Preparation method of PVDC composition by VDC/MA copolymerization

A composition and copolymerization technology, which is applied in the field of preparation of PVDC compositions, can solve the uninvolved and other problems, and achieve the effects of white film surface color, good processing thermal stability, and improved thermal processing stability.

Active Publication Date: 2009-11-18
ZHEJIANG QUZHOU JUSU CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can improve the thermal stability and processability of resin to a certain extent; But all do not relate to adopting to change polymerization temperature and agitation speed to prepare the preparation method of the good VDC / MA copolymerized PVDC composition of processing thermal stability in polymerization process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of VDC / MA copolymerization PVDC composition comprises the steps:

[0031] (1) In a 100L stainless steel polymerization kettle (length-to-diameter ratio is 2:1, double-layer two-leaf 45° oblique paddle), drop 55kg deionized water, 4g disodium edetate, 55g methyl cellulose ether, 25g sodium pyrophosphate, 180g epoxy linseed oil, 90g tert-butyl peroxide-2-ethylhexanoate, 15g lauryl peroxide, 31.85kg vinylidene chloride, 3.15kg methyl acrylate after cold dispersion for 30 minutes, Rapidly raise the temperature to 65°C at a stirring speed of 120rpm to start polymerization;

[0032] (2) After stirring at a speed of 12.5rpm / h and 3.75°C / h, the temperature was raised to 80°C and 170rpm, and at a speed of 170rpm, the temperature was raised to 90°C at a speed of 5°C / h. After 1.5 hours of constant temperature reaction, the polymerization was terminated. Remove residual monomers, cool down to 55°C, discharge, centrifuge, and dry;

[0033] (3) Add 60g of ste...

Embodiment 2

[0036] Repeat Example 1, the difference between this embodiment and Example 1 is that the components of the mixed monomers are:

[0037] (1) Vinylidene chloride (VDC) 31.5kg

[0038] (2) Methyl acrylate (MA) 3.5kg

[0039](3) Chelating agent: disodium cycloethylene diamine tetraacetate (DCTA) 4g

[0040] (4) Heat-stable plasticizer: epoxy soybean oil 0.8kg

[0041] The polymerization reaction time is 7.5h.

[0042] Result: the obtained weight average molecular weight (M W ) is a copolymerized PVDC composition of 79375, the molecular weight dispersion index is 2.158, and the viscosity value is 1.414.

Embodiment 3

[0044] Repeat Example 1, the difference between this embodiment and Example 1 is that the components of the mixed monomers are:

[0045] (1) Vinylidene chloride (VDC) 32.55kg

[0046] (2) Methyl acrylate (MA) 3.5kg

[0047] (3) Interface layer improver: chlorinated polyethylene 3kg

[0048] (4) Lubricant: stearic acid amide 50g

[0049] Oleamide 50g

[0050] The polymerization reaction time is 7.5h.

[0051] Result: the obtained weight average molecular weight (M W ) is a copolymerized PVDC composition of 88458, the molecular weight dispersion index is 2.392, and the viscosity value is 1.481.

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Abstract

The invention provides a preparation method of a PVDC composition by VDC / MA copolymerization. The preparation method comprises the following steps: putting mixing monomer, chelating agent, dispersing agent, deionized water, pH regulator, thermostability plasticizing agent and composite initiating agent into a polymeric kettle, carrying out cold dispersion on the mixture for 30 minutes, starting polymerization when raising temperature fast to 65 DEG C at the agitator speed of 120rpm, then stirring at the speed of 8rpm / h to 20rpm / h and 3 DEG C / h to 5 DEG C / h and raising the temperature to 80 DEG C to 85 DEG C at the agitator speed of 170rpm to 180rpm, finally at the agitator speed of 170rpm to 180rpm, raising the temperature to 90 DEG C at the speed of 2.5 DEG C / h to 6 DEG C / h, reacting for 1h to 2h at constant temperature, stopping polymerization, separating residual monomer in vacuum, reducing temperature, discharging materials, centrifugating, drying, adding post processing auxiliary agent, raising the temperature to 80 DEG C at the speed of 25 DEG C / h to 30 DEG C / h, mixing, curing and obtaining the composition. The PVDC composition has good forming processing thermostability and can be used for packing low-and-medium temperature food by multi-layer coextrusion film or coextrusion casting film.

Description

technical field [0001] The invention relates to a preparation method of a PVDC composition, more specifically, to a preparation method of a VDC / MA copolymerized PVDC composition. Background technique [0002] The main component of polyvinylidene chloride (PVDC for short) is vinylidene chloride (VDC). Due to its symmetrical molecular structure and the presence of hydrophobic chlorine, it has high crystallinity and melting point. Oxygen performance is good, and the gas barrier property is not affected by ambient humidity, widely used in food, medicine, military industry and other fields. The disadvantage is poor thermal stability. It is easy to decompose and release hydrogen chloride at the processing temperature to form olefin chains, resulting in discoloration of the product. At the same time, these olefin chains form many cross-linked network structures. This structure is insoluble in any solvent and difficult to melt. During processing, it often adheres to the surface of ...

Claims

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Application Information

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IPC IPC(8): C08F214/08C08F2/10C08K5/00C08K5/1515
Inventor 祝龙信陈繁荣韩金铭舒文晓苏兰辉
Owner ZHEJIANG QUZHOU JUSU CHEM IND CO LTD
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