Preparation method of high-performance low-viscosity glue for low-viscosity PET (polyethylene terephthalate) protective film
A protective film, high-performance technology, used in adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problems of unstable viscosity, residual glue, high temperature resistance, etc., to reduce the degree of crosslinking , reducing activity, good effect of high temperature resistance
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[0025] The chain extender plays an important role in the preparation of high-performance low-viscosity adhesives. The chain extender is acidic, and the acidic substance can inhibit the formation reaction of biuret, thereby inhibiting the cross-linking reaction, thereby reducing the degree of cross-linking and reducing the viscosity.
[0026] As a preferred solution, the salt-forming agent is preferably one or more of triethylamine, NaOH, KOH and ammonia water. The organic solvent is preferably one or more of acetone, butanone, N-methylpyrrolidone and N,N-dimethylformamide.
[0027] As a preferred version, the catalyst is prepared according to the following method: stir and heat methylimidazole and ethyl bromide with a molar ratio of 1:1 under the condition of 450-750r / min and heat up to 50-80°C for 6-18h, then use The catalyst was obtained by washing with ethyl acetate several times.
[0028] The catalyst plays a role in promoting the preparation of high-performance low-visco...
Embodiment 1
[0037] The low-viscosity PET protective film for foam materials of the present invention consists of a 50 μm PET base layer, a 5 μm low-viscosity intermediate layer, and a 20 μm protective layer.
[0038] The low-viscosity intermediate layer is formed by high-performance low-viscosity adhesive, which consists of 20 parts by weight of macromolecular polyol polyether polyol, 3 parts by weight of isocyanate toluene diisocyanate, 2 parts by weight of chain extender, and 0.5 parts by weight of salt Agent triethylamine, 4 parts by weight of catalyst, 10 parts by weight of organic solvent acetone and 100 parts by weight of deionized water, the specific preparation method is as follows:
[0039] (1) Vacuum dehydrate the macromolecular polyol at 100°C for 5 hours, then cool to 60°C;
[0040] (2) Add isocyanate, organic solvent and catalyst, and react at a constant temperature for 6 hours under the condition of 500r / min;
[0041] (3) Then add a chain extender for chain extension reaction...
Embodiment 2
[0049] The low-viscosity PET protective film for foam materials of the present invention consists of a 100 μm PET base layer, a 10 μm low-viscosity intermediate layer, and a 50 μm protective layer.
[0050] The low-viscosity middle layer is formed by high-performance low-viscosity adhesive, which is composed of 80 parts by weight of macromolecular polyol polyester polyol, 5 parts by weight of isocyanate 4,4'-diphenylmethane diisocyanate, 3 parts by weight of expanded Chain agent, 0.5-2 parts by weight of salt-forming agent ammonia water, 4-10 parts by weight of catalyst, 10 parts by weight of organic solvent N-methylpyrrolidone and 100 parts by weight of deionized water, the specific preparation method is as follows:
[0051] (1) Vacuum dehydrate the macromolecular polyol at 120°C for 2 hours, then cool to 80°C;
[0052] (2) Add isocyanate, organic solvent and catalyst, and react at a constant temperature for 2 hours under the condition of 1500r / min;
[0053] (3) Then add a c...
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