Formaldehyde-free plywood and fabrication method thereof

A plywood and formaldehyde technology, applied in chemical instruments and methods, manufacturing tools, wood layered products, etc., can solve problems such as poisoning, achieve good water resistance, excellent physical and mechanical properties, and solve environmental pollution effects

Active Publication Date: 2013-06-12
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the patent of this invention is to provide a method for preparing formaldehyde-free plywood by using waste plastic alloy. recycling to reduce the problem of "white pollution"

Method used

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  • Formaldehyde-free plywood and fabrication method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The present invention utilizes film blowing equipment to prepare high-density polyethylene (HDPE) waste plastic films, and uses them as bonding materials to prepare 5-layer formaldehyde-free birch plywood (thickness 5 mm), using the following steps:

[0054] 1. Recycling high-density polyethylene (HDPE) waste plastics;

[0055] 2. Clean, pulverize and dry recycled high-density polyethylene (HDPE) waste plastics through a circulating water plastic cleaning pulverizer;

[0056] 3. Mix and granulate high-density polyethylene (HDPE) pulverized materials, lubricants, compatibilizers and fillers according to a certain ratio, and the formed plastic alloy particles are then passed through film blowing equipment to prepare a certain format of plastic alloy film.

[0057] 4. The dried birch veneer (thickness 1.2 mm) is repaired and assembled, and formed with plastic alloy film to form a 5-layer birch plywood blank. Plastic alloy films with the same format;

[0058] 5. After the...

Embodiment 2

[0066] A polypropylene (PP) waste plastic film was prepared and used as an adhesive material to prepare 5 layers of formaldehyde-free poplar plywood (thickness 5 mm), the steps were the same as in Example 1.

[0067] Among them, waste plastics are mixed: the lubricant is polyvinylidene fluoride, and the addition amount is 6% of the total amount of plastic; the compatibilizer is maleic anhydride modified polypropylene, and the addition amount is 4%; the filler is light calcium carbonate, The addition amount is 20%.

[0068] The thickness of the alloy is 0.2 mm, and the blown film processing temperature is 170-240°C;

[0069] Hot pressing: the hot pressing temperature is 190°C, the board surface pressure is 2 MPa, and the hot pressing time is 6 minutes.

[0070] Cold pressing: the cold pressing temperature is 20°C, the plate surface pressure is 1.5 MPa, and the cold pressing time is 5 minutes.

Embodiment 3

[0072] Prepare low-density polyethylene (LDPE) waste plastic film, and use it as bonding material to prepare 5 layers of formaldehyde-free poplar plywood (thickness 5 mm), the steps are the same as in Example 1.

[0073] Among them, waste plastics are mixed: the lubricant is polyethylene wax, and the addition amount is 8% of the total amount of plastic; the compatibilizer is hard fatty acid, and the addition amount is 6%; the filler is diatomaceous earth, and the addition amount is 25%.

[0074] The thickness of the alloy is 0.2mm, and the film blowing processing temperature is 150-180°C.

[0075] Hot pressing: the hot pressing temperature is 160°C, the board surface pressure is 2 MPa, and the hot pressing time is 6 minutes.

[0076] Cold pressing: the cold pressing temperature is 20°C, the plate surface pressure is 1.5 MPa, and the cold pressing time is 5 minutes.

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Abstract

A method for fabricating a formaldehyde-free plywood with waste plastic alloy is used for fabricating the novel plywood without free formaldehyde being released by fabricating a plastic alloy film with different waste plastics and taking the plastic alloy film as a bonding material. The method comprises the steps of smashing and cleaning the different waste plastics, allowing the waste plastics to be independent or mixing the waste plastics to a scale, adding relevant packing and assistant, conducting film blowing and calendering to prepare the plastic alloy adhesive film in certain breadth and thickness, conducting crossed assembly with a wood veneer, conducting hot pressing and cold pressing, and obtaining the formaldehyde-free plywood. The fabrication method for the nontoxic and environment-friendly formaldehyde-free plywood with the waste plastics solves the problem that the free formaldehyde released by the ordinary plywood has a toxic action on an environment and a human body, and a recycling approach for the waste plastics is provided.

Description

technical field [0001] The patent of the present invention relates to a formaldehyde-free plywood prepared by using waste plastic alloy and its preparation method, especially a method for preparing formaldehyde-free plywood by using waste plastic alloy film. Background technique [0002] At present, most of the adhesives used in plywood and decorative plywood products on the market are adhesives containing formaldehyde. The products release a large amount of free formaldehyde during production and use, causing indoor air pollution and posing a great threat to the health of producers and consumers. [0003] The Chinese patent "Production method of high-density polyethylene plywood" with application number 200710100722.4 discloses a method of replacing urea-formaldehyde, phenol-formaldehyde and other adhesives with high-density polyethylene, respectively rolling pinholes on the veneer and then forming a billet, and then heating, Production method for pressure-prepared plywood....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/04B32B21/04B27D1/08
CPCB27D1/04B32B37/06B32B37/182B32B37/04B32B2305/70B32B2309/02B32B2309/04B32B2309/12B32B2317/16B29B17/0026Y02W30/62Y10T428/269Y10T428/31902
Inventor 常亮王正郭文静高黎任一萍
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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