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A method for blocking air moisture in the surface layer of pur adhesive

A technology of adhesives and air, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve problems such as product scrapping, shortening the actual application effect of packaging, and improper control

Active Publication Date: 2022-03-15
无锡博锦高分子研究发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improper control will greatly shorten the actual application effect of the packaging and even make the product scrapped

Method used

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  • A method for blocking air moisture in the surface layer of pur adhesive
  • A method for blocking air moisture in the surface layer of pur adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A hydroxyl-terminated prepolymer, comprising: 42 parts of polyether polyol (brand PPG2000), 10 parts of petroleum resin (brand W100), 40 parts of solid acrylic resin (brand AC52), EVA resin (brand ArlanxeoEVA686) 4 parts, diisocyanate (brand MDI-50) 4 parts; the design hydroxyl value is 6.6, and the density measured by the density cup is 1.0g / cm 3 , the viscosity of the product at 120C is 103000cps.

[0049] The preparation method of the above-mentioned hydroxyl-terminated prepolymer, the steps are as follows:

[0050] (1) Add polyether polyol to the reaction kettle, stir evenly, raise the temperature to about 120°C, add petroleum resin, solid acrylic resin and EVA resin while stirring, increase the stirring speed, and raise the temperature to 140°C for 1 hour. Under vacuum degree -0.1MPa, dehydrate for 1h;

[0051] (2) Cool down to 115-120°C, add MDI-50, and react at 125-130°C for 2 hours;

[0052] (3) Discharge, placed in aluminum foil bags or other containers.

...

Embodiment 2

[0058] A hydroxyl-terminated prepolymer, its raw material composition, recorded in parts by mass, includes: 42 parts of polyether polyol (brand PPG2000), 42 parts of solid acrylic resin (brand AC52), fumed silica (brand R202 ) 2 parts, diisocyanate (brand MDI-50) 4 parts; viscosity modifier L705 10 parts; design hydroxyl value is 9.4, density measured by density cup is 0.95g / cm 3 , the viscosity of the product at 120C is 71000cps.

[0059] The preparation method of the above-mentioned hydroxyl-terminated prepolymer, the steps are as follows:

[0060] (1) Add polyether polyol, fumed silica, and viscosity modifier into the reaction kettle, stir evenly, heat up to about 120C, add solid acrylic resin while stirring, increase the stirring speed, and heat up to 140C for 1 hour, Under vacuum -0.1MPa, dehydrate for 1h;

[0061] (2) Cool down to 115-120°C, add MDI-50, and react at 125-130°C for 2 hours;

[0062] (3) Discharge, placed in aluminum foil bags or other containers.

[00...

Embodiment 3

[0065] A hydroxyl-terminated prepolymer, its raw material composition, recorded in parts by mass, includes: 40 parts of polyether polyol (brand name PPG2000), 40 parts of solid tackifying resin (W100), EVA resin (brand name Arlanxeo EVA686) 2 parts, 4 parts of viscosity regulator L705, 4 parts of diisocyanate (brand MDI-50); the design hydroxyl value is 5.5, and the density measured by density cup is 0.98g / cm 3 , the viscosity of the product at 120C is 61700cps.

[0066] The preparation method of the above-mentioned hydroxyl-terminated prepolymer, the steps are as follows:

[0067](1) Add polyether polyol, fumed silica, and viscosity regulator to the reaction kettle, stir evenly, raise the temperature to about 120°C, add solid acrylic resin while stirring, increase the stirring speed, and raise the temperature to 140°C to keep 1h, dehydration for 1h under vacuum degree -0.1MPa;

[0068] (2) Cool down to 115-120°C, add MDI-50, and react at 125-130°C for 2 hours;

[0069] (3)...

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Abstract

The invention relates to the technical field of PUR adhesive storage, in particular to a method for blocking air moisture on the surface of the PUR adhesive. A method for blocking air moisture on the surface of PUR adhesives, providing a kind of adhesive with a hydroxyl value between 2-20 and a density of 0.85-1.0g / cm 3 The hydroxyl-terminated prepolymer; the hydroxyl-terminated prepolymer and the reactive PUR adhesive react chemically at the interface to form a cross-linked cured layer. This kind of interfacial reaction makes two homosexual or heterosexual hot melt adhesives not cause interfacial delamination during storage, coupled with the softness of the upper thermoplastic hot melt adhesive, it is suitable for the surface of packaging materials such as PE, PP, aluminum or steel. It has relatively good wettability and adhesion, so it does not need secondary aluminum foil packaging after the reactive polyurethane adhesive canned, which improves production efficiency, saves production costs, and simplifies packaging procedures.

Description

technical field [0001] The invention relates to the technical field of PUR adhesive storage, in particular to a method for blocking air moisture on the surface of the PUR adhesive. Background technique [0002] Moisture-curing polyurethane hot-melt adhesive is a kind of NCO-terminated hot-melt adhesive. Compared with traditional EVA or polyester and other types of non-reactive hot-melt adhesives, because of the reactivity of its NCO-terminated, its ultimate strength It is much higher than traditional hot melt adhesives, and it has unique advantages in high temperature resistance, chemical resistance and weather resistance; compared with traditional oil glue, it does not contain any solvent components, and is an environmentally friendly adhesive. , under the increasingly severe environmental protection situation, it is imminent to replace solvent-based adhesives with solvent-free adhesives. Because of these two advantages, moisture-curing polyurethane hot melt adhesives have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/08C08L75/04C08L57/02C08L33/04C08L23/08C08K7/26C08G18/48C08G18/62C08G18/10C09J175/04
CPCC08L75/08C08L75/04C08G18/48C08G18/6208C08G18/10C09J175/04C08L2205/035C08L2205/03C08L57/02C08L33/04C08L23/0853C08K7/26
Inventor 陈旨进王磊
Owner 无锡博锦高分子研究发展有限公司
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