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Prepn. process of powdered neoprene and granulated neoprene

A technology of neoprene and neoprene latex, which is applied in the field of powder neoprene and granular neoprene preparation, can solve the problems of easy falling off of inorganic particles, unfavorable long-term storage, complicated equipment, etc., and achieve excellent physical and mechanical properties, Good coating effect and good fluidity

Inactive Publication Date: 2005-05-25
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first two methods have complex equipment and high energy consumption
The coacervation coating method has relatively simple equipment and low energy consumption. The coating agents used mainly include: inorganic substances (such as: water glass, white carbon black and CaCO 3 , talcum powder, etc.), starch xanthate, polymer resin, etc.; among them, the inorganic material isolation method is adopted, and the amount of inorganic material is relatively large. It is easy to fall off during the process, causing adhesion between rubber particles and flying dust of inorganic particles, which is not conducive to long-term storage. This method is not suitable for occasions with strict requirements on the ash content in rubber; and starch xanthate is used as The powder or granule rubber prepared by the coating agent is prone to mildew, yellowing and aging during storage, which seriously affects the quality of powder and granule rubber products; the powder or granule rubber prepared by using polymer resin as the coating agent is suitable for the preparation of filling type However, due to the introduction of polymer resin into the rubber matrix, this part of polymer resin exists in the rubber compound in the form of resin filler after rubber mixing and vulcanization, which affects to a certain extent Therefore, this method is not suitable for the preparation of powdered neoprene rubber and granular neoprene rubber of pure rubber, especially in the occasions where there are strict requirements on the rubber content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method steps of this powder chloroprene rubber and particle chloroprene rubber are as follows:

[0034] Step 1: Prepare materials

[0035] Get 120 kilograms of unbroken chain chloroprene latex that solid content is 33.4%, all the other ingredients are shown in Table 1.

[0036] Step 2: Chain breakage of latex

[0037] Add 120 kg of unbroken chain chloroprene latex with a solid content of 33.4% to a 150-liter mixing tank equipped with an agitator, heat it in a water bath to 30±2°C, and keep it constant; adjust the stirring speed to 150rpm, and add and measure under stirring 5% sodium hydroxide solution, adjust the pH value of latex to 11.4 ± 0.1, add the mixed solution of measured TETD and benzene, keep the chain scission time determined by Table 1.

[0038] Step 3: Heat Treatment of Latex

[0039] Heat the chain-broken chloroprene latex to 80°C with a jacket, add metered sodium stearate and anti-aging agent 264 mixed hot water solution under stirring,...

Embodiment 2

[0045] The preparation method steps of this powder chloroprene rubber and particle chloroprene rubber are as follows:

[0046] Step 1: Prepare materials

[0047] Getting 114.5 kilograms of solid content is 35% unbroken chain chloroprene latex, and all the other ingredients are shown in Table 1.

[0048] Step 2: Chain breakage of latex

[0049] Add 114.5 kg of unbroken chain chloroprene latex with a solid content of 35% to a 150-liter mixing tank equipped with a stirrer, heat it in a water bath to 30±2°C, and keep it constant; adjust the stirring speed to 120rpm, and add and measure under stirring 5% sodium hydroxide solution, adjust the pH value of the latex to 11.6 ± 0.1, add the mixed solution of measured TETD and benzene, and keep the chain scission time determined in Table 1.

[0050] Step 3: Heat Treatment of Latex

[0051] Heat the chain-broken chloroprene latex to 75°C with a jacket, add metered sodium stearate and anti-aging agent 264 mixed hot water solution under ...

Embodiment 3

[0057] The preparation method steps of this powder chloroprene rubber and particle chloroprene rubber are as follows:

[0058] Step 1: Prepare materials

[0059] Get 120 kilograms of unbroken chain chloroprene latex that solid content is 33.4%, all the other ingredients are shown in Table 1.

[0060] Step 2: Chain breakage of latex

[0061] Add 120 kg of unbroken chain neoprene latex with a solid content of 33.4% in a 150-liter mixing tank equipped with an agitator, heat it in a water bath to 30 ± 2°C, and keep it constant; adjust the stirring speed to 200rpm, and in the stirring state, Add metered 5% sodium hydroxide solution to adjust the pH of the latex to 11.8±0.1, add metered mixed solution of TETD and benzene, and keep the chain scission time determined in Table 1.

[0062] Step 3: Heat Treatment of Latex

[0063] Heat the chain-broken chloroprene latex to 90°C with a jacket, add a measured amount of mixed hot water solution of sodium stearate and antioxidant 264 unde...

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Abstract

The invention provides a method for preparing powdered neoprene rubber and granular neoprene rubber. Add an emulsifier aqueous solution of a monovalent metal salt into neoprene latex, and process steps such as heat treatment, coagulation and hardening to prepare powdered neoprene rubber and granular neoprene rubber. Neoprene particles, after filtration, washing, dehydration and drying, you can get the former with a particle size distribution of less than 1.0mm and the latter with a particle size distribution of 1.0-5.0mm, stable storage and good fluidity. . The coating on the surface of the powdered neoprene rubber and granular neoprene particles prepared by the method is a coating release agent generated during the preparation process, and the coating effect is good. The preparation process of the present invention is stable, reliable and convenient. The prepared powder neoprene rubber and granule neoprene rubber do not stick together, are easy to dehydrate and dry, and the production equipment is simple; by adjusting the coagulation conditions, a variety of different particle size distributions can be prepared. Powder neoprene and granular neoprene required by national standards.

Description

technical field [0001] The invention relates to the field of rubber production and processing, in particular to a preparation method of powder neoprene rubber and granular neoprene rubber. Background technique [0002] Powdered rubber (Powdered Rubber) generally refers to rubber particles with a particle size of less than 1.0 mm and good fluidity, while granular rubber (Granular Rubber) generally refers to rubber particles with a particle size between 1.0 and 10.0 mm and good fluidity. At present, the production of block neoprene rubber with neoprene latex generally adopts freeze coagulation technology. After freeze coagulation and dehydration, the latex is strip-shaped and dried on a metal belt at high temperature. The product is easy to bond with the metal belt and produces black scorched particles, thereby Affect the appearance and quality of the product; compared with the bulk neoprene, the powder neoprene and granular neoprene have finer partic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B1/14C08J3/12C08L11/00
Inventor 王炼石张安强周奕雨党呈裕
Owner SOUTH CHINA UNIV OF TECH