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Polyurethane urea dispersoid, adhesive composition and application thereof in preparation of zero-aldehyde-added ultrathin high-density fiberboard

A polyurethane urea and dispersion technology, which is applied in the field of ultra-thin and high-density fiberboard with zero aldehyde addition, can solve the problems of easy corruption, obstacles to batch production, and low strength of biomass adhesives, so as to increase the active hydrogen content and improve the initial strength. Viscosity and solubility enhancement effects

Active Publication Date: 2020-11-20
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In CN109605535A, 1.5mm ultra-thin high-density fiberboard is produced by using formaldehyde-free tannin, lignin and starch adhesives, but the traditional biomass adhesives have low strength and are easily corrupted, so there are technical obstacles in batch production
The pre-pressed slab will also break due to lack of initial strength at the slab transmission interface, and once it breaks, it will cause the accumulation of fibers at the steam injection port or the inlet of the hot press, and then the shutdown will affect production
In addition, due to the faster transmission speed, the resistance at the interface will be amplified, which will generate a greater impact on the slab, which has a higher requirement for the compactness of the fiber. Conventional isocyanate glue sizing fibers are bound to It is difficult to pass this interface

Method used

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  • Polyurethane urea dispersoid, adhesive composition and application thereof in preparation of zero-aldehyde-added ultrathin high-density fiberboard
  • Polyurethane urea dispersoid, adhesive composition and application thereof in preparation of zero-aldehyde-added ultrathin high-density fiberboard
  • Polyurethane urea dispersoid, adhesive composition and application thereof in preparation of zero-aldehyde-added ultrathin high-density fiberboard

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In a 50L reactor equipped with a stirrer, a thermometer, and a condenser, put 50 parts by mass of polyurea polyol I, 19.3 parts by mass of isocyanate II, 20 parts by mass of polyester polyol I through dehydration, and 2.37 parts by mass. Parts by mass of diethanolamine and 0.1 part by mass of bismuth neodecanoate were stirred at 80-90° C. until the NCO reached 0.72%. The resulting prepolymer was dissolved in 100 parts by mass of acetone and cooled to 48°C. Add 8.33 parts by mass of N-(2-aminoethyl)-2-aminoethanesulfonate sodium and 100 parts by mass of water to the acetone solution in which the prepolymer is dissolved and stir for 20 minutes to fully disperse, and use triethylamine to dissolve the water dispersion The pH was adjusted to 8. After high-speed emulsification and separation of acetone by distillation under reduced pressure, an aqueous dispersion of polyurethane urea was obtained, which had a solid content of 50 wt%.

[0077] The combination materials used ...

Embodiment 2

[0081] In a 50L reactor equipped with a stirrer, a thermometer, and a condenser, put 43 parts by mass of polyurea polyol II through dehydration treatment, 27.3 parts by mass of isocyanate I, 22 parts by mass of polyester polyol II through dehydration treatment, 1.84 Parts by mass of N-methyl-n-propylamine and 0.15 parts by mass of bismuth neodecanoate were stirred at 80-90° C. until the NCO reached 0.53%. The resulting prepolymer was dissolved in 100 parts by mass of acetone and cooled to 48°C. Add 5.86 parts by mass of N-(3-aminopropyl)-3-aminopropanesulfonate sodium and 100 parts by mass of water to the acetone solution in which the prepolymer is dissolved, and stir vigorously for 20 minutes to fully disperse, and use triethylamine to dissolve the water The pH of the dispersion was adjusted to 7.8. After high-speed emulsification and separation of acetone by distillation under reduced pressure, an aqueous dispersion of polyurethane urea was obtained, which had a solid conte...

Embodiment 3

[0086]In a 50L reactor equipped with a stirrer, a thermometer, and a condenser, put 39 parts by mass of polyurea polyol III through dehydration treatment, 19.45 parts by mass of isocyanate I, 30 parts by mass of polyester polyol I through dehydration treatment, 8.6 In parts by mass of diethanolamine, 0.08 parts by mass of bismuth neodecanoate was stirred at 80-90° C. until the NCO reached 0.68%. The resulting prepolymer was dissolved in 100 parts by mass of acetone and cooled to 48°C. 2.95 parts by mass of sodium N-(2-aminoethyl)-2-aminoethanesulfonate and 100 parts by mass of water were added to the acetone solution in which the prepolymer was dissolved while vigorously stirring. Stir for 20 minutes to fully disperse, emulsify at high speed, and distill under reduced pressure to separate acetone to obtain an aqueous dispersion of polyurethane urea, which has a solid content of 50 wt%.

[0087] The combination materials used for ultra-thin high-density fiberboard with zero al...

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Abstract

The invention discloses an adhesive composition. The adhesive composition comprises polyisocyanate and a polyurethane urea dispersoid, wherein on the basis of the solid mass of the adhesive composition, the polyisocyanate accounts for 95-99.5%, and preparation raw materials of the polyurethane urea dispersoid comprises (a) at least one polyurea polyol with the number-average molecular weight Mn greater than or equal to 500 g / mol but smaller than or equal to 3000 g / mol and the hydroxyl functionality greater than or equal to 1.5 but smaller than or equal to 4, and one or more hydrophilic compounds containing ionic groups, potentially ionic groups and non-ionic groups; (b) at least one polyester polyol; (c) at least one isocyanate; (d) hydrophilic compounds containing one or more of ionic groups and potentially ionic groups and contains 2-3 NCO reactive functional groups; and (e) an optional blocking agent for isocyanate groups.

Description

technical field [0001] The invention belongs to the field of wood-based panel manufacturing, and relates to a polyurethane urea dispersion and an adhesive composition prepared therefrom, and the adhesive composition is applied to the preparation of fiberboards, especially zero-aldehyde-added, ultra-thin and high-density fiberboards . Background technique [0002] Since the production of ultra-thin high-density fiberboard with urea-formaldehyde resin as adhesive, it has won praise from the market, expanding and extending the use of medium / high-density fiberboard, mainly used for gift packaging, modeling furniture, circuit control panels, and automotive interior splints Wait. [0003] CN110154198A uses sodium hexafluorophosphate and other special cooking aids to improve the mechanical properties of the fibers obtained by thermal grinding, enhance the strength of the chemical bonds of fiber macromolecules, make it less prone to chain scission, and at the same time improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/04B27N3/00C08G18/50C08G18/42C08G18/44
CPCB27N3/04B27N3/002C08G18/5042C08G18/4277C08G18/44C08G18/4238C08G18/4018C08G18/5072
Inventor 王向硕涂松胡兵波
Owner WANHUA CHEM GRP CO LTD
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