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Hot melt adhesive

A hot-melt adhesive and weight technology, applied in the direction of adhesives, wax adhesives, etc., can solve the problems of exceeding the standard and non-compliance, and achieve the effect of saving process energy consumption, high bonding strength, and improving production efficiency.

Inactive Publication Date: 2014-05-07
广州德渊精细化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the layer closest to the food is often the layer of hot melt adhesive, which is often dissolved by solvents (such as: n-hexane, n-heptane, xylene, etc.), resulting in exceeding the standard and not complying with existing regulations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1 main bonding agent is ethylene-vinyl acetate copolymer

[0073] A hot melt adhesive, see Table 1 for specific components and contents.

[0074] EVA1~EVA6 in Table 1 are different kinds of ethylene-vinyl acetate copolymers, wherein the proportion of vinyl acetate to the weight of ethylene-vinyl acetate copolymers is represented by VA%, and the individual melt index (Melting Index, MI; MI value The higher the value, the better the liquidity).

[0075] Then the strength is tested by the Chinese QB / T2358-98 test method.

[0076] The evaporation residue of n-hexane is tested according to the Chinese GB / T5009.60-2003 test method.

[0077] Table 1 Hot melt adhesives of different formulations and their properties

[0078]

[0079]

[0080] It can be seen from Table 1: in the 1-1 and 1-2 formulas, the content of the diluent polypropylene wax is relatively high, no tackifying resin is added, and the 1-1 formula with a low content of ethylene-vinyl acetate co...

Embodiment 2

[0082] Embodiment 2 main binding agent is ethylene-methacrylate copolymer

[0083] A hot melt adhesive, see Table 2 for specific components and contents.

[0084] EMMA1 to EMMA4 in Table 2 are different types of ethylene-methacrylate copolymers, where the ratio of methacrylate to the weight of ethylene-methacrylate copolymers is represented by MMA%, and individual MI values ​​are listed. Then the strength is tested by the Chinese QB / T2358-98 test method. The evaporation residue of n-heptane is tested according to the method specified in Article 6 of Taiwan's Food Utensil Container Packaging Hygienic Standard. The n-hexane extract and xylene solubles are tested in accordance with the relevant regulations of US 21CFR, 177.1520.

[0085] Table 2 Hot melt adhesives of different formulations and their properties

[0086]

[0087]

[0088] It can be seen from Table 2 that the adhesion strength of 2-1~2-3, 2-6 and 2-8 without adding tackifying resin is 2.12-9.12N / 10mm, among...

Embodiment 3

[0090] Application of embodiment 3 hot melt adhesive in sealing material

[0091] 1. The structure of the sealing material

[0092] refer to figure 1 , which is the sealing material 100. The sealing material 100 includes a metal foil 102 , a coating 104 and the hot melt adhesive 106 obtained in Example 1 or 2.

[0093] Wherein, the metal foil 102 may be commonly used aluminum foil. Aluminum foil can react with oxygen in the air to form a protective layer of aluminum oxide, thereby blocking the moisture in the air.

[0094] The material of the coating film 104 can be polyethylene (PE) or polypropylene (PP). The coating film 104 can prevent chemical reaction between the food and the metal foil 102 , and can improve the adhesion of the hot melt adhesive 106 to the metal foil 102 .

[0095] The hot melt adhesive 106 is used to provide adhesion between the sealing material 100 and the food container by hot pressing. The hot-melt adhesive 106 is coated on the coating film 104 ...

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Abstract

The invention discloses a hot melt adhesive, comprising an ethylene-vinyl acetate copolymer and a thinner, wherein the ethylene-vinyl acetate copolymer accounts for from 20% to 90% of the hot melt adhesive by weight. The hot melt adhesive is high in bonding strength, has a good anti-solubility property to high-solubility solvent, accords with related food provisions, and is suitable for food packaging. In addition, the hot melt adhesive is high in thermal activation. A sealing material made of the hot melt adhesive can be subjected to thermal compression at a low temperature, thereby achieving an energy-saving effect. Moreover, the hot melt adhesive is characterized by rapid drying, so that in the process of manufacturing the sealing material, additional drying equipment is not required, and the production efficiency is improved further and the processing energy consumption is reduced.

Description

technical field [0001] The invention relates to a hot melt adhesive, in particular to a hot melt adhesive used for food packaging. Background technique [0002] Sealing sheets are widely used on food packaging containers to increase the airtightness of the packaging and isolate the food from the outside world. Accordingly, it is possible to avoid chemical changes or contamination of food due to direct contact with air or other substances in the environment. [0003] A common sealing sheet for food packaging is a metal foil-based sealing sheet, especially an aluminum foil-based sealing sheet. This type of sealing sheet usually includes a multi-layer structure of metal foil, extrusion lamination and hot melt adhesive. Among them, the layer closest to the food is often the layer of hot melt adhesive, which is often dissolved by solvents (such as n-hexane, n-heptane, xylene, etc.), resulting in exceeding the standard and not complying with existing regulations. Therefore, in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J123/08C09J191/06C09J123/12
Inventor 李淑贞杨一杰陈彦合张钧诚
Owner 广州德渊精细化工有限公司
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