A preparation method for an environmentally-friendly anti-yellowing curing agent with a good adhesive force
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An environmentally friendly curing agent, anti-yellowing technology, applied in adhesive additives, non-polymer adhesive additives, coatings, etc., can solve the problems of low surface tension, high production cost, long production cycle, etc. Excellent adhesion, no need for equipment investment, good effect of yellowing and weathering resistance
Active Publication Date: 2013-08-07
SKSHU PAINT
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Abstract
Description
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Problems solved by technology
[0002] At present, in wood coatings, many of the substrates of the boards have not been well treated, and the sanding is not thorough, which leads to the delamination of the primer or topcoat, which seriously affects the wide use of the product and increases the furniture factory. Labor costs; because the treatment of free monomers after reaction is generally separated from unreacted monomers through thin film evaporator evaporation or solvent extraction in the world, but this method requires high investment in production equipment, complex processes, and long production cycles. Problems such as high production costs; silicone is an organic-inorganic hybrid material with excellent heat resistance, weather resistance, water resistance and low surface tension
Method used
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Embodiment 1
[0020] Add 90g of toluene diisocyanate into a four-necked flask with a condenser and nitrogen protection, add 250g of ethyl acetate, start stirring, add 15g of diethylene glycol, keep it at 50-55°C for 1 hour, add 100g of HDI, 30gTMP, add 10g trimethylsilanol, react at 75°C for 2h, add 0.5g trimerization catalyst after reaction, trimerize at 60°C, detect NCO content every 1h, when the total NCO content drops to 8.5%, Cool down and add 0.5g benzoyl chloride polymerization inhibitor to terminate the reaction, cool down and discharge.
Embodiment 2
[0022] Add 90g of toluene diisocyanate into a four-neck flask with a condenser and nitrogen protection, add 270g of ethyl acetate, start stirring, add 14g of butanediol, keep it at 50-55°C for 1 hour, add 120g of HDI, 33gTMP, add 8g trimethylsilanol, react at 75°C for 2h, add 0.5g trimerization catalyst after reaction, trimerize at 60°C, detect NCO content every 1h, when the total NCO content drops to 8.5%, Cool down and add 0.5g phosphoric acid polymerization inhibitor to terminate the reaction, cool down and discharge.
Embodiment 3
[0024] Add 95g of toluene diisocyanate into a four-necked flask with a condenser and nitrogen protection, add 310g of ethyl acetate, start stirring, add 23g of TMP, keep it at 50-55°C for 1 hour, add 140g of HDI and 40g of TMP after keeping it warm, add 11g trimethylsilanol, react at 75°C for 2h, add 0.5g trimerization catalyst after the reaction, trimerize at 60°C, check the NCO content every 1h, when the total NCO content drops to 8.5%, cool down and add 0.5 g phosphoric acid polymerization inhibitor to terminate the reaction, cooling and discharging.
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Abstract
The present invention relates to a preparation method for an environmentally-friendly anti-yellowing curing agent with a good adhesive force. The preparation method comprises the following steps of: step 1, adding TDI into a solvent for dissolving, and adding a low molecular weight alcohol containing 1-3 hydroxyl groups for a prepolymerization reaction, wherein the low molecular weight alcohol accounts for 20%-35% of the total amount of the alcohol; step 2, after the prepolymerization reaction, adding HDI and the remaining low molecular weight alcohol containing 1-3 hydroxyl groups, and simultaneously adding a silanol for the prepolymerization reaction, wherein the molar ratio of TDI : HDI = 0. 5-1:1, and the molar ratio of the salinol: HDI=0.05-0.2:1; and step 3, after the prepolymerization reaction, adding a trimerization catalyst, continuously detecting contents of NCO (NCO%) and free TDI (TDI%), and when the content of NCO (NCO%) reaches 8.5% and the content of a free monomer is less than 0.5%, adding a polymerization inhibitor to terminate the reaction, and cooling for material unloading. According to the method of the present invention, a trimerization method is used for reducing the content of the free monomer, the process flow is simple, no large investment in equipment is needed, the production cost is low, the product performance fully fulfills the application requirements in the paint field, and is conductive to environmental protection and health; and when the curing agent is used in coatings, the paint film has good adhesive force with the substrate, and the recoating adhesive force is more excellent, and anti-yellowing and anti-weathering performance of the paint film is better.
Description
technical field [0001] The invention discloses the field of curing agents in coatings and adhesives, and in particular relates to a preparation method of an environmentally friendly curing agent with good adhesion and yellowing resistance. Background technique [0002] At present, in wood coatings, many of the substrates of the boards have not been well treated, and the sanding is not thorough, which leads to the delamination of the primer or topcoat, which seriously affects the wide use of the product and increases the furniture factory. Labor costs; because the treatment of free monomers after reaction is generally separated from unreacted monomers through thin film evaporator evaporation or solvent extraction in the world, but this method requires high investment in production equipment, complex processes, and long production cycles. Problems such as high production costs; silicone is an organic-inorganic hybrid material with excellent heat resistance, weather resistance...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information
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