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Polypropylene carbonate moisture-curable polyurethane hot-melt adhesive and preparation method thereof

A polypropylene carbonate and polyurethane hot melt adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as poor mechanical properties, limitations, and low glass transition temperature, and achieve Effect of Good Adhesive Properties

Inactive Publication Date: 2017-08-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its low glass transition temperature and poor mechanical properties limit its applications, especially as engineering plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 50 parts of polypropylene carbonate (Mn=2000) and 50 parts of polytetrahydrofuran ether glycol (Mn=2000) into the reaction kettle, dehydrate at 110°C for 2 hours; cool to 60°C, fill with nitrogen, and take 20 parts Diphenylmethane diisocyanate was slowly added to the reaction kettle, and then the temperature was slowly raised. The temperature was controlled at 110°C while reacting for 2 hours under the protection of nitrogen; after the reaction, 0.1 part of dibutyltin dilaurate was added, and then pumped at 110°C. Vacuum until no bubbles appear, then discharge the material and seal the package.

[0028] According to the test method, the tensile shear strength of the adhesive to stainless steel, aluminum, PC, PMMA, and ABS are 3.93MPa, 3.67MPa, 5.54MPa, 3.81MPa, and 1.71MPa, respectively.

Embodiment 2

[0030] Take 25 parts of polypropylene carbonate (Mn=2000), 25 parts of polyhexylene adipate glycol (Mn=2000), and 50 parts of polytetrahydrofuran ether glycol (Mn=2000) into the reaction kettle. Dehydrate at 110°C for 2 hours; cool to 60°C, fill with nitrogen protection, slowly add 20 parts of diphenylmethane diisocyanate to the reactor, then slowly increase the temperature, control the temperature at 110°C, and react for 2 hours under nitrogen protection; After the completion, add 0.1 part of dibutyl tin dilaurate, then vacuumize at 110°C until no bubbles appear, then discharge the material and seal the package.

[0031] According to the test method, the tensile shear strength of the adhesive to stainless steel, aluminum, PC, PMMA, and ABS is 2.86 MPa, 2.41 MPa, 5.78 MPa, 3.62 MPa, and 1.65 MPa, respectively.

Embodiment 3

[0033] Take 50 parts of polypropylene carbonate (Mn=2000) and 50 parts of polyethylene adipate diol (3000) into the reaction kettle, dehydrate at 110°C for 1.5 hours; cool to 60°C, and fill with nitrogen for protection, Take 18 parts of diphenylmethane diisocyanate slowly into the reactor, then slowly increase the temperature, control the temperature at 120℃, and react for 3.5 hours under nitrogen protection, then vacuum at 110℃ until no bubbles appear, and then discharge the material sealed package.

[0034] According to the test method, the tensile shear strength of the adhesive to iron, stainless steel and aluminum are 7.50MPa, 5.22MPa, and 5.09MPa, respectively.

[0035] Note: Examples 1 to 3, after the adhesive is prepared, when bonding the substrates (iron, stainless steel, aluminum, PC, PMMA, ABS), the bonding process is as follows: first turn on the heating system and set the temperature to 90-120℃, let the synthesized adhesive be heated at this temperature for 10-30 minut...

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PUM

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Abstract

The invention relates to a polypropylene carbonate moisture-curable polyurethane hot-melt adhesive and a preparation method thereof. The polypropylene carbonate moisture-curable polyurethane hot-melt adhesive is composed of, by weight part, 10-30 parts of polyisocyanates, 20-75 parts of polypropylene carbonate, 0-60 parts of polyether polyol, 0-60 parts of polyester polyol and 0-0.5 part of catalyst. The preparation method comprises adding the polypropylene carbonate, the polyether polyol and the polyester polyol into a reactor, performing dehydration during vacuum melting to obtain a dried polyol mixture; cooling down to 60-80 DEG C, filling nitrogen in for protection, slowly adding the polyisocyanates into the mixture for reaction at 60-120 DEG C for 1-4 hours, then adding in the catalyst, performing vacuumization until no bubbles exist, and then performing discharging and sealed packaging to obtain the polypropylene carbonate moisture-curable polyurethane hot-melt adhesive.

Description

Technical field [0001] The invention belongs to the field of polyurethane hot melt adhesive and its preparation, and particularly relates to a polypropylene carbonate-based moisture-curing polyurethane hot melt adhesive and a preparation method thereof. Background technique [0002] Moisture-curing polyurethane hot melt adhesives are widely used in construction, automobiles, electronics, packaging, and manufacturing due to their high bonding strength, wide bonding range, simple production process, no organic solvents, good heat resistance and solvent resistance, etc. Shoes and other fields. It is mainly prepared by polyester polyol, polyether polyol and excess polyisocyanate under certain reaction conditions, but the raw materials of polyester polyol and polyether polyol currently used are mainly derived from non-renewable petrochemical resources. Therefore, looking for a renewable macromolecular polyol to replace traditional polyester polyols and polyether polyols to prepare mo...

Claims

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Application Information

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IPC IPC(8): C09J175/08C08G18/44C08G18/42C08G18/48C08G18/76
Inventor 游正伟刘增贺
Owner DONGHUA UNIV
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