CN110951183A - Preparation method of wood-plastic composite material - Google Patents

Preparation method of wood-plastic composite material Download PDF

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Publication number
CN110951183A
CN110951183A CN201911068261.6A CN201911068261A CN110951183A CN 110951183 A CN110951183 A CN 110951183A CN 201911068261 A CN201911068261 A CN 201911068261A CN 110951183 A CN110951183 A CN 110951183A
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CN
China
Prior art keywords
wood
parts
powder
wood fiber
reaction
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911068261.6A
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Chinese (zh)
Inventor
杨明
赵悦英
李冲
化明志
王振
梁瑞
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Shandong Xiaguang Group Co ltd
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Shandong Xiaguang Group Co ltd
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Priority to CN201911068261.6A priority Critical patent/CN110951183A/en
Publication of CN110951183A publication Critical patent/CN110951183A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/04Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08L27/06Homopolymers or copolymers of vinyl chloride
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24Acids; Salts thereof
    • C08K3/26Carbonates; Bicarbonates
    • C08K2003/265Calcium, strontium or barium carbonate
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/02Flame or fire retardant/resistant

Abstract

The invention discloses a preparation method of a flame-retardant wood-plastic composite material, which comprises the following steps: performing alkali treatment on wood powder or wood fiber to obtain wood fiber powder, washing the wood fiber powder with water to be neutral, drying the wood fiber powder in a vacuum oven for 12-15h to obtain dry wood fiber powder, pre-dispersing the treated dry wood fiber powder, chloroform and triethylamine at 65 ℃ for 1-2h, slowly dropwise adding POCl3, keeping the reaction condition unchanged, continuously reacting for 8-10h, slowly dropwise adding DDM, continuously reacting for 16-20h after the dropwise adding is finished, washing the reaction product with acetone, washing with deionized water, and drying to obtain flame-retardant modified wood powder or wood fiber, wherein the flame-retardant modified wood powder or wood fiber is prepared by blending 20-40 parts by weight, 35-50 parts by weight of plastic, 20-30 parts by weight of activated calcium carbonate, 5-10 parts by weight of processing aid and 5-10 parts by weight of metal aluminum fiber, and performing extrusion molding. The wood-plastic composite material disclosed by the invention is low in heat release rate and small in smoke yield during combustion, the flame retardant property is remarkably improved, and the preparation method is simple to operate and low in production cost.

Description

Preparation method of wood-plastic composite material
Technical Field
The invention relates to a preparation method of a wood-plastic composite material, in particular to a preparation method of a flame-retardant wood-plastic composite material.
Background
The wood-plastic composite material is a composite material manufactured by taking wood fiber materials and plastics as main raw materials, and is widely applied due to the advantages of excellent water resistance, moisture resistance, zero formaldehyde, insect damage resistance and the like, however, the wood-plastic composite material has the following defects: both the raw materials wood fiber and plastic material are combustible and produce a large amount of smoke when burned. At present, flame retardant is mainly added into the material to improve the flame retardance, and the commonly used flame retardant for the wood-plastic composite material mainly comprises inorganic flame retardant and intumescent flame retardant. Inorganic flame retardants such as aluminum hydroxide and intumescent flame retardants such as ammonium polyphosphate, but such flame retardants themselves require very high loading levels in the matrix to achieve the desired flame retardant effect, and the high addition content of the flame retardant not only negatively affects the mechanical properties of the material, but also causes processing problems, thereby severely restricting the practical application thereof.
In summary, in the existing flame retardant technology of the wood-plastic composite material, the flame retardant is mainly added, the flame retardant is difficult to fully permeate into the gap structure of the plant fiber, the mechanical strength is low, the preparation method is complex, and the flame retardant effect is poor.
Disclosure of Invention
The invention aims to provide a preparation method of a wood-plastic composite material with simple preparation, excellent flame retardant property and high mechanical strength, and adopts the following technical scheme:
a preparation method of a wood-plastic composite material comprises the following steps:
step 1: performing alkali treatment on wood powder or wood fibers to obtain wood fiber powder;
step 2: washing the wood fiber powder to be neutral, and then drying in a vacuum oven for 12-15h to obtain dry wood fiber powder;
and step 3: pre-dispersing the dry fiber powder, chloroform and triethylamine at 65 ℃ for 1-2h to obtain a chloroform solution, and slowly dropwise adding POCl into the chloroform solution3(phosphorus oxychloride) to obtain a mixed solution, and keeping the reaction condition of the mixed solution unchanged to continue reacting for 8-10h to obtain a reaction solution;
and 4, step 4: slowly dripping DDM (diaminodiphenylmethane) into the reaction solution to obtain a reaction stock solution after the dripping is finished, and continuously reacting the reaction stock solution for 16-20h to obtain a reaction product;
and 5: washing the reaction product with acetone and deionized water, and drying to obtain flame-retardant modified wood fiber powder;
step 6: according to the weight parts, 20-40 parts of flame-retardant modified wood fiber powder, 35-50 parts of plastic, 20-30 parts of activated calcium carbonate and 5-10 parts of processing aid are blended to obtain a mixture, and the mixture is extruded and molded.
Preferably, in the mixed solution in the step 3, the mass concentration of the POCl3 (phosphorus oxychloride) is 10% -40%.
Optimally, the mass concentration of the POCl3 (phosphorus oxychloride) is 20-30%.
Preferably, in the reaction stock solution of step 4, the mass concentration of the DDM (diaminodiphenylmethane) is 20% to 50%.
Optimally, the mass concentration of the DDM (diaminodiphenylmethane) is 30-40%.
Preferably, the particles of the wood flour or the wood fibers are 150-200 meshes.
Preferably, the plastic is one or a mixture of polypropylene, polyethylene and polyvinyl chloride.
Most preferably, the plastic is polyethylene or polyvinyl chloride.
Preferably, the processing aid is one or a mixture of more of maleic anhydride, polyethylene wax, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, silane coupling agent and chlorinated polyethylene.
Preferably, the mixture in step 6 further comprises 5-10 parts of metal aluminum fibers.
The preparation method of the invention obtains the flame-retardant wood-plastic composite material through chemical polycondensation, and has simple operation and low production cost. When the wood-plastic composite material is combusted, aromatic rings or aromatic heterocycles are introduced into wood fiber macromolecules in the wood-plastic composite material, so that the concentration and the cohesion among macromolecule chains are increased, the heat resistance and the carbonization degree are improved, thermal cracking is inhibited, the generation of combustible gas is reduced, meanwhile, gases such as water, ammonia gas and the like released by decomposition effectively dilute the combustible gas and reduce the temperature, and a good flame-retardant effect is achieved. After the metal aluminum fiber is added into the wood-plastic composite material, the fireproof and weather-resistant performances are better, and the tensile strength, the bending strength and the dimensional stability are better.
Detailed Description
Example 1:
(1) and carrying out alkali treatment on the wood powder or the wood fiber to obtain wood fiber powder, washing the wood fiber powder to be neutral, and then drying the wood fiber powder in a vacuum oven for 12 hours to obtain the dry wood fiber powder.
(2) Pre-dispersing dry fiber powder, chloroform and triethylamine at 65 ℃ for 1h, and slowly dropwise adding 25% POCl3(phosphorus oxychloride), and continuously reacting for 8 hours to obtain a reaction solution while keeping the reaction conditions unchanged.
(3) Slowly dropwise adding DDM (diaminodiphenylmethane) with the mass concentration of 30% into the reaction solution, continuously reacting for 16 hours after dropwise adding is finished to obtain a reaction product, washing the reaction product with acetone and deionized water, and drying to obtain the flame-retardant modified wood fiber powder.
(4) According to the parts by weight, 30 parts of flame-retardant modified wood powder or wood fiber and 40 parts of PVC (polyvinyl chloride) plastic; 20 parts of active calcium carbonate and 10 parts of processing aid are mixed and then extruded to form the flame-retardant wood-plastic composite material plate.
Table 1 is a comparison table of the test results of the physical mechanical properties and the smoke generation property grades of the flame-retardant wood-plastic board obtained in the example and the flame-retardant wood-plastic board prepared by the conventional method (note: the test refers to national standards GBT29418-2012 and GB 8624-2012).
TABLE 1
Example 2
Compared to example 1, the following changes were made:
according to the parts by weight, 30 parts of flame-retardant modified wood powder or wood fiber and 40 parts of PVC (polyvinyl chloride) plastic; 20 parts of activated calcium carbonate, 10 parts of processing aid and 5 parts of metal aluminum fiber, and the flame-retardant wood-plastic composite material plate is obtained after blending and extrusion molding.
Table 2 is a comparison table of the physical and mechanical properties and the smoke-generating specific effect test results of the flame-retardant wood-plastic plate obtained in example 1 and example 2 (note: the test refers to national standards GBT29418-2012 and GB 8624-2012).
TABLE 2
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims (10)

1. The preparation method of the wood-plastic composite material is characterized by comprising the following steps:
step 1: performing alkali treatment on wood powder or wood fibers to obtain wood fiber powder;
step 2: washing the wood fiber powder to be neutral, and then drying in a vacuum oven for 12-15h to obtain dry wood fiber powder;
and step 3: pre-dispersing the dry fiber powder, chloroform and triethylamine at 65 ℃ for 1-2h to obtain a chloroform solution, and slowly dropwise adding POCl into the chloroform solution3(phosphorus oxychloride) to obtain a mixed solution, and keeping the reaction condition of the mixed solution unchanged to continue reacting for 8-10h to obtain a reaction solution;
and 4, step 4: slowly dripping DDM (diaminodiphenylmethane) into the reaction solution to obtain a reaction stock solution after the dripping is finished, and continuously reacting the reaction stock solution for 16-20h to obtain a reaction product;
and 5: washing the reaction product with acetone and deionized water, and drying to obtain flame-retardant modified wood fiber powder;
step 6: according to the weight parts, 20-40 parts of flame-retardant modified wood fiber powder, 35-50 parts of plastic, 20-30 parts of activated calcium carbonate and 5-10 parts of processing aid are blended to obtain a mixture, and the mixture is extruded and molded.
2. The method of claim 1, wherein: in the mixed solution of step 3, the POCl3The mass concentration of the (phosphorus oxychloride) is 10-40%.
3. The method of claim 2, wherein: the POCl3The mass concentration of the (phosphorus oxychloride) is 20-30%.
4. The method of claim 1, wherein: in the reaction stock solution in the step 4, the mass concentration of the DDM (diaminodiphenylmethane) is 20-50%.
5. The method of claim 4, wherein: the mass concentration of the DDM (diaminodiphenylmethane) is 30-40%.
6. The method of claim 1, wherein: the particles of the wood powder or the wood fibers are 150-200 meshes.
7. The method of claim 1, wherein: the plastic is one or a mixture of more of polypropylene, polyethylene and polyvinyl chloride.
8. The method of claim 7, wherein: the plastic is polyethylene or polyvinyl chloride.
9. The method of claim 1, wherein: the processing aid is one or a mixture of more of maleic anhydride, polyethylene wax, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, silane coupling agent and chlorinated polyethylene.
10. The method of claim 1, wherein: in the step 6, the mixture also comprises 5-10 parts of metal aluminum fibers.
CN201911068261.6A 2019-11-05 2019-11-05 Preparation method of wood-plastic composite material Pending CN110951183A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111572141A (en) * 2020-04-13 2020-08-25 江苏郁林生塑木科技有限公司 Heat-insulation and heat-preservation plastic-wood composite material plate and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160137820A1 (en) * 2014-11-14 2016-05-19 Schill & Seilacher Gmbh Flame retardant wood plastic composite
CN106977844A (en) * 2017-04-11 2017-07-25 华南农业大学 A kind of environmentally friendly, fire-retardant PVC wood plastic composite material and preparation method thereof
CN109593297A (en) * 2018-12-10 2019-04-09 山东霞光集团有限公司 A kind of co-extrusion halogen-free flame-retardant wood moulding material and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160137820A1 (en) * 2014-11-14 2016-05-19 Schill & Seilacher Gmbh Flame retardant wood plastic composite
CN106977844A (en) * 2017-04-11 2017-07-25 华南农业大学 A kind of environmentally friendly, fire-retardant PVC wood plastic composite material and preparation method thereof
CN109593297A (en) * 2018-12-10 2019-04-09 山东霞光集团有限公司 A kind of co-extrusion halogen-free flame-retardant wood moulding material and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
林学葆等: "苎麻纤维的阻燃改性及其对不同PP/MRF/FR 体系阻燃性能", 《2014年全国阻燃学术年会会议论文集 中国阻燃学会会议论文集》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111572141A (en) * 2020-04-13 2020-08-25 江苏郁林生塑木科技有限公司 Heat-insulation and heat-preservation plastic-wood composite material plate and preparation method thereof

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Application publication date: 20200403