Low softening point thermoplastic polyurethane hot melt adhesive and preparation method thereof

A thermoplastic polyurethane, low softening point technology, used in the field of polymer adhesives, can solve the problem of less attention to hot melt adhesives, and achieve the effects of reducing cohesive energy, mild reaction conditions, and reducing intermolecular forces

Inactive Publication Date: 2014-10-15
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, at present, thermoplastic polyurethane hot melt adhesives with low softening point and good bonding strength (>4MPa) have received less attention.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 100g of polyethylene glycol (molecular weight: 1000) and 800g polyethylene glycol (molecular weight: 8000) into the reaction kettle, raise the temperature to 100°C-112°C under nitrogen protection, dehydrate until no water evaporates, and cool down to 65°C.

[0028] Weigh 48.5g of 4,4'-diphenylmethane diisocyanate MDI according to the amount of the substance being 0.97 times the amount of the hydroxyl substance in polyethylene glycol, melt it and evenly add it to the reactor within 2h, and control the The reaction temperature is 110°C-118°C, and the reaction is 3h.

[0029] Add 2.48 g of chain extender ethylene glycol according to the amount of the substance being 0.2 times the amount of the polyethylene glycol substance; stop heating after 1 hour of reaction, and discharge the material to obtain a polyurethane hot melt adhesive. The softening temperature of the hot melt adhesive is 70°C, and the bonding shear strength to aluminum Ly-12 is 4.2MPa.

Embodiment 2

[0031] Add 194g of polyethylene glycol (molecular weight 2000) and 6g polytetrahydrofuran glycol PTMG (molecular weight 1000) into the reaction kettle, raise the temperature to 110°C-115°C under nitrogen protection, dehydrate until no water evaporates, and cool down to 60°C.

[0032] The amount of the substance is 0.98 times the sum of the hydroxyl substances in polyethylene glycol and polytetrahydrofuran diol. Weigh 17.6 g of toluene diisocyanate TDI, and add it into the reactor evenly within 2.5 hours. After the addition, control the reaction temperature to 112 ℃~120℃, react for 2h.

[0033] Add 1.28 g of chain extender diethylene glycol according to the amount of the substance being 0.2 of the sum of the amounts of the polyethylene glycol and polytetrahydrofuran glycol; stop heating after 45 minutes of reaction, and discharge to obtain a polyurethane hot melt adhesive. The softening temperature of the hot melt adhesive is 72°C, and the bonding shear strength to aluminum Ly-...

Embodiment 3

[0035] Add 190g of phthalic anhydride polyester polyol (molecular weight 2000) and 10g polytetrahydrofuran glycol PTMG (molecular weight 1000) into the reaction kettle, raise the temperature to 120℃~126℃ under the protection of nitrogen, dehydrate until no water evaporates, and cool down to 68℃.

[0036] The amount of the substance is 1.01 times the sum of the amount of hydroxyl substances in phthalic anhydride polyester polyol and polytetrahydrofuran diol. Weigh 26.5g of 4,4'-diphenylmethane diisocyanate MDI, melt it and add it into the reaction evenly within 3h In the kettle, control the reaction temperature at 110°C to 116°C after the feeding is completed, and react for 2.5 hours.

[0037] The amount of the substance is 0.25 times of the sum of the amount of the phthalic anhydride polyester polyol and polytetrahydrofuran diol, and the chain extender ethylene glycol is added; the reaction is stopped for 25 minutes, and the heating is stopped, and the polyurethane hot melt adh...

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Abstract

The invention discloses a low-softening point thermoplastic polyurethane hot melt adhesive and a preparation method thereof. The hot melt adhesive comprises the following components: 95-100 parts by weight of polyester polyol; 0-5 parts by weight of polyether diol; diisocyanate; and a chain extender. The preparation method consists of: adding polyester polyol and polyether diol into a reaction kettle, raising the temperature to 100DEG C-130DEG C under the protection of nitrogen, conducting dehydration till no water vapor is steamed, and lowering the temperature to 60-70DEG C; adding diisocyanate into the reaction kettle evenly within 2-3h, then leaving the materials to react for 2-4h at a temperature of 110-120DEG C; and adding the chain extender into the reaction kettle to react till wire drawing, and then stopping heating. The thermoplastic polyurethane hot melt adhesive provided in the invention has a softening point lower than 100DEG C and bonding strength on aluminum Ly-12 up to over 4MPa. Besides, the preparation method of the thermoplastic polyurethane hot melt adhesive is simple, reaction conditions are mild, and each technology parameter is easy to control, so that the thermoplastic polyurethane hot melt adhesive can be produced in large scale.

Description

technical field [0001] The invention relates to the field of polymer adhesives, in particular to a thermoplastic polyurethane hot-melt adhesive with low softening point and good bonding strength and a preparation method thereof. Background technique [0002] The use of bonding technology to realize the connection between components can not only avoid deformation, stress concentration, and overall strength loss caused by riveting, welding and other connection methods, but also shorten the assembly cycle and reduce weight. Therefore, adhesives have been widely used. Adhesives can be divided into two categories: thermosetting and thermoplastic. Thermoplastic adhesives have the function of being disassembled after bonding, especially some precision parts need to be replaced after bonding due to parts aging, damage and other reasons. The use of thermoplastic adhesives makes partial replacement of parts possible, which not only saves updating time and cost savings. Thermoplastic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C08G18/76C08G18/75C08G18/66C08G18/48C08G18/42
Inventor 廖宏韩建军王浩旭
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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