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Preparation method for reactive polyurethane hot melt composition and applications thereof

A polyurethane hot-melt adhesive, reactive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of difficult disassembly, easily damaged parts, etc., and achieves convenient use and recycling. The effect of reuse and high bonding strength

Active Publication Date: 2013-09-11
SHANGHAI ZHIGUAN HIGH POLYMER MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a reactive polyurethane hot-melt adhesive composition and its application to overcome the disassembly of traditional hot-melt adhesives and polyurethane hot-melt adhesives when valuable parts are recycled and reused. Solve the problem of difficult and fragile parts

Method used

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  • Preparation method for reactive polyurethane hot melt composition and applications thereof
  • Preparation method for reactive polyurethane hot melt composition and applications thereof
  • Preparation method for reactive polyurethane hot melt composition and applications thereof

Examples

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preparation example Construction

[0055] The preparation method of sample in the embodiment:

[0056] The preparation method of the composition described in embodiment 1 to embodiment 13 is a one-step method, as follows:

[0057] Add all polyester polyols, polyether polyols and thermoplastic polymer resins to the reactor equipped with gas inlet and outlet joints, thermometers, stirrers, heating systems and vacuum systems, heat and stir and melt under vacuum and mix and dehydrate To obtain a homogeneous mixture with a moisture content of less than 0.05% by mass, then add polyisocyanate to carry out polymerization reaction, the polymerization reaction is carried out under the protection of dry inert gas, and accompanied by proper stirring and mixing, until the reaction is completed, to obtain the reaction Type polyurethane hot melt adhesive composition. Then the obtained reactive polyurethane hot-melt adhesive composition is placed in a container, and the inner space of the container is protected with dry nitro...

Embodiment 14

[0058] The preparation method of the composition described in embodiment 14 is a two-step method, as follows:

[0059] The first step: Synthesis of diisocyanate group-terminated prepolymer compound 1

[0060] Add 800g of polyether diol (hydroxyl value 110mgKOH / g) to the reactor equipped with gas inlet and outlet joints, thermometer, stirrer, heating system and vacuum system, heat, stir and vacuumize to remove water until the moisture content is lower than 250ppm, add 590g of 4,4'-MDI into the reactor according to the ratio of NCO / OH of 3:1, carry out the polymerization reaction under the protection of heating, stirring and dry inert gas, and measure the content of isocyanate group during the reaction. When the content of isocyanate groups decreases continuously and finally reaches a stable value, the unreacted monomer 4,4'-MDI in the reactor is distilled off by vacuuming, and the -NCO content is measured by sampling during the process until the -NCO content reaches a stable va...

Embodiment 15

[0064] The first step: Synthesis of diisocyanate group-terminated prepolymer compound 2

[0065] The method is the same as the first step in Example 14, except that 800 g of polyester diol (hydroxyl value: 110 mgKOH / g) is used instead of polyether diol.

[0066] Step 2: Synthesis of Hot Melt Adhesive Composition

[0067] The prepolymer compound 2 was used to replace the prepolymer compound 1, and the others were combined according to the formula of this example to synthesize a composition.

[0068] Table 1 is synthesized and has reactive polyurethane hot-melt adhesive composition formula

[0069]

[0070] Table 2 synthesis has reactive polyurethane hot-melt adhesive composition formula

[0071]

[0072]

[0073] Table 3 The changes in the bonding strength of each embodiment composition at different temperatures

[0074]

[0075]

[0076] Table 1 and Table 2 are the formulas for synthesizing reactive polyurethane hot melt adhesive compositions. From the test r...

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Abstract

The invention relates to a preparation method for a reactive polyurethane hot melt composition. The preparation method comprises steps of adding polyol and thermoplastic polymer resin into a reactor; heating, mixing, fusing under vacuum, and performing mixed dehydration to obtain a homogeneous mixture of which a quality content of water is lower than 0.05%; adding polyisocyanate or isocyanate-terminated prepolymer to carry out polymerization under the protection of insert gases; and stirring until the reaction is completed to obtain the reactive polyurethane hot melt adhesive composition. The hot melt provided by the invention is advantageous in that bonding strength is high; bonded parts that are solidified can be manually disassembled after the bonded parts are heated; hot melt that is crosslinked and solidified can be easily removed from the surfaces of the bonded parts with no residual; and therefore valuable electronic devices are protected from being damaged, and precision electronic instruments and devices can be recycled and reused.

Description

technical field [0001] The invention relates to an adhesive, in particular to a preparation method and application of a reactive polyurethane hot-melt adhesive composition. Background technique [0002] Hot melts are adhesives based on thermoplastic polymers. The adhesive is solid at room temperature, and softens into a fluid viscous liquid when heated for application sizing. After sizing, the colloid cools and becomes solid again to achieve bonding strength. Traditional hot melt adhesives are non-reactive adhesives, which will soften or melt again when heated again, thus losing their bonding strength. Reactive hot-melt adhesives, especially moisture-curing polyurethane hot-melt adhesives, overcome these shortcomings well. Before curing, it is still a thermoplastic polymer, which can be melted by heating and sizing; after sizing, the colloid will cross-link with moisture and solidify to achieve the final bonding strength, and the cured colloid is an insoluble and infusible...

Claims

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Application Information

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IPC IPC(8): C09J175/04C08G18/62C08G18/48C08G18/42C08G18/10
Inventor 贾成良王伟
Owner SHANGHAI ZHIGUAN HIGH POLYMER MATERIAL CO LTD
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