Method for preparing polyvinylidene chloride and acrylic ester copolymerization latex

A technology of polyvinylidene chloride and vinylidene chloride is applied in the field of preparing high-barrier vinylidene chloride and acrylate copolymer latex copolymer latex, and can solve the problems of latex discoloration, poor stability, foaming and the like, achieve good stability

Inactive Publication Date: 2008-05-28
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, PVDC latex on the market has some unsatisfactory points. After coating, the surface of the film is easy to change color and foam, and cannot maintain a transparent and colorless state for a long time. The technologies disclosed in CN 1523164A and CN1294326C mainly solve the problem of copolymerization composition , barrier properties and other issues, but failed to solve the problem of latex discoloration, so that PVDC latex cannot be better promoted and applied in the field of food packaging
In addition, the current PVDC latex has poor stability, and some pastes are prone to appear after being left for a certain period of time, which affects its normal coating and use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of seed latex:

[0038] The polymerization reaction was carried out in a 10L tank with stirring as a layer of six-blade pitched paddles. The process conditions and process are briefly described as follows:

[0039] Put 1600g desalted water, 15.0g sodium dodecylbenzenesulfonate, 7.0g octylphenol oxide vinyl ether, 3.0g ammonium bicarbonate into the kettle, add 800g vinylidene chloride and 90g acrylic acid after nitrogen pressure test and vacuumize Methyl ester and 10g of acrylic acid mixed monomer, after stirring evenly, the temperature was raised to 55°C to start polymerization, the pressure was 0.1Mpa, and 2.0g of tert-butyl hydroperoxide, 3.5g of sodium formaldehyde sulfoxylate, and 0.03g of copper sulfate solution were added dropwise continuously, After the pressure dropped to 0.02Mpa, 5.0g of octylphenol oxide vinyl ether was added, and the unreacted monomer was recovered after stirring evenly. The slurry was recovered by steam stripping and filtered to...

Embodiment 2

[0044] When preparing seed latex and PVDC, the emulsifier kind is changed into: sodium lauryl sulfate, nonylphenol oxidized vinyl ether, the consumption is the same as in Example 1, and the pressure is 0.12Mpa. Other process conditions are the same as in Example 1, and the results are shown in Table 1.

Embodiment 3

[0046] When preparing seed latex and PVDC, sodium dihydrogen phosphate was used as a pH regulator in an amount of 4.0 g. It was added in the early stage of polymerization, and the pressure was 0.10 Mpa. The other process conditions were the same as in Example 1. The results are shown in Table 1.

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Abstract

The invention provides a preparation method of copolymerization latex of polyvinylidene chloride and acrylate, which comprises that reacts raw materials polyvinylidene chloride monomer, second monomer, functional monomer, composite emulsifier, pH adjuster, initiator, seed latex, and water in inertia gas, 0.08-0.12MPa and 50-60DEG C, collects polyvinylidene chloride and acrylate copolymerization latex from reaction product. The inventive PVDC latex is white stably, without changing into yellow after coating, with high stability. The latex can be directly coated on surface of base material as BOPP, BOPET and PVC hard sheet, while the coated or coated and dried film has barrier property, damp proofness, fragrance protectiveness, chemical drug resistance, and fireproof or the like. The film is transparent for long time, without changing into yellow. The inventive product can be used in one-time environment-friend dinnerware and inner layer of paper package, as tobacco, food and drug.

Description

technical field [0001] The invention relates to a method for polyvinylidene chloride and acrylate copolymer latex, in particular to a method for preparing high-barrier vinylidene chloride and acrylate copolymer latex copolymer latex by using an emulsion polymerization method. Background technique [0002] Polyvinylidene chloride (PVDC) copolymer latex is obtained by emulsion polymerization of vinylidene chloride (VDC) and acrylates. It can be directly coated on the surface of the substrate and applied to BOPP, BOPET, PVC hard sheet, one-time Packaging for tobacco, food and pharmaceutical industries such as non-toxic and environmentally friendly tableware, inner layer of paper packaging, etc. PVDC emulsion has excellent barrier properties to oxygen and water (steam). [0003] The high-barrier packaging coating film of polyvinylidene chloride can also be used for the packaging of cigarettes and medicines. With continuous improvement, the application fields of food films are c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/08C08F2/24C08F2/38C08F4/40C08F220/10
Inventor 缪晖袁茂全张龙弟张月芳
Owner SHANGHAI CHLOR ALKALI CHEM
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