Preparation method and application in wood processing of water-based polyurethane adhesive

A water-based polyurethane and adhesive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of high solvent content and poor water resistance, and achieve reduced system viscosity, strong adaptability, and excellent performance Effect

Inactive Publication Date: 2010-05-05
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The water-based polyurethane emulsion synthesized by this method has poor wate...

Method used

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  • Preparation method and application in wood processing of water-based polyurethane adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 21.85g of polyadipate-1,4-butylene glycol ester diol (PBA-2000) and 1.6g of DMPA into a three-necked flask, mix and stir after melting, vacuumize and dehydrate at 90°C for 1 hour, and the vacuum degree is 0.095MPa . Then cool down to 80°C and add 1.9g NMP (1-methyl-2-pyrrolidone), 0.76g HEA (hydroxyethyl acrylate), 7.25g MDI and catalyst: di-n-butyltin dilaurate, 0.1g, and heat the reaction until the system When the NCO value basically reaches the theoretical value, the prepolymer is obtained, and the temperature begins to drop. Cool the prepolymer to 60°C, dilute it with an appropriate amount of acetone, and after the viscosity decreases, add 1.2g triethylamine dropwise for shear emulsification and neutralization for 30 minutes to form a salt, after the phase transition is basically completed. 58.9 g of water was added under high-speed stirring, and then 0.048 g of chain extender ethylenediamine was slowly added dropwise for further chain extension and emulsificat...

Embodiment 2

[0026] Under the operation condition of embodiment 1, add 2g castor oil (C.O.) in addition, change MDI into TDI, its NCO / OH ratio (R) is 1.4, obtains yellowish emulsion (theoretical solid content is 42%).

Embodiment 3

[0028]Under the operating conditions of Example 1, MDI was replaced by IPDI, the R value was 1.2, and a slightly blue translucent emulsion (theoretical solid content was 50%) was obtained.

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PUM

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Abstract

The invention relates to a water-based polyurethane adhesive, in particular to a preparation method of a water-based polyurethane adhesive used in the wood processing. The preparation method comprises three stages, wherein the first stage is stepwise polymerization, namely polyol oligomer, hydrophilic monomer, isocyanate and modified monomer are adopted to prepare modified polyurethane prepolymer through stepwise polymerization and radical polymerization; the second stage is to disperse the modified polyurethane prepolymer in water after neutralization and salt formation; the third stage is to add chain extender to form water-based polyurethane emulsion, wherein the R value of the modified polyurethane prepolymer is 1.02-2.0 and R value refers to the ratio of the total mole number of NCO to the total mole number of OH in the system, the synthesis conditions are as follows: the vacuum degree is 0.090-0.1MPa, the polymerization temperature is 65-90 DEG C, the polymerization reaction time is 2-4h, the neutralization temperature is 40-60 DEG C and the solid content is 20-50%. The preparation method of the invention adopts proper amount of modified monomer to graft and crosslink with polyurethane so as to obviously increase the water resistance, solvent resistance and bonding strength, thus optimizing the product performance.

Description

technical field [0001] The invention relates to a water-based polyurethane adhesive, in particular to a preparation method of the water-based polyurethane adhesive used in wood processing. Background technique [0002] Adhesives used in wood processing in my country are mainly in the two fields of wood-based panel manufacturing and wood product production. "Trialdehyde resin" glue, polyvinyl acetate glue and acrylate resin emulsion glue are still the main ones, among which aldehyde adhesives - urea-formaldehyde resin glue, phenolic resin glue and melamine-formaldehyde resin glue are the three most widely used in the wood-based panel industry. Great synthetic rubber. The market share of "trialdehyde resin" glue is as high as more than 40%, but "trialdehyde resin" glue will produce pungent odor and toxic formaldehyde during use, causing pollution to the environment. The water resistance, heat resistance and bonding performance of polyvinyl acetate resin glue are all relative...

Claims

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Application Information

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IPC IPC(8): C09J175/04C08G18/83C08G18/72C08G18/10C08G18/32
Inventor 杜郢高山代飞罗贺
Owner JIANGSU POLYTECHNIC UNIVERSITY
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