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Preparation method of high-barrier-performance vinylidene chloride and acrylonitrile copolymer latex

A technology of vinylidene chloride and acrylonitrile, which is applied in the field of preparation of high-barrier vinylidene chloride and acrylonitrile copolymer latex, can solve the problems of high crystallinity, poor stability, foaming and the like, and achieve stability Good results

Inactive Publication Date: 2013-07-24
NANTONG REPAIR AIR CHEM BIOENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the 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. Copolymerization composition, barrier properties and other issues, but failed to solve the problem of latex discoloration, making PVDC latex unable to be better popularized and applied in the field of food packaging
In addition, the current PVDC latex has poor stability, and some pastes are prone to appear when left for a certain period of time, and the crystallinity is too high, which affects its normal coating and use.

Method used

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  • Preparation method of high-barrier-performance vinylidene chloride and acrylonitrile copolymer latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 1600g of desalted water, 10.08g of sodium lauryl sulfate, 4.0g of octylphenol oxide vinyl ether, and 100g of seed latex into a 10L kettle, add 400g of vinylidene chloride and 45g of propylene after nitrogen pressure testing and vacuuming Acrylic acid and 5g of acrylic acid mixed monomer, after stirring evenly, the temperature was raised to 50°C, the pressure was 0.035Mpa, 2.0g of tert-butyl hydroperoxide, 3.5g of sodium formaldehyde sulfoxylate, and 0.03g of ferrous chloride solution were added dropwise to start polymerization When the polymerization conversion rate is about 30%, start to drop 400g vinylidene chloride, 45g acrylonitrile and 10g acrylic acid mixed monomer, 8.0g sodium lauryl sulfate and 4.0g octylphenol oxide vinyl ether mixed emulsifier solution, Control the polymerization conversion rate to about 70% and finish adding dropwise, keep the polymerization temperature constant until the polymerization pressure drops to 0.025Mpa, add ammonium laurate and ...

Embodiment 2

[0019] When preparing the copolymer latex, the emulsifier kind is changed into sodium lauryl sulfate and nonylphenol oxide vinyl ether, and the pressure and consumption are the same as in Example 1, and other process conditions are the same as in Example 1, and the copolymer latex is obtained, and the sample analysis The test results are shown in Table 1.

[0020] Table 1

[0021]

[0022] It can be seen from Table 1 that the copolymerized latex of the present invention has a long-term white color, does not turn yellow after coating, and has good stability. The obtained latex can be directly coated on the surface of substrates such as PP, PET, PVDC hard sheets, etc. Or the film formed after coating and drying has barrier properties, moisture resistance, fragrance retention, chemical resistance, flame retardancy, etc., and the coating film is transparent for a long time without yellowing.

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PUM

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Abstract

The invention relates to a preparation method of high-barrier-performance vinylidene chloride and acrylonitrile copolymer latex. The preparation method is characterized in that the raw material adopted in the preparation method comprises the following components in parts by weight: 90 to 96 parts of vinylidene chloride monomer, 3 to 5 parts of acrylonitrile monomer, 1 to 2 parts of acrylic acid functional monomer, 0.4 to 3 parts of compound emulsifier, 0.05 to 0.3 part of pH (Potential of Hydrogen) modifier, 0.05 to 0.5 part of initiator, 5 to 35 parts of seed latex, 0 to 3.0 parts of stabilizer, 0 to 3.0 parts of antioxidant, and 100 parts of water. The lax shows white color for a long term, cannot be yellowed after being coated, and has high stability; the prepared latex can be directly coated on the surfaces of substrates such as PP (Polypropylene) hard sheets, PET (Polyethylene Terephthalate) hard sheets and PVDC (Polyvinyl Dichloride) hard sheets; a film formed by coating the latex or formed through the coated and dried latex has barrier performance, moisture resistance, fragrance holding performance, resistance to chemical medicines, flame resistance, etc.; and the coated film is transparent and not yellowed for a long time.

Description

technical field [0001] The invention relates to a preparation method of high barrier vinylidene chloride and acrylonitrile copolymer latex. Background technique [0002] Polyvinylidene chloride (PVDC) copolymer latex is obtained by emulsion polymerization of vinylidene chloride (VDC) and acrylonitrile. It can be directly coated on the surface of the substrate and applied to BOPP, BOPET, PVC hard sheet, disposable Environmentally friendly tableware, paper packaging inner layer and other packaging for tobacco, food and pharmaceutical industries. The 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 constantly expanding, and the market share is constantly increasing. The market for coated PVDC films used in the packaging of fried foods, pastries, bis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F220/44C08F220/06C08F220/14C08F220/32C08F2/26C08F2/30C09D127/16
Inventor 姚炎华朱鹏葛亮孙玉蓉
Owner NANTONG REPAIR AIR CHEM BIOENG
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