Food-additive-resistant flexible packaging compound binder and preparation method thereof

Abstract

The invention discloses a food-additive-resistant flexible packaging compound binder and a preparation method thereof. The binder comprises a main agent and a curing agent, wherein the main agent is an ethyl acetate solution comprising polyamide-polyester polyol, bisphenol A type epoxy resin and a silane coupling agent, and the polyamide-polyester polyol is synthesized by isophthalic acid, terephthalic acid, adipic acid, dimer acid, 4-aminomethyl-1,8-diamine, neopentyl glycol, 1,6-hexanediol and ethylene glycol; and the curing agent is an ethyl acetate solution which contains an isocyanate prepolymer and is synthesized by isocyanate, low-molecular-weight polyol and ethyl acetate. The binder, which is prepared by mixing the main agent and a curing agent at a ratio, can be directly used for compounding high-permeability food additive packaging materials. A PET / AL / RCPP composite material prepared from an aged product has the advantages of excellent peeling strength, heat resistance, food additive resistance and the like.

Description

technical field

[0001] The invention relates to a chemical adhesive, in particular to a food additive-resistant flexible packaging composite adhesive and a preparation method thereof. Background technique

[0002] Food flexible packaging is an important part of food products. It can not only protect food, but also prevent the damage of biological, chemical, physical and other external factors during the circulation of food from the factory to consumers. It can also maintain the stable quality of the food itself. function. Food flexible packaging is generally composed of multi-layer films with adhesives. Many foods on the market are added with various food additives such as salt, vinegar, essence, edible oil, ethyl maltol, chili oil, and maltodextrin. , These food additives are often highly permeable, and can easily penetrate the inner layer of the packaging, causing delamination. Therefore, this type of food flexible packaging is generally a composite structure containing h...

Examples

preparation example Construction

[0040] The preparation steps of this polyamide-polyester polyol are specifically:

[0041] Amidation reaction: Add dimer acid and 4-aminomethyl-1,8-octanediamine into the reaction kettle, raise the temperature to 210-230°C, and react for 2-4 hours to complete the amidation reaction and obtain the amidation product .

[0042] Esterification reaction: adding amidation products, isophthalic acid, terephthalic acid, adipic acid, neopentyl glycol, 1,6-hexanediol, ethylene glycol, catalysts and antioxidants to polyester synthesis In the kettle, heat up to 210-230°C, react for 6-10 hours, complete the esterification reaction, the water output accounts for 11-13% of the total weight of the raw materials, and the acid value of the esterification product is ≤15mgKOH / g;

[0043] Polycondensation reaction: After the esterification reaction is completed, vacuumize the inside of the polyester synthesis kettle, and pre-pump for 30 minutes at -0.02MPa, -0.04MPa, -0.06MPa, -0.08MPa respective...

Embodiment 1

[0064] This embodiment provides a food additive-resistant flexible packaging composite adhesive adhesive, which is prepared according to the following steps:

[0065] Preparation of the main ingredient: Add 3 parts by mass of dimer acid and 0.4 parts by mass of 4-aminomethyl-1,8-octanediamine into a polyester reactor, heat up to 210-230°C, and react for 3 hours to complete amidation reaction. Cool down to 140°C, add 34 parts by mass of isophthalic acid, 8.5 parts by mass of terephthalic acid, 15 parts by mass of adipic acid, 15 parts by mass of neopentyl glycol, 12.8 parts by mass of 1,6-hexanediol, ethylene glycol 11.2 parts by mass of alcohol, 0.02 part by mass of antimony trioxide and 0.04 part by mass of triphenyl phosphite, fully stirred and evenly heated to 210-230°C, reacted for 6 hours, 13 parts by mass of water slipped out, measured after the esterification reaction The acid value is 12mgKOH / g; after the esterification reaction is completed, vacuumize the inside of t...

Embodiment 2

[0070] This embodiment provides a composite adhesive for flexible packaging resistant to food additives, which is prepared according to the following steps:

[0071]Preparation of the main ingredient: Add 6 parts by mass of dimer acid and 0.2 parts by mass of 4-aminomethyl-1,8-octanediamine into a polyester reactor, heat up to 210-230°C, and react for 2 hours to complete amidation reaction. Cool down to 140°C, add 26.3 parts by mass of isophthalic acid, 4.4 parts by mass of terephthalic acid, 27 parts by mass of adipic acid, 11 parts by mass of neopentyl glycol, 8.7 parts by mass of 1,6-hexanediol, ethylene glycol 16.4 parts by mass of alcohol, 0.02 parts by mass of tetra-n-butyl titanate and 0.04 parts by mass of triphenyl phosphite, stir well, heat up to 210-230°C, react for 6 hours, 13.3 parts by mass of water slip out, after the esterification reaction The measured acid value is 14mgKOH / g; after the esterification reaction is completed, vacuumize the inside of the polyest...

technical field

[0001] The invention relates to a chemical adhesive, in particular to a food additive-resistant flexible packaging composite adhesive and a preparation method thereof. Background technique

[0002] Food flexible packaging is an important part of food products. It can not only protect food, but also prevent the damage of biological, chemical, physical and other external factors during the circulation of food from the factory to consumers. It can also maintain the stable quality of the food itself. function. Food flexible packaging is generally composed of multi-layer films with adhesives. Many foods on the market are added with various food additives such as salt, vinegar, essence, edible oil, ethyl maltol, chili oil, and maltodextrin. , These food additives are often highly permeable, and can easily penetrate the inner layer of the packaging, causing delamination. Therefore, this type of food flexible packaging is generally a composite structure containing h...

Examples

preparation example Construction

[0040] The preparation steps of this polyamide-polyester polyol are specifically:

[0041] Amidation reaction: Add dimer acid and 4-aminomethyl-1,8-octanediamine into the reaction kettle, raise the temperature to 210-230°C, and react for 2-4 hours to complete the amidation reaction and obtain the amidation product .

[0042] Esterification reaction: adding amidation products, isophthalic acid, terephthalic acid, adipic acid, neopentyl glycol, 1,6-hexanediol, ethylene glycol, catalysts and antioxidants to polyester synthesis In the kettle, heat up to 210-230°C, react for 6-10 hours, complete the esterification reaction, the water output accounts for 11-13% of the total weight of the raw materials, and the acid value of the esterification product is ≤15mgKOH / g;

[0043] Polycondensation reaction: After the esterification reaction is completed, vacuumize the inside of the polyester synthesis kettle, and pre-pump for 30 minutes at -0.02MPa, -0.04MPa, -0.06MPa, -0.08MPa respective...

Embodiment 1

[0064] This embodiment provides a food additive-resistant flexible packaging composite adhesive adhesive, which is prepared according to the following steps:

[0065] Preparation of the main ingredient: Add 3 parts by mass of dimer acid and 0.4 parts by mass of 4-aminomethyl-1,8-octanediamine into a polyester reactor, heat up to 210-230°C, and react for 3 hours to complete amidation reaction. Cool down to 140°C, add 34 parts by mass of isophthalic acid, 8.5 parts by mass of terephthalic acid, 15 parts by mass of adipic acid, 15 parts by mass of neopentyl glycol, 12.8 parts by mass of 1,6-hexanediol, ethylene glycol 11.2 parts by mass of alcohol, 0.02 part by mass of antimony trioxide and 0.04 part by mass of triphenyl phosphite, fully stirred and evenly heated to 210-230°C, reacted for 6 hours, 13 parts by mass of water slipped out, measured after the esterification reaction The acid value is 12mgKOH / g; after the esterification reaction is completed, vacuumize the inside of t...

Embodiment 2

[0070] This embodiment provides a composite adhesive for flexible packaging resistant to food additives, which is prepared according to the following steps:

[0071]Preparation of the main ingredient: Add 6 parts by mass of dimer acid and 0.2 parts by mass of 4-aminomethyl-1,8-octanediamine into a polyester reactor, heat up to 210-230°C, and react for 2 hours to complete amidation reaction. Cool down to 140°C, add 26.3 parts by mass of isophthalic acid, 4.4 parts by mass of terephthalic acid, 27 parts by mass of adipic acid, 11 parts by mass of neopentyl glycol, 8.7 parts by mass of 1,6-hexanediol, ethylene glycol 16.4 parts by mass of alcohol, 0.02 parts by mass of tetra-n-butyl titanate and 0.04 parts by mass of triphenyl phosphite, stir well, heat up to 210-230°C, react for 6 hours, 13.3 parts by mass of water slip out, after the esterification reaction The measured acid value is 14mgKOH / g; after the esterification reaction is completed, vacuumize the inside of the polyest...