Adhesive for industrial-washing-resistant bright silver reflective fabric and preparation method thereof
A technology of reflective cloth and adhesives, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problems of poor washability and achieve flexible hand feeling, excellent hydrolysis resistance, and good bonding strength Effect
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[0056] A method for preparing an adhesive for industrial washing-resistant bright silver reflective cloth, including:
[0057] Step 1. Heat a certain amount of polyester polyol and / or polyether polyol to 120°C, stir and mix uniformly, and dehydrate at the same time under reduced pressure for 2h, and then lower the temperature to 60°C;
[0058] As an example, the vacuum dehydration process requires a vacuum degree ≥ 0.1MPa;
[0059] As an example, the polyether polyol is: polytetrahydrofuran ether with a molecular weight of 1000-3000, and commercial products such as PTMEG1000, PTMEG2000, and PTMEG3000;
[0060] Further, the preparation method of the polyester polyol includes:
[0061] ①One-time esterification: Add sebacic acid, isophthalic acid, adipic acid, ethylene glycol, diethylene glycol and neopentyl glycol into the polyester reactor at one time, heat up to 210~230℃, and react 2 -4 hours, complete one esterification, the acid value of one esterification is ≤20mg KOH / g;
[0062] ②Po...
Example Embodiment
[0071] Example 1: A method for preparing an adhesive for industrial washing-resistant bright silver reflective cloth, including:
[0072] Step 1. Preparation of polyester polyol (each raw material is calculated by mass percentage): In the polyester reactor, add: 29 parts by mass of sebacic acid, 25 parts by mass of isophthalic acid, 4 parts by mass of adipic acid, 8 parts by mass Parts of ethylene glycol, 9 parts by mass of dihexanediol, 25 parts by mass of neopentyl glycol, 0.02 parts by mass of tetra-n-butyl titanate and 0.04 parts of triphenyl phosphite, fully stirred and heated to 210-230°C, After 4 hours of reaction, 11.8 parts by mass of distilled water, the acid value measured after esterification is 17.9 mg KOH / g;
[0073] After the esterification is completed, vacuumize the polyester kettle, -0.02MPa, -0.04MPa, -0.06MPa, -0.08MPa, pre-extract 1h in sequence, and control the temperature of the kettle at 225-230℃; after the pre-exhaust, perform long extraction Vacuum operat...
Example Embodiment
[0076] Embodiment 2: A method for preparing an adhesive for industrial washing-resistant bright silver reflective cloth, including:
[0077] Step 1. Preparation of polyester polyol (each raw material is calculated by mass percentage): Add 26 parts by mass of sebacic acid, 19 parts by mass of isophthalic acid, 14 parts by mass of adipic acid, and 10 parts by mass into the polyester reactor Ethylene glycol, 9 parts by mass of dihexanediol, 22 parts by mass of neopentyl glycol, 0.02 parts by mass of tetra-n-butyl titanate and 0.04 parts of triphenyl phosphite, fully stirred and heated to 210~230°C, react 4h, 13.4 parts by mass of distilled water, the acid value measured after esterification is 16.5mg KOH / g; after the esterification is completed, vacuum the polyester kettle, -0.02MPa, -0.04MPa, -0.06MPa, -0.08MPa , Pre-pump 1h successively, the temperature of the kettle is controlled at 225-230℃; After the pre-pump is completed, perform long vacuum operation, the vacuum degree reache...
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