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Method for preparing diene rubber latex with large grain diameter

A technology of diene rubber and large particle size, which is applied in the field of polymer preparation and can solve problems such as equipment corrosion and increased COD in wastewater treatment

Active Publication Date: 2019-10-08
WANHUA CHEM (SICHUAN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the introduction of acidic raw materials, on the one hand, it caused equipment corrosion, and on the other hand, it increased the COD of wastewater treatment.
Based on known process methods, there is no report of agglomeration using inorganic bases

Method used

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  • Method for preparing diene rubber latex with large grain diameter
  • Method for preparing diene rubber latex with large grain diameter
  • Method for preparing diene rubber latex with large grain diameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Polymerization: Take 95 parts of butadiene, 5 parts of styrene, 1.3 parts of potassium oleate, 1.1 parts of potassium abietate,

[0037] 2.4 parts of 1,18-octadec-9-ene-dioic acid monopotassium salt, 0.45 parts of tert-dodecyl mercaptan, 0.3 parts of potassium persulfate, 0.36 parts of potassium bicarbonate, 0.24 parts of sodium pyrophosphate, deionized 145 parts of water was added into the reactor, the initial pH was about 10.5, and the polymerization reaction was carried out at 67°C. The reaction time was 11 hours, the conversion rate was 97%, and the polymerization reaction was completed. Small particle size latex particle size 100nm.

[0038] 2) Agglomeration: adding KOH solution to the above polybutadiene latex to pH 12.5, and stirring to obtain latex with large particle size.

[0039] 3) Products:

[0040] Particle size: 300nm.

Embodiment 2

[0042]1) Polymerization: Take 95 parts of butadiene, 5 parts of isoprene, 0.62 parts of potassium oleate, 0.72 parts of potassium abietate, 0.1 part of sodium lauryl sulfate, and monopotassium 1,18-octadecanedioate Add 0.36 parts of salt, 0.25 parts of tert-dodecyl mercaptan, 0.6 parts of potassium persulfate, 0.6 parts of potassium bicarbonate, 0.25 parts of potassium sulfate, 0.4 parts of potassium carbonate, and 90 parts of deionized water into the reaction kettle, and the initial pH About 11, the polymerization reaction was carried out at 65°C. The reaction time was 15 hours, the conversion rate was 91%, and the polymerization reaction was completed. Small particle size latex particle size 150nm.

[0043] 2) Agglomeration: adding KOH solution to the above polybutadiene latex until the pH is 14, stirring to obtain latex with large particle size.

[0044] 3) Products:

[0045] Particle size: 500nm.

Embodiment 3

[0047] 1) Polymerization: Take 95 parts of butadiene, 5 parts of styrene, 0.3 parts of potassium oleate, 0.6 parts of potassium abietate, 8.1 parts of monopotassium 1,12-dodecanedioic acid, tert-dodecyl mercaptan 0.3 parts, 0.3 parts of potassium persulfate, and 140 parts of deionized water were added into the reaction kettle, the initial pH was about 9, and the polymerization reaction was carried out at 67°C. The reaction time was 8 hours, and when the conversion rate was 96%, the polymerization reaction was completed. Small particle size latex particle size 70nm.

[0048] 2) Agglomeration: adding KOH solution to the above polybutadiene latex to pH 11.6, stirring to obtain latex with large particle size.

[0049] 3) Products:

[0050] Particle size: 200nm.

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Abstract

The invention relates to a method for preparing diene rubber latex with a large grain diameter. The method includes step 1, subjecting monomers to emulsion polymerization in the presence of an initiator, an emulsifier, a chain transfer agent, deionized water and an optional electrolyte and under the condition of the pH being 9-11.6 to obtain rubber latex with a small grain diameter, wherein the emulsifier is an anionic emulsifier and comprises 20-90% of C12-C18 dibasic acid monosodium or monopotassium salts; step 2, increasing the pH of the rubber latex with the small grain diameter to 11.6-14to turn the dibasic acid monosodium or monopotassium salts into disodium or dipotassium salts, and agglomerating the rubber latex with the small grain diameter to obtain the rubber latex with the large grain diameter. The method has the advantages of simplicity and convenience in operation, reduced COD in wastewater treatment and reduced equipment corrosion.

Description

technical field [0001] The invention belongs to the field of polymer preparation, in particular to a method for preparing large-diameter diene rubber latex. Background technique [0002] ABS resin is a ternary graft copolymer grafted from styrene and acrylonitrile to polybutadiene latex with large particle size (particle size is 250-350nm). Large particle size polybutadiene latex is the core component and skeleton of ABS resin, which endows ABS resin with toughness and directly affects the performance of ABS resin. There are two methods for synthesizing large particle size polybutadiene latex: one-step method and two-step method (agglomeration method). [0003] The one-step synthesis of polybutadiene latex with a particle size of 300nm usually has a longer reaction time, and the particle size growth rate is about 5-10nm / h. As described in CN200910237011.0, the large-particle polybutadiene latex particles produced by the one-step The average diameter is 250-350nm, and the p...

Claims

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Application Information

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IPC IPC(8): C08F236/10C08F212/08C08F222/02
CPCC08F236/10C08F212/08C08F222/02
Inventor 孙双翼韩强乔义涛
Owner WANHUA CHEM (SICHUAN) CO LTD
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