Urea-formaldehyde resin for non-dewatering particleboard and preparation method thereof

A technology of urea-formaldehyde resin and aqueous solution, which is applied in the direction of aldehyde/ketone condensation polymer adhesive, adhesive type, adhesive, etc., can solve the problems of environmental pollution, emission, and reduce the production cost of particleboard, so as to reduce the production cost and reduce the production cost. Fuel and power consumption, the effect of increasing rubber consumption

Active Publication Date: 2011-06-08
江苏露水河人造板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The urea-formaldehyde resin technology of the present invention can be used in the production of particle boards without dehydration. On the one hand, it solves the problems of waste water discharge and environmental pollution;

Method used

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  • Urea-formaldehyde resin for non-dewatering particleboard and preparation method thereof
  • Urea-formaldehyde resin for non-dewatering particleboard and preparation method thereof
  • Urea-formaldehyde resin for non-dewatering particleboard and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation of embodiment 1 urea-formaldehyde resin 1

[0036] Raw material formula:

[0037]

[0038] Wherein, the components of the bulking agent 1 are: 10 parts by weight of sodium carboxymethyl cellulose, and 90 parts by weight of sodium chloride.

[0039] Extender 1 main technical indicators: density: 1.9-2.1; pH: 7-8; appearance: white powder; moisture: ≤4%.

[0040] The components of additive 1 are: 40 parts by weight of ammonium sulfate, 30 parts by weight of 2-hydroxypropionic acid, and 30 parts by weight of urea.

[0041] Main technical indicators of additive 1: density: 1.1-1.3, pH: 5-7, appearance: white powder, moisture: ≤4%.

[0042] Specific steps are as follows:

[0043] 1) Add 37% formaldehyde aqueous solution to the reaction kettle at one time, add polyvinyl alcohol and extender 1, turn on the steam and heat to 30-40°C, and turn off the steam;

[0044] 2) Use sodium hydroxide aqueous solution to adjust the pH to 8.8, add U1, then open the st...

Embodiment 2

[0057] The preparation of embodiment 2 urea-formaldehyde resin 2

[0058]

[0059] Wherein, the components of the bulking agent 2 are: 50 parts by weight of defatted protein, and 50 parts by weight of silicon dioxide.

[0060] Extender 2 main technical indicators: density: 1.3-1.5; pH: 7-8; appearance: white powder; moisture: ≤4%.

[0061] The components of auxiliary agent 2 are: 30 parts by weight of ammonium phosphate, 30 parts by weight of stearic acid, and 40 parts by weight of sodium dihydrogen phosphate.

[0062] Main technical indicators of additive 2: density: 1.4-1.6, pH: 5-7, appearance: white powder, moisture: ≤4%.

[0063] Concrete steps are with embodiment 1, the quality index of gained urea-formaldehyde resin 2:

[0064] Solid content: 56%;

[0065] pH: 8.0;

[0066] Viscosity (20°C): 180cp;

[0067] Curing time: 60s;

[0068] Free formaldehyde content: <0.1%;

[0069] Storage period: >30 days.

Embodiment 3

[0070] The preparation of embodiment 3 urea-formaldehyde resin 3

[0071]

[0072] Wherein, the components of the extender 3 are: 5 parts by weight of soybean protein isolate, and 95 parts by weight of attapulgite.

[0073] Extender 3 main technical indicators: density: 1.3-1.5; pH: 7-8; appearance: white powder; moisture: ≤4%.

[0074] The components of additive 3 are: 50 parts by weight of ammonium nitrate, 30 parts by weight of o-hydroxybenzoic acid, and 20 parts by weight of urea.

[0075] Main technical indicators of additive 3: density: 1.2-1.4, pH: 3-5, appearance: white powder, moisture: ≤4%.

[0076] Concrete steps are with embodiment 1, the quality index of gained urea-formaldehyde resin 3:

[0077] Solid content: 55%;

[0078] pH: 8.0;

[0079] Viscosity (20°C): 140cp;

[0080] Curing time: 65s;

[0081] Free formaldehyde content: <0.1%;

[0082] Storage period: >30 days.

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Abstract

The invention relates to urea-formaldehyde resin and a preparation method thereof. The urea-formaldehyde resin comprises the following components in parts by weight: 200 parts of formaldehyde solution, 120-170 parts of urea, 0-2 parts of polyvinyl alcohol, 1-10 parts of additive and 3-20 parts of extender, wherein the concentration of formaldehyde solution is 37%; in the preparation process, ureais added three or four times and the reaction is performed in weakly alkaline medium, weakly acidic medium and neutral medium in turn; and additive and extender are added in the synthesis of urea-formaldehyde resin. The urea-formaldehyde resin can be used in the production of the particleboard without being dewatered, thus the problems of wastewater discharge and environmental pollution can be solved and the production cost of the particleboard can be greatly reduced; and the urea-formaldehyde resin is suitable for various large, medium and small particieboard enterprises.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin and a preparation method thereof, in particular to a urea-formaldehyde resin adhesive for non-dehydrating particleboard, belonging to the field of wood-based board adhesives. Background technique [0002] Particleboard is a kind of man-made board made of wood or non-wood plant raw materials, and then pressed after applying adhesive. The adhesive used in its production is urea-formaldehyde resin adhesive. As a kind of wood-based panel, particleboard has an irreplaceable role in the wood-based panel market because of its low price, although its physical and mechanical properties and appearance quality are not as good as those of plywood and fiberboard. According to statistics, the production of particleboard in 2008 reached 11.4243 million cubic meters. Based on this calculation, the urea-formaldehyde glue used for particleboard in 2008 was about 1.26 million tons. Generally speaking, urea-formaldehyde ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/24C08G12/12C09J161/24
Inventor 雷得定刘波王然
Owner 江苏露水河人造板有限公司
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