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Preparation method of powdery chloroprene rubber with good fluidity and high cohesiveness

A chloroprene rubber and chloroprene latex technology, applied in the direction of adhesive type, adhesive, graft polymer adhesive, etc., to achieve the effect of good fluidity, better performance and good bond strength

Active Publication Date: 2013-07-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is only powdered common neoprene produced by mechanical pulverization on the market.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 100 parts of water and 100 parts of chloroprene latex with a solid content of 35% in a 10L polymerization kettle, sequentially add 10 parts of isoprene, 12 parts of chitosan, and 0.5 part of sulfur. After replacing with nitrogen, stir and heat. When the temperature of the polymerization tank reached 25°C, 0.5 parts of initiator potassium persulfate and 3 parts of activator rosin soap were added to carry out graft polymerization reaction at 40°C. When the conversion rate of the system is 70%, add 5 parts of terminator dibutyl phthalate. Take 100 parts of grafted latex and add it to the coagulation kettle, add 10 parts of flocculant sodium silicate and 10 parts of coagulant calcium chloride at the coagulation temperature of 25°C, stir and mix well; raise the temperature to 60°C, mature for 6 hours, separate, Dehydration and drying are used to obtain powdered neoprene rubber products. The structure and properties of the sample were tested by classical methods, the res...

Embodiment 2

[0034] Add 80 parts of water, 100 parts of chloroprene latex with a solid content of 33% in a 10L polymerization kettle, add 15 parts of isoprene, 12 parts of chitosan, and 0.6 part of sulfur successively, replace with nitrogen, stir and heat, When the temperature of the polymerization tank reached 30°C, 0.6 parts of initiator potassium persulfate and 5 parts of activator rosin soap were added to carry out graft polymerization reaction at 30°C. When the conversion rate of the system is 65%, add 3 parts of terminator dibutyl phthalate. Take 100 parts of grafted latex and add it to the coagulation kettle, add 8 parts of flocculant sodium silicate and 8 parts of coagulant calcium chloride at the coagulation temperature of 30°C, stir and mix well; heat up to 50°C, mature for 7 hours, separate, Dehydration and drying are used to obtain powdered neoprene rubber products. The structure and properties of the sample were tested by classical methods, the results are as follows: powder ...

Embodiment 3

[0038] Add 90 parts of water in a 10L polymerization kettle, 100 parts of chloroprene latex with a solid content of 30%, successively add 18 parts of isoprene, 18 parts of chitosan, and 1.0 part of regulator D, after replacing with nitrogen, stir, Heating, when the temperature of the polymerization tank reaches 40°C, add 1.0 parts of initiator potassium persulfate and 8 parts of activator rosin soap to carry out graft polymerization reaction at 20°C. When the conversion rate of the system was 75%, 6 parts of terminator dibutyl phthalate were added. Take 100 parts of grafted latex and add it to the coagulation kettle, add 15 parts of flocculant sodium silicate and 15 parts of coagulant calcium chloride at the coagulation temperature of 15°C, stir and mix well; raise the temperature to 40°C, mature for 5 hours, separate, Dehydration and drying are used to obtain powdered neoprene rubber products. The structure and properties of the sample were tested by classical methods, the res...

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PUM

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Abstract

The invention relates to a preparation method of powdery chloroprene rubber with good fluidity and high cohesiveness. The preparation method comprises the following steps: 1, successively adding water, neoprene latex, isoprene, chitosan, and a molecular weight conditioning agent to a polymerization kettle, heating with stirring, adding an initiator and an activator when the temperature of the polymerization kettle reaches 20-30DEG C, carrying out a graft polymerization reaction at 20-50DEG C, and adding a terminator when the system conversion rate is 60-75% to prepare grafted neoprene latex; and 2, adding a flocculant and a coagulant to the grafted neoprene latex, heating to 20-80DEG C, curing for 3-8h, separating, dehydrating, and drying to prepare the powdery chloroprene rubber. The particle size of the powdery chloroprene rubber is 0.40-0.80mm, the powdered ratio of the powdery chloroprene rubber is equal to or greater than 99.2%, the ash content of the powdery chloroprene rubber is equal to or less than 0.09%, the volatile matter content of the powdery chloroprene rubber is equal to or less than 0.20%, the trans-polyisoprene content in the powdery chloroprene rubber is 15-35%,the swelling time of the powdery chloroprene rubber is 2-20s, the dissolving time of the powdery chloroprene rubber is 1-4h, and the peeling strength of the powdery chloroprene rubber is equal to or greater than 85N / cm.

Description

technical field [0001] The invention belongs to the preparation of powdered neoprene rubber, relates to the field of adhesives, in particular to a class of easy-flowing, high-adhesion powdered neoprene rubber and a preparation method thereof. Background technique [0002] Chloroprene rubber is an elastomer obtained by emulsion polymerization of 2-chloro-1,3-butadiene as a monomer, and it is also one of the commonly used rubber varieties. As an important variety of CR, bonded neoprene is an important raw material in the adhesive industry. Due to its excellent performance, its application fields range from construction, building materials, mining materials, safety capsules for automobiles to civilian products, etc., and the scope of application is still expanding. [0003] The neoprene rubber supplied in the market is mainly sheet rubber. When using powdered neoprene rubber instead of traditional sheet rubber to produce vulcanized rubber products, it can save energy and time,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L51/04C08L5/08C08F279/02C08C1/14C09J151/04
Inventor 梁滔魏绪玲龚光碧曹凤霞郑聚成艾纯金赵志超徐典宏丛日新邵卫
Owner PETROCHINA CO LTD