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Non-yellowing thermoplastic polyurethane hot melt adhesive and preparation method thereof

A thermoplastic polyurethane and hot-melt adhesive technology, applied in the field of polyurethane hot-melt adhesives, can solve the problems of shortening the service life of bonding products, shortening the service life of bonding products, yellowing of polyurethane hot-melt adhesives, etc., and achieves easy operation and low cost. , the effect of improving heat resistance

Inactive Publication Date: 2010-06-30
GUANGZHOU LUSHAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the currently available polyurethane hot melt adhesives on the market use aromatic isocyanates as raw materials, and the polyurethane hot melt adhesives prepared from them tend to form quinone structures or azo compounds that develop color under long-term light conditions, resulting in yellowing of the adhesive layer. , the performance is reduced, and the service life of the bonded product is shortened
Patent USP5166300, Kenneth A.Rumon uses additives to change the anti-yellowing properties of polyurethane adhesives. Although this method can change the anti-yellowing properties of adhesives, it only prolongs the yellowing time of hot melt adhesives, and does not fundamentally To solve the problem of yellowing of polyurethane hot melt adhesive, the bonding part of the product will still have aging yellowing phenomenon under long-term light conditions, shortening the service life of the bonded product

Method used

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  • Non-yellowing thermoplastic polyurethane hot melt adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 50g of polybutylene adipate (number-average molecular weight: 2500), 30g of polyethylene glycol (number-average molecular weight: 1000), dehydrate under vacuum at 110-120°C for 3-4 hours, and determine that the water content is less than 0.05%. Yes; lower the temperature to 70-75°C, add 2g of fumed silica (10-50nm), 0.01g of dibutyltin dilaurate as a catalyst, 0.02g of stannous octoate, 0.02g of γ-aminopropyltriethoxysilane and 1 , 3.60g of 4-butanediol, after stirring evenly, add 15.13g of 1,6-hexamethylene diisocyanate, react for 5-10min, and vacuumize (the maximum vacuum degree is 0.67KPa) for 3-5min to defoam. When finished, stop stirring, release the vacuum, pour it into a preheated polytetrafluoroethylene tray and mature at 110-120°C for 4-6 hours, and you can get a non-yellowing thermoplastic polyurethane hot melt adhesive.

Embodiment 2

[0029] Take 80g of polybutylene adipate (number-average molecular weight: 2000) and 10g of polycaprolactone (number-average molecular weight: 2000), and vacuum dehydrate at 110-120°C for 3-4 hours, and determine that the water content is less than 0.05%. Yes; cool down to 70-75°C, add 2g of fumed silica (10-50nm), 2g of nano-titanium dioxide, 0.02g of dibutyltin dilaurate as catalyst, 0.04g of γ-aminopropyltriethoxysilane, 1,4 -Butanediol 3.65g, stir to make it completely and uniformly mixed with polyol, add 9.5g of isophorone diisocyanate, 11.2g of dicyclohexylmethane diisocyanate to react for 5-10min, and vacuumize (maximum vacuum degree is 0.67KPa ) defoaming for 3-5 minutes, when the air bubbles are basically exhausted, stop stirring, release the vacuum, pour it into a preheated polytetrafluoroethylene tray and mature at 110-120°C for 4-6 hours, and you can get high-hardness non-yellowing thermoplastic Polyurethane hot melt adhesive.

Embodiment 3

[0031] Take 50.0g of polytrimethylene adipate (number average molecular weight is 3000), 10.0g of polycaprolactone (number average molecular weight of 2000), 30.0g of polytetrahydrofuran diol (number average molecular weight of 2000), at 110~120℃ Under vacuum dehydration for 3-4 hours, it is enough to measure the water content to be less than 0.05%; lower the temperature to 70-75°C, add 2.5g of fumed white carbon black (10-50nm), 2.0g of nano-titanium dioxide, and 0.02g of catalyst dibutyltin dilaurate, 0.06g of γ-aminopropyltriethoxysilane, 3.3g of methylpropanediol, stir to make it completely and evenly mixed with polyol, add 11.5g of dicyclohexylmethane diisocyanate, 4.9g of 1,6-hexamethylene diisocyanate to react 5 ~10min, and vacuumize (the maximum vacuum degree is 0.67KPa) for degassing for 3~5min. When the bubbles are almost exhausted, stop stirring, release the vacuum, pour into the preheated polytetrafluoroethylene tray and mature at 110~120℃ After 4-6 hours, a transp...

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Abstract

The invention discloses non-yellowing thermoplastic polyurethane hot melt adhesive which is calculated by weight percentage; the prescription comprises the following components: 40 to 55 percent of polyester polyol, 30 to 45 percent of polyether polyol, 1 to 4 percent of chain extendor, 12 to 24 percent of aliphatic isocyanates, 0.2 to 2 percent of coupling agent, 0.5 to 4 percent of inorganic nano-sized powder, and 0.02 to 0.05 percent of catalyst which are prepared through bulk polymerization. The invention adopts aliphatic isocyanates as the raw material, thereby fundamentally solving the problem that the polyurethane hot melt adhesive on sale yellows and is aged in a short time; the prepared polyurethane hot melt adhesive does not yellow in 504 hours under the irradiation of an xenon lamp, is particularly applicable in the bonding of products with appearance in light color or in white or with quite high grade, does not contain organic solvent, has no harm to the environment and the human body when in use and belongs to environment-friendly hot melt adhesive; and in addition, the preparation method has the advantages of little equipment investment, simple process, easy operation, stable product quality and the like.

Description

technical field [0001] The invention belongs to the bonding field, in particular to a polyurethane hot melt adhesive. Background technique [0002] Thermoplastic polyurethane hot-melt adhesives react linear or slightly branched polymer diols, low molecular weight chain extenders and isocyanates to form chain-like polymer compound urethanes, that is, polyurethanes. When in use, it is heated to a certain temperature to be melted and coated on the surface of the substrate, and then solidified after cooling. The solidification process mainly uses the hydrogen bond in the composition to cause physical crosslinking, and has excellent toughness and bonding strength. Thermoplastic polyurethane hot melt adhesive loses hydrogen bond after being heated to a certain temperature and becomes a viscous liquid, and returns to its original physical properties after cooling. Therefore, it can be repeatedly heated and cooled to solidify by using this characteristic. This hot melt adhesive has ...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J175/06
Inventor 靳东杰徐文超唐舫成汪加胜
Owner GUANGZHOU LUSHAN NEW MATERIALS
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