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Polyurethane hot melt adhesive film and preparation method thereof

A technology of polyurethane hot melt adhesive and diisocyanate, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, film/sheet adhesive, etc., which can solve the problem of reducing bonding strength, affecting bonding effect, and low solid content To achieve the effect of ensuring the bonding effect, reducing the energy consumption of sizing, and high bonding strength

Pending Publication Date: 2022-06-03
珠海科技学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Different types of environmentally friendly adhesives have their own advantages and disadvantages: water-based polyurethane uses water as a solvent and has no organic volatile emissions, but has disadvantages such as low solid content and poor bonding strength; solvent-free reactive polyurethane has high viscosity due to its moisture curing characteristics. Bonding strength, high temperature resistance and water resistance, but because no solvent is used, the viscosity of the adhesive is high and it is difficult to apply glue
Chinese patent CN108456504A invented a one-step method for preparing polyurethane powder hot melt adhesive technology, which got rid of the traditional secondary processing methods such as melt extrusion, crushing and grinding, but the sizing amount of powder hot melt adhesive and the It is difficult to control the uniformity of distribution on the bonding surface, which reduces the bonding strength and affects the bonding effect

Method used

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  • Polyurethane hot melt adhesive film and preparation method thereof

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preparation example Construction

[0029] The present invention also provides the preparation method of the polyurethane hot-melt adhesive film described in the above scheme, comprising the following steps:

[0030] (1) Mix polyol, diisocyanate and catalyst to carry out the first reaction, then add the first chain extender to carry out the second reaction, then add the second chain extender to carry out the third reaction, and then add the crosslinking agent to carry out the fourth reaction , and finally add a neutralizing agent to obtain a polyurethane prepolymer;

[0031] (2) After coating the polyurethane prepolymer on the film-forming substrate, drying and peeling are performed in sequence to obtain a polyurethane hot-melt adhesive film.

[0032]In the present invention, the polyol, diisocyanate and catalyst are mixed to carry out the first reaction, then the first chain extender is added to carry out the second reaction, then the second chain extender is added to carry out the third reaction, and the cross...

Embodiment 1

[0036] (1) Put 60 g of polyethylene adipate diol (PDA, number average molecular weight 3000) and 15 g of polycarbonate diol (PCDL, number average molecular weight 3000) at 105°C for vacuum drying Vacuum dewatering in the box for 6h; put the dewatered polyol into the reaction vessel, then add 16g isophorone diisocyanate (IPDI), 3.3g hexamethylene diisocyanate (HDI) and 0.1g dilaurin in sequence Dibutyltin acid catalyst, set the temperature of the water bath to 75°C, the speed of rotation is 400r / min, and react for 2h; then add 4g of 1,4-butanediol (BDO) and react for 1h;

[0037] (2) 1 g of dimethylolpropionic acid (DMPA) was dissolved in N-methylpyrrolidone of equal quality, added to the reaction vessel, and the reaction was kept under stirring for 4h, during which the viscosity was adjusted to 8000~15000mPa·s with acetone;

[0038] (3) reduce the temperature of the reaction vessel to 45°C, add 0.1 g of triethylamine to the reaction vessel, keep stirring for 1 hour, and adjust...

Embodiment 2

[0041] (1) Put 75g of poly-1,4-butanediol adipate diol (PBA, number average molecular weight 3000) in a vacuum drying box at 105°C to remove water in vacuum for 6 hours, and remove the polyol after water removal. Put it into the reaction vessel, then add 20g isophorone diisocyanate (IPDI) and 0.1g dibutyltin dilaurate catalyst in turn, set the water bath temperature to 75°C, the rotating speed to 450r / min, and react for 1h; then add 3.3g of 1,4-Butanediol (BDO), reacted for 1h;

[0042] (2) 1 g of dimethylolpropionic acid (DMPA) was dissolved in N-methylpyrrolidone of equal quality, added to the reaction vessel, and the reaction was kept under stirring for 2h, during which the viscosity was adjusted to 8000~15000 mPa·s with acetone;

[0043] (3) 0.75g of trimethylolpropane (TMP) was added to the reaction vessel, kept stirring for 2h, during which the viscosity was adjusted to 8000~15000mPa·s with acetone;

[0044] (4) reduce the temperature of the reaction vessel to 42°C, add...

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Abstract

The invention belongs to the technical field of adhesives, and particularly relates to a polyurethane hot melt adhesive film and a preparation method thereof. The polyurethane hot melt adhesive film provided by the invention is prepared from the following raw materials in percentage by weight: 73 to 80 percent of polyol, 15 to 20 percent of diisocyanate, 0.1 to 0.2 percent of catalyst, 1 to 4 percent of first chain extender, 1 to 2 percent of second chain extender, 0 to 3 percent of cross-linking agent and 0.1 to 0.2 percent of neutralizer, the first chain extender comprises 1, 4-butanediol; the second chain extender comprises dimethylolpropionic acid. The data of the embodiment shows that the bonding strength of the polyurethane hot melt adhesive film provided by the invention can reach 76.54-114.53 N / cm, the initial melting point is 45-48 DEG C, the total melting point is 49-50 DEG C, and the water absorption rate is 1.00-4.00% after the polyurethane hot melt adhesive film is soaked in water for one day. Therefore, the polyurethane hot melt adhesive film provided by the invention is white and semitransparent, not only is high in bonding strength, but also is low in melting point and low in water absorption rate, and can realize single-component sizing.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and particularly relates to a polyurethane hot-melt adhesive film and a preparation method thereof. Background technique [0002] With the country's emphasis on environmental protection and the continuous strengthening of environmental protection efforts, traditional solvent-based polyurethane adhesives have gradually withdrawn from the market, and environmentally friendly adhesives have become an important direction for future development. Common environmentally friendly polyurethane adhesives include water-based polyurethane, solvent-free reactive polyurethane, and polyurethane hot-melt adhesives. [0003] Different types of environmentally friendly adhesives have their own advantages and disadvantages: water-based polyurethane uses water as a solvent and has no organic volatile emissions, but has disadvantages such as low solid content and poor bonding strength; solvent-free reactive polyure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J7/30C08G18/66C08G18/42C08G18/44C08G18/32C08G18/34
CPCC09J175/06C09J7/30C08G18/6659C08G18/425C08G18/4238C08G18/44C08G18/3206C08G18/348C08J2475/00Y02E10/50
Inventor 任秀娥范晨阳涂嘉怡邓蓓曦首云琦廖泽鹏
Owner 珠海科技学院
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