Novel process for modifying wood through chemical crosslinking of environment-friendly polyester

A chemical cross-linking and polyester modification technology, which is applied in wood processing equipment, impregnated wood, wood impregnation, etc., can solve the problems of complex synthesis process and non-degradable, etc., and achieve the effect of simple and effective process preparation

Pending Publication Date: 2022-07-01

NORTHEAST FORESTRY UNIVERSITY

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AI-Extracted Technical Summary

Problems solved by technology

The polymer required for this esterification and etherification reaction has the disadvantages that the prepara...

Abstract

The invention discloses a novel process for modifying wood through environment-friendly polyester chemical crosslinking, belongs to the technical field of wood chemical modification, and provides a process for modifying wood through biodegradable elastomer polyester. Organic acid and dihydric alcohol infiltrate wood in a molten state according to the molar ratio of 0.5: 1-1: 3, the two monomers are subjected to a cross-linking reaction under proper conditions, and meanwhile substances in a system and wood hydroxyl are subjected to a chemical reaction and fill wood cell cavities and cell walls. The process method of the environment-friendly polyester chemical crosslinking modified wood comprises the following steps: (1) melting organic acid and dihydric alcohol; (2) synthesis of biodegradable polyester and wood impregnation; and (3) drying the wood. The process method is simple and efficient, and the prepared wood has durability and stability and has extremely high application value.

Application Domain

Wood treatment detailsPressure impregnation +2

Technology Topic

Organic acidOrganic acid (substance) +6

Examples

Experimental program(3)

Example Embodiment

[0025] Example 1

[0026] (1) Pretreatment of wood

[0027] Before dipping, soak the fir with a size of 20mm*20mm*2mm in anhydrous Na2SO 3 Mixed solution with NaOH for 24 hours, then replaced with tert-butanol, and dried in a freeze dryer to a moisture content of less than 12%.

[0028] (2) Melting of organic acid and glycol

[0029] The organic acid and dihydric alcohol were placed in a reaction vessel in a molar ratio of 1:1, and were stirred and melted for 30 min under a high temperature and vacuum condition of 160° C. to obtain a liquid mixture.

[0030] (3) Synthesis of polyester and impregnation of wood

[0031] The liquid mixture in step (2) is completely impregnated with wood, placed in a vacuum oven with a temperature of 110 ° C and a pressure of -0.2 Mpa, and the pressure is -0.1 Mpa every 10 minutes; after pumping twice, the oven is heated to 120 ° C to reach After the temperature, the above-mentioned pumping process was repeated; the oven temperature was raised to 140°C and maintained for 1 hour, and the pumping pressure was -0.1Mpa every 20min.

[0032] (4) Drying of wood

[0033] The wood is taken out from the polyester viscous product in step (3), and dried in a vacuum oven at 140° C. for 5 hours to obtain chemically cross-linked modified wood.

[0034] Table I

[0035] name mass g Density g/cm 3

Example Embodiment

[0036] Embodiment 2

[0037] (1) Pretreatment of wood

[0038] Before dipping, soak the fir with a size of 20mm*20mm*2mm in anhydrous Na2SO 3 Mixed solution with NaOH for 24 hours, then replaced with tert-butanol, and dried in a freeze dryer to a moisture content of less than 12%.

[0039] (2) Melting of organic acid and glycol

[0040] The organic acid and dihydric alcohol were placed in a reaction vessel in a molar ratio of 1:1, and were stirred and melted for 20 min under a high temperature and vacuum condition of 160° C. to obtain a liquid mixture.

[0041] (3) Synthesis of polyester and impregnation of wood

[0042] Completely impregnate the wood with the liquid mixture in step (2), place it in a vacuum oven with a temperature of 120°C and a pressure of -0.2Mpa, and pump down -0.1Mpa every 10min; after three times of pumping, raise the oven temperature to 140°C and keep The temperature is 1h, and the pressure is -0.1Mpa every 20min.

[0043] (4) Drying of wood

[0044] The wood is taken out from the polyester viscous product in step (3), and dried in a vacuum oven at 140° C. for 5 hours to obtain chemically cross-linked wood modified.

[0045] Table II

[0046] name mass g Density g/cm 3

Example Embodiment

[0047] Embodiment 3

[0048] (1) Pretreatment of wood

[0049] Before dipping, soak the fir with the size of 20mm*20mm*2mm in anhydrous Na2SO 3 Mixed solution with NaOH for 24 hours, then replaced with tert-butanol, and dried in a freeze dryer to a moisture content of less than 12%.

[0050] (2) Melting of organic acid and glycol

[0051] The organic acid and the dihydric alcohol were placed in a reaction vessel in a molar ratio of 1:2, and were stirred and melted for 20 min under a high temperature and vacuum condition of 160° C. to obtain a liquid mixture.

[0052] (3) Synthesis of polyester and impregnation of wood

[0053] Completely impregnate the wood with the liquid mixture in step (2), place it in a vacuum oven with a temperature of 130°C and a pressure of -0.2Mpa, and pump down -0.1Mpa every 10min; after pumping twice, raise the oven temperature to 140°C and Keep the temperature for 1h, and pump -0.1Mpa every 20min.

[0054] (4) Drying of wood

[0055] The wood is taken out from the polyester viscous product in step (3), and dried in a vacuum oven at 140° C. for 5 hours to obtain chemically cross-linked wood modified.

[0056] Table 3

[0057] name mass g Density g/cm 3

PUM

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