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Sodium lignosulfonate-melamine-formaldehyde copolymer resin wood adhesive and preparation method thereof

A technology of sodium lignosulfonate and formaldehyde copolymerized resin, which is applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of unreachable and low cost performance, and achieve low cost, The effect of simple process and stable resin performance

Inactive Publication Date: 2019-03-08
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bornstei (BORNSTEIN LEOPOLD F. Lignin-based composition board binder comprising a copolymer of a lignosulfonate, melamine and an aldehyde [P].: US4130515, 1978-12-19.) adopts lignosulfonate and melamine formaldehyde copolymerization to prepare the adhesive, 2.65% methanol is added to the resin synthesis to maintain the storage stability of the resin, and the bonding performance is only equivalent to that of urea-formaldehyde resin, which does not meet the national "I" type plywood standard, and the cost performance is not high

Method used

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  • Sodium lignosulfonate-melamine-formaldehyde copolymer resin wood adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw material ratio: the mass ratio of sodium lignosulfonate to melamine is 0.1:1, the molar ratio of formaldehyde to melamine is 2.0:1, and the solid content of the resin is 56.50%.

[0018] Preparation:

[0019] (1) Add 12.6 parts by weight of sodium lignosulfonate in a four-necked flask, add 200.2 parts by weight of formaldehyde solution with a mass fraction of 30% under stirring, and use an alkali solution (sodium hydroxide solution with a mass concentration of 30%, the same below) Adjust the pH value to 9.0-9.5;

[0020] (2) Add 126.1 parts by weight of melamine under stirring, heat up to 80°C (heating rate is 1°C / 2min), adjust the pH value with alkaline solution to not less than 8.5, and keep warm for 30 minutes;

[0021] (3) Heat up to 88°C (heating rate is 1°C / 2min), keep warm for 40 minutes, cool to 30°C, start measuring the viscosity to 55.5-114.5mPa·s, adjust the pH value to 9.0-9.5 with alkaline solution After cooling and discharging, sodium lignosulfonate-...

Embodiment 2

[0024] Raw material ratio: the mass ratio of sodium lignosulfonate to melamine is 0.2:1, the molar ratio of formaldehyde to melamine is 2.2:1, and the solid content of the resin is 57.13%.

[0025] Preparation:

[0026] (1) Add 25.2 parts by weight of sodium lignosulfonate in a four-necked flask, add 220.2 parts by weight of formaldehyde solution with a mass fraction of 30% under stirring, and use an alkali solution (sodium hydroxide solution with a mass concentration of 30%, the same below) Adjust the pH value to 9.0-9.5;

[0027] (2) Add 126.1 parts by weight of melamine under stirring, heat up to 80°C (heating rate is 1°C / 2min), adjust the pH value with alkaline solution to not less than 8.5, and keep warm for 30 minutes;

[0028] (3) Heat up to 88°C (heating rate is 1°C / 2min), keep warm for 40 minutes, cool to 30°C, start measuring the viscosity to 55.5-114.5mPa·s, adjust the pH value to 9.0-9.5 with alkaline solution After cooling and discharging, sodium lignosulfonate-...

Embodiment 3

[0031] Raw material ratio: the mass ratio of sodium lignosulfonate to melamine is 0.3:1, the molar ratio of formaldehyde to melamine is 2.2:1, and the solid content of the resin is 58.06%.

[0032] Preparation:

[0033] (1) Add 37.8 parts by weight of sodium lignosulfonate in a four-necked flask, add 220.2 parts by weight of formaldehyde solution with a mass fraction of 30% under stirring, and use an alkali solution (sodium hydroxide solution with a mass concentration of 30%, the same below) Adjust the pH value to 9.0-9.5;

[0034] (2) Add 126.1 parts by weight of melamine under stirring, heat up to 80°C (heating rate is 1°C / 2min), adjust the pH value with alkaline solution to not less than 8.5, and keep warm for 30 minutes;

[0035] (3) Heat up to 88°C (heating rate is 1°C / 2min), keep warm for 40 minutes, cool to 30°C, start measuring the viscosity to 55.5-114.5mPa·s, adjust the pH value to 9.0-9.5 with alkaline solution After cooling and discharging, sodium lignosulfonate-...

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Abstract

The invention discloses a sodium lignosulfonate-melamine-formaldehyde copolymer resin wood adhesive and a preparation method thereof. The method includes taking sodium lignosulfonate, melamine and formaldehyde as raw materials, adding an alkali solution as a catalyst, and preparing the sodium lignosulfonate-melamine-formaldehyde copolymer resin wood adhesive (SLMF) through a copolymerization reaction. The preparation process of the method is simple, no harmful reagents such as methanol and the like are added, and compared with the traditional MF resin, the obtained wood adhesive product has lower cost, longer storage period and more stable resin performance; and meanwhile, the cheap renewable raw material of the sodium lignosulfonate is used to replace the melamine in the production of theadhesives for a wood industry, and thus the cost of adhesives is reduced, and environmental protection is beneficial. The adhesive can replace the MF resin wood adhesive which is widely used at present, and is applied to related production processes of artificial boards, and the produced plywood reaches the national standard class 'I' of the plywood .

Description

technical field [0001] The invention belongs to the technical field of wood adhesives in the production of wood-based panels, and in particular relates to a sodium lignosulfonate-melamine-formaldehyde copolymer resin wood adhesive and a preparation method thereof. Background technique [0002] Sodium lignosulfonate is the reaction product of wood pulp, sulfur dichloride aqueous solution and sulfite, and is a by-product of pulp production. At present, the application of sodium lignosulfonate mainly includes: dye dispersant, cement water reducer; Yin Weiming et al. (Preparation and characterization of sodium lignosulfonate / melamine formaldehyde microsphere foam [J / OL]. 1-7 [2018-07-09]) Using sodium lignosulfonate, melamine, and formaldehyde as raw materials, the microsphere foam was prepared by co-condensation under alkaline conditions. Nevertheless, the utilization rate of sodium lignosulfonate is still very low, causing a lot of environmental pollution and waste of resourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C08G12/40C08G12/32B27D1/04
CPCB27D1/04C08G12/32C08G12/40C09J161/32
Inventor 王凯伦甘卫星刘雪纯张晨晨陈绪高
Owner GUANGXI UNIV