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Vinyl chloride monomer polymerization reaction system reaction termination method

A vinyl chloride monomer and polymerization reaction technology, which is applied in the field of reaction termination of vinyl chloride monomer polymerization reaction system, can solve the problems of insignificant improvement of thermal stability of resin, low efficiency of polymerization termination, and limited improvement of thermal stability performance, etc., to achieve Excellent thermal stability effect, rapid polymerization termination effect, scientific and reasonable termination method

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These terminators have certain disadvantages in the use of vinyl chloride polymerization termination: either the termination efficiency is satisfactory but the thermal stability of the resin is not significantly improved, or the volatility is strong, resulting in a large loss when heated, or the water solubility is poor, and it is difficult to prepare a dispersion solution. Difficult to use, or inefficient at terminating polymerization, or somewhat toxic
Although this method provides a higher polymerization termination effect, the improvement of thermal stability performance is still limited

Method used

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  • Vinyl chloride monomer polymerization reaction system reaction termination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The polymerization reaction was carried out in a stainless steel reactor with a volume of 5 L equipped with two-layer flat paddles.

[0041] The polymerization formula is as follows:

[0042] raw material name

Dosage / kg

VCM

1.45

DW

2.10

PVA(I)

0.0002

E50

0.00028

PVA(II)

0.00046

TAPP

0.0006

TBPND

0.0003

NG

0.00018

NaOH

0.000065

DEHA

0.0002

OE-Sn

0.00725(500ppm)

[0043] Note:

[0044] VCM: vinyl chloride monomer.

[0045] DW: desalinated water.

[0046] PVA (I): polyvinyl alcohol, alcoholysis degree 80% (mole fraction), viscosity 48mPa.s (measured at 20°C, 4% concentration).

[0047] PVA(II): polyvinyl alcohol, alcoholysis degree 45% (mole fraction), viscosity 90mPa.s (measured at 25°C, 35% concentration).

[0048] E50: hydroxypropyl methylcellulose, with a methoxy substitution degree of 25%, a hydroxyprop...

Embodiment 2

[0059] Adopt the polymerization reactor identical with embodiment 1, used formula is as follows:

[0060] raw material name

Dosage / kg

VCM

1.53

DW

1.82

PVA(I)

0.00061

E50

0.00106

PVA(II)

0.00019

ACPND

0.00026

EHP

0.00078

NaOH

0.000048

DEHA

0.00011

OE-Sn

0.00382(250ppm)

[0061] Note:

[0062] VCM: vinyl chloride monomer.

[0063] DW: desalinated water.

[0064] PVA (I): polyvinyl alcohol, alcoholysis degree 80% (mole fraction), viscosity 48mPa.s (measured at 20°C, 4% concentration).

[0065] PVA(II): polyvinyl alcohol, alcoholysis degree 45% (mole fraction), viscosity 90mPa.s (measured at 25°C, 35% concentration).

[0066] E50: hydroxypropyl methylcellulose, with a methoxy substitution degree of 25%, a hydroxypropyl substitution degree of 11.5%, and a viscosity of 50 mPa.s (measured at 20° C. at a concentration of 2%).

[006...

Embodiment 3

[0076] Adopt the polymerization reactor identical with embodiment 1, used formula is as follows:

[0077] raw material name

Dosage / kg

VCM

1.45

DW

2.10

PVA(I)

0.00026

E50

0.00039

LE

0.00026

NG

0.00141

NaOH

0.000145

DEHA

0.000087

OE-Sn

0.00725(500ppm)

[0078] Note:

[0079] VCM: vinyl chloride monomer.

[0080] DW: desalinated water.

[0081] PVA (I): polyvinyl alcohol, alcoholysis degree 80% (mole fraction), viscosity 48mPa.s (measured at 20°C, 4% concentration).

[0082] E50: hydroxypropyl methylcellulose, with a methoxy substitution degree of 25%, a hydroxypropyl substitution degree of 11.5%, and a viscosity of 50 mPa.s (measured at 20° C. at a concentration of 2%).

[0083] LE: azobisisoheptanonitrile.

[0084] NG: 2-mercaptoethanol.

[0085] NaOH: sodium hydroxide.

[0086] DEHA: Diethylhydroxylamine.

[0087] Polymerization condi...

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Abstract

The invention relates to a polymerization reaction termination method, particularly a vinyl chloride monomer polymerization reaction system reaction termination method in suspension polymerization, which comprises the following steps: (1) initiating polymerization of a vinyl chloride monomer in a water phase in the presence of an initiator; and (2) when the conversion rate of vinyl chloride reaches 60-90%, adding a composition composed of a dialkyl-substituted hydroxylamine polymerization reaction terminator and an organotin heat stabilizer into the reaction system. The termination method is scientific and reasonable; and the adoption of the dialkyl-substituted hydroxylamine polymerization reaction terminator and organotin heat stabilizer can obtain the vinyl chloride resin product with quick polymerization termination effect and excellent heat stability, thereby satisfying most water-phase vinyl chloride suspension polymerization production requirements.

Description

technical field [0001] The invention relates to a polymerization reaction termination method, in particular to a reaction termination method of a vinyl chloride monomer polymerization reaction system in a suspension polymerization method. Background technique [0002] Among the various synthetic materials synthesized by artificial methods and polymerized from simple monomers, polyvinyl chloride and its homologues, such as chlorinated polyvinyl chloride and vinyl chloride copolymer plastics, have outstanding advantages. , such as good flame retardancy, wear resistance, chemical corrosion resistance, low gas and water vapor permeability, comprehensive mechanical properties, product transparency, electrical insulation, heat insulation, noise reduction, and shock resistance, are the existing performance-price ratios. The most superior general-purpose material occupies a special position in daily life and industrial fields, so it can be widely used in various industrial sectors a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F14/06C08F2/20C08F2/38C08L27/06C08K5/098C08K5/372
Inventor 张磊鲍春伟车万里朱卫东梁斌于永玲张立红张勇郭卫东袁锦慧
Owner CHINA PETROLEUM & CHEM CORP
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