Method for preparing fire retardant modification timber

A modification and flame retardant technology, applied in wood treatment, impregnated wood, manufacturing tools, etc., can solve the problems of flammability of modified wood and easy loss of flame retardants, and achieve flame retardant performance, good water solubility, The effect of improving physical and mechanical properties

Inactive Publication Date: 2009-12-16
EVERFIRST WISEFUND TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problem that the flame retardant is easily lost inside the wood, resulting in the flammability of the modified wood, and to provide a new preparation method of the flame retardant modified wood, which can be processed by one-time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] 1. Preparation of flame retardant (in parts by weight): Mix 102 parts of phosphoric acid, 62 parts of urea and 87 parts of water, and stir evenly to obtain; 2. Preparation of urea-formaldehyde resin pre-shrinkage solution (in parts by weight) :Mix 560 parts of formaldehyde, 170 parts of urea, 15 parts of melamine and 700 parts of water, and stir evenly to obtain; 3. Add 20 parts by weight of flame retardant to 80 parts by weight of urea-formaldehyde resin pre-shrinking solution and dissolve completely Obtain the impregnation solution; 4. The impregnation treatment of paulownia: vacuum to -0.085Mpa, hold for 15min, use 1.0Mpa in the pressurization stage, hold for 30min; 5. Drying treatment: drying by gradient heating method: drying at 80℃ 4h, dry at 103°C for 5h, and dry at 120°C for 1h.

[0022] The flame-retardant modified paulownia prepared in this embodiment has a final weight gain rate of 40%, an oxygen index increased by 70%, dimensional stability in...

Example Embodiment

[0023] Example 2

[0024] The only difference between this embodiment and Example 1 is that the weight parts of each component of the flame retardant are as follows: 51 parts of phosphoric acid, 56 parts of melamine, and 150 parts of water; other steps and parameters are exactly the same as those of Example 1.

[0025] The flame-retardant modified paulownia prepared in this example has a final weight gain rate of 35%, oxygen index increased by 40%, dimensional stability increased by 13%, surface hardness increased by 85%, and water absorption rate decreased by 65%.

Example Embodiment

[0026] Example 3

[0027] The only difference between this example and Example 1 is that the weight parts of the flame retardant components are as follows: 118 parts of phosphoric acid, 107 parts of urea, 15 parts of diammonium phosphate and 35 parts of water; other steps and parameters and examples 1 is exactly the same.

[0028] The flame-retardant modified paulownia prepared in this embodiment has a final weight gain rate of 40%, an oxygen index increased by 75%, dimensional stability increased by 15%, surface hardness increased by 90%, and water absorption rate decreased by 90%.

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PUM

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Abstract

The invention discloses a method for preparing a fire retardant modification timber. The method comprises the following steps of: (1) adding a fire retardant into a urea formaldehyde resin concentrate to obtain a timber impregnation liquid after the fire retardant is completely dissolved; (2) making the impregnation treatment of the timber to be treated by using the vacuum pressure method and the timber impregnation liquid obtained in the step (1); and (3) drying the timber to be treated to obtain the fire retardant modification timber. In the method, the fire retardant is directly added into the urea formaldehyde resin concentrate to form the impregnation liquid, so that by one-time impregnation treatment, the use performance of the timber is improved, the fire retardant effect is enhanced, the process for modifying the timber is simplified, and other steps which are needed after the timber modification to realize the fire retardant function are saved. The method has the advantages of simple process and unnecessary complex equipment; and when the method is adopted to treat the timber, the size stability of the treated timber is obviously improved, the physical and mechanical properties are obviously improved, the weight gain rate of the timber is between 25 and 50 percent, and the oxygen index is increased by 40 to 80 percent.

Description

technical field [0001] The invention relates to a method for modifying wood, in particular to a method for preparing flame-retardant modified wood, and belongs to the field of chemical modification of wood. Background technique [0002] Wood is closely related to people's daily life. Chemical modification of wood is an effective way to improve the natural defects of plantation wood and low-grade wood. The density, surface hardness, wear resistance and dimensional stability of wood after treatment are greatly improved. At present, my country has extensively carried out research on the strengthening technology of fast-growing wood. [0003] As people's requirements for wood quality are getting higher and more comprehensive, multi-functional wood modification technology is also the main direction of wood modification development, not only to improve material properties, but also to make wood have anti-corrosion properties and flame retardant properties. Environmental protectio...

Claims

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Application Information

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IPC IPC(8): B27K3/00B27K3/52B27K3/08B27K5/04
Inventor 雷得定周军浩邓雄飞
Owner EVERFIRST WISEFUND TECH BEIJING
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