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High rubber content MBS emulsion after-treatment technology

A technology of rubber content and post-treatment, applied in the field of post-treatment process of MBS emulsion with high rubber content, can solve the problems of difficult post-treatment process, poor flow performance, difficult operation, etc., so as to save industrial desalination water and save post-treatment. equipment, the effect of reducing production costs

Active Publication Date: 2009-01-21
SHANDONG DONGLIN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, not only the polymerization process of MBS resin is complicated, but also the post-treatment process of preparing dry powder is even more difficult.
The existing technologies have problems such as long process flow, difficult operation, irregular shape of MBS resin powder particles, poor flow performance, wide particle size distribution and small bulk density in the existing technologies.
Moreover, because the coagulation process requires a large amount of desalinated water, coagulants and dispersants, etc.; a large amount of wastewater containing coagulants, dispersants and MBS fine powders produced can only be discharged after multiple treatments, so the production cost is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: First, add a certain proportion of ion-free water into the pressure polymerization kettle, then add quantitative styrene, butadiene and the required polymerization aids in sequence, and carry out the first step of polymerization. After 8-12 hours, the styrene-butadiene latex was obtained. Then add a certain amount of monomers such as styrene and methyl methacrylate and the required graft polymerization assistants to the styrene-butadiene latex, and carry out multiple graft polymerizations at the above temperature. After 4 to 8 hours, the An MBS emulsion with a rubber content of 60% (in mass percentage, the same below) and a solid content of 40% (in mass percentage, the same below) was obtained.

[0013] The emulsion was dried when the inlet temperature of the spray drying tower was 160°C and the pressure of the delivery pump was controlled at 3.0Mpa. The properties of the obtained MBS resin powder were shown in Table 1.

Embodiment 2

[0014] Embodiment 2: Polymerization process is the same as embodiment 1. The emulsion was dried when the inlet temperature of the spray drying tower was 180°C and the pressure of the delivery pump was controlled at 3.0Mpa. The properties of the obtained MBS resin powder were shown in Table 1.

Embodiment 3

[0015] Embodiment 3: Polymerization process is the same as embodiment 1. The emulsion was dried when the inlet temperature of the spray drying tower was 140°C and the pressure of the delivery pump was controlled at 3.5Mpa. The properties of the obtained MBS resin powder were shown in Table 1.

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PUM

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Abstract

The invention relates to a process of post treating MBS emulsion containing high amount of rubber. Said MBS emulsion containing high amount of rubber is emulsion polymerized to get MBS emulsion with rubber concentration being 40-80% and solid concentration being 20-60%. It is characterized in that the MBs emulsion is dried by pressure type spray dryer to get MBS resin powder. The inlet temperature of drying tower is controlled between 120- 200 Deg. C, and the pressure of transfer pump is controlled between 2.0- 5.0 Mpa. The invention is characterized by short process, high productivity, high bulk density of powder, no addition of coagulating agent, saving of a large amount of industrial desalinization water, saving complicate post treatment device, no industrial wastewater and great lowered production cost.

Description

technical field [0001] The invention relates to a post-treatment process of MBS emulsion with high rubber content. Background technique [0002] As we all know, MBS resin (methyl methacrylate-butadiene-styrene terpolymer) is a "core-shell" structure polymer containing a rubber phase, which is mainly used for the toughening of polyvinyl chloride (PVC) modified. Because the more rubber phase the MBS resin contains, the better the toughening effect on PVC is, so the rubber content of the general MBS resin will not be lower than 40% (mass percentage, the same below). However, since the higher the rubber content, the lower the glass transition temperature, the easier it is to produce sticking and agglomeration during the drying process, so the post-treatment process has always been a difficult problem for MBS resin manufacturers, and it has also been a research hotspot. At present, most of the synthetic methods at home and abroad adopt multi-step emulsion polymerization, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/14C08F6/14
Inventor 卢晓路玉滨路玉海
Owner SHANDONG DONGLIN NEW MATERIALS CO LTD