Urea-formaldehyde resin adhesive containing modified starch emulsion, preparation method and application
A technology of urea-formaldehyde resin and starch milk, which is used in starch-derived adhesives, adhesives, aldehyde/ketone condensation polymer adhesives, etc. The effect of curing time, improving drying rate and improving economic efficiency of enterprises
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Example Embodiment
[0029] Example 1
[0030] 1) Preparation of modified starch emulsion:
[0031] According to the invention patent "a preparation method of modified starch adhesive for wood" (ZL201010171082.8), the obtained modified starch emulsion has a solid content of ≥35%.
[0032] 2) Preparation of aqueous polymer solution:
[0033] 10 g of polyvinyl alcohol was added to 90 g of water, the temperature was raised to 90° C., and stirred for 30 minutes to prepare the water-based polymer.
[0034] 3) Preparation of raw material veneer:
[0035] The AYOUS logs are peeled and cut into veneers of certain specifications, and the veneers are bleached or dyed and dried. The moisture content of the veneers is controlled at 8-12%, and then the veneers are repaired and sorted according to the process requirements. .
[0036] 4) Modulation of adhesive:
[0037] Put 30kg of urea-formaldehyde resin, 20kg of modified starch emulsion, 20kg of polyvinyl acetate emulsion, 9kg of water-based polymer, 0.15...
Example Embodiment
[0041] Example 2
[0042] The remaining production processes in Example 1 are not changed, only the following changes are made to the adhesive formulation:
[0043] Urea-formaldehyde resin 30kg, modified starch emulsion 20kg, polyvinyl acetate emulsion 15kg, water-based polymer 9kg, polyacrylamide 0.18kg, isocyanate prepolymer 7.5kg, organic acid solution 1.1kg, bentonite 1.5kg.
[0044]The reconstituted decorative veneer thus obtained meets the requirements of the GB / T 28999-2012 "Reconstituted decorative veneer" standard, and the formaldehyde emission is 1.0 mg / L.
Example Embodiment
[0045] Example 3
[0046] The remaining production processes in Example 1 are not changed, only the following changes are made to the adhesive formulation:
[0047] Urea-formaldehyde resin 25kg, modified starch emulsion 20kg, polyvinyl acetate emulsion 20kg, water-based polymer 9kg, polyacrylamide 0.18kg, isocyanate prepolymer 7.5kg, organic acid solution 1.1kg, flour 1kg, bentonite 1kg.
[0048] The reconstituted decorative veneer thus obtained has been inspected to meet the standard requirements of GB / T 28999-2012 "Reconstituted Decorative Veneer", and the formaldehyde emission is 0.9 mg / L.
[0049] To sum up, the starch emulsion-modified urea-formaldehyde resin adhesive provided by the present invention adopts urea-formaldehyde resin to be mixed with modified starch emulsion and polyvinyl acetate emulsion, so that the total volatile organic compounds are less, the formaldehyde emission is effectively reduced, and the formaldehyde emission is relatively low. High environmen...
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