Solvent-free polyurethane resin for synthetic leather and its preparation method and application in water-based/solvent-free polyurethane synthetic leather
A solvent-free polyurethane and synthetic leather technology, applied in textiles and papermaking, can solve the problems of low water-based/solvent-free peel strength, achieve the effects of enhancing production operation tolerance, increasing initial peel strength, and improving production efficiency
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[0033] (3) Preparation of water-based / solvent-free synthetic leather:
[0034] Coat the KTC716 carboxylic acid water-based resin of Hefei Water-based Ketian Material Co., Ltd. on the release paper, and dry it at 130°C for 2 minutes to obtain the surface layer; cast component A and component B at a low pressure according to a certain mass ratio Fully mix in the machine to obtain solvent-free polyurethane resin, pour and coat on the water-based surface layer, then enter the 110°C oven for pre-reaction for 60 seconds, after the pre-reaction is completed, attach the base fabric, and then continue to react at 100-150°C for 7 minutes , to make it cross-linked and solidified; after curing and forming, the release paper is peeled off and rolled up to obtain high-stripping water-based / solvent-free synthetic leather.
[0035] Test the peel strength (i.e. the initial peel strength), the prepared water-based / solvent-free synthetic leather is aged at 70°C for 24 hours, and test the peel st...
Embodiment 1
[0046] (1) Preparation of component A:
[0047] Dehydrate DP-4000 and PE-1320 at 90-110°C and -0.08MPa~-0.1MPa for 3-5h for later use; add 20 parts of DP-4000 and 80 parts of PE-1320 after dehydration into the reactor, Adjust and keep the temperature at 40-60°C, then add 1 part of 1,4-butanediol, 5 parts of trimethylolpropane, 0.1 part of water, 0.02 part of BiCAT 8124, 0.1 part of DC-193, and stir for 4-6 hours , to obtain component A.
[0048] (2) Preparation of component B:
[0049] Put 30 parts of MDI-100 into the reaction kettle and stir to mix evenly, then add 5 parts of dehydrated DP-4000, 40 parts of PE-1320, 0.1 part of dimethylol propionic acid, heat up to 70-80°C, and stir to react 4-6h, component B is obtained.
[0050] (3) Preparation of water-based / solvent-free synthetic leather:
[0051] Coat the KTC716 carboxylic acid water-based resin of Hefei Water-based Ketian Material Co., Ltd. on the release paper, and dry it at 130°C for 2 minutes to form a surface la...
Embodiment 2
[0054] (1) Preparation of component A:
[0055] Dehydrate DP-4000 and PE-1320 at 90-110°C and -0.08MPa~-0.1MPa for 3-5 hours for later use; add 40 parts of DP-4000 and 60 parts of PE-1320 after dehydration into the reactor, Adjust and keep the temperature at 40-60°C, then add 8 parts of 1,4-butanediol, 2 parts of trimethylolpropane, 0.5 parts of water, 0.4 parts of BiCAT 8124, 0.8 parts of DC-193, and stir for 4-6 hours , to obtain component A.
[0056] (2) Preparation of component B:
[0057] Put 40 parts of MDI-100 into the reaction kettle and stir to mix evenly, then add 20 parts of dehydrated DP-4000, 20 parts of PE-1320, 2 parts of dimethylol propionic acid, heat up to 70-80°C, and stir to react 4-6h, component B is obtained.
[0058] (3) Preparation of water-based / solvent-free synthetic leather:
[0059] Coat the KTC716 carboxylic acid water-based resin of Hefei Water-based Ketian Material Co., Ltd. on the release paper, and dry it at 130°C for 2 minutes to form a su...
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