rubber, the pre-dispersed masterbatch has the characteristics of high vulcanization speed, high scorching safety, flat vulcanization, excellent thermal aging performance, no pollution, no coloring and no blooming, can replace ETU with reproductive toxicity and capable of generating carcinogenic substance nitrosamine in the vulcanization or use process, and has practical production value.

Description

technical field [0001] The invention relates to the technical field of rubber additives and their preparation, in particular to a predispersed masterbatch formulation containing tetrahydro-2(1H)-pyrimidinethione and a preparation method of the formulation. Background technique [0002] Tetrahydro-2(1H)-pyrimidinethione is a new type of high-efficiency green and environmentally friendly thiourea accelerator. For halogenated polymers, tetrahydro-2(1H)-pyrimidinethione can be used as a vulcanization aid in High-performance vulcanizates can be obtained in a short time with good scorch stability. Tetrahydro-2(1H)-pyrimidinethione is a white powder, although it can bring great benefits to rubber products, but in the process of rubber products, there are technical problems such as sticking rolls, flying dust, easy to agglomerate and difficult to disperse , At the same time endanger the health of employees and cause inaccurate measurement. In actual operation, methods such as prol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L91/06C08K5/36C08K5/09C08K5/405C08J3/22C08L11/00
CPCC08J3/226C08J2311/00C08J2423/16C08J2491/06C08K5/09C08K5/36C08K5/405
Inventor 连千荣
Owner NINGBO ACTMIX POLYMER
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