Single-component reaction-type polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive, reactive technology, applied in the field of polyurethane hot-melt adhesive, can solve the problems of insufficient high and low temperature resistance and chemical pollution resistance, achieve good low temperature flexibility, improve high and low temperature resistance, and weaken the interaction. Effect

Active Publication Date: 2019-04-23
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned copolymer has good compatibility with the polyurethane prepolymer, and the obtained hot melt adhesive has excellent initial adhesion and final bonding strength, but its high and low temperature resistance and chemical pollution resistance are not enough

Method used

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  • Single-component reaction-type polyurethane hot melt adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] The composition of embodiment 1-4 and comparative example 1 sees the following table:

[0043] Component / part

A

B

C

D

E

F

G

H

Example 1

55

13

0.5

10

6

1

1

0

Example 2

60

17

0.35

6

12

3

2

0

Example 3

40

12

0.65

15

10

2

3

0

Example 4

50

15

0.5

12

8

2

5

0

Example 5

50

15

0.5

12

8

2

5

2

Comparative example 1

50

15

0.5

12

8

2

0

0

Comparative example 2

50

15

0.5

12

8

2

0

2

[0044] In the table above: A stands for polyol, B stands for polyisocyanate, C stands for catalyst, D stands for chain extender, E stands for tackifying resin, F stands for latent curing agent, G stands for plasticizer, H stands for vinyl unsaturated mono body.

[0045] In Examples 1-5 and Comparative Examples 1-2, the polyester polyol is XCP-3000H commerci...

Embodiment 6

[0051] Embodiment 6-10 is based on embodiment 5, difference is, the polyester polyol of embodiment 6 is polyethylene adipate diol, polyisocyanate is toluene diisocyanate, and catalyst is dimethylethanolamine; Embodiment 7 The plasticizer is dioctyl phthalate; the ethylenically unsaturated monomer of embodiment 8 is 1,2-dimethyl-3-(1-methylvinyl) cyclopentanol, the ethylene of embodiment 9 The base unsaturated monomer is 1,2-epoxy-4-vinylcyclohexane.

[0052] In the preparation process, the end point of the reaction between the polypolyol and the polyisocyanate is controlled so that the isocyanate content reaches 2.4%.

[0053] Peel strength (GB / T2791-95), thermal shock (ASTM D-746-40~80 ℃, 15 days), water resistance test ( 85°C 85% test before and after 1000 hours of shear strength) and salt spray resistance test (500 hours salt spray box sodium chloride 5%, test temperature 45°C), the test results are shown in the following table:

[0054]

Embodiment 8

[0056] In Example 8, the shear strength of the hot-melt adhesive coating film in the water resistance test increased significantly, indicating that the epoxy group in the 1,2-epoxy-4-vinylcyclohexane also played the role of a hydrolysis stabilizer to prevent ester bond Fracture and degradation of polymers. Therefore, preferred ethylenically unsaturated monomers are 1,2-epoxy-4-vinylcyclohexane and 1,2,8,9-bisepoxy-4-vinylcyclohexane with epoxy groups alkene.

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Abstract

The invention discloses single-component reaction-type polyurethane hot melt adhesive. The single-component reaction-type polyurethane hot melt adhesive is prepared from the following raw materials: polyurethane prepolymer, a chain extender, tackifying resin, a latent curing agent and filler, wherein the polyurethane prepolymer is formed by polymerizing polyalcohol with a molecular weight of 500 to 3000, polyisocyanate and a catalyst; and the raw material composition also comprises a plasticizer, wherein the plasticizer is dioctyl phthalate and/or diethylene glycol dibenzoate. The components of the single-component reaction-type polyurethane hot melt adhesive of the invention are mixed with plasticizers, the plasticizers are dioctyl phthalate and/or diethylene glycol dibenzoate, the two substances have high plasticizing efficiency for the polyurethane and low volatility and have good low-temperature flexibility; and by adding the plasticizers, the interaction between polymer macromolecular chains can be weakened, the elasticity and flexibility of the polymer materials of the polyurethane hot melt adhesive can be improved, and the high-temperature and low-temperature resistance of the hot melt adhesive can be improved.

Description

technical field [0001] The invention relates to the technical field of polyurethane hot-melt adhesives, in particular to a one-component reactive polyurethane hot-melt adhesive and a preparation method thereof. Background technique [0002] Traditional hot-melt adhesives are generally composed of thermoplastic substances, which are not heat-resistant and easily soluble in organic solvents. They are mainly used in products that do not require high heat resistance and bonding strength. In order to improve the bonding strength of the hot melt adhesive, the improved reactive polyurethane hot melt adhesive is made of isocyanate-terminated polyurethane prepolymer as the base material, and is prepared with tackifying resin, antioxidant, catalyst, filler, etc. The curing process of reactive polyurethane hot melt adhesive (PUR) is carried out in two stages, namely cooling condensation and moisture curing. In the first stage, PUR is the same as ordinary thermoplastic hot-melt adhesiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J11/06C09J11/08C09J4/06
CPCC09J4/06C09J11/06C09J11/08C09J175/06C08L45/00C08K5/12
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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