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Method for preparing strengthened poplar composite material

A technology of composite materials and poplar wood, which is applied in the field of preparation of reinforced poplar wood composite materials, can solve the problems of low resin conversion rate and low resin impregnation amount, and achieve the effect of increasing conversion rate, increasing added value and reducing release amount

Inactive Publication Date: 2012-06-13
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of low resin impregnation and low resin conversion rate existing in the preparation process of reinforced poplar wood composite material, and provides a preparation method of reinforced poplar wood composite material

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0015] Specific Embodiment 1: The preparation method of reinforced poplar wood composite material in this embodiment is carried out according to the following steps: 1. Mix water-based polymer isocyanate and modified milky white glue at room temperature, stir and mix to obtain an adhesive; 2. Apply the adhesive obtained in step 1 evenly on the surface of the reinforced poplar veneer, and the amount of glue applied is 60-140g / m 2 , and then lay the core material, apply a layer of adhesive evenly to the surface of another reinforced poplar veneer, and then cover the core material, the amount of glue applied is 60-140g / m 2 , with the glued side facing down, contacting with the core material to obtain a slab; 3. Put the slab into a hot press for hot pressing. The hot pressing temperature is 50-80°C, the pressure is 2-5MPa, and the hot-pressing time is 10- 20min, cooling and aging after the hot pressing is finished, the reinforced poplar wood composite material is obtained; the mas...

specific Embodiment approach 2

[0018] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the preparation method of reinforced poplar veneer in the step 2 is: a, styrene, methyl methacrylate methyl and vinyl acetate Mix 1:2:1 to form a mixed resin liquid, add azobisisobutyronitrile, cobalt naphthenate and zinc chloride to the mixed resin liquid to obtain a mixed liquid; b, under the condition of a pressure of 0.2 to 0.5 MPa, Immerse the poplar veneer in the mixture prepared in step a for 30-60 minutes, then take it out and place it for 36 hours, then polymerize the poplar veneer at 60-90°C for 3-7 hours to obtain strengthened poplar veneer plate; wherein in step a, azobisisobutyronitrile is 1% to 4% of the quality of the mixed resin liquid, cobalt naphthenate is 0.5% to 2% of the quality of the mixed resin liquid, and zinc chloride is 2% of the quality of the mixed resin liquid. %~4%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the amount of glue applied in step two is 80 ~ 120g / m 2 . Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for preparing a strengthened poplar composite material. By the method, the problems of small dipping amount and low conversion rate of resin in the conventional process for preparing the strengthened poplar composite material are solved. The method comprises the following steps of: mixing water-based macromolecular isocyanate and a modified white emulsion adhesive to obtain an adhesive; coating the adhesive on the surface of one strengthened poplar veneer, paving a core material, coating a layer of adhesive on the surface of the other strengthened poplar veneer, and covering the strengthened poplar veneer on the core material to obtain a slab; and putting the slab into a hot-pressing machine for hot pressing, cooling and aging to obtain the strengthened poplar composite material. By the method, the dipping amount and the conversion rate of the resin can be improved, and the surface hardness, abrasive resistance and static bending strength of the composite material can be improved; and the method is widely applied to fields of buildings, furniture, interior decoration and the like.

Description

technical field [0001] The invention relates to a preparation method of reinforced poplar wood composite material. Background technique [0002] With the development of my country's economy, the contradiction between supply and demand of wood and its products has become increasingly acute. Only by vigorously creating high-quality and efficient fast-growing and high-yielding forests and improving the effective supply capacity of timber can we fundamentally solve the contradiction between the serious imbalance between supply and demand of timber in our country. my country started the construction project of fast-growing and high-yielding timber forests in 2001, and currently it can provide 22.5 million m3 of timber per year 3 . It is planned that by 2015, 130 million m3 of timber can be produced from fast-growing and high-yield forests every year 3 about. It can be foreseen that my country's fast-growing and high-yield plantation forests will have an unprecedented developm...

Claims

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Application Information

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IPC IPC(8): B27D1/08B32B21/04B32B21/14B32B27/04B32B37/12B32B37/06B32B37/10B32B38/08
Inventor 孙建平王逢瑚陈广胜马立军
Owner NORTHEAST FORESTRY UNIVERSITY
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