CN112480567A - Novel wood-plastic material and preparation method thereof - Google Patents
Novel wood-plastic material and preparation method thereof Download PDFInfo
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- CN112480567A CN112480567A CN202011359409.4A CN202011359409A CN112480567A CN 112480567 A CN112480567 A CN 112480567A CN 202011359409 A CN202011359409 A CN 202011359409A CN 112480567 A CN112480567 A CN 112480567A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use 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; Derivatives of such polymers
- C08J2327/02—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/04—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2327/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2497/00—Characterised by the use of lignin-containing materials
- C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
Abstract
The invention provides a novel wood-plastic material and a preparation method thereof. The wood-plastic material comprises the following raw materials in parts by weight: 65-87 parts of polyvinyl chloride, 52.5-74.5 parts of light calcium carbonate, 15-37 parts of sanding powder, 0.55-0.77 part of foaming agent, 6.5-8.7 parts of regulator, 2.8-5.0 parts of stabilizer, 0.5-0.72 part of stearic acid and 0.45-0.67 part of polyethylene wax. The preparation method comprises the steps of uniformly mixing the light calcium carbonate and the sanding powder under high-speed stirring, then uniformly mixing under low-speed stirring, adding the polyvinyl chloride, the foaming agent, the regulator, the stabilizer, the stearic acid and the polyethylene wax, uniformly mixing to 125-138 ℃, and cooling to obtain a mixed material; and (4) extruding and molding the uniformly mixed material to obtain the novel wood-plastic material. The novel wood-plastic material disclosed by the invention is good in plasticity, strong in wood texture and smooth and fine in surface; the preparation method has simple flow and strong technological requirement adaptability.
Description
Technical Field
The invention relates to the field of wood-plastic synthesis, in particular to a novel wood-plastic material and a preparation method thereof.
Background
Wood-Plastic Composites (WPCs) are Composites of plastics as synthetic polymer materials and plant fibers as natural polymer materials, which are mixed and thermoformed.
At present, the important meanings of effective utilization of resources and environmental protection of the wood-plastic composite material are recognized by people. Although the wood-plastic composite material has wide application potential in multiple fields, due to the instability of the performance of the wood-plastic composition, the state, the component proportion, the preparation process parameters and the like of the wood-plastic raw material must be reasonably controlled to enable the performance of the wood-plastic to meet the use requirement.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the purposes of the invention is to provide a novel wood-plastic material which has good plasticity and is waterproof and fireproof.
The invention provides a novel wood-plastic material which comprises the following raw materials in parts by weight: 65 to 87 portions of polyvinyl chloride, 52.5 to 74.5 portions of light calcium carbonate, 15 to 37 portions of sanding powder, 0.55 to 0.77 portion of foaming agent, 6.5 to 8.7 portions of regulator, 2.8 to 5.0 portions of stabilizer, 0.5 to 0.72 portion of stearic acid and 0.45 to 0.67 portion of polyethylene wax.
In another aspect of the present invention, a method for preparing a novel wood-plastic material is provided, which may include the following steps:
uniformly mixing light calcium and sanding powder to 95-106 ℃ under high-speed stirring, then uniformly mixing to 113-124 ℃ under low-speed stirring, adding polyvinyl chloride, foaming agent, regulator, stabilizer, stearic acid and polyethylene wax, uniformly mixing to 125-138 ℃, and cooling to 40-50 ℃ to obtain a mixed material;
and (4) extruding and molding the uniformly mixed material to obtain the novel wood-plastic material.
Compared with the prior art, the beneficial effects of the invention at least comprise at least one of the following:
(1) the novel wood-plastic material disclosed by the invention is good in plasticity, strong in wood texture, smooth and fine in surface, has the functions of water resistance and fire resistance, good mechanical property, safety and environmental friendliness;
(2) the preparation method has the advantages of simple flow, strong technological requirement adaptability, short preparation time and no use of an initiator.
Detailed Description
Hereinafter, the novel wood plastic material and the method for preparing the same according to the present invention will be described in detail with reference to exemplary embodiments.
In an exemplary embodiment of the novel wood plastic material of the present invention, the novel wood plastic material may include the following raw materials in parts by weight:
65 to 87 portions of polyvinyl chloride, 52.5 to 74.5 portions of light calcium carbonate, 15 to 37 portions of sanding powder, 0.55 to 0.77 portion of foaming agent, 6.5 to 8.7 portions of regulator, 2.8 to 5.0 portions of stabilizer, 0.5 to 0.72 portion of stearic acid and 0.45 to 0.67 portion of polyethylene wax.
The novel wood-plastic material is a composite material formed by mixing polyvinyl chloride (PVC) serving as a matrix and sanding powder. The novel wood-plastic material is provided with 65-87 parts of polyvinyl chloride, so that the wood-plastic material has a better elastic modulus, and the elastic modulus of the wood-plastic material is larger than 3000 MPa. The sanding powder in 15-37 parts is matched with the polyvinyl chloride in 65-87 parts, so that the wood-plastic material has good compression-resistant and bending-resistant physical and mechanical properties, the bending strength of the wood-plastic material can reach more than 30MP, the bending modulus can reach more than 3000MPa, and the tensile strength can reach more than 26.5 MPa. The light calcium carbonate can play a role in filling and flame retardance, so that the volume of the wood-plastic material can be increased, the generation cost is reduced, and the wood-plastic material has good flame retardance.
Stearic acid and polyethylene wax (PE wax) function as lubricants. The regulator is used for preventing the bubbles from being broken after the foaming agent is foamed, and is a bubble regulator. The foaming agent, the regulator and the stabilizer can be common reagents for preparing the wood-plastic material.
As described above, the novel wood-plastic material of the present invention may be composed of the above raw materials in parts by weight, and may further include other additives, for example, a predetermined amount of a coupling agent may be added in order to further enhance the compatibility of polyvinyl chloride with the sanding powder.
Further, the novel wood-plastic material can comprise the following raw materials in parts by weight: 70 to 81 portions of polyvinyl chloride, 57.5 to 71.2 portions of light calcium carbonate, 20 to 31 portions of sanding powder, 0.61 to 0.71 portion of foaming agent, 7.1 to 8.3 portions of regulator, 3.1 to 4.6 portions of stabilizer, 0.56 to 0.68 portion of stearic acid and 0.51 to 0.64 portion of polyethylene wax. The wood-plastic material with the components in proportion can further improve the mechanical property of the wood-plastic material, the bending strength can reach more than 35.2MPa, the bending modulus can reach more than 3150MPa, and the tensile strength can reach more than 30.0 MPa. Furthermore, the novel wood-plastic material can comprise the following raw materials in parts by weight: 73 parts of polyvinyl chloride, 60 parts of light calcium carbonate, 21 parts of sanding powder, 0.61 part of foaming agent, 7.4 parts of regulator, 3.2 parts of stabilizer, 0.67 part of stearic acid and 0.63 part of polyethylene wax. The novel wood-plastic material prepared by the components according to the proportion can enable the bending strength of the wood-plastic material to reach 37.0MPa on average, the bending modulus to reach 3450.0MPa on average and the tensile strength to reach 33.0MPa on average.
Further, the polyvinyl chloride may be of the SG-8 type. The average polymerization degree of the polyvinyl chloride is 650-750.
Furthermore, the content of the sanding powder has a remarkable influence on the performance of the wood plastic, so that the content of the sanding powder needs to be matched with other components. With the increase of the content of the sanding powder, the bending strength of the wood plastic is firstly increased and then reduced. When the mass part of the sanding powder is less than 15 parts by weight, the bending strength of the wood plastic is very low, even lower than 25 MPa. The bending strength of the wood plastic is gradually improved along with the increase of the mass parts of the sanding powder, but after the sanding powder is increased to a certain degree, the polyvinyl chloride cannot effectively wrap the fibers, so that the bonding strength of the interface is reduced, the number of the bonding strength is more, the bending strength of the wood plastic is reduced, and the weight parts of the sanding powder are controlled to be below 37 parts.
The sanding powder consists of wood powder and bamboo powder. Wood flour and bamboo flour are wood processing leftovers, for example, leftovers in the manufacture of wood doors. The leftover materials in the wooden door manufacturing process can be used for further reasonably utilizing resources, and the purpose of recycling is achieved. The ratio of the wood powder to the bamboo powder can be 1: 0.8-1.2 by mass. The addition amount of the bamboo powder can influence the mechanical properties of the wood-plastic material, such as flexural modulus, tensile strength and the like. The bamboo powder is used in a small amount, and the bending modulus of the wood plastic is small; with the increase of the content of the bamboo powder, the bending strength is firstly increased and then reduced. The content of the wood powder has an influence on the flexural modulus and the flexural strength of the wood plastic, and according to an experimental surface, the flexural modulus gradually increases with the increase of the content of the wood powder, and the flexural strength first increases and then decreases. Therefore, in order to enable the wood plastic to have better mechanical property, the mass ratio of the wood powder to the bamboo powder in the wood plastic is controlled to be 1: 0.8-1.2. Preferably, the mass ratio of the wood powder to the bamboo powder is 1:1, and the wood-plastic material has higher flexural modulus and higher tensile strength.
Furthermore, the density of the novel wood-plastic material is 0.6g/cm3～1.1g/cm3。
In another aspect of the present invention, there is provided a method for preparing a novel wood-plastic material, and in an exemplary embodiment of the method for preparing a novel wood-plastic material of the present invention, the method may include:
step 1, uniformly mixing light calcium carbonate and sanding powder to 95-106 ℃ under high-speed stirring, then uniformly mixing to 113-124 ℃ under low-speed stirring, adding polyvinyl chloride, a foaming agent, a regulator, a stabilizer, stearic acid and polyethylene wax, uniformly mixing to 125-138 ℃, and cooling to obtain a mixed material. The cooling temperature may be 40 ℃ to 50 ℃.
And 2, extruding and molding the uniformly mixed material to obtain the novel wood-plastic material.
Furthermore, because the sanding powder contains a certain amount of moisture, if the sanding powder contains more moisture, the water can be preheated and vaporized in the processing process of polyvinyl chloride, pores are easily formed in the wood-plastic material or the surface of the wood-plastic material is rough, and water removal treatment is required in the preparation process of the wood-plastic material. However, the temperature in the water removal process is not suitable to be too high, so that the sanding powder is likely to smoke and even burn, and the cellulose in the sanding powder is likely to be thermally degraded at high temperature, so that the cellulose is likely to have no fibrous characteristics due to severe reduction of the degree of polymerization, and the mechanical properties of the wood-plastic material are affected. Based on the influence, the invention firstly rapidly heats the sanding powder under the high-speed rotation stirring of 1300 r/min-1550 r/min (heat is generated in the rotation process) to rapidly and preliminarily remove the moisture in the sanding powder, and the temperature generated during the high-speed stirring is controlled to be 95-106 ℃, so that most of moisture can be removed at a proper temperature, and the sanding powder is ensured to have fiber characteristics.
Under the mutual cooperation of the high-speed rotation speed and the generated temperature, after the primary water removal is carried out on the sanding powder at 95-106 ℃, the sanding powder is kept at the high-speed rotation temperature for less than 5min or the rotation speed can be quickly reduced, and the sanding powder is stirred and heated to 113-124 ℃ under the condition that the rotation speed is 500-700 r/min for further water removal. Likewise, the temperature generated by agitation cannot be made too high to affect the fiber properties of the sanding powder. However, the water removal efficiency of the sanding powder is affected by too low temperature, so the temperature is controlled to be 113-124 ℃ at a low stirring speed. Preferably, the light calcium carbonate and the sanding powder are uniformly mixed to 105 ℃ under the high-speed stirring of 1400r/min, and then are uniformly mixed to 118 ℃ under the low-speed stirring of 650r/min, under the condition, the water removal efficiency and the water removal effect can be ensured without changing the performance of the sanding powder, and the performance of the sanding powder is not changed.
Further, after the polyvinyl chloride, the foaming agent, the regulator, the stabilizer, the stearic acid and the polyethylene wax are added, the temperature can be raised to 125-138 ℃ under continuous low-speed stirring, and the mixture is cooled to 40-50 ℃ after being uniformly stirred, so that the uniform mixture is obtained.
Further, the extrusion molding of the kneaded material may be performed in a screw extruder, which may be a single screw extruder or a twin screw extruder.
Furthermore, in the process of extrusion molding of the mixed materials, the extrusion temperature can be 180-190 ℃, and the temperature of a die head can be 190-200 ℃. For example, the extrusion temperature may be 182 ℃ and the die temperature may be 195 ℃.
Further, in the extrusion molding process using the screw extruder, the temperature of the confluence core may be 140 ℃ to 160 ℃, the current of the machine barrel may be 20A to 22A, and the temperature of the cooling water may be lower than 10 ℃. For example, the combined core temperature may be 148 ℃, the barrel current may be 20.8A, and the cooling water temperature may be 8 ℃.
In order that the above-described exemplary embodiments of the invention may be better understood, further description thereof with reference to specific examples is provided below.
Example 1
The raw materials of the novel wood-plastic material in the example comprise the following components:
65kg of polyvinyl chloride, 53kg of light calcium carbonate, 16kg of sanding powder (8 kg of wood powder and 8kg of bamboo powder), 7.2kg of foaming agent MSV-2060.62 kg of HL-100 foaming regulator, 3.2kg of CH401 calcium zinc stabilizer, 0.60kg of stearic acid and 0.52kg of polyethylene wax.
The preparation of the novel wood-plastic material in this example comprises:
step 1, uniformly mixing the light calcium carbonate and the sanding powder with the weight at a high speed of 1300r/min, heating to 95 ℃, then uniformly mixing the light calcium carbonate and the sanding powder at a low speed of 500r/min, heating to 113 ℃, adding the polyvinyl chloride, the foaming agent, the regulator, the stabilizer, the stearic acid and the polyethylene wax with the weight, uniformly mixing, heating to 125 ℃, uniformly mixing, and cooling to 40 ℃ to obtain a mixed material;
and 2, in a double-screw extruder, controlling the extrusion temperature to be 180 ℃, the die head temperature to be 190 ℃, the confluence core temperature to be 142 ℃, the machine barrel current to be 20.2A and the cooling water temperature to be 7 ℃, and performing extrusion molding to obtain the novel wood-plastic material. The novel wood-plastic material is subjected to performance detection, the bending strength is 33.5MPa, the bending modulus is more than 3050MPa, and the tensile strength can be 26.8 MPa.
Example 2
The raw materials of the novel wood-plastic material in the example comprise the following components:
65kg of polyvinyl chloride, 53kg of light calcium carbonate, 16kg of sanding powder (8.9 kg of wood powder and 7.1kg of bamboo powder), 7.2kg of foaming agent MSV-2060.62 kg of foaming regulator HL-100, 3.2kg of CH401 calcium zinc stabilizer, 0.60kg of stearic acid and 0.52kg of polyethylene wax.
The preparation of the novel wood-plastic material in this example comprises:
step 1, uniformly mixing the light calcium carbonate and the sanding powder with the weight at a high speed of 1300r/min, heating to 95 ℃, then uniformly mixing the light calcium carbonate and the sanding powder at a low speed of 500r/min, heating to 113 ℃, adding the polyvinyl chloride, the foaming agent, the regulator, the stabilizer, the stearic acid and the polyethylene wax with the weight, uniformly mixing, heating to 125 ℃, uniformly mixing, and cooling to 40 ℃ to obtain a mixed material;
and 2, in a double-screw extruder, controlling the extrusion temperature to be 180 ℃, the die head temperature to be 190 ℃, the confluence core temperature to be 142 ℃, the machine barrel current to be 20.2A and the cooling water temperature to be 7 ℃, and performing extrusion molding to obtain the novel wood-plastic material. The novel wood-plastic material is subjected to performance detection, the bending strength is 30.2MPa, the bending modulus is more than 3070MPa, and the tensile strength can be 26.7 MPa.
Example 3
The raw materials of the novel wood-plastic material in the example comprise the following components:
65kg of polyvinyl chloride, 53kg of light calcium carbonate, 16kg of sanding powder (7.3 kg of wood powder and 8.7kg of bamboo powder), 7.2kg of foaming agent MSV-2060.62 kg of foaming agent HL-100, 3.2kg of CH401 calcium zinc stabilizer, 0.60kg of stearic acid and 0.52kg of polyethylene wax.
The preparation of the novel wood-plastic material in this example comprises:
step 1, uniformly mixing the light calcium carbonate and the sanding powder with the weight at a high speed of 1300r/min, heating to 95 ℃, then uniformly mixing the light calcium carbonate and the sanding powder at a low speed of 500r/min, heating to 113 ℃, adding the polyvinyl chloride, the foaming agent, the regulator, the stabilizer, the stearic acid and the polyethylene wax with the weight, uniformly mixing, heating to 125 ℃, uniformly mixing, and cooling to 40 ℃ to obtain a mixed material;
and 2, in a double-screw extruder, controlling the extrusion temperature to be 180 ℃, the die head temperature to be 190 ℃, the confluence core temperature to be 142 ℃, the machine barrel current to be 20.2A and the cooling water temperature to be 7 ℃, and performing extrusion molding to obtain the novel wood-plastic material. The novel wood-plastic material is subjected to performance detection, the bending strength is 31.4MPa, the bending modulus is more than 3089MPa, and the tensile strength can be 27.1 MPa.
Comparative example 1
The wood-plastic material in this example comprises the following raw materials:
65kg of polyvinyl chloride, 53kg of light calcium carbonate, 12kg of sanding powder (6 kg of wood powder and 6kg of bamboo powder), 7.2kg of foaming agent MSV-2060.62 kg of HL-100 foaming regulator, 3.2kg of CH401 calcium zinc stabilizer, 0.60kg of stearic acid and 0.52kg of polyethylene wax.
The preparation of the wood-plastic material in this example comprises:
step 1, uniformly mixing the light calcium carbonate and the sanding powder with the weight at a high speed of 1300r/min, heating to 95 ℃, then uniformly mixing the light calcium carbonate and the sanding powder at a low speed of 500r/min, heating to 113 ℃, adding the polyvinyl chloride, the foaming agent, the regulator, the stabilizer, the stearic acid and the polyethylene wax with the weight, uniformly mixing, heating to 125 ℃, uniformly mixing, and cooling to 40 ℃ to obtain a mixed material;
and 2, in a double-screw extruder, controlling the extrusion temperature to be 180 ℃, the die head temperature to be 190 ℃, the confluence core temperature to be 142 ℃, the machine barrel current to be 20.2A and the cooling water temperature to be 7 ℃, and performing extrusion molding to obtain the novel wood-plastic material. The novel wood-plastic material is subjected to performance detection, and the bending strength is 26.5 MPa.
Comparative example 2
The wood-plastic material in this example comprises the following raw materials:
65kg of polyvinyl chloride, 53kg of light calcium carbonate, 40kg of sanding powder (20 kg of wood powder and 20kg of bamboo powder), 7.2kg of foaming agent MSV-2060.62 kg of HL-100 foaming regulator, 3.2kg of CH401 calcium zinc stabilizer, 0.60kg of stearic acid and 0.52kg of polyethylene wax.
The preparation of the wood-plastic material in this example comprises:
step 1, uniformly mixing the light calcium carbonate and the sanding powder with the weight at a high speed of 1300r/min, heating to 95 ℃, then uniformly mixing the light calcium carbonate and the sanding powder at a low speed of 500r/min, heating to 113 ℃, adding the polyvinyl chloride, the foaming agent, the regulator, the stabilizer, the stearic acid and the polyethylene wax with the weight, uniformly mixing, heating to 125 ℃, uniformly mixing, and cooling to 40 ℃ to obtain a mixed material;
and 2, in a double-screw extruder, controlling the extrusion temperature to be 180 ℃, the die head temperature to be 190 ℃, the confluence core temperature to be 142 ℃, the machine barrel current to be 20.2A and the cooling water temperature to be 7 ℃, and performing extrusion molding to obtain the novel wood-plastic material. The novel wood-plastic material is subjected to performance detection, and the bending strength is 23.8 MPa.
TABLE 1 comparison of composition conditions and flexural Strength for examples 1-3 and comparative examples
As can be seen from table 1, the sanding powders of examples 1 to 3 have the same weight ratio, but the sanding powders have different composition ratios, and when the mass ratio of wood powder to bamboo powder is 1:1, the bending strength is the highest, and at this time, the wood powder to bamboo powder is the optimal ratio. In the comparative example 1, the sanding powder is different from that in the comparative examples 1 and 2, and when the sanding powder is contained in the wood plastic too much or too little, the bending strength of the wood plastic is affected.
Example 4
The raw materials of the novel wood-plastic material in the example comprise the following components:
72kg of polyvinyl chloride, 58kg of light calcium carbonate, 25kg of sanding powder (12 kg of wood powder and 13kg of bamboo powder), 7.2kg of foaming agent MSV-2060.65 kg of HL-100 foaming regulator, 3.2kg of CH401 calcium zinc stabilizer, 0.63kg of stearic acid and 0.53kg of polyethylene wax.
The preparation of the novel wood-plastic material in this example comprises:
step 1, uniformly mixing the light calcium carbonate and the sanding powder with the weight at a high speed of 1500r/min, heating to 104 ℃, uniformly mixing the light calcium carbonate and the sanding powder at a low speed of 680r/min, heating to 121 ℃, adding the polyvinyl chloride, the foaming agent, the regulator, the stabilizer, the stearic acid and the polyethylene wax with the weight, uniformly mixing, heating to 126 ℃, uniformly mixing, and cooling to 45 ℃ to obtain a mixed material;
and 2, in a double-screw extruder, controlling the extrusion temperature to be 190 ℃, the die head temperature to be 198 ℃, the temperature of the confluence core to be 157 ℃, the machine barrel current to be 21.8A and the temperature of cooling water to be 5 ℃, and performing extrusion molding to obtain the novel wood-plastic material. The novel wood-plastic material is subjected to performance detection, the bending strength is 36.3MPa, the bending modulus is more than 3205MPa, and the tensile strength can be 30.5 MPa.
Example 5
The raw materials of the novel wood-plastic material in the example comprise the following components:
79kg of polyvinyl chloride, 70kg of light calcium carbonate, 30kg of sanding powder (15 kg of wood powder and 15kg of bamboo powder), 8.2kg of foaming agent MSV-2060.70 kg of HL-100 foaming regulator, 4.4kg of CH401 calcium zinc stabilizer, 0.65kg of stearic acid and 0.60kg of polyethylene wax.
The preparation of the novel wood-plastic material in this example comprises:
step 1, uniformly mixing the light calcium carbonate and the sanding powder in the weight at a high speed of 1400r/min, heating to 104 ℃, then uniformly mixing the light calcium carbonate and the sanding powder at a low speed of 580r/min, heating to 121 ℃, adding the polyvinyl chloride, the foaming agent, the regulator, the stabilizer, the stearic acid and the polyethylene wax in the weight, uniformly mixing, heating to 126 ℃, uniformly mixing, and cooling to 50 ℃ to obtain a mixed material;
and 2, in a double-screw extruder, controlling the extrusion temperature to be 185 ℃, the die head temperature to be 193 ℃, the temperature of the confluence core to be 148 ℃, the current of a machine barrel to be 21.0A and the temperature of cooling water to be 5 ℃, and performing extrusion molding to obtain the novel wood-plastic material. The novel wood-plastic material is subjected to performance detection, the bending strength is 36.2MPa, the bending modulus is more than 3230MPa, and the tensile strength can be 31.2 MPa.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The novel wood-plastic material is characterized by comprising the following raw materials in parts by weight:
65-87 parts of polyvinyl chloride, 52.5-74.5 parts of light calcium carbonate, 15-37 parts of sanding powder, 0.55-0.77 part of foaming agent, 6.5-8.7 parts of regulator, 2.8-5.0 parts of stabilizer, 0.5-0.72 part of stearic acid and 0.45-0.67 part of polyethylene wax.
2. The novel wood-plastic material as claimed in claim 1, characterized by comprising the following raw materials in parts by weight:
70-81 parts of polyvinyl chloride, 57.5-71.2 parts of light calcium carbonate, 20-31 parts of sanding powder, 0.61-0.71 part of foaming agent, 7.1-8.3 parts of regulator, 3.1-4.6 parts of stabilizer, 0.56-0.68 part of stearic acid and 0.51-0.64 part of polyethylene wax.
3. The novel wood-plastic material according to claim 1 or 2, characterized by comprising the following raw materials in parts by weight:
73 parts of polyvinyl chloride, 60 parts of light calcium carbonate, 21 parts of sanding powder, 0.61 part of foaming agent, 7.4 parts of regulator, 3.2 parts of stabilizer, 0.67 part of stearic acid and 0.63 part of polyethylene wax.
4. A novel wood-plastic material according to claim 1 or 2, wherein the polyvinyl chloride is polyvinyl chloride having an average degree of polymerization of 650 to 750.
5. A novel wood-plastic material as claimed in claim 1 or 2, characterized in that the sanding powder consists of wood flour and bamboo flour in a weight ratio of 1: 0.8-1.2.
6. A novel wood-plastic material according to claim 1 or 2, characterized in that the density of the wood-plastic material is 0.6g/cm3~1.1 g/cm3。
7. A method for preparing a novel wood-plastic material according to any one of claims 1 to 6, characterized in that it comprises the following steps:
uniformly mixing light calcium and sanding powder to 95-106 ℃ under high-speed stirring, then uniformly mixing to 113-124 ℃ under low-speed stirring, adding polyvinyl chloride, a foaming agent, a regulator, a stabilizer, stearic acid and polyethylene wax, uniformly mixing to 125-138 ℃, and cooling to obtain a mixed material;
and (4) extruding and molding the uniformly mixed material to obtain the novel wood-plastic material.
8. The preparation method of the novel wood-plastic material as claimed in claim 7, wherein the rotation speed of the high-speed stirring is 1300r/min to 1550r/min, and the rotation speed of the low-speed stirring is 500r/min to 700 r/min.
9. The preparation method of the novel wood-plastic material as claimed in claim 7 or 8, wherein the extrusion molding of the blended material comprises adding the blended material into an extruder, and controlling the extrusion temperature to be 180-190 ℃ and the die head temperature to be 190-200 ℃.
10. The preparation method of the novel wood-plastic material as claimed in claim 9, wherein the extrusion molding of the mixed material further comprises controlling the temperature of the confluence core to be 140 ℃ to 160 ℃, the current of the machine barrel to be 20A to 22A, and the temperature of the cooling water to be lower than 10 ℃.
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| US6066680A (en) * | 1996-05-16 | 2000-05-23 | Marley Mouldings Inc. | Extrudable composite of polymer and wood flour |
| CN101100555A (en) * | 2007-06-30 | 2008-01-09 | 重庆星星套装门有限责任公司 | Bamboo-plastic composite section bar |
| CN101139453A (en) * | 2007-08-23 | 2008-03-12 | 钟林 | Circulating mix-smelting plastic-wood composite material, production method and freight pallet manufactured by the same |
| CN101525456A (en) * | 2008-03-03 | 2009-09-09 | 翁端华 | PVC wood-plastic low foaming granule material and preparation method thereof |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6066680A (en) * | 1996-05-16 | 2000-05-23 | Marley Mouldings Inc. | Extrudable composite of polymer and wood flour |
| CN101100555A (en) * | 2007-06-30 | 2008-01-09 | 重庆星星套装门有限责任公司 | Bamboo-plastic composite section bar |
| CN101139453A (en) * | 2007-08-23 | 2008-03-12 | 钟林 | Circulating mix-smelting plastic-wood composite material, production method and freight pallet manufactured by the same |
| CN101525456A (en) * | 2008-03-03 | 2009-09-09 | 翁端华 | PVC wood-plastic low foaming granule material and preparation method thereof |
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