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Solvent-free synthesis method for ultra-low temperature resistant polyurethane pressure-sensitive adhesive

A synthesis method and pressure-sensitive adhesive technology, applied in the field of solvent-free synthesis, can solve the problems of environmental protection, unfavorable health of operators, and no reported performance, etc., and achieve the effect of good bonding strength and high bonding strength

Inactive Publication Date: 2015-01-14
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low temperature of the pressure-sensitive adhesive produced can only be used above -73°C, and the performance at ultra-low temperature has not been reported. Toluene was used as a solvent during synthesis, which is not environmentally friendly and is not conducive to the health of operators.
[0007] For example, in reference 2 "Research on Solvent-Free Polyacrylate Pressure-Sensitive Adhesives", a method for bulk polymerization of acrylate pressure-sensitive adhesives is proposed to synthesize solvent-free acrylate pressure-sensitive adhesive prepolymers, but Due to its molecular structure, acrylic pressure-sensitive adhesives can only meet the conditions of use above -40°C, and are not suitable for ultra-low temperature conditions.

Method used

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  • Solvent-free synthesis method for ultra-low temperature resistant polyurethane pressure-sensitive adhesive
  • Solvent-free synthesis method for ultra-low temperature resistant polyurethane pressure-sensitive adhesive
  • Solvent-free synthesis method for ultra-low temperature resistant polyurethane pressure-sensitive adhesive

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preparation example Construction

[0029] The preparation method of the present invention will be described in detail below.

[0030] (1) Dehydration of polyether polyols:

[0031] For example figure 1 As shown, add N-220 in the three-necked flask 3, put the rubber stopper 5 inserted with the thermometer 6 into the middle port of the three-necked flask 3, plug the side port with a glass stopper 4, fix the three-necked flask 3, and Place heating type magnetic stirrer 1, oil bath 2 successively under flask 3. Then install the adapter 7 at the other side port of the three-necked flask 3, then connect the condensation pipe 9 equipped with the rubber outlet pipe 8 and the rubber inlet pipe 10 with the adapter 7, and place the Erlenmeyer flask 11 on the condensation pipe after the connection is completed. directly below the exit.

[0032] After all equipments are connected, turn on the heating magnetic stirrer 1, heat while stirring, and heat the oil bath 2 to dehydrate the N-220 or N-330. Here, the dehydration t...

Embodiment 1

[0048] (1) Dehydration of polyether polyols:

[0049] Put polyether polyol N-220 or polyether polyol N-330 into the three-necked flask 3, connect the equipment, heat while stirring, and heat the oil bath 2 to 120±5°C for N-220 or N- 330 for dehydration treatment for 3h.

[0050] (2) Synthesis of terminal-NCO-based prepolymers:

[0051] Add dehydrated polyether polyol N-220 into the three-necked flask 3, connect the equipment, heat while stirring, add TDI dropwise into the three-necked flask 3 to react with the polyether polyol N-220, and control the temperature at 40°C. After the dropwise addition of TDI, the temperature was raised using oil bath 2 to keep the reaction temperature at 75°C, and the reaction was refluxed for 3 hours. After the prepolymerization reaction of TDI and N-220 was completed, the material temperature was lowered to room temperature.

[0052] In addition, in the synthesis of the end-NCO group prepolymer, the ratio of the toluene diisocyanate TDI to the...

Embodiment 2

[0057] The polyurethane pressure-sensitive adhesive A2 was obtained in the same manner as in Example 1, except that the temperature during TDI dropwise addition in the synthesis of (2) terminal-NCO group prepolymer in Example 1 was set at 35°C.

[0058] Pressure-sensitive adhesive A2, the bonding strength is 1.0MPa (aluminum-aluminum) at room temperature, and 13MPa (aluminum-aluminum) at -196°C.

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Abstract

The invention discloses a solvent-free synthesis method for an ultra-low temperature resistant polyurethane pressure-sensitive adhesive. By adopting a prepolymer method, the method includes: firstly, synthesizing an -NCO- terminated prepolymer from toluene diisocyanate (TDI) and bifunctional polyether polyol (N-220), and then mixing the prepolymer with trifunctional polyether polyol (N-330), coating release paper with the mixture, and carrying out heating curing to obtain an ultra-low temperature resistant polyurethane pressure-sensitive adhesive film. The ultra-low temperature resistant polyurethane pressure-sensitive adhesive prepared by the method provided by the invention has normal temperature bonding strength of greater than or equal to 1.0MPa (aluminum-aluminum), and -196DEG C bonding strength of greater than or equal to 13MPa (aluminum-aluminum). The adhesive is suitable for rapid bonding of parts used in an ultra-low temperature environment.

Description

[0001] technical field [0002] The invention relates to a synthesis method of polyurethane pressure-sensitive adhesive, in particular to a solvent-free synthesis method of ultra-low temperature resistant polyurethane pressure-sensitive adhesive. [0003] Background technique [0004] Pressure-sensitive adhesive refers to an adhesive that is sensitive to pressure and does not require heating or solvent activation. As long as it is properly pressurized, it can be glued together. It is used in a wide range due to its convenience and quickness of use. In the field of cryogenic liquid storage and transportation, there is a need for an ultra-low temperature-resistant pressure-sensitive adhesive capable of achieving high bonding strength at ultra-low temperatures. [0005] However, although there are many types of pressure-sensitive adhesives, there are mainly acrylate copolymer pressure-sensitive adhesives, styrene-isoprene-styrene block copolymers and styrene-butadiene-styr...

Claims

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Application Information

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IPC IPC(8): C09J175/08C08G18/48C08G18/10
Inventor 南博华何腾锋胡翌超郭立杰赵萧王琳郝冬冬
Owner SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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