Suspension polymerization method for polyvinyl chloride (PVC)

A technology of suspension polymerization and polyvinyl chloride, which is applied in the field of polymer synthesis, can solve the problems of large residual amount of dispersant, abnormal dispersion system, accumulation of dispersant, etc.

Active Publication Date: 2019-08-02
杰瑞德工业设备(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] With the passage of time, many other problems have gradually emerged during the application of centrifuge mother liquor reuse technology. The application of the treatment method proposed in the above patent documents makes it difficult for the centrifuge mother liquor to be reused in polymerization production:
[0011] A. ATSC is a highly toxic substance and cannot be used in the production of polyvinyl chloride for food and medical purposes. In order to further improve the thermal stability of the resin, other components such as hindered phenol antioxidants need to be added to the terminator. Most of them use diethylhydroxylamine and hindered phenol composite non-toxic and environmentally friendly terminators, and no longer use the ATSC terminator disclosed in CN1654486A; and in order to shorten the reaction time and increase production capacity, most of them now use EHP and more efficien

Method used

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  • Suspension polymerization method for polyvinyl chloride (PVC)
  • Suspension polymerization method for polyvinyl chloride (PVC)
  • Suspension polymerization method for polyvinyl chloride (PVC)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0102] As a kind of embodiment of the present invention, polyvinyl chloride suspension polymerization method implementation process is as follows:

[0103] like figure 1 As shown in the process flow diagram, add vinyl chloride monomer, purified centrifuge mother liquor 19, other components and additives, including initiator, defoamer, buffer, dispersant and antioxidant, etc. Vinyl chloride suspension polymerization assistant. Polymerization is carried out at 35-75°C, preferably 45-70°C, to produce SG-1 to SG-8 polyvinyl chloride resins. When the target conversion is reached, the terminator is added. Blowdown and unreacted monomer recovery operations are then performed.

[0104] The unreacted monomer 3 in the polymerizer 1 is sent to the recovery system (not shown), the polymerized reaction mixture slurry 2 produced in the polymerizer 1 is sent to the stripper 5, and the unreacted monomer 6 is sent to the recovery system ( not shown), the degassed reaction mixture slurry 7 ...

Embodiment 1

[0109] Carry out polyvinyl chloride suspension polymerization with aforementioned polymerization flow process, wherein, polymerization monomer is vinyl chloride, and initiator is cumyl peroxyneodecanoate (CNP) and bis(2-ethylhexyl) peroxydicarbonate ( EHP), the dispersant is Japanese Kuraray polyvinyl alcohol PVA-224E and L-10 and hydroxypropyl methylcellulose (HPMC), and suspension polymerization is carried out at a polymerization temperature of 57°C to produce SG-5 polyvinyl chloride resin. The amount of addition of each material is listed in Table 1. When the target conversion rate is reached, a terminator is added to end the current round of polymerization, and then discharge and unreacted monomer recovery operations are performed.

[0110] like figure 1 As shown in the process flow diagram, the slurry with a solid content of about 20% is pumped into the mixing tank (not shown) from the bottom of the stripping tower, and then pumped into the centrifuge from the mixing tan...

experiment example 1

[0126] Experimental example 1 centrifuge mother liquor stability test

[0127] The quality of the filtered centrifuged mother liquor was monitored, and the results are listed in Table 2. From the test results of various indicators of the centrifuged mother liquor in Table 2, it was found that after repeated use of multiple batches, the test data of each index of the centrifuged mother liquor basically remained unchanged, indicating that the reuse stability of the centrifuged mother liquor was good.

[0128] Wherein, the concentration of the polymerization inhibitory component adopts the titration analysis method among the present invention to measure; The solid content before and after filtration adopts the gravimetric method to measure, specifically as follows:

[0129] (1) Required instruments and equipment: vacuum pump, Buchner funnel, suction filter bottle, oven, analytical balance, etc.

[0130] (2) Step: Dry the filter paper (permeate pore size ≤ 0.1 μm) in an oven at 5...

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Abstract

The invention relates to a suspension polymerization method for PVC. The method comprises the following steps: a) adding a terminator to a PVC suspension polymerization system to terminate polymerization, performing centrifugation and separation and purifying a suspension polymerized aqueous-phase reaction mixture to obtain centrifugal mother liquor; b) taking the centrifugal mother liquor as a reaction raw material to be recycled to the PVC suspension polymerization system to carry out polymerization continuously; c) repeating the steps a) and b), wherein in the step a), controlling the equivalent concentration of polymerization inhibiting components in the centrifugal mother liquor at 7.8*10<-6>N to 3.1*10<-5>N. The method can accurately analyze the concentration and the residual dispersion amount of the polymerization inhibiting components in the centrifugal mother liquor, and remove obstacles for the reuse of the centrifugal mother liquor in the PVC suspension polymerization system, so that the centrifugal mother liquor can be efficiently reused in the suspension polymerization, thereby not only saving a lot of deionized water and further recycling a large amount of thermal energy and PVC resin and additives and being obvious in energy-saving effect, in addition, the production cost of PVC can be significantly reduced and economic benefits are good.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a polyvinyl chloride suspension polymerization method. Background technique [0002] Polyvinyl chloride (PVC) resin is generally a resin produced by the homopolymerization of vinyl chloride monomer or the copolymerization of more than 50 wt.% of vinyl chloride and other monomers that can be copolymerized with vinyl chloride. Polyvinyl chloride resin is cheap and easy to adjust the hardness, so it can be processed by most processing methods. In addition, since polyvinyl chloride-based resins have various physical and chemical properties such as excellent mechanical strength, weather resistance, and chemical resistance, they are widely used in various products such as building materials, household goods, automotive interiors, furniture, etc. wait. [0003] More than 80% of polyvinyl chloride resins worldwide are produced by suspension polymerization. The production of polyvinyl ...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F2/18C08F2/20C08F2/38
CPCC08F2/18C08F2/20C08F2/38C08F114/06
Inventor 薛之化
Owner 杰瑞德工业设备(北京)有限公司
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