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Polyamide hot melt adhesive as well as preparation method and application thereof

A polyamide hot-melt adhesive and reaction technology, applied in the direction of adhesives, etc., to achieve the effects of expanding production, low processing temperature, and simple preparation method

Inactive Publication Date: 2022-04-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing research, there are still few reports on improving the toughness of polyamide hot melt adhesives.

Method used

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  • Polyamide hot melt adhesive as well as preparation method and application thereof
  • Polyamide hot melt adhesive as well as preparation method and application thereof
  • Polyamide hot melt adhesive as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 36.09g of nylon salt formed by the equimolar reaction of citric acid and hexamethylenediamine, 2g of succinic acid and 0.54g of a 1.5% aqueous solution of sodium hypophosphite into a polymerization vessel, and heat up to 150°C successively under nitrogen protection. React for 1.5 hours at 165°C for 1 hour, then remove the moisture in the late stage of the reaction to obtain a nylon segment prepolymer;

[0041] Put the above-mentioned nylon segment prepolymer, 3.39g polyethylene glycol (Mn=200) and 0.41g catalyst tetrabutyl titanate together into the polymerization vessel, raise the temperature to 165°C under the protection of nitrogen, and react after it is completely melted 1 hour, and vacuumize at 165°C to below 2000Pa for 1 hour, extract the obtained product with water at room temperature for 8 hours, change the water every two hours; pre-dry the product in a blast oven, and finally use a vacuum oven at 60°C Let dry for 12 hours.

[0042] The bonding strength an...

Embodiment 2

[0044] Add 35.91g of nylon salt formed by the equimolar reaction of citric acid and hexamethylenediamine, 2.5g of adipic acid and 0.54g of a 1.5% sodium hypophosphite aqueous solution into the polymerization vessel, and raise the temperature to 150°C sequentially under nitrogen protection React for 1.5 hours, react at 160°C for 2 hours, and then remove the water in the late stage of the reaction to obtain a nylon segment prepolymer;

[0045] Put the above-mentioned nylon segment prepolymer, 6.84g polypropylene glycol (Mn=400) and 0.45g catalyst tetrabutyl titanate together into the polymerization vessel, raise the temperature to 170°C under the protection of nitrogen, and react for 1 hour after it is completely melted , and evacuated at 170°C to below 2000Pa to react for 2 hours, extract the obtained product with water at room temperature for 8 hours, and change the water every two hours; pre-dry the product in a blast oven, and finally dry it in a vacuum oven at 60°C for 12 H...

Embodiment 3

[0048] 35.51g of nylon salt formed by the equimolar reaction of citric acid and octyldiamine, 2.5g of adipic acid and 0.71g of 2% sodium hypophosphite aqueous solution were added to the polymerization vessel, and the temperature was sequentially raised to 140°C under nitrogen protection. ℃ for 2 hours, 160℃ for 1 hour, and then remove the water in the late stage of the reaction to obtain a nylon segment prepolymer;

[0049] Put the above-mentioned nylon segment prepolymer, 6.84g polypropylene glycol (Mn=400) and 0.67g catalyst tetrabutyl titanate together into the polymerization vessel, raise the temperature to 170°C under the protection of nitrogen, and react for 1 hour after it is completely melted , and evacuated at 170°C to below 2000Pa to react for 2 hours, extract the obtained product with water at room temperature for 8 hours, and change the water every two hours; pre-dry the product in a blast oven, and finally dry it in a vacuum oven at 60°C for 12 Hour;

[0050] The...

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Abstract

The invention discloses a polyamide hot melt adhesive as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out a melt block copolymerization reaction on a carboxyl-terminated nylon prepolymer and hydroxyl-terminated polyether polyol to obtain the polyamide hot melt adhesive, or directly carrying out melt random copolymerization on different types of nylon segment monomers to obtain the structural polyamide hot melt adhesive, according to the polyamide hot melt adhesive, due to high amido bond density, more hydrogen bonds can be formed among molecular chains, and introduced polyether polyol or polyether amine can have relatively high chain segment flexibility, so that a uniform dynamic network structure exists in the polyamide hot melt adhesive, and the bonding strength and the bonding toughness of the polyamide hot melt adhesive are improved; a new idea is provided for high performance of the hot melt adhesive; the polyamide hot melt adhesive can be widely applied to preparation of electronic devices, food packages, clothing leather bags, building materials and the like, the bonding strength of the polyamide hot melt adhesive is 1.57-10.84 MPa, the bonding toughness of the polyamide hot melt adhesive is 441.6-2790.4 J / m < 2 >, and the complex viscosity of the polyamide hot melt adhesive at the high temperature of 130 DEG C is 5-42 Pa.s.

Description

technical field [0001] The invention belongs to the field of adhesive properties of polymer materials, and in particular relates to a polyamide hot-melt adhesive and its preparation method and application. Background technique [0002] Hot melt adhesive refers to a material that can firmly bond two substances together after heating. It is characterized in that it can be melted by heating and bonded by cooling. It has the characteristics of good stability, short curing time, no solvent, and recyclable. It is widely used in packaging, textiles, building materials, wood products, auto parts and other fields. middle. In recent years, the rise of emerging industries (rail transportation, smart materials, electronic devices) and other industries has promoted the upgrading of the traditional performance of the adhesive industry, increasing its functionality and high-end performance; The national standard of "Limits of Sexual Organic Substances", the policy of safety, environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J177/06C08G69/40
CPCC09J177/06C08G69/40
Inventor 王玉忠陈思维卢鹏邓聪赵泽永
Owner SICHUAN UNIV
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