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Nano modified polyurethane adhesive and preparation method thereof

A polyurethane adhesive and nano-modification technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive additives, etc., can solve problems such as low solid content of adhesives, slow drying speed, and unstable systems. Achieve the effect of low organic volatile content, low cost and high solid content

Inactive Publication Date: 2013-02-27
苏州井上高分子新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this adhesive, such as low solid content, poor water resistance, slow drying speed and unstable system, seriously restrict its wide application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh the following raw materials:

[0026] PBA2000 50g

[0027] KGF2000 50g

[0028] MDI 33.5g

[0029] DMPA 8g

[0030] NMP 8g

[0031] Triethylamine 3.7g

[0032] Nano-montmorillonite 0.5g

[0033] Diethylamine 0.1g.

[0034] Step a, polyester, polyether polyol dehydration

[0035] In a dry and clean 500mL three-necked flask equipped with a stirrer and a thermometer, add 50g each of PBA2000 and KGF2000, and dehydrate at 110°C and 0.08MPa vacuum for 2h;

[0036] Step b, prepolymerization reaction

[0037] cool down to 70 o C, in the flask, slowly add 33.5g MDI, 1 drop of dibutyltin dilaurate, measure the content of -NCO group in the prepolymer after reacting 2h, until close to theoretical value;

[0038] Step c, make polyurethane prepolymer

[0039] Dissolve 8gDMPA in 8gNMP and add it to the flask to continue the reaction for 2h until the NCO content is close to the theoretical value. During this period, if the viscosity is too high, add acetone to reduce t...

Embodiment 2

[0045] Weigh the following raw materials:

[0046] PBA2000 50g

[0047] KGF2000 50g

[0048] MDI 33.5g

[0049] DMPA 8g

[0050] NMP 8g

[0051] Triethylamine 3.7g

[0052] Nano montmorillonite 1g

[0053] Diethylamine 0.1g.

[0054] Step a, polyester, polyether polyol dehydration

[0055] In a dry and clean 500mL three-necked flask equipped with a stirrer and a thermometer, add 50g each of PBA2000 and KGF2000, and dehydrate at 110°C and 0.08MPa vacuum for 2h;

[0056] Step b, prepolymerization reaction

[0057] cool down to 70 o C, in the flask, slowly add 33.5g MDI, 1 drop of dibutyltin dilaurate, measure the content of -NCO group in the prepolymer after reacting 2h, until close to theoretical value;

[0058] Step c, make polyurethane prepolymer

[0059] Dissolve 8gDMPA in 8gNMP and add it to the flask to continue the reaction for 2h until the NCO content is close to the theoretical value. During this period, if the viscosity is too high, add acetone to reduce the...

Embodiment 3

[0065] Weigh the following raw materials:

[0066] PBA2000 40g

[0067] KGF2000 60g

[0068] MDI 25g

[0069] DMPA 6g

[0070] NMP 6g

[0071] Triethylamine 3.7g

[0072] Nano-montmorillonite 1.3g

[0073] Diethylamine 0.1g.

[0074] Step a, polyester, polyether polyol dehydration

[0075] In a dry and clean 500mL three-neck flask equipped with a stirrer and a thermometer, add PBA2000, 40g and KGF2000, 60g, dehydrate at 110°C, 0.08MPa vacuum for 2h;

[0076] Step b, prepolymerization reaction

[0077] cool down to 70 o C, in the flask, slowly add 25g MDI, 1 drop of dibutyltin dilaurate, measure the content of -NCO group in the prepolymer after reacting 2h, until close to theoretical value;

[0078] Step c, make polyurethane prepolymer

[0079] Dissolve 6gDMPA in 6gNMP and add it into the flask to continue the reaction for 2h until the NCO content is close to the theoretical value. During this period, if the viscosity is too high, add acetone to reduce the viscosity; ...

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Abstract

The invention provides a nano modified polyurethane adhesive which comprises the following components in parts by weight: 10-40 parts of polyester polyol, 10-60 parts of polyether polyol, 15-30 parts of isocyanate, 3-8 parts of dimethylolpropionic acid, 0.5-1.5 parts of N-methyl pyrrolidone, 2-4 parts of triethylamine, 0.3-1 part of nano-montmorillonite and 0.05-0.15 part of amine chain extender. The invention also provides a preparation method of the nano modified polyurethane adhesive. The prepared nano modified polyurethane emulsion is good in storage stability, high in solid content, high in adhesion strength and excellent in chemical property; and moreover, the method for preparing the nano modified polyurethane emulsion is simple in process, relatively low in cost, low-carbon and environment-friendly, smell is small, organic volatile matter content is small, no acetone is removed.

Description

technical field [0001] The invention relates to a polyurethane adhesive, in particular to a nano-modified polyurethane adhesive. Background technique [0002] Polyurethane (PU) is a high-performance polymer synthetic material, which has been widely used in the fields of foam plastics, elastomers, adhesives and coatings. Polyurethane adhesives have excellent bonding properties, good flexibility, impact resistance, solvent resistance, abrasion resistance, flexibility and low temperature resistance, and are widely used in composite films, shoes, leather, fabrics, etc. , automobiles, timber, civil engineering and other industrial sectors and civil fields. At present, most polyurethane adhesives are solvent-based, and the solvents are generally volatile organic solvents such as acetone, butanone, toluene, ethyl acetate, and dimethylformamide. These solvents are toxic, flammable, explosive, and volatile. During production and use, they not only pollute the environment, have low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C09J11/04C08G18/76C08G18/66C08G18/12
Inventor 朱琳李超群
Owner 苏州井上高分子新材料有限公司
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