Preparation method of polyurethane hot-melt adhesive being sweat resistant

A polyurethane hot-melt adhesive and sweat-resistant technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve poor sweat corrosion resistance, low initial bonding strength, and sealant quality decline, etc. problems, to achieve the effect of excellent drop resistance, good sweat corrosion resistance, and increased salt spray corrosion resistance

Active Publication Date: 2017-05-10
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are many serious defects in traditional polyurethane hot melt adhesives, such as low initial bonding strength, poor impact resistance, poor aging resistance, and a core defect is poor sweat corrosion resistance.
With the increasingly miniaturized and lightweight trend of wearable products including mobile phones, the impact of user's sweat corrosion on product quality has become increasingly prominent. Up to now, there have been many cases of palm sweat corrosion, resulting in the deterioration of the sealant of mobile phones. Cases of severe decline

Method used

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  • Preparation method of polyurethane hot-melt adhesive being sweat resistant
  • Preparation method of polyurethane hot-melt adhesive being sweat resistant
  • Preparation method of polyurethane hot-melt adhesive being sweat resistant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Put 20 parts of hydroxyl-terminated liquid petroleum resin Novares LS500 and 40 parts of reactive elastomer POLVEST HT into the reaction kettle, dehydrate at 110°C and -0.095MPa for 2 hours, cool down to 70°C, add dibutyltin dilaurate 0.01 10 parts of German Bayer Desmodur N3300, stirred at 400 rpm, and reacted at 70°C for 3 hours. Then add 8 parts of silane modifier Y9669 and react at 70° C. for 5 hours to obtain a silane-terminated modified prepolymer.

[0034] 2) Dehydrate 10 parts of polyester polyol XCP-3000H, 70 parts of polyether polyol PPG220, and 35 parts of acrylic resin DB808 at 120°C and -0.095MPa for 2 hours. After dehydration, add 4,4' di 37 parts of phenylmethane diisocyanate MDI-100, stirred at 700 rpm, reacted at 120°C for 1 hour, then added 15 parts of silane-terminated modified prepolymer prepared in step a, antioxidant 1.0 parts of 264 doses, 0.1 parts of dimorpholino diethyl ether (DMDEE), heated up to 110 ° C, vacuumed to below -0.095 MPa, remo...

Embodiment 2

[0036] 1) Add 50 parts of hydroxyl-terminated liquid petroleum resin Novares LA300 and 10 parts of reactive elastomer POLVEST MA75 into the reactor, dehydrate at 110°C and -0.095MPa for 2 hours, cool down to 70°C, add 0.05 parts of stannous octoate, 40 parts of 2,4-toluene diisocyanate trimer were stirred at 700 rpm, and reacted at 80° C. for 1 hour. Then add 30 parts of silane modifier A189 and react at 80° C. for 2 hours to obtain a silane-terminated modified prepolymer.

[0037] 2) Dehydrate 30 parts of polyester polyol POL-356T, 40 parts of polyether polyol PPG204, and 15 parts of acrylic resin DB69 at 120°C and -0.095MPa for 2 hours. After dehydration, add 4,4' di 10 parts of phenylmethane diisocyanate MDI-100, 2 parts of toluene diisocyanate TDI-100, stirred at 400 rpm, reacted at 100°C for 3 hours, and then added the silane-capped modification prepared in step a. 50 parts of non-toxic prepolymer, 0.02 part of antioxidant 1010, 0.001 part of triethylenediamine, heating ...

Embodiment 3

[0039] 1) Add 35 parts of hydroxyl-terminated liquid petroleum resin Novares LA700 and 23 parts of reactive elastomer POLVEST HT into the reactor, dehydrate at 110°C and -0.095MPa for 2 hours, cool down to 70°C, add dibutyltin dilaurate 0.04 Parts, 26 parts of triphenylmethane triisocyanate (TTI), stirred at 550 rpm, reacted at 75°C for 2 hours. Then add 18 parts of silane modifier KH-550 and react at 75° C. for 3.5 hours to obtain a silane-terminated modified prepolymer.

[0040] 2) Dehydrate 20 parts of polyester polyol XCP-3000H, 32 parts of polyether polyol PPG210, 23 parts of polyether polyol PPG204, and 25 parts of acrylic resin DB29 at 120°C and -0.095MPa for 2 hours, dehydrate After completion, add 13 parts of 4,4' diphenylmethane diisocyanate MDI and 12 parts of toluene diisocyanate TDI100, stir at 550 rpm, react at 110°C for 3 hours, and then add this step a to prepare 32 parts of silane-terminated modified prepolymer, 0.05 part of antioxidant 1076, 0.04 part of dim...

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Abstract

The invention relates to a preparation method of a polyurethane hot-melt adhesive being sweat resistant. Terminal-hydroxyl liquid petroleum resin and terminal active liquid polybutadiene are used as a compound modifying agent, wherein the two components are both strong-hydrophobic monomers, so that a synergistic effect is achieved. Through a reaction with polyisocyanate and then molecular hybridization by a silane modifier, the compound modifying agent is significantly improved in anti-salt-spray-corrosion performance. The two components are flexible elastomers, so that the two components, as excellent flexibilizers, can effectively improve flexibility and anti-falling-impact performance. The polyurethane hot-melt adhesive is excellent in sweat corrosion resistance and has excellent comprehensive performance.

Description

technical field [0001] The invention relates to a preparation method of a sweat-resistant polyurethane hot melt adhesive, which belongs to the field of chemical adhesives. Background technique [0002] As we all know, the current design trend of mobile phones tends to be lighter, thinner and more beautiful. At present, hot-melt adhesives are generally used for the structural bonding of mobile phone touch screens and casings, especially polyurethane hot-melt adhesives (PUR), which have excellent weather resistance and high and low temperature resistance, and excellent bonding strength, and they can point out The glue line below 1mm is widely used in the bonding of narrow-frame mobile phones or tablets. [0003] However, traditional polyurethane hot melt adhesives have many serious defects, such as low initial bonding strength, poor impact resistance, poor aging resistance, and a core defect is poor sweat corrosion resistance. With the increasingly miniaturized and lightweig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C09J175/14C08G18/83C08G18/69C08G18/62C08G18/42C08G18/48C08G18/12
CPCC08G18/12C08G18/4018C08G18/4063C08G18/62C08G18/6216C08G18/698C08G18/837C08G2170/20C09J175/06C09J175/08C09J175/14
Inventor 姜贵琳王建斌陈田安解海华
Owner YANTAI DARBOND TECH
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