Low-temperature heat sealing EVA emulsion, and preparation method and use thereof

A low-temperature heat-sealing and emulsion technology, which is applied in the direction of coating, etc., can solve the problems of poor low-temperature heat-sealing performance, large damage, and high sealing temperature, and achieve good heat-sealing uniformity, reduced production energy consumption, and good stability Effect

Inactive Publication Date: 2018-05-29
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

[0002] Today, with the accelerated pace of life or work, foods such as candy and chocolate need high-speed packaging, but the current packaging materials have poor low-temperature heat-sealing performance, and the low-temperature heat-sealing temperature is high, requiring more than 100°C, which cannot meet the current high-speed packaging requirements. need
Patent CN103952096A relates to a low-temperature heat-sealing adhesive and its preparation method. The latex is composed of the following components: VEA emulsion 20-24, styrene-butadiene emulsion 12-14, propylene styrene emulsion 18-20, acrylic acid 6-8, butene di Anhydride 5-6, ethylene glycol 12-14, sodium petroleum sulfonate 1-2, aminopropyltriethoxysilane 4-6, vinyl acetate 2-3, polyvinyl alcohol 2-3, diethanolamine 1- 2. tert-butyl hydroperoxide 1-2, thickening additive 4-5, butyl acetate 40-50, the heat sealing temperature of this latex is 105 ℃, it will cause great damage to the food in the packaging of candy, chocolate, etc. And energy consumption is big; CN106459456A relates to a kind of low-temperature heat-seal coating based on solvent, and this solution comprises amorphous or semi-crystalline polyester or copolyester resin, tackifier, anti-blocking agent and solvent, and this heat-seal coating is in conventional Under the equipment and conditions, the sealing temperature is 70°C. The preparation process requires the use of solvents, which cannot meet the increasingly stringent environmental protection requirements. Therefore, it is urgent to develop a water-based low-temperature heat-sealing emulsion suitable for high-speed packaging.
[0003] Aiming at the disadvantages of high sealing temperature and inability to meet environmental protection requirements in the existing heat-sealing materials proposed above, the present invention provides a water-based low-temperature heat-sealing EVA emulsion and a preparation method thereof

Method used

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  • Low-temperature heat sealing EVA emulsion, and preparation method and use thereof
  • Low-temperature heat sealing EVA emulsion, and preparation method and use thereof
  • Low-temperature heat sealing EVA emulsion, and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]

[0026] 1. Preparation of raw materials:

[0027] (1) Add 75kg of soft water and 4kg of initiator in the No. 1 batching tank, stir at 800r / min after heating up to 75°C, and make an initiator solution and keep it warm.

[0028] (2) Add 75kg of demineralized water and 7kg of emulsifier in No. 2 batching tank, stir with 800r / min after heating up to 75°C, make emulsifier solution and keep it warm.

[0029] (3) Add 225kg soft water, 50kg EVA copolymer, 20kg amino resin, 24kg acrylic acid and 15kg polyvinyl alcohol in the reactor.

[0030] 2. Coating emulsification reaction:

[0031] (1) Close the inlet and outlet valves of the reactor, turn on the vacuum pump to evacuate the reactor, and when the pressure reaches -0.08MPa, pass nitrogen to normal atmospheric pressure, and replace it 3 times by vacuuming→adding nitrogen→vacuumizing. The oxygen in the reactor was completely purged.

[0032] (2) The reaction kettle is turned on and heated, and stirred at a stirring speed...

Embodiment 2

[0035]

[0036] 3. Preparation of raw materials:

[0037] (1) Add 30.4kg of soft water and 2kg of initiator into the No. 1 batching tank, stir at 800r / min after heating up to 80°C, and make an initiator solution and keep it warm.

[0038] (2) Add 30.4kg of soft water and 2.4kg of emulsifier in No. 2 batching tank, stir at 800r / min after heating up to 80°C, make emulsifier solution and keep it warm.

[0039] (3) Add 91.2kg of soft water, 19kg of EVA copolymer, 8kg of amino resin, 9.6kg of acrylic acid and 5.4kg of polyvinyl alcohol in the reactor.

[0040] 4. Coating emulsification reaction:

[0041] (1) Close the inlet and outlet valves of the reactor, turn on the vacuum pump to evacuate the reactor, and when the pressure reaches -0.08MPa, pass nitrogen to normal atmospheric pressure, and replace it 3 times by vacuuming→adding nitrogen→vacuumizing. The oxygen in the reactor was completely purged.

[0042] (2) The reaction kettle is turned on and heated, and stirred at a ...

Embodiment 3

[0045]

[0046] 5. Preparation of raw materials:

[0047] (1) Add 53.9kg of soft water and 2.1kg of initiator in the No. 1 batching tank, stir at 800r / min after heating up to 60°C to make an initiator solution and keep it warm.

[0048] (2) Add 53.9kg of soft water and 5.25kg of emulsifier in No. 2 batching tank, stir at 800r / min after heating up to 60°C, make emulsifier solution and keep it warm.

[0049] (3) Add 161.7kg of soft water, 33.95kg of EVA copolymer, 11.9kg of amino resin, 12.25kg of acrylic acid and 10.5kg of polyvinyl alcohol in the reactor.

[0050] 6. Coating emulsification reaction:

[0051] (1) Close the inlet and outlet valves of the reactor, turn on the vacuum pump to evacuate the reactor, and when the pressure reaches -0.08MPa, pass nitrogen to normal atmospheric pressure, and replace it 3 times by vacuuming→adding nitrogen→vacuumizing. The oxygen in the reactor was completely purged.

[0052](2) The reaction kettle is turned on and heated, and stirr...

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Abstract

The invention provides a low-temperature heat sealing EVA emulsion which is prepared by high temperature and high pressure emulsification of the following components in parts by weight according to 100 parts: 7.2-10.5 parts of an ethylene-vinyl acetate copolymer (called an EVA copolymer for short), 2-4 parts of amino resin, 3-4.8 parts of acrylic acid, 2-3 parts of polyvinyl alcohol, 0.3-0.6 partof an antiblocking agent, 0.8-1.5 parts of an emulsifier, 0.1-0.5 part of a defoaming agent, 0.5-0.8 part of an initiator, 0.1-0.3 part of a pH regulator, and 75-80 parts of soft water. The heat sealing temperature of the low-temperature heat sealing EVA emulsion is 75 DEG C, the emulsion stability is good, the emulsion particle uniformity is good, the heat sealing uniformity is good, and the energy consumption of production can be effectively reduced; the emulsion is a water-based emulsion, has no need of organic solvents, is environmentally friendly, pollution-free, safe and reliable, and isquite suitable for high-speed packaging for foods such as candies and chocolate which need low-temperature heat sealing.

Description

technical field [0001] The invention provides a low-temperature heat-sealing EVA emulsion, a preparation method and application thereof, and belongs to the field of polymer materials. Background technique [0002] Today, with the accelerated pace of life or work, foods such as candy and chocolate need high-speed packaging, but the current packaging materials have poor low-temperature heat-sealing performance, and the low-temperature heat-sealing temperature is high, requiring more than 100°C, which cannot meet the current high-speed packaging requirements. need. Patent CN103952096A relates to a low-temperature heat-sealing adhesive and its preparation method. The latex is composed of the following components: VEA emulsion 20-24, styrene-butadiene emulsion 12-14, propylene styrene emulsion 18-20, acrylic acid 6-8, butene di Anhydride 5-6, ethylene glycol 12-14, sodium petroleum sulfonate 1-2, aminopropyltriethoxysilane 4-6, vinyl acetate 2-3, polyvinyl alcohol 2-3, diethanol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/00C08F291/12C08F291/08C08F220/06C09D123/08C09D161/28C09D161/24C09D161/22C09D129/04C09D7/61C09D7/65C09D7/63
CPCC08F255/02C08F261/04C08F283/00C08L2205/03C09D123/0853C08L61/28C08L61/24C08L61/22C08L29/04C08L91/06C08K3/36C08K3/34C08K5/053
Inventor 黄宏存符誉龄
Owner HAINAN BNK WATER BASED NEW MATERIAL CO LTD
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