Composite water-based cross-linking modifier as well as preparation method and application thereof
A cross-linking modifier, water-based technology, applied in adhesive types, protein adhesives, adhesive additives, etc., can solve the problems that cannot be widely used, high cost of formaldehyde-free and environmentally friendly soybean adhesives, and achieve excellent bonding performance, cost reduction effect
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specific Embodiment approach 1
[0022] Specific implementation mode one: a composite water-based cross-linking modifier in this embodiment, the composite water-based cross-linking modifier is composed of 100 parts of polyamide polyamine-epichlorohydrin resin solution and 55 parts to 830 parts in parts by mass It is prepared from melamine-urea-glyoxal co-condensation prepolymerized resin solution; the mass percentage of solid content in the composite water-based crosslinking modifier is 15% to 40%;
[0023] The melamine-urea-glyoxal co-condensation prepolymerization resin solution is prepared by mass parts from 145 parts of glyoxal solution, 30-415 parts of water, 21-40.5 parts of urea and 1-6 parts of melamine formed; the mass percentage of solids in the melamine-urea-glyoxal co-condensation prepolymerization resin solution is 15% to 45%; the aldehyde in the melamine-urea-glyoxal co-condensation prepolymerization resin solution The mass percentage of base is 1.2%-7.5%; the pH value of the melamine-urea-glyox...
specific Embodiment approach 2
[0032] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the mass percentage of described polyamide polyamine-epichlorohydrin resin solution is 5%~25%; The mass percentage of described glyoxal solution The percentage is 30% to 50%. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0033] Specific embodiment three: present embodiment a kind of preparation method of composite water-based cross-linking modifier, it is finished according to the following steps:
[0034] 1. Weigh 145 parts of glyoxal solution, 30 to 415 parts of water, 21 to 40.5 parts of urea and 1 to 6 parts of melamine in parts by mass; mix 145 parts of glyoxal solution with 30 to 415 parts of water Stir and mix, adjust the pH at room temperature, then add 21 to 40.5 parts of urea at room temperature and stirring conditions, and raise the temperature to 50°C to 80°C, and add 1 portion at a temperature of 50°C to 80°C and stirring conditions ~6 parts of melamine, then react at a temperature of 50°C to 80°C under stirring conditions until the original aldehyde content in the system decreases by more than 45% and remains stable, and finally cool down and discharge the material to obtain melamine-urea-glyoxal co-condensation Prepolymerized resin solution;
[0035] 2. Weigh 100 parts of polya...
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