Reactive polyurethane hot melt adhesive for low-temperature coating and preparation method thereof

A polyurethane hot-melt adhesive, reactive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low temperature resistance, shortened positioning time, and improved initial adhesion and adhesion. problem, to achieve good post-adhesion, good bonding effect, and good fluidity

Active Publication Date: 2020-11-24
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing reactive polyurethane hot melt adhesives also have problems such as high melting temperature, high melt viscosity, increased initial tack and adhesion, and shortened positioning time.
[0003] In the field of woodworking cladding applications, some membrane materials used are thin and not resistant to high temperatures. If the adhesive used for lamination has high melt temperature, high viscosity, and poor fluidity, lamination will be difficult, and even film deformation and bulging will occur. And other issues

Method used

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  • Reactive polyurethane hot melt adhesive for low-temperature coating and preparation method thereof
  • Reactive polyurethane hot melt adhesive for low-temperature coating and preparation method thereof
  • Reactive polyurethane hot melt adhesive for low-temperature coating and preparation method thereof

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preparation example Construction

[0037] Further, the preparation method of the reactive polyurethane hot melt adhesive for low temperature coating may comprise the following steps:

[0038] Step 1. Weigh isocyanate, aliphatic polyester diol, polyether diol, aromatic polyester diol, antioxidant, stabilizer, Catalyst and adhesion promoter.

[0039] Step 2. Add the aliphatic polyester diol, polyether diol, aromatic polyester diol, antioxidant and stabilizer into the reaction kettle at a temperature of 100-140°C and a pressure of Keep it between -0.085~-0.095MPa, stir and dehydrate for 1~4h.

[0040] Step 3. Stop heating, and when the temperature in the reactor drops to 90°C-100°C, add the isocyanate, stir and react at 90°C-100°C for 1 hour, and keep the vacuum at -0.06MPa-0.095MPa.

[0041] Step 4. Add the adhesion promoter and catalyst into the reaction kettle, stir and react at 90° C. to 100° C. for 30 to 50 minutes, and maintain a vacuum degree of -0.08 MPa to -0.095 MPa.

[0042] Step 5. Turn off the stir...

Embodiment 1

[0049] A kind of reactive polyurethane hot-melt adhesive for low-temperature coating, its preparation method may comprise the following steps:

[0050] Step 1. Weigh 12kg of diphenylmethane-4,4-diisocyanate, 20kg of polyadipate-neopentyl glycol ester diol, 5kg of polyadipate-1,6-hexanediol ester diol, polyether diol 20kg of polyalcohol, 9kg of polyphthalic anhydride diethylene glycol ester diol, 10100.05kg of antioxidant, 0.01kg of phosphoric acid, 0.05kg of dibutyltin dilaurate, 0.5kg of silane coupling agent KH-550. The number average molecular weight of the polyether diol used in the embodiment of the present invention is 2000, the number average molecular weight of polyadipate-neopentyl glycol ester diol is 2000, the polyphthalic anhydride diethylene glycol ester diol The number average molecular weight is 1000, and the number average molecular weight of the polyadipate-1,6-hexanediol ester diol is 2000.

[0051] Step 2, the polyadipate-neopentyl glycol ester diol, polyad...

Embodiment 2

[0056] A kind of reactive polyurethane hot-melt adhesive for low-temperature coating, its preparation method may comprise the following steps:

[0057] Step 1. Weigh 16kg of diphenylmethane-4,4-diisocyanate, 8kg of polyadipate-diethylene glycol-neopentyl glycol ester diol, and 5kg of polyadipate-1,4-butylene glycol ester diol , polyether diol 30kg, polyadipic acid-phthalic acid-diethylene glycol-ethylene glycol ester diol 5kg, antioxidant 1035 0.05kg, mixture of phosphoric acid and benzoic acid 0.01kg, dimorpholine triethyl Base ether 0.1kg, silane coupling agent A-172 0.5kg. The number average molecular weight of the polyether glycol that the embodiment of the present invention uses is 1000, polyadipate-diethylene glycol-neopentyl glycol ester diol (the mol ratio of diethylene glycol and neopentyl glycol is 1:2 ) number average molecular weight is 3500, the number average molecular weight of polyadipate-1,4-butylene glycol ester diol is 3000, the number average molecular wei...

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Abstract

The invention discloses a reactive polyurethane hot melt adhesive for low-temperature coating and a preparation method of the reactive polyurethane hot melt adhesive. The reactive polyurethane hot melt adhesive for low-temperature coating is prepared from the following raw material in parts by weight: 10-35 parts of isocyanate, 10-70 parts of aliphatic polyester diol, 20-50 parts of polyether diol, 5-20 parts of aromatic polyester diol, 0.05-0.5 part of antioxidant, 0.01-0.1 part of stabilizer, 0.05-0.5 part of catalyst and 0.1-5 parts of adhesion promoter. The adhesive provided by the invention has good fluidity and low viscosity at low temperature, and ensures later adhesive strength.

Description

technical field [0001] The invention relates to the field of reactive polyurethane hot-melt adhesives, in particular to a reactive polyurethane hot-melt adhesive for coating at low temperature (the low temperature refers to 80-90° C.) and a preparation method thereof. Background technique [0002] Reactive polyurethane hot melt adhesives, also known as moisture curing hot melt adhesives, are polyurethane hot melt adhesives containing isocyanate groups. When sizing, the reactive polyurethane hot melt adhesive is heated and melted into a fluid and coated on the adherend. After the adherend is pasted, the adhesive layer produces initial adhesion due to cooling and solidification; the active isocyanate group in the adhesive layer It reacts with moisture in the air, moisture attached to the surface of the adherend, and active hydrogen groups to produce chemical crosslinking and curing, which significantly improves the adhesion, temperature resistance and other properties. Reacti...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09J11/06C08G18/42C08G18/48
CPCC09J175/04C09J11/06C08G18/4018C08G18/4202C08G18/4238C08G18/425C08G18/48C08K5/1345C08K5/544C08K5/375C08K5/5425C08K5/5435
Inventor 易晨凤罗善国
Owner BEIJING COMENS NEW MATERIALS
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