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Vinyl chloride polymerization reaction termination method

A technology of vinyl chloride polymerization and vinyl chloride monomer, which is applied in the field of vinyl chloride polymerization reaction termination, can solve the problems such as narrowing of use range, poor thermal stability improvement effect, inability to quickly terminate the thermal stability of vinyl chloride resin, etc. Termination effect, effect of improving thermal stability

Active Publication Date: 2017-12-15
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among these chemical substances, bisphenol A and acetone thiosemicarbazone are less effective in improving the thermal stability of vinyl chloride polymers, and are non-environmentally friendly substances, and the scope of use is decreasing day by day
[0004] Chinese patents CN1250583C and CN 1219801C proposed to use 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyl oxygen, N-tert-butyl-1-diethylphosphoryl-2,2-di Methyl propyl nitroxide and diethylhydroxylamine are used as terminators. Although the polymerization termination effect is obvious, the improvement of the thermal stability of vinyl chloride resin is very limited.
[0007] In summary, in the existing vinyl chloride polymerization process, there are some deficiencies in the terminator (including its composition) technology used, which cannot take into account the effects of rapid termination and obvious improvement of the thermal stability of vinyl chloride resin

Method used

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  • Vinyl chloride polymerization reaction termination method
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Examples

Experimental program
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Effect test

Embodiment 1

[0036] Add 2.4kg desalted water, 8.0g concentration of 5.0% polyvinyl alcohol 424H aqueous solution (KURARAY company product), 10.0g concentration of 3.0% hydroxypropyl methylcellulose in the 5L stainless steel pressure reactor equipped with two-layer double-leaf flat paddle Element E50 solution (Dow chemical products), 0.267g content 75% tert-butyl peroxyneodecanoate (TBPND, Akzo Nobel Tianjin company production) and 0.533g content 75% pivalate pivalate (TAPP, Akzo Nobel produced by Tianjin Company). Evacuate the pressure inside the kettle to below -0.090MPa, add 1.0kg of vinyl chloride monomer, start stirring, control the speed at 480rpm, stir and mix at room temperature for 10 minutes, then raise the temperature of the kettle to 62.2°C, and react after the temperature is stable Start timing, and add 22.0 g of 1% NG aqueous solution of formula quantity to kettle by plunger metering pump with 0.2 g / min flow rate. When the pressure drop in the kettle reached 0.10MPa, add 10.0...

Embodiment 2

[0042] The polymerization operation method is the same as that of Example 1, except that 50.0 g of 1.0% DEHA aqueous solution and 2.0 g of DLTP emulsion with an effective content of 20% are used to terminate the polymerization. The results are shown in Table 1.

Embodiment 3

[0044] The polymerization operation method is the same as in Example 1, except that 10.0 g of 1.0% DEHA aqueous solution and 1.0 g of 20% effective content of distearyl thiodipropionate (DSTP) emulsion are used to terminate the polymerization.

[0045] In this example, the preparation method of the DSTP emulsion is the same as that of the DLTP in Example 1, except that it needs to be heated up to 75°C, and then cooled to below 50°C. The results are shown in Table 1.

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Abstract

The invention relates to a vinyl chloride polymerization reaction termination method and belongs to the technical field of vinyl chloride polymerization. The method comprises (1) initiating polymerization of a vinyl chloride monomer in the presence of an initiator and (2) when the vinyl chloride monomer conversion rate reaches 60-90% (polymer mass relative to that of the added monomer), adding a composition of a terminator alkyl-substituted hydroxylamine and a thioester antioxidant into the polymerization system. The vinyl chloride polymerization reaction termination method fast terminates a vinyl chloride polymerization reaction and remarkably improves the thermal stability of the polyvinyl chloride resin.

Description

technical field [0001] The invention relates to a method for terminating a vinyl chloride polymerization reaction, which belongs to the technical field of vinyl chloride polymerization. Background technique [0002] Vinyl chloride and its copolymers have been widely used in the manufacture of daily necessities and industrial products. The processed resin products basically maintain many excellent properties of vinyl chloride resin, such as flame retardant, wear resistance, chemical corrosion resistance, low price, and easy processing. molding etc. After years of development, vinyl chloride polymerization technology mainly adopts suspension polymerization, emulsion polymerization and bulk polymerization for different purposes. In the operation of suspension polymerization and emulsion polymerization, due to the influence of vinyl chloride polymerization kinetics, when the conversion rate reaches a certain value, the thermal stability of the polymer will deteriorate, so it is...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F2/42
CPCC08F2/42C08F114/06
Inventor 张磊梁斌李留忠李静王晶车万里张桦
Owner CHINA PETROLEUM & CHEM CORP
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