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EVA hot melt adhesive composition containing linear hydroxyl-terminated polyurethane resin

A technology of hydroxyl-terminated polyurethane and hot melt adhesive, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., and can solve problems such as low bonding strength, resistance to high and low temperatures, and high prices

Inactive Publication Date: 2010-07-28
山东久隆高分子材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, EVA hot melt adhesive also has obvious disadvantages: the main reason is that the bonding strength is low, it is not resistant to high and low temperature, and it is not resistant to fat oil. It needs to be modified to adapt to a wider range of applications.
Thermoplastic polyurethane (TPU) is obtained from the reaction of macromolecular diols, diisocyanates and short-chain diols. It contains both soft and hard segments, exhibits elasticity and thermoplasticity, and has two phases corresponding to hard and soft phases, respectively. Excellent glass transition temperature, elasticity and wear resistance, but high price

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Linear hydroxyl-terminated polyurethane resins were prepared using the solvent-free prepolymer method described previously.

[0051]20 kg of polybutylene adipate diol (PBA) with a number average molecular weight of 2000; Alcohol moisture content is less than 0.05%. Then add 5 grams of catalyst dibutyltin dilaurate, mix thoroughly at a temperature of 80°C, and then fully mix with the required amount of TDI1003.96 kg for 1 hour, and mix under the protection of an inert atmosphere and nitrogen flow. Add 360 grams of chain extender 1,4-butanediol (1,4-BDO) and mix thoroughly, then quickly degas the mixture under vacuum, then pour the mixture into a heated mold treated with release compound , curing in a mold at 100°C for 2 hours, and then post-curing the product at a high temperature of 120°C for 8 hours to form the linear hydroxyl-terminated polyurethane resin required by the present invention.

[0052] Then this linear hydroxyl-terminated polyurethane resin and other co...

Embodiment 2

[0071] The linear hydroxyl-terminated polyurethane resin was prepared by screw extrusion.

[0072] 30 kg of polybutylene adipate diol (PBA) with a number average molecular weight of 3000 and 20 kg of polyoxyethylene glycol (PEG) with a number average molecular weight of 3500 were vacuum dehydrated at 120°C for 2 hours to make the poly Alcohol moisture content is less than 0.05%; mix the above mixture with 3.92 kg TDI80 / 20, 220 g 1,4-butanediol (1,4-BDO), and 5 g catalyst dibutyltin dilaurate, and enter the high-speed Mixing head, high-speed mixing for 0.5-1min, so that the whole system is evenly dispersed under the action of high-speed stirring, and the stirring speed is 3500r / min. The mixture enters the twin-screw extruder after high-speed stirring, the length-to-diameter ratio is 64:1, the reaction time of the material in the extruder is 3-5 minutes, the reaction temperature is 150-180°C, and the temperature of the extruder is set as: The first zone is 90±10°C, the second z...

Embodiment 3

[0090] Linear hydroxyl-terminated polyurethane resins were prepared using the solvent / prepolymer method described previously.

[0091] 20 kg of polybutylene adipate diol (PBA) with a number average molecular weight of 2000; The alcohol moisture content is less than 0.05%; the above mixture and 5 grams of bis (2,2-morpholine ethyl) ether are dissolved in anhydrous toluene, heated to 90 ± 5 ° C, and then mixed with 4.95 kg of MDI in an inert atmosphere such as nitrogen flow Stir well under protection for 2 hours until the reaction is complete. The solvent was then distilled off from the mixture, and the mixture was post-aged for 12 hours under vacuum at 120°C. It can then be further processed to prepare an EVA hot melt adhesive composition containing a linear hydroxyl-terminated polyurethane resin.

[0092] Then this linear hydroxyl-terminated polyurethane resin is fully mixed with the components of the parts shown in the following table (Table 8), and is further processed int...

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Abstract

The invention discloses an EVA hot melt adhesive composition containing a linear hydroxyl-terminated polyurethane resin, which comprises the linear hydroxyl-terminated polyurethane resin, an ethylene-vinyl acetate polymer, a tackifier, waxes, an antioxidant, an ultraviolet stabilizer, a filling material, a fire retardant and the like. The EVA hot melt adhesive composition containing the linear hydroxyl-terminated polyurethane resin is used for improving the early strength, the final strength and the high- and low-temperature resistance performances of the EVA hot melt adhesive compositions.

Description

technical field [0001] The invention relates to an EVA hot-melt adhesive composition, in particular to an EVA hot-melt adhesive composition containing a linear hydroxyl-terminated polyurethane resin. Background technique [0002] EVA hot melt adhesive (EVA hot melt adhesive) is based on ethylene-vinyl acetate thermoplastic polymer (Ethylene Vinyl acetate copolymer) as the main material, and other polymers such as tackifiers, waxes, plasticizers, antioxidants, fillers, etc. A new type of synthetic adhesive made by melting and blending materials. It is solvent-free and 100 percent solids. Safe transportation and convenient storage, low energy consumption and easy operation. The adhesive is softened and melted in a fluid state by heating to coat the bonding interface, and the bonding is achieved by cooling and solidifying within a short period of time away from the heat source. [0003] Ethylene-vinyl acetate (EVA) hot-melt adhesive is the most widely used and most used hot-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J123/08C09J175/06C09J175/08
Inventor 张荣军律微波孟宪铎李如钢张利王林
Owner 山东久隆高分子材料有限公司
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