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A kind of preparation method of chlorinated polyethylene

A technology for chlorinated polyethylene and polyethylene, applied in the field of preparation of chlorinated polyethylene, can solve the problems of low chlorine utilization rate, large amount of dilute hydrochloric acid, and high treatment cost, and achieves less waste water discharge, less investment in equipment, and high production efficiency. low cost effect

Active Publication Date: 2011-11-30
杭州新元化工技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a process for the problems of large amount of dilute hydrochloric acid by-product in the production of existing chlorinated polyethylene (abbreviated as CPE), high treatment cost, low chlorine utilization rate and negative impact on the environment. Reasonable, the reaction medium can be reused, and the by-product gaseous HCl is an easy-to-use method for important chemical raw materials. The chlorine utilization rate of this method can reach more than 98%, and there is no acid wastewater discharge, which is suitable for large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of preparation method of chlorinated polyethylene, its step is as follows:

[0031] (1) Put 20Kg of powdered high-density polyethylene (molecular weight about 140,000) with an average particle size of 125μm, MI (5Kg, 190°C) 0.48g / 10min, and melting point of 136°C into 170Kg of 21% hydrochloric acid, 60g of poly Sodium methacrylate, 4g benzoyl peroxide and 10g polyether PF-10 in a 200L glass-lined reactor, start stirring to disperse the materials evenly. The glass-lined reactor is connected in series with a falling-film graphite cooler and a gas-liquid separator.

[0032] (2) Introduce steam to the jacket of the glass-lined reactor to raise the temperature of the material to 75°C, and then introduce chlorine gas to react. Control the flow rate of chlorine gas between 100 and 135g / min. When the reaction temperature reaches 125°C and the kettle pressure is 0.5Mpa , Open the connecting valve between the glass-lined reactor and the falling film graphite cooler, adju...

Embodiment 2

[0038]A kind of preparation method of chlorinated polyethylene, its step is as follows:

[0039] (1) Put 20Kg of powdered high-density polyethylene (molecular weight about 110000) with an average particle size of 150μm, MI (5Kg, 190°C) 1.9g / 10min, and melting point of 132°C into 170Kg of 21% HCl aqueous solution (mentioned above Example 1, obtained in step (4), 30g of sodium polymethacrylate, 4g of benzoyl peroxide and 10g of polyether PF-10 in a 200L glass-lined reactor, started stirring to disperse the materials evenly. The glass-lined reactor is connected in series with a falling-film graphite cooler and a gas-liquid separator.

[0040] (2) Same as step (2) in Example 1.

[0041] (3) Same as step (3) in Example 1.

[0042] (4) Same as step (4) in Example 1.

[0043] Analysis results of the CPE product prepared in this example: chlorine content 35.2%; Mooney viscosity (ML1+4, 121°C) 45; Shore hardness (A) 45; tensile strength 8.6Mpa; elongation at break 1020% ; Meet ...

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Abstract

The invention relates to the field of chlorinated polyethylene preparation, in particular relates to a preparation method of chlorinated polyethylene based on hydrochloric acid suspension chlorination. The method comprises the following steps: adding polyethylene used as a raw material in a chlorination reactor containing 18-25% hydrochloric acid, a surfactant, an initiator and a dispersing agent, and heating to above 70 DEG C under the condition of stirring; introducing chlorine gas at a certain temperature and pressure, and opening a connection valve of the reaction kettle and a graphite cooler when the temperature in a kettle reaches 120 DEG C and the pressure in the kettle exceeds 0.4MPa so that steam enters the cooler to be condensed into liquid; respectively separating gaseous hydrogen chloride and liquid hydrochloric acid by a gas-liquid separator and discharging gaseous hydrogen chloride and liquid hydrochloric acid respectively; after introduction of chlorine is finished, closing the connection valve of the reaction kettle and the graphite cooler; introducing cooling water into the clamp sleeve of the reactor so that the temperature of the material is reduced to less than80 DEG C; and washing solid material obtained by solid-liquid separation with water, and drying so as to prepare chlorinated polyethylene. Chlorinated polyethylene prepared by the method can be used as an impact resisting modifier of plastic and a special synthesis rubber.

Description

technical field [0001] The invention relates to the field of preparation of chlorinated polyethylene (CPE), in particular to a preparation method of chlorinated polyethylene based on hydrochloric acid suspension chlorination. Background technique [0002] Chlorinated polyethylene is an elastomer obtained by substitution reaction between polyethylene and chlorine. It has excellent weather resistance, aging resistance, oil resistance, chemical resistance and flame retardancy. It is mainly used as an impact modifier for synthetic resins. agent and special synthetic rubber. [0003] The main production method of chlorinated polyethylene is to suspend polyethylene in water, add chlorine and react under certain conditions. Since the hydrogen chloride produced during the reaction is soluble in water, about 5% dilute hydrochloric acid is formed after the reaction. Therefore, the effective utilization rate of chlorine is less than 50%. [0004] Every ton of chlorinated polyethylen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F8/22
Inventor 白杰
Owner 杭州新元化工技术开发有限公司
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