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Chlorinated polystyrene and a preparing method thereof

A technology of chlorinated polystyrene and polystyrene, which is applied in the chemical industry, can solve the problems of threats to life and property safety, improvement of flame retardant performance and decline of mechanical properties, and achieve good stability, good processing performance and easy plasticization Effect

Inactive Publication Date: 2017-04-19
山东龙阳化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polystyrene is extremely flammable, and produces a large amount of molten dripping when burning, accompanied by a large amount of black smoke, which poses a huge potential threat to people's lives and property safety. Therefore, the flame retardant research of polystyrene has become an important research topic.
[0003] The traditional practice of polystyrene flame retardant is to add various flame retardants through physical blending, but the flame retardant performance often increases after the addition of flame retardants to the system, and the mechanical properties decrease.

Method used

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  • Chlorinated polystyrene and a preparing method thereof
  • Chlorinated polystyrene and a preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Take 1.5kg of polystyrene powder (weight-average molecular weight of 100,000, Mw / Mn of 2.5) and 10kg of water into the reaction kettle, add 50g of sodium lauryl sulfate, 40g of polyvinyl alcohol, and 75g of BPO, seal, stir and heat up To 70°C, feed chlorine gas from the bottom of the reactor and control the temperature to increase gradually, the temperature rise rate is 12°C / hour, the rate of chlorine flow is 200g / hour, the final reaction temperature is 105°C, the total amount of chlorine flow is 600g, and the total reaction time is 3 hours. After 3 times of alkali washing and 3 times of water washing, water-solid separation is carried out, and the solid product is dried at 50°C to obtain a finished product. The measured chlorine content is 16%, and the heating loss is 0.7%.

Embodiment 2

[0026] Take 1.5kg of polystyrene powder and 10kg of water into the reactor, add 50g of sodium chloride alkylsulfate, 40g of sodium polymethacrylate, and 75g of BPO respectively, seal it up, stir and heat up to 70°C, and feed it from the bottom of the reactor Chlorine and control the temperature to gradually increase, the heating rate is 12°C / hour, the rate of chlorine flow is 200g / hour, the final reaction temperature is 105°C, the total amount of chlorine flow is 600g, and the total reaction time is 3 hours. After 3 times of alkali washing and 3 times of water washing, water-solid separation is carried out, and the solid product is dried at 50°C to obtain a finished product. The measured chlorine content is 15.8%, and the heating loss is 0.6%.

Embodiment 3

[0028] Take 1.5kg of polystyrene powder (weight-average molecular weight of 100,000, Mw / Mn of 2.5) and 10kg of water into the reaction kettle, add 50g of sodium lauryl sulfate, 40g of polyvinyl alcohol, and 75g of BPO, seal, stir and heat up To 70°C, feed chlorine gas from the bottom of the reactor and control the temperature to increase gradually, the temperature rise rate is 12°C / hour, the rate of chlorine flow is 300g / hour, the final reaction temperature is 105°C, the total amount of chlorine flow is 900g, and the total reaction time is 3 hours. After 3 times of alkali washing and 3 times of water washing, water-solid separation is carried out, and the solid product is dried at 50°C to obtain a finished product. The measured chlorine content is 23%, and the heating loss is 0.7%.

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Abstract

Chlorinated polystyrene and a preparing method thereof are provided. The chlorinated polystyrene and the method are characterized in that the method includes steps of (1) suspending and dispersing polystyrene powder into a water medium under stirring, and adding an emulsifier, a dispersant and an initiator, and (2) raising the temperature to 60-80 DEG C, feeding chlorine, reacting the materials, gradually controlling and raising the temperature to be 100-110 DEG C and reacting continuously, with the reaction time being 1-4 h; the temperature rising rate in the step (2) is 15-20 DEG C / h; a water-phase suspension process is adopted to perform chlorination on the polystyrene so that flame retardance and heat resistance can be improved; and addition of a flame retardant reducing mechanical properties of the polystyrene is avoided.

Description

technical field [0001] The invention belongs to the field of chemical engineering, and in particular relates to a chlorinated polystyrene and a preparation method thereof. Background technique [0002] Polystyrene has excellent mechanical properties, heat insulation properties, electrical insulation, dimensional stability, processing fluidity, and chemical corrosion resistance. It is widely used in various fields such as construction, instrumentation, home appliances, daily necessities, and packaging. However, polystyrene is extremely flammable, and it produces a large amount of molten dripping, accompanied by a large amount of black smoke, which poses a huge potential threat to people's lives and property safety. Therefore, the flame retardant research of polystyrene has become an important research topic. [0003] The traditional practice of polystyrene flame retardant is to add various flame retardants through physical blending, but after adding flame retardants to the sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/22C08F112/08C08L25/06
CPCC08F8/22C08L25/06C08L2205/025C08F112/08
Inventor 展宏王勋林李乐绪
Owner 山东龙阳化工有限公司
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