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Method for preparing chlorinated rubber by aqueous phase method

A chlorinated rubber and water-phase technology, applied in the field of preparing chlorinated rubber by water-phase method, can solve the problems of difficult water-phase suspension method, large salt residue, poor product performance, etc., and achieves low cost, good anti-corrosion performance, Good thermal stability

Pending Publication Date: 2021-10-22
上海宝钱新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing chlorinated rubber by the water phase method, which solves the problems of elimination of the existing solvent method, complex and difficult control of the water phase suspension method, poor product performance, high acid value, and residual salt after neutralization Large volume and other issues

Method used

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  • Method for preparing chlorinated rubber by aqueous phase method
  • Method for preparing chlorinated rubber by aqueous phase method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of rubber powder is:

[0028] First put the natural rubber into the internal mixer for masticating, and masticate at a temperature of 130-150°C for 8-13min. After cooling, put the masticated natural rubber into a liquid nitrogen crusher, slice and crush it at -120°C, and then add polyolefin wax micropowder anti-sticking agent with 5% natural rubber mass to the crushed material , and drop into the liquid nitrogen pulverizer together to obtain at least 60 orders of anti-caking rubber powder that can be used for chlorination.

[0029] Put 250 kg of rubber powder, 3500 kg of water, 2.8 kg of dilauroyl peroxide and benzoyl peroxide (granular) into the enamel reactor with a volume of 6300L, 7 kg of sodium polymethacrylate, alkylphenol 3 kg of polyoxyethylene ether, after the temperature reaches 40°C, keep the temperature and pass chlorine after the nitrogen has replaced the air, the initial pressure is 0.1Mpa, and the pressure is controlled at 0.3Mpa (...

Embodiment 2

[0031] First put 80 kg of masticated natural rubber into a 240 kg trichloroethane dissolving kettle, after heating and dissolving completely, add 15 kg of emulsifier while adding 300 kg of water under high-speed stirring to form a rubber emulsion.

[0032] Put 635 kg of rubber emulsion, 3000 kg of water, 1.2 kg of benzoyl peroxide (granular), 7 kg of sodium polymethacrylate, and 1.2 kg of alkylphenol polyoxyethylene ether into the enamel reactor with a volume of 6300L. After reaching 60°C, the chlorine flow is started, the initial pressure is 0.1Mpa, and the pressure is controlled at 0.35Mpa during the reaction process, and the chlorine flow is stopped when it reaches 110°C. The amount of chlorine flow is about 310 kg in theory. The finished product is finished after cooling down, washing with water, neutralization, pressure filtration and drying.

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Abstract

The invention provides a method for preparing chlorinated rubber by an aqueous phase method, which comprises the following steps: firstly, plastifying and degrading natural rubber, and then crushing the natural rubber through low-temperature liquid nitrogen to prevent sticking to obtain rubber powder; and adding the rubber powder into a reaction container, adding an initiator, an anti-binding agent and an emulsifier, introducing chlorine by adopting a low-temperature and high-temperature sectional chlorination process, and finally obtaining the chlorinated rubber. The chlorine content of the chlorinated rubber reaches 63% or above, and the chlorinated rubber is excellent in performance and has good market application prospects.

Description

technical field [0001] The invention relates to the field of chlorinated rubber, in particular to a method for preparing chlorinated rubber by an aqueous phase method. Background technique [0002] Chlorinated rubber is obtained from rubber powder degraded by natural rubber through mastication and modified by chlorination. It has excellent corrosion resistance, film-forming tightness, salt spray resistance, adhesion, fast drying speed, and high hardness. , flame retardancy, insulation and other characteristics. The product is white or yellowish powdery solid, soluble in esters, chlorinated hydrocarbons, benzene and other solvents at room temperature, widely used in ocean ships, inland river ships, offshore oil production platforms, bridges, docks, iron towers, containers, Anti-corrosion paints for high-demand facilities such as automobile chassis, road signs, and chemical plant equipment can also be used to manufacture high-strength adhesives, printing inks for polar materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/14C08C19/08
CPCC08C19/14C08C19/08
Inventor 杨太山
Owner 上海宝钱新材料技术有限公司