Method for preparing polychloroethylene with high polymerization degree

A technology of polyvinyl chloride and high degree of polymerization, applied in the field of preparation of polyvinyl chloride resin, can solve the problems of shortening the reaction time, removing heat from the polymerization kettle, etc., so as to solve the problem of difficult temperature control, shorten the reaction time, and improve the mechanical properties. Effect

Inactive Publication Date: 2009-03-18
ELECTROCHEM PLANT OF ZHEJIANG JUHUA +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot solve the problem of shortening the reaction time, removing heat from the polymerization tank, and improving the processing performance of the resin at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Components:

[0028] Mixed monomer: vinyl chloride (VCM) 850kg

[0029] Soft water 1800kg

[0030] Dispersant: HPMC / SH50 / KH20 0.94kg

[0031] Initiator: Tx99 (2-cumyl peroxyneodecanoate (40% aqueous emulsion))

[0032] 0.7kg

[0033] pH adjuster: sodium bicarbonate 0.45kg

[0034] Compound chain extender: diallyl isophthalate / mercaptoethanol, the ratio is 3:1

[0035] 0.85kg

[0036] Terminator: acetone thiosemicarbazide 0.08kg

[0037] Operation method: at 3m 3 In the polymerization kettle, add soft water, dispersant, and other additives for polymerization in order from the manhole. 2 Test the pressure to 0.4MPa and keep it for 10 minutes. After checking that there is no leakage, pump the vacuum to 0.085MPa and keep it for 5 minutes. After checking that there is no leakage, add the mixed monomer. The stirring speed was 150 rpm, and the temperature was raised to 45 ° C under cold stir...

Embodiment 2

[0039] Repeat Example 1, with the difference that the components of the mixed monomers are:

[0040] (1) Vinyl chloride (VCM) 800kg

[0041] (2) Butyl acrylate (BA) 50kg

[0042] The polymerization time was 11.3h, and the results are shown in Table 1.

Embodiment 3

[0044] Example 1 was repeated, except that the compound chain extender: diallyl isophthalate / mercaptoethanol was added in a ratio of 2.8:1, and the polymerization time was 12.2 h. The results are shown in Table 1.

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Abstract

The invention provides a method for preparing polyvinyl chloride with high polymerization degree. A mixed monomer, a dispersing agent, an initiator, soft water, a pH regulator and a composite chain extender are added into a polymerization kettle for suspension copolymerization reaction. The method is characterized in that the composite chain extender is a complex system formed by a chain extender and a chain transfer agent, wherein the chain extender can be one or more than one of diallyl fumarate, diallyl isophthalate and diallyl maleate, and the chain transfer agent can be one or more than one of lauryl mercaptan, mercaptoethanol, carbon terabromide, trichlorethylene, and thioglycollic acid alpha-ethyl hexaester; and the weight ratio of the chain extender to the chain transfer agent is between 2.8 to 1 and 3.2 to 1, and the total addition amount is between 0.08 and 0.15 percent. The complex system of the chain extender and the chain transfer agent can shorten the reaction time, solve the problem of the hardly-controllable polymerization temperature, improve the workability of products, and increase the mechanical property of the products.

Description

technical field [0001] The invention relates to a preparation method of polyvinyl chloride resin, in particular to a method for producing high degree of polymerization polyvinyl chloride resin by using a compound chain extender. Background technique [0002] Polyvinyl chloride (PVC for short) products are widely used in industry, construction, agriculture and other fields. However, due to its structure, PVC has the defect of poor thermal stability. It begins to decompose at 100 ° C and releases hydrogen chloride. When the temperature exceeds 150 ° C, the decomposition is more rapid, and ultraviolet light, mechanical force, oxygen, active metal ions, etc. will accelerate decompose, resulting in reduced performance. The Tg of PVC is about 87°C, and the melting temperature is about 210°C. Processing and molding are generally required to be carried out in a molten state. Polyvinyl chloride is decomposed by heat, which causes processing difficulties; at the same time, due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/06C08F222/26C08F218/16C08F222/28C08F2/38C08F2/18
Inventor 韩金铭陈繁荣舒文晓苏兰辉吴宇鹏
Owner ELECTROCHEM PLANT OF ZHEJIANG JUHUA
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