Adhesive for solvent-free two-component polyurethane composite film and preparation method thereof
A two-component polyurethane and adhesive technology, which is applied in the field of polyurethane adhesive preparation, can solve the problems of low strength and inability to use, and achieve high peel strength and environmental friendliness
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[0027] The embodiment of the present invention also provides a method for preparing an adhesive for a solvent-free two-component polyurethane composite film, which is used to prepare the above adhesive, including:
[0028] Synthesize the component A which is terminated by isocyanate and the component B which is terminated by hydroxyl, and the adhesive for the solvent-free two-component polyurethane composite film is composed of the synthesized components A and B. In the adhesive, A and B are The functional group molar ratio of the two components is 1.2-2.0:1; among them,
[0029] Synthesis of isocyanate-terminated A-components is as follows:
[0030] Mix the polyisocyanate and the first component evenly, add phosphoric acid, keep it warm at 50-60°C for 2-3 hours, then raise the temperature to 80-90°C and keep it warm for 3-4 hours. The product is A component blocked by isocyanate; Wherein, the first component adopts at least one in polyether polyol, polyester polyol, castor o...
Embodiment 1
[0046] This embodiment provides a solvent-free two-component polyurethane composite film adhesive, its preparation method is as follows, including:
[0047] Synthesize component A terminated by isocyanate and component B terminated by hydroxyl, wherein,
[0048] Synthesis of isocyanate-terminated A-components is as follows:
[0049] Mix 100 parts by weight of 4.4-diphenylmethane diisocyanate with 80 parts by weight of polyoxypropylene diol with a molecular weight of 1000, 50 parts by weight of castor oil and 0.01 part by weight of phosphoric acid. Keep warm for 2 hours, then raise the temperature to 80-90°C and react for 3-4 hours. After detecting the NCO mass percentage, add a certain amount of carbodiimide-modified 2,4-xylene according to the detected NCO mass percentage. Methane diisocyanate, continue to stir for one hour, and the NCO mass percentage is 13% to 15%, which is qualified, and the material is discharged after passing, and the synthesized product is the isocyana...
Embodiment 2
[0054] This embodiment provides a solvent-free two-component polyurethane composite film adhesive, its preparation method is as follows, including:
[0055] Synthesize component A terminated by isocyanate and component B terminated by hydroxyl, wherein,
[0056] Synthesis of isocyanate-terminated A-components is as follows:
[0057] Mix 100 parts by weight of liquefied MDI with 80 parts by weight of polyoxypropylene diol with a molecular weight of 1000, 40 parts by weight of polyether triol with a molecular weight of 700, and 0.015 parts by weight of phosphoric acid. Keep warm for 2 hours, then raise the temperature to 80-90°C and react for 3-4 hours. After the NCO content is qualified, add a certain amount of carbodiimide-modified 2,4-xylenemethane diisocyanate according to the detected NCO content, and continue Stir for one hour, check that the NCO content is 13%-15%, then it is qualified, and the material is discharged after passing the test, and the synthesized product is...
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Abstract
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