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Sucrose-melamine-formaldehyde (SMF) copolycondensation resin wood adhesive and preparation method thereof

A technology of co-polycondensation resin and wood adhesive, applied in the direction of adhesive, aldehyde/ketone condensation polymer adhesive, adhesive type, etc., can solve the problem of severe reaction of industrial sucrose modified MF, short storage period of resin, difficult to control, etc. problem, to achieve the effect of low cost, long shelf life and similar performance

Active Publication Date: 2013-04-24
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction of industrial sucrose modified MF in this study is violent and difficult to control, and the storage period of the resin is still relatively short, only 7-9 days

Method used

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  • Sucrose-melamine-formaldehyde (SMF) copolycondensation resin wood adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] (1) Get 220 parts by weight of formaldehyde solution with a mass fraction of 37%, adjust the pH to 8.5 with sodium hydroxide solution, add 0.25% borax as a crosslinking agent under stirring, add 126 parts by weight of melamine, 137 parts by weight after reacting for 5 minutes Parts of sucrose, gradually warming up to 88 ~ 96 ℃;

[0012] (2) After insulated reaction at this temperature for 30 minutes, add water to dilute the solid content of the resin to 46-48% when the water dilution of the reaction solution reaches 2 times, adjust the pH to 8.5 with sodium hydroxide solution, and then cool and discharge the material to obtain final product Sucrose-melamine-formaldehyde polycondensation resin wood adhesive.

[0013] In the preparation of this example, the molar ratio of sucrose to melamine was 0.4:1; the obtained adhesive was a golden yellow liquid with a solid content of 46-48%, a pH of 8.5, and a storage period of 30-60 days.

Embodiment 2

[0015] (1) Get 220 parts by weight of formaldehyde solution with a mass fraction of 37%, adjust the pH to 8.5 with sodium hydroxide solution, add 0.30% borax as a crosslinking agent under stirring, add 126 parts by weight of melamine, 188 parts by weight of melamine after 10 minutes of reaction Parts of sucrose, gradually warming up to 90-98°C;

[0016] (2) After insulated reaction at this temperature for 30 minutes, add water to dilute the solid content of the resin to 47-49% when the water dilution of the reaction solution reaches 2.5 times, adjust the pH to 8.5 with sodium hydroxide solution and then cool the material to obtain final product Sucrose-melamine-formaldehyde polycondensation resin wood adhesive.

[0017] In the preparation of this example, the molar ratio of sucrose to melamine is 0.55:1; the obtained adhesive is a light yellow liquid with a solid content of 47-49%, a pH of 8.5, and a storage period of 30-50 days.

Embodiment 3

[0019] (1) Get 220 parts by weight of formaldehyde solution with a mass fraction of 37%, adjust the pH to 9.0 with sodium hydroxide solution, add 0.33% borax as a crosslinking agent under stirring, add 126 parts by weight of melamine, 240 parts by weight of melamine after 15 minutes of reaction Parts of sucrose, gradually warming up to 90-98°C;

[0020] (2) After insulated reaction at this temperature for 30 minutes, add water to dilute the solid content of the resin to 48-50% when the water dilution of the reaction solution reaches 3 times, adjust the pH to 9.0 with sodium hydroxide solution, and then cool and discharge the material to obtain final product Sucrose-melamine-formaldehyde polycondensation resin wood adhesive.

[0021] In the preparation of this example, the molar ratio of sucrose to melamine was 0.7:1; the obtained adhesive was a golden yellow liquid with a solid content of 48-50%, a pH of 9.0, and a storage period of 30-40 days.

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Abstract

The invention discloses a sucrose-melamine-formaldehyde (SMF) copolycondensation resin wood adhesive and a preparation method thereof. The adhesive is mainly obtained by performing copolycondensation on sucrose, melamine and formaldehyde, wherein the molar ratio of the sucrose to the melamine is (0.4-0.7):1; the adhesive is yellowish or golden brown liquid with the solid content between 46 percent and 50 percent, the pH between 8.5 and 9.0 and the shelf life between 30 and 60 days. The adhesive is obtained by modifying melamine-formaldehyde (MF) resin with sucrose. The adhesive is mainly prepared by introducing the sucrose into a copolymerization system at a high volume through a single medium. By adopting the method, copolycondensation of a sucrose-melamine-formaldehyde ternary system iseffectively realized, the synthesized SMF has similar performance with pure MF, lower cost and longer shelf life, can substitute the current widely applied MF resin wood adhesive and is suitable for the production technology of various artificial boards.

Description

technical field [0001] The invention relates to a modified melamine-formaldehyde resin adhesive, in particular to a sucrose-melamine-formaldehyde polycondensation resin wood adhesive and a preparation method thereof. Background technique [0002] Although the heat resistance and water resistance of melamine-formaldehyde resin (MF) adhesives are higher than those of urea-formaldehyde resin adhesives, they are equivalent to phenolic resin adhesives, and the price is slightly lower than the latter. However, due to the high price of melamine, Thereby the cost of producing melamine-formaldehyde resin adhesive is high, and simultaneously this type of adhesive has defects such as short shelf life, brittle adhesive layer after curing, and easy rupture. Therefore, how to modify MF to reduce production costs, improve physical and chemical properties, and improve its stability has become an urgent problem to be solved in the adhesive industry. [0003] He Naiye et al. (The effect of m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/32C08G12/40C08G12/32
Inventor 甘卫星伍能文
Owner GUANGXI UNIV
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