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Low-temperature heat-sealing adhesive and preparation method thereof
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A low-temperature heat-sealing and emulsion technology, applied in adhesives, adhesive additives, polymer adhesive additives, etc., can solve problems such as difficult promotion and product adhesion
Pending Publication Date: 2021-11-30
HAINAN BNK WATER BASED NEW MATERIAL CO LTD
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The Chinese patent with the publication number CN103059213B relates to a low-temperature heat-sealing acrylic emulsion and its preparation method and application. The method is prepared by seed emulsion polymerization and adding an appropriate amount of microcrystalline paraffin after vacuum desorption. Sensitive food, but the heat sealing temperature of the emulsion coating reaches ≥12N / 15mm at 40-48°C. Since the sealing temperature of the product is too low, the ambient temperature of the product often exceeds 40°C during transportation, which is easy to Cause product adhesion, difficult to promote in the market
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[0049] The application also provides a preparation method for low-temperature heat-sealing glue, comprising the following steps:
[0050] Add water-based acrylic emulsion to water-based EAA emulsion according to the proportion, and then add water-based wax emulsion to obtain low-temperature heat-sealing glue;
[0051] The preparation method of described aqueous EAA emulsion is specifically:
[0052] According to the ratio, mix 10% soft water and emulsifier to obtain emulsifier solution;
[0053] Mix the remaining soft water, EAA copolymer, emulsifier solution and ammonia water, heat, and then add a curing agent to obtain an aqueous EAA emulsion;
[0054] The preparation method of described aqueous acrylic acid emulsion is specifically:
[0062] 1) Preparation of water-based EAA emulsion:
[0063] First add 10% soft water into the batching tank, then add the weighed emulsifier, start stirring to fully dissolve and mix, and make an emulsifier solution;
[0064] Add 90% soft water into the high-temperature and high-pressure reactor according to the weight ratio, then add the weighed EAA copolymer, emulsifier solution, and ammonia water, turn the stirring speed of the reactor to 2500-3000r / min, and turn on the heating. When the temperature reaches 95 After ~98°C, keep it warm for 1 hour, then keep constant temperature at this temperature and add the curing agent dropwise, keep dropping at a constant speed, control the time to finish adding dropwise within 0.5 hours, keep warm for 1 hour after adding the curing agent, let it stand for cooling, and filter out the material , to obtain an aqueous EAA emulsion with a solid content of 20-30%.
[0065] 2) Preparation of water-based acrylic emulsion:
[0066] Add soft w...
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Abstract
The invention provides a low-temperature heat-sealing adhesive. The low-temperature heat-sealing adhesive is prepared from a water-based acrylic emulsion, a water-based waxemulsion and a water-based EAA emulsion with specific contents. The invention further provides a preparation method of the low-temperature hot-sealing adhesive. The low-temperature heat-sealing adhesive provided by the invention is suitable for an aluminum foil, the aluminum foil is coated with the low-temperature heat-sealing adhesive, so that the heat-sealing performance of the aluminum foil is improved, the sealing temperature of the aluminum foil reaches 3.0 N / 15 mm at the temperature of 70 DEG C, the low-temperature heat-sealing performance is realized, the heat-sealing temperature is higher than the environment temperature of the aluminum foil in the transportation process, product adhesion is not caused, and a quite good anti-sticking effect is achieved while low-temperature heat sealing is guaranteed; and the low-temperature hot-sealing adhesive can be coated or smeared during use, and is quite suitable for flexible packaging of food sensitive to heat, such as candies and chocolates.
Description
technical field [0001] The invention relates to the technical field of polymer materials, in particular to a low-temperature heat-sealing glue and a preparation method thereof. Background technique [0002] Packaging heat-sealing adhesives are mainly used in fields such as daily chemical products, food packaging and liquid flexible packaging. Leakage is most likely to occur at the heat-sealed part of the package when the product is filled, and most of the damage to the packaging bag also occurs in the heat-sealed part during actual use. Therefore, it is particularly important to choose a suitable heat-sealed material with high heat-seal strength. The current packaging materials have poor low-temperature heat-sealing performance, and the sealing temperature is relatively high, at least above 100°C, which is difficult to meet the current needs of low-temperature heat-sealing packaging. [0003] The Chinese patent with the publication number CN103952095B discloses a high-tempe...
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