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Method for preparing porous structure polyvinyl chloride resin

A polyvinyl chloride resin, porosity technology, applied in the field of polyvinyl chloride, can solve the problems of insufficient surface and internal pores of resin particles, insufficient internal and external pore structure of resin, etc.

Active Publication Date: 2018-03-09
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of polyvinyl alcohol with a high degree of alcoholysis of 78~95%, the vinyl chloride monomer forms a graft polymer at the interface between the polyvinyl alcohol dispersant with a high degree of alcoholysis and the surface of the resin particles, resulting in no film on the surface of the PVC resin particles. At the same time, due to the high limit of the amount of water-dispersible low alcoholysis polyvinyl alcohol in the polymerization, the surface and internal pores of the resin particles are not fully formed, and the overall internal and external pore structure of the resin is still obviously insufficient.

Method used

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  • Method for preparing porous structure polyvinyl chloride resin
  • Method for preparing porous structure polyvinyl chloride resin
  • Method for preparing porous structure polyvinyl chloride resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Add 2.0kg of desalted water and 12.0g of 5.0% polyvinyl alcohol L-9 (KURARAY brand product, alcoholysis degree 69.5~72.5mol%, 4 % concentration aqueous solution viscosity is 6.0~6.5mPa s) aqueous solution, close the reaction kettle, replace the gas phase in the kettle with nitrogen, and pump the pressure in the kettle to less than -0.090MPa, add 1.0kg vinyl chloride monomer, start stirring, the speed Controlled at 480rpm, stirred and mixed at room temperature for 10 minutes, then added 0.22g cumyl peroxyneodecanoate (ACPND, produced by Akzo Nobel Tianjin Company, 75% isododecane solution), 0.64g peroxydicarbonate bis( 2-Ethylhexyl ester) (EHP, produced by Akzo Nobel Tianjin Company, 75% isododecane solution) and 1.0 g concentration of 5.0% polyvinyl alcohol LM-20 (product of KURARAY Company, alcoholysis degree 38~42mol%, 20 The viscosity of 4% aqueous dispersion at ℃ is 3.0~4.0 mPa·s) solution, continue to stir for about 5 minutes, raise the temperature of the kettle to ...

Embodiment 2

[0032] The polymerization operation method is the same as that of Example 1, except that 3.0 kg of desalted water and 18.0 g of 5.0% polyvinyl alcohol are used for the initial reaction (the degree of alcoholysis is 69.5 to 73.5 mol%, and the viscosity of a 4% aqueous solution at 20°C is 5.0 mPa•s ~7.2 mPa•s.) and 4.0g of polyvinyl alcohol LM-20 with a concentration of 5.0%, the temperature of the polymerization reaction is 60°C, and the reaction time is 4 hours; and the reaction is about 45 minutes (the conversion rate is about 16% ) when adding 2.86g of 35% polyvinyl alcohol (oil-soluble product, alcoholysis degree 36~42 mol %, viscosity of 35% methanol solution is about 89 mPa·s). The product performance analysis results are listed in Table 1.

Embodiment 3

[0034] The polymerization operation method is the same as in Example 1, except that 5.0 kg of desalted water, 10.0 g of 5.0% L-11 brand polyvinyl alcohol (KURARAY company brand product, alcoholysis degree 71.5~73.5 mol%, 20 ℃ 4% concentration aqueous solution viscosity is 5.5~7.5 mPa s) and 3.0g of 5.0% polyvinyl alcohol LM-10HD (KURARAY company product, alcoholysis degree 38~42mol%, 4% concentration aqueous solution viscosity at 20°C is 4.5 ~5.7mPa·s), the temperature of the polymerization reaction is 40°C, and the reaction time is 6 hours; and 11.43g of polyvinyl alcohol with a concentration of 35% (oil-soluble product, The degree of alcoholysis is 36~42 mol%, and the viscosity of 35% methanol solution is about 92mPa·s). The product performance analysis results are listed in Table 1.

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Abstract

The invention discloses a method for preparing a porous structure polyvinyl chloride resin and belongs to the technical field of polyvinyl chloride. The method comprises the following preparation processes: uniformly mixing water and a dispersant A, namely a vinyl chloride monomer, further adding a dispersant B and an initiator, and performing a polymerization reaction; when the reaction conversion rate is up to 10-30%, adding a dispersant C, and performing the polymerization reaction continuously, thereby obtaining the porous structure polyvinyl chloride resin, wherein the dispersant A is water-soluble polyvinyl chloride of which the alcoholysis degree is 69.5-73.5mol%; the use amount of the dispersant A accounts for 0.05-0.10wt% of the amount of the vinyl chloride; the dispersant B is water-dispersible polyvinyl chloride of which the alcoholysis degree is 38-42mol%; the use amount of the dispersant B accounts for 0.005-0.02wt% of the amount of the vinyl chloride; the dispersant C isoil-soluble polyvinyl chloride of which the alcoholysis degree is 36-42mol%; the use amount of the dispersant C accounts for 0.10-0.40wt% of the amount of the vinyl chloride. By adopting the method, apolyvinyl chloride resin product with a porous surface is prepared, and the product has rich surface pores and relatively large plasticizer absorption capacity.

Description

technical field [0001] The invention discloses a method for preparing polyvinyl chloride resin with a porous structure, belonging to the technical field of polyvinyl chloride. Background technique [0002] Polyvinyl chloride resin is one of the most commonly used plastic varieties, and the plastic products prepared by it can be widely used in many fields such as construction, agriculture, and chemical industry. The processing methods of polyvinyl chloride resin are various, and the formula is relatively complicated. Many additives need to be added, including heat stabilizers, lubricants, plasticizers, reinforcing agents, pigments, etc. The content of these additives in polyvinyl chloride resin powder is The absorption capacity and the degree of mixing have an important influence on the performance of processed products, while the surface and internal structure of resin particles and the degree of pore distribution are the main factors that determine the absorption capacity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F14/06C08F2/18C08F2/20
CPCC08F14/06C08F2/18C08F2/20
Inventor 张磊梁斌李留忠孙丽朋王晶张学明
Owner CHINA PETROLEUM & CHEM CORP