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VDC/MA copolymerized PVDC composition

A composition and copolymerization technology, applied in the field of VDC/MA copolymerized PVDC composition, can solve problems such as not being completely satisfactory, and achieve the effect of white film surface color, improved thermal stability and processing performance

Active Publication Date: 2009-10-21
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

Although the thermal stability and processability of PVDC resins obtained by these methods have been improved to a certain extent, they are not completely satisfactory. People hope to develop PVDC resin products with better thermal stability and processability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A VDC / MA copolymerized PVDC composition, its raw material formula is as follows;

[0036] Vinylidene chloride (VDC) 31.85kg

[0037] Methyl acrylate (MA) 3.15kg

[0038] Deionized water: 55kg

[0039] pH regulator: sodium pyrophosphate 25g

[0040] Initiator: tert-butyl peroxy-2-ethylhexanoate 90g

[0041] Lauryl Peroxide 15g

[0042] Dispersant: methyl cellulose ether 55g

[0043] Chelating agent: disodium ethylenediaminetetraacetic acid (EDTA) 4g

[0044] Heat stable plasticizer: epoxy linseed oil 0.8kg

[0045] Lubricant: Stearic Acid Amide 60g

[0046] Oleamide 30g

[0047] Interface layer improver: ethylene-vinyl acetate copolymer (EVA) 2kg

[0048] The preparation steps are as follows:

[0049] In a 100L stainless steel polymerization kettle (length-to-diameter ratio: 2:1, double-layer two-leaf 45° oblique paddle), put 55kg of deionized water, 4g of disodium edetate, 55g of methyl cellulose ether, and 25g of pyrophosphoric acid Sodium, 180g epoxy linsee...

Embodiment 2

[0052] Repeat embodiment 1, the difference between the present embodiment and embodiment 1 is that following components are:

[0053](1) Vinylidene chloride (VDC) 31.5kg

[0054] (2) Methyl acrylate (MA) 3.5kg

[0055] (3) Chelating agent: disodium cycloethylene diamine tetraacetate (DCTA) 4g

[0056] (4) Heat-stable plasticizer: epoxy soybean oil 0.8kg

[0057] 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

[0059] Repeat embodiment 1, the difference between the present embodiment and embodiment 1 is that following components are:

[0060] (1) Vinylidene chloride (VDC) 32.55kg

[0061] (2) Methyl acrylate (MA) 3.5kg

[0062] (3) Interface layer improver: chlorinated polyethylene 3kg

[0063] (4) Lubricant: stearic acid amide 50g

[0064] Oleamide 50g

[0065] 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 discloses a VDC / MA copolymerized PVDC composition, which comprises the following components in portion by weight: 88 to 95 portions of vinylidene chloride monomer, 5 to 12 portions of methyl acrylate monomer, 0.005 to 0.02 portion of chelating agent, 0.05 to 0.25 portion of dispersant, 0.03 to 0.12 portion of pH modifying agent, 0.30 to 4.0 portions of thermal stability plasticizing agent, 0.15 to 0.40 portion of evocating agent, and 2.33 to 14.5 portions of post processing assistant. The weight average molecular weight MW of the composition is 75,000 to 90, 000. The VDC / MA copolymerized PVDC composition solves the problem that a PVDC resin has poor post processing thermal stability and is easy to decompose and change colors, and can keep the luster of an membrane surface unchanged for long term when the composition as a multilayer co-extrusion membrane or a co-extrusion cast membrane is used for packing low-medium temperature food.

Description

technical field [0001] The present invention relates to a PVDC composition, more specifically, to 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 the screw to form carbonization points, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/08C08K5/00C08K5/1515
Inventor 韩金铭陈繁荣舒文晓祝龙信苏兰辉
Owner ZHEJIANG QUZHOU JUSU CHEM IND CO LTD
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