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Polyether type moisture-curable polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive, moisture curing technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of easy quality fluctuation, long dehydration time, complex production process, etc. Molecular weight and distribution stability, good initial and final viscosity, excellent mechanical properties

Pending Publication Date: 2021-03-26
ZHEJIANG JOYA POLYMER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, PUR manufacturers all adopt the production process of adding polyol first and then isocyanate, which requires vacuum dehydration of polyol before production, that is, firstly mix the polyol components and perform high-temperature dehydration treatment, and then add isocyanate after cooling down. The synthesis reaction is carried out at low temperature. This kind of production process is relatively complicated, and the production efficiency is difficult to improve.
The existing polyol vacuum dehydration process takes a long time for dehydration, usually at least 2 hours, and the temperature is high, which will have some impact on small molecules during the dehydration process, and a part of the small molecules lost may cause the formulation to be unstable, which will also cause customers Bond quality is inconsistent when in use
The overall process is complicated, the production time is long, the quality is easy to fluctuate, and there are many customer complaints, which are the main problems faced by PUR production enterprises at present
[0004] At present, hot melt adhesive products on the market are mainly polyester or polyether-polyester mixed products. The reason is that the polyester type has good initial adhesion, fast crystallization and good setting, but it is difficult to feed and has poor hydrolysis resistance.

Method used

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  • Polyether type moisture-curable polyurethane hot melt adhesive and preparation method thereof
  • Polyether type moisture-curable polyurethane hot melt adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Under a nitrogen atmosphere, add MDI-100 into the reactor, start stirring, control the reaction temperature at 65°C, add a polymerization inhibitor, after stirring evenly, control the temperature of the reactor at 85°C, and slowly add polyether, catalyst, and disinfectant in sequence. The foaming agent is reacted, and after 120 minutes, the defoaming treatment is carried out, and the reaction is completed after 60 minutes, and the NCO content is tested to meet the design requirements, and the material is discharged.

Embodiment 2

[0056] Under a nitrogen atmosphere, add MDI-50 to the reactor, start stirring, control the reaction temperature to 68°C, add a polymerization inhibitor, stir well, then slowly add polyether, catalyst, and defoamer to react, control the reactor The temperature is 86°C, after 120 minutes, defoaming treatment is carried out, and the reaction is completed after 60 minutes, and the NCO content is tested to meet the design requirements, and the material is discharged.

Embodiment 3

[0058] Under a nitrogen atmosphere, add MDI-100 to the reactor, start stirring, control the reaction temperature to 70°C, add a polymerization inhibitor, stir well, then slowly add polyether, catalyst, and defoamer to react, control the reactor The temperature is 90°C, defoaming treatment is carried out after 120 minutes, and the reaction is completed after 60 minutes, and the NCO content is tested to meet the design requirements, and the material is discharged.

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Abstract

The invention discloses a polyether type moisture-curable polyurethane hot melt adhesive and a preparation method thereof. A process of firstly adding isocyanate and then adding polyether polyol is adopted, a polyol material with branching degree is utilized to increase the tolerance of the formula to moisture and reduce the vacuumizing link so that the production cost is greatly reduced, the production efficiency is improved, and the product quality is stable and reliable, the bonding force can reach the level of a polyester type hot melt adhesive, and the bonding force of the hot melt adhesive is good.

Description

technical field [0001] The invention relates to the technical field of hot-melt adhesives, in particular to a polyether-type moisture-cured polyurethane hot-melt adhesive and a preparation method thereof. Background technique [0002] Moisture-curing polyurethane hot melt adhesive (PUR) is a special type of environmentally friendly solvent-free one-component polyurethane adhesive. Its main component is isocyanate-terminated polyurethane prepolymer, and its molecular structure contains polar and chemically active ammonia. Ester (-NHCOO-) or isocyanate (-NCO) groups. PUR has two processes of physical reaction and chemical reaction in the process of use: the physical reaction is the thermoplastic cold-setting performance of ordinary hot-melt adhesives, the glue is applied in a high-temperature fluid state, and the temperature is cooled quickly when it is attached; the chemical reaction is in the Within a few hours to a few days after bonding, the reactive groups of PUR chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/48
CPCC09J175/08C08G18/4812C08G18/4825C08G18/4829
Inventor 许磊鲍火华
Owner ZHEJIANG JOYA POLYMER TECH
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