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Preparation method of halogenated polymer

A technology of halogenated polymers and mixtures, which is applied in the field of polymer materials and can solve problems such as increased scrap rate, pollution, and drop-off

Active Publication Date: 2020-04-17
NOVASHIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009]The above-mentioned precipitates are wrapped in the precipitated polymer solids in the degassing unit, for example, calcium sulfate will appear in the form of white particles in the finished polymer containing halogens, causing pollute
In addition, the above-mentioned precipitation (such as calcium sulfate) will scale on the processing equipment, which will reduce the heat transfer efficiency of the equipment, and the scale will fall off irregularly and enter the finished product, affecting the halogen-containing polymer products. quality, increasing the scrap rate

Method used

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  • Preparation method of halogenated polymer

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[0033] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0034] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0036] Such as figure 1 As shown in the process flow chart, bromine is contacted with the polymer solution to be halogenated for bromination reaction to obtain a reaction solution containing brominated polymer, and the polymer solution after bromination reaction is first added with aqueous sodium hydroxide solution 1 for neutralization reaction Hydrobromic acid is a by-product in the liquid; the neutralized reaction liquid, nitrogen-containing substances or their aqueous solution 2, additives 3, such as calcium stearate, antioxidants, etc. are contacted, and nitrogen-containing substances react with unreacted bromine ; The brominated polymer reaction liquid is contacted with hot water and steam in the coagulation kettle, the solvent is volatilized by heating, the solvent is recovered, the polymer particles are precipitated, and water-soluble substances such as salts in the polymer reaction liquid are dissolved into the water phase; the precipitated The polymer particles and th...

Embodiment 2

[0039] Cut the butyl rubber into about 10mm pieces, add n-hexane to dissolve it into 15% butyl rubber n-hexane solution; heat the butyl rubber solution to 45°C, add liquid bromine according to 5.23wt% of the solid butyl rubber, and stir After reacting for about 10 minutes, a bromination reaction solution was obtained. React 17060kg / hr bromination reaction solution at 45°C with 700kg / hr of 5% sodium hydroxide aqueous solution in a neutralization tank, neutralize brominated butyl rubber reaction solution, 75kg / hr of 8% Hydrazine hydrate, 85300kg / hr of 95°C circulating hot water, 500kg / hr of 0.5MPa steam, 384kg / hr of calcium stearate solution (solid content 10%), 51.2kg / hr of 10% antioxidant After contact with the agent 1010, it enters into the coagulation kettle, stirs vigorously, and the hexane is volatilized by heating and comes out from the top of the coagulation kettle, and the solvent is removed for recovery. The precipitated bromobutyl rubber particles are suspended in th...

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Abstract

The invention provides a preparation method of a halogenated polymer. The method comprises the following steps: making a halogenating agent contact a to-be-halogenated polymer solution, carrying out ahalogenation reaction, neutralizing the hydrogen halide generated by the halogenation reaction with an alkali, and making the mixed system contact a nitrogen-containing substance to remove the incompletely-reacted halogenating agent. By adopting the preparation method disclosed by the invention, the unreacted halogenating agent in the reaction process can be efficiently removed, and the unreactedhalogenating agent is prevented from being removed by adopting a sulfur-containing reducing agent, so that adverse effects of sulfate radicals on the processing process and the product quality in thesubsequent processing process of the polymer are avoided.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a halogenated polymer. Background technique [0002] Halogenated polymers are a large class of widely used chemical products, such as halogenated butyl rubber, which is the product of the reaction of butyl rubber and halogens such as chlorine and liquid bromine. Halogenated butyl rubber not only inherits the airtightness of butyl rubber The advantages of high stability, at the same time, the vulcanization speed is greatly improved, and the compatibility with other polymers is also greatly increased. [0003] Calcium stearate is a metal soap surfactant. Because the preparation method is simple and cheap, and it is non-toxic, environmentally friendly, and weakly alkaline, it is widely used in food, medicine, cosmetics, plastics and rubber industries, mainly as lubricants, emulsifiers, stabilizers, mold release Agents, accelerators, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/22C08F210/12C08L23/28C08K5/134C08K5/098
CPCC08F8/22C08K5/1345C08K5/098C08F210/12C08L23/283
Inventor 汪帆杨建春朱荣欣
Owner NOVASHIN CO LTD