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A kind of preparation method of moist heat curing type modified melamine-urea-formaldehyde resin adhesive

A melamine, urea-formaldehyde resin technology, used in polyurea/polyurethane adhesives, adhesives, aldehyde/ketone condensation polymer adhesives, etc., can solve problems such as physical injury, achieve low cost, improve wetting performance, flexibility good effect

Active Publication Date: 2016-06-08
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Trialdehyde glue" is easy to release irritating and toxic gases (free formaldehyde, etc.) during the bonding process and the use of finished products, which will cause certain physical harm to the environment and users

Method used

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  • A kind of preparation method of moist heat curing type modified melamine-urea-formaldehyde resin adhesive
  • A kind of preparation method of moist heat curing type modified melamine-urea-formaldehyde resin adhesive
  • A kind of preparation method of moist heat curing type modified melamine-urea-formaldehyde resin adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of moisture-heat curing type modified melamine-urea-formaldehyde resin (MUF) adhesive, concrete steps are as follows:

[0036] (1) Take polyoxypropylene glycol (PPG) and add it to the reaction equipment, vacuumize and dehydrate it under the conditions of 110°C and 0.1MPa until the moisture content is 0.02-0.09%. PPG can be selected from polyether 410 or polyether 210;

[0037] (2) Adjust the reaction temperature to 30°C, take polymethylene polyphenyl polyisocyanate (PAPI) and add it to the constant pressure funnel, and evenly add it dropwise to polyoxypropylene glycol (PPG), ensuring that the adding time is 1 hour, After the dropwise addition is completed, the temperature is controlled at 60° C. to obtain a polyurethane prepolymer; the amount of polyoxypropylene diol and polymethylene polyphenyl polyisocyanate satisfies that the R value (-NCO / -OH) is 3 , 4, 5, 6;

[0038] (3) Add the blocking agent to the polyurethane prepolymer obtained in...

Embodiment 2

[0056] A kind of preparation method of moisture-heat curing type modified melamine-urea-formaldehyde resin (MUF) adhesive, concrete steps are as follows:

[0057] (1) Take polyoxypropylene glycol (PPG) and add it to the reaction equipment, vacuumize and dehydrate it at 115°C and 0.15MPa until the moisture content is 0.02-0.09%;

[0058] (2) Adjust the reaction temperature to 60°C, take polymethylene polyphenyl polyisocyanate (PAPI) and add it to the constant pressure funnel, and evenly add it dropwise to polyoxypropylene glycol (PPG), ensuring that the adding time is 1.5 hours, After the dropwise addition, the temperature is controlled at 90°C to obtain a polyurethane prepolymer; the amount of polyoxypropylene diol and polymethylene polyphenyl polyisocyanate satisfies the -NCO / -OH ratio of 3, 4, 5 , 6;

[0059] (3) Add the sealing agent to the polyurethane prepolymer obtained in the above step (2), control the reaction temperature to 80° C., add sodium methoxide to adjust the...

Embodiment 3

[0064] A kind of preparation method of moisture-heat curing type modified melamine-urea-formaldehyde resin (MUF) adhesive, concrete steps are as follows:

[0065] (1) Take polyoxypropylene glycol (PPG) and add it to the reaction equipment, vacuumize and dehydrate it at 112°C and 0.12MPa until the moisture content is 0.02-0.09%;

[0066] (2) Adjust the reaction temperature to 50°C, take polymethylene polyphenyl polyisocyanate (PAPI) and add it to the constant pressure funnel, and evenly add it dropwise to polyoxypropylene glycol (PPG), ensuring that the adding time is 1 hour, After the dropwise addition, the temperature is controlled at 70°C to obtain a polyurethane prepolymer; the amount of polyoxypropylene diol and polymethylene polyphenyl polyisocyanate satisfies the -NCO / -OH ratio of 3, 4, 5 , 6;

[0067] (3) Add the sealing agent to the polyurethane prepolymer obtained in the above step (2), control the reaction temperature to 60° C., add sodium methoxide to adjust the re...

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Abstract

The invention discloses a preparation method of a damp and hot curable modified melamine-urea formaldehyde resin (MUF) adhesive, wherein the preparation method comprises the following specific steps: taking PPG, adding into a device, vacuumizing, and dehydrating until the moisture content is 0.02-0.09%; adjusting the temperature to 30-60 DEG C, taking PAPI, adding into a funnel, uniformly dropwise adding into the PPG, controlling the temperature at 60-90 DEG C, and thus obtaining a polyurethane prepolymer; allowing the amount of the PPG and the amount of the PAPI to meet the -NCO / -OH ratio of 3, 4, 5 and 6; adding a blocking agent into the polyurethane prepolymer, controlling the reaction temperature at 50-80 DEG C, discharging to obtain a blocked polyurethane prepolymer; and co-blending the blocked polyurethane prepolymer with MUF at the room temperature, and thus obtaining the damp and hot curable modified MUF adhesive. The damp and hot curable modified MUF adhesive provided by the invention improves the wettability and the bonding strength of a resin adhesive, is low in cost, and has no pollution to the environment.

Description

technical field [0001] The invention relates to the field of wood adhesives, in particular to a method for preparing a moisture-heat-curing modified melamine-urea-formaldehyde resin adhesive. Background technique [0002] Adhesives are essential raw materials in the wood-based panel industry, among which plywood, particle board, fiberboard, etc. are all processed and manufactured with adhesives. "Trialdehyde glue" is easy to release irritating and toxic gases (free formaldehyde, etc.) during the bonding process and the use of finished products, which will cause certain physical harm to the environment and users. As the voice of environmentally friendly public opinion becomes more and more prominent, some developed countries have successively formulated relevant regulations to restrict the use of adhesives that produce toxic gases; combined with the use and environmental requirements, the existing wood adhesives have been modified to develop low-toxicity and environment-frien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/30C09J175/08C08G18/83C08G18/76C08G18/48C08G18/10
Inventor 卢晓宁蒋军崔举庆那斌王志强韩书广任少波
Owner NANJING FORESTRY UNIV