Urea-formaldehyde resin additive and preparation method thereof
A urea-formaldehyde resin and additive technology, applied in the directions of adhesive additives, polymer adhesive additives, non-polymer adhesive additives, etc., can solve problems such as easy generation of new pollution, and achieve high bonding strength and bacteria resistance. And the effect of good anti-deformation ability and wide operation practicability
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[0031] The preparation method of above-mentioned urea formaldehyde resin additive, comprises the steps:
[0032] S1. Evenly disperse the dry powder of papermaking waste in water, raise the temperature, add the cross-linking agent to mix, and heat it for a certain period of time after the second heating;
[0033] S2. Lower the temperature of the mixed solution prepared in step S1, add the first part of the catalyst and mix it evenly, and keep it warm for a certain period of time after heating up; then perform a second cooling, add the second part of the catalyst and mix it evenly, and after spray drying, the described Additives for urea-formaldehyde resins.
[0034] As a preferred embodiment, the specific process of step S1 is: uniformly disperse the dry powder of papermaking waste in water, raise the temperature to 30-70°C, add the cross-linking agent and mix well, and heat up to 70-100°C for a second time. ℃, 60-70min. The specific process of step S2 is: lower the temperatu...
Embodiment 1
[0037] A urea-formaldehyde resin additive, which is composed of 100 g of pulp residue dry powder, 5 g of urotropine, 3.7 g of formaldehyde, 1 g of hydrochloric acid, and 200 g of deionized water.
[0038] The preparation method of above-mentioned urea formaldehyde resin additive, comprises the steps:
[0039] S1. Add 100g of pulp residue dry powder and 200g of deionized water into the kettle and heat up to 70°C, add 5g of urotropine and 3.7g of formaldehyde, heat up to 90°C, and keep warm for 60min;
[0040] S2. Cool the mixed solution prepared in step S1 to 80°C, add 0.6g of hydrochloric acid, raise the temperature to 95°C, and keep it warm for 10 minutes; lower the temperature to 40°C for the second time, add 0.4g of hydrochloric acid, and spray dry to obtain the urea-formaldehyde resin additive .
Embodiment 2
[0042] A urea-formaldehyde resin additive, which is composed of 100 g of pulping waste liquor dry powder, 10 g of sodium sulfite, 3.7 g of formaldehyde, 1 g of formic acid, and 300 g of deionized water.
[0043] The preparation method of above-mentioned urea formaldehyde resin additive, comprises the steps:
[0044] S1. Add 100 g of pulping waste liquid dry powder and 300 g of deionized water into the kettle and heat up to 65°C, add 10g of sodium sulfite and 3.7g of formaldehyde, heat up to 90°C, and keep warm for 70 minutes;
[0045] S2. Cool down the mixed solution prepared in step S1 to 80°C, add 0.6g of formic acid, raise the temperature to 95°C, and keep it warm for 10 minutes; lower the temperature to 40°C for the second time, add 0.4g of formic acid, and spray dry to obtain the urea-formaldehyde resin additive .
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