Heat-seal polyvinylidene chloride emulsion used for coating, and preparation method thereof

A polyvinylidene chloride, heat-sealing technology, applied in the direction of coating, etc., can solve the problem of poor heat-sealing performance

Inactive Publication Date: 2013-01-02
HAINAN BNK WATER BASED NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] PVDC emulsion has been widely used as a high-barrier coating, but it is still limited in the field of food packaging that requires high heat-sealing strength. In view of the poor heat-sealing performance of this emulsion, the purpose of the present invention is to provide a heat-sealing coating for coating. Type PVDC emulsion and preparation method thereof, the innovation point is shown in two aspects, the one, when preparing modified PVDC copolymer emulsion, the ratio of acrylic acid monomer has been improved appropriately (in the mixed monomer required for preparing PVDC emulsion in the prior art, acrylic acid The content is only 0.5-10%), and added an appropriate amount of maleic acid

Method used

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  • Heat-seal polyvinylidene chloride emulsion used for coating, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Weigh 17 kg of vinylidene chloride, 15 kg of vinyl chloride, 18 kg of acrylic acid, 10 kg of maleic acid and 38 kg of demineralized water into a stainless steel container. Start stirring, the stirring speed is 120 rpm, and the temperature is slowly heated to 45°C. Then gradually add 0.17 kg of potassium persulfate, 0.33 kg of ammonium persulfate, and 1 kg of sodium dodecyl sulfonate. After 1 hour, the monomers are completely polymerized, the mixer is turned off, and the mixture is cooled and allowed to stand for 30 minutes. Add 0.17 kg of ethanol and 0.33 kg of octanol, start stirring again, and the stirring speed is 120 rpm. After 30 minutes, 100 kg of PVDC copolymer emulsion with a solid content of 62% is obtained.

[0028] 2. Take 95 kg of the prepared PVDC copolymer emulsion, put it into another stainless steel container, add 5 kg of EVA emulsion, start stirring, set the stirring speed to 120 rpm and the stirring time to 30 minutes, so that the two The copolymer...

Embodiment 2

[0032] 1. Weigh 20 kg of vinylidene chloride, 15 kg of vinyl chloride, 17 kg of acrylic acid, 10 kg of maleic acid and 36.3 kg of demineralized water into a stainless steel container. Start stirring, the stirring speed is 120 rpm, and the temperature is slowly heated to 48°C. Then gradually add 0.13 kg of potassium persulfate, 0.27 kg of ammonium persulfate, and 0.8 kg of sodium dodecyl sulfate. After 1 hour, the monomers are completely polymerized, turn off the mixer, and cool and stand for 30 minutes. Add 0.17 kg of ethanol and 0.33 kg of octanol, start stirring again, and the stirring speed is 120 rpm. After 30 minutes, 100 kg of PVDC copolymer emulsion with a solid content of 63.7% is obtained.

[0033] 2. Take 94 kg of the prepared PVDC copolymer emulsion, put it into another stainless steel container, add 6 kg of EVA emulsion, start stirring, set the stirring speed to 120 rpm, and set the stirring time to 30 minutes, so that the two The copolymer emulsion was thoroughly...

Embodiment 3

[0037] 1. Weigh 25 kg of vinylidene chloride, 14 kg of vinyl chloride, 16 kg of acrylic acid, 9 kg of maleic acid and 34.5 kg of demineralized water into a stainless steel container. Start stirring, the stirring speed is 120 rpm, and the temperature is slowly heated to 50 °C. Then gradually add 0.17 kg of potassium persulfate, 0.33 kg of ammonium persulfate, and 0.6 kg of OP-10. After 1 hour, the monomers are completely polymerized, turn off the mixer, cool and stand for 30 minutes. Add 0.13 kg of ethanol and 0.27 kg of octanol, start stirring again, and the stirring speed is 120 rpm. After 30 minutes, 100 kg of PVDC copolymer emulsion with a solid content of 65.5% is obtained.

[0038] 2. Take 92 kg of the prepared PVDC copolymer emulsion, put it into another stainless steel container, add 8 kg of EVA emulsion, start stirring, set the stirring speed to 120 rpm, and the stirring time to 30 minutes, so that the two The copolymer emulsion was thoroughly mixed to obtain 100 kg o...

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Abstract

The invention relates to a heat-seal polyvinylidene chloride emulsion used for coating, and a preparation method thereof. The paint is prepared from the raw materials of, by weight: 55-80% of modified PVDC latex blend, 0.1-1% of a stabilizer, 2.5-5% of a slip agent, 0.1-1% of an abherent, and 17.3-38% of softened water. The PVDC latex blend is prepared from mixed materials of 85-95% of PVDC copolymer emulsion and 5-15% of EVA emulsion. The PVDC copolymer emulsion is prepared through the steps that: four mixed monomers of 35-55% of vinylidene chloride, 10-15% of vinyl chloride, 15-20% of acrylic acid, and 5-10% of maleic acid are added into 0.2-0.5% of a chain initiator, 0.2-1% of an emulsifier, 14.5-18% of softened water, and 0.1-0.5% of an antifoaming agent; and is carried out, such that the PVDC copolymer emulsion is prepared. A coated film prepared by coating by using the emulsion has high heat-seal strength, wherein the heat-seal strength can reach 2.2-3.6N / 15mm. The film can be used in packaging of below 200g of light-weight snack food.

Description

technical field [0001] The invention relates to a heat-sealing polyvinylidene chloride (hereinafter referred to as PVDC) emulsion for coating and a preparation method thereof, belonging to the field of novel polymer materials. Background technique [0002] All bagged foods need to be heat-sealed. The weight of the food is different, and the requirements for the heat-sealing strength of the packaging bags are also different. Appropriate heat sealing strength can not only protect the quality of food, but also avoid problems such as seal bursting during filling, transportation, and placement of packaging bags. At present, most of the bag packaging adopts composite film (the heat sealing strength of ordinary composite film can reach 8-50N / 15mm). However, for lightweight packaging (food weight less than 200 grams), the heat sealing strength only needs to reach 2N / 15mm. If the composite film is still used, it will cause serious packaging waste, and it will also be time-consuming ...

Claims

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Application Information

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IPC IPC(8): C09D127/08C09D123/08C09D7/12C08F214/08C08F214/06C08F220/06C08F222/02
Inventor 朱清梅宋军军
Owner HAINAN BNK WATER BASED NEW MATERIAL CO LTD
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