CN111171591A - Extrusion molding formula and molding method for PE plastic wood without granulation - Google Patents

Extrusion molding formula and molding method for PE plastic wood without granulation Download PDF

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Publication number
CN111171591A
CN111171591A CN201911406424.7A CN201911406424A CN111171591A CN 111171591 A CN111171591 A CN 111171591A CN 201911406424 A CN201911406424 A CN 201911406424A CN 111171591 A CN111171591 A CN 111171591A
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wood
plastic
formula
parts
extrusion molding
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Inventor
许开华
蒋振康
吕怀兴
张云河
胡修才
涂重丹
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Hunan Green Meiyinghong Resources Recycling Co ltd
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Hunan Green Meiyinghong Resources Recycling Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L99/00—Compositions of natural macromolecular compounds or of derivatives thereof not provided for in groups C08L89/00 - C08L97/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/002—Methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses an extrusion molding formula and a molding method for PE plastic wood without granulation, wherein the extrusion molding formula comprises the following components in percentage by weight: 20-30% of HDPE plastic particles, 63-72% of filler, 2-3.7% of lubricant, 1.5-3% of compatilizer, 0.4-0.8% of functional assistant and 1.3-3.2% of pigment; the filler comprises rice bran powder, wood powder and talcum powder. The components in the formula have mutual synergistic effect, and the method can be matched with the formula to form the process of granulating the formula materials in the traditional plastic-wood process in one step under certain processing parameters, so that the plastic-wood processing production line can be shortened, the labor is saved, the economic benefit is improved, and the environmental protection problem existing in a plastic-wood pretreatment workshop can be relieved; and the surface quality of the extruded sample is good, and the bending property and the aging property are better than those of the extruded sample in the prior art.

Description

Extrusion molding formula and molding method for PE plastic wood without granulation
Technical Field
The invention relates to the technical field of plastic-wood processing, in particular to an extrusion molding formula and a molding method for PE plastic-wood granulation-free extrusion molding.
Background
The plastic-wood composite material is a new generation of green environment-friendly material which is internationally and vigorously aroused in recent years, and the main production raw materials of the plastic-wood composite material comprise plastics, a filling agent, a compatilizer, a lubricant, an industrial pigment, a functional assistant and the like. The plastic-wood composite material section has lower cost, can replace wood and plastic products, is widely applied internationally, obtains general attention at home and continuously expands the application field.
The traditional manufacturing process of the plastic-wood composite material product mainly comprises the steps of granulating by using a double-screw extruder, plasticizing by using a conical double-screw extruder and extruding and molding by using a die. If the extrusion molding is carried out by adopting a one-step method, the surface smoothness of an extruded sample is poor, and the shaping is difficult. How to develop a granulation-free method with poor surface smoothness of an extruded sample and easy shaping becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an extrusion molding formula and a method for PE plastic wood without granulation, the process of plastic wood pretreatment granulation is eliminated, granulation is not needed, the surface quality of an extruded sample is good, and the bending performance and the aging performance are good.
The invention is realized by the following steps:
one of the purposes of the invention is to provide an extrusion molding formula for PE plastic wood without granulation, which comprises the following components in percentage by weight: 20-30% of HDPE plastic particles, 63-72% of filler, 2-3.7% of lubricant, 1.5-3% of compatilizer, 0.4-0.8% of functional assistant and 1.3-3.2% of pigment; the filler comprises rice bran powder, wood powder and talcum powder.
Preferably, the filler comprises, by weight, 32-43 parts of rice bran powder, 8-26 parts of wood powder and 13 parts of talcum powder. Specifically, the mesh number of the rice bran powder, the wood powder and the talcum powder refers to the standard GB 6005-85: the mesh number of the wood powder and the rice bran powder is required to be 100 percent and pass through a 50-mesh screen, 98 percent of the wood powder and the rice bran powder pass through a 60-mesh screen and less than 20 percent of the rice powder pass through a 150-mesh screen, and the mesh number of the talcum powder is 600-800 meshes.
Preferably, the HDPE granular material has the diameter of 5 +/-0.5 mm, the melt index of 3-4 and the ash content of 2-3%.
Preferably, the lubricant has a melting point of 80 ℃ or higher, and the effective component of the lubricant is stearate series, and the effective content of the effective component is more than 80%.
Preferably, the compatilizer is maleic anhydride grafted polyolefin, the melt index of the compatilizer is 1.5-2.5 g/10min, and the grafting ratio is 0.6-0.8 wt%.
The invention also aims to provide a granulation-free extrusion molding method for PE plastic wood, which comprises the following steps:
step 1, weighing the raw materials in the formula, plasticizing and mixing the raw materials at 130-140 ℃ for a period of time, and cooling the mixture to below 60 ℃ to obtain a mixed plastic-wood formula material;
and 2, directly extruding and molding the plastic-wood formula material obtained in the step 1 in a plastic-wood molding machine according to certain processing parameters to obtain the plastic-wood extruded section.
Preferably, a high-low mixer is used for mixing in the step 1.
Preferably, the processing parameters in step 2 include:
preferably, the temperatures of a first zone, a second zone, a third zone, a fourth zone and a confluence core of a machine barrel in the plastic-wood forming machine table are 193-197 ℃, 188-192 ℃, 173-178 ℃, 163-167 ℃ and 153-157 ℃ in sequence; the temperature of a first area, a second area, a third area and a fourth area of the die in the plastic-wood forming machine table is 148-152 ℃.
Preferably, the extrusion linear speed during extrusion molding is 0.46-0.75 m/min.
Compared with the prior art, the invention has the following advantages and effects:
according to the extrusion molding formula for PE plastic wood granulation-free, the components have mutual synergistic effect, the filler comprises three components of rice bran powder, wood powder and talcum powder in a certain proportion, the components are matched with each other, and the process of granulating the formula materials in the traditional plastic wood process can be formed in one step by matching with the method of the invention under certain processing parameters, so that the plastic wood processing production line can be shortened, the labor is saved, the economic benefit is improved, and the environmental protection problem existing in a plastic wood pretreatment workshop can be relieved; and the surface quality of the extruded sample is good, and the bending property and the aging property are better than those of the extruded sample in the prior art.
Detailed Description
Example 1
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The formula table comprises the following components in parts by mass:
HDPE plastic particles: 26 parts of (1);
rice bran powder: 43 parts of a mixture;
wood powder: 8 parts of a mixture;
talc powder: 13 parts;
a compatilizer: 2.8 parts;
lubricant: 3.7 parts;
functional auxiliary agents: 0.78 part;
pigment: 2.72 parts.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 1.
TABLE 1
Figure BDA0002348756790000031
Figure BDA0002348756790000041
(3) The extruded plastic-wood section is subjected to various performance tests, including density test, bending performance test, water boiling test and ultraviolet aging performance test results, as shown in table 2.
TABLE 2
Figure BDA0002348756790000042
With this formulation, the surface quality of the extruded sample was good.
Example 2
Accurately weighing the formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture into a low mixer when the high mixing temperature reaches 135 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain plastic-wood extruded sections.
(1) The formula table comprises the following components in parts by mass:
HDPE plastic particles: 30 parts of (1);
rice bran powder: 35 parts of (B);
wood powder: 15 parts of (1);
talc powder: 13 parts;
a compatilizer: 1.5 parts;
lubricant: 2.0 parts of (B);
functional auxiliary agents: 0.5 part;
pigment: and 3 parts.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 3.
TABLE 3
Figure BDA0002348756790000051
(3) The extruded wood-plastic section is subjected to various performance tests including a density test, a bending performance test, a water boiling test and an ultraviolet aging performance test, and the results are shown in table 4.
TABLE 4
Figure BDA0002348756790000052
With this formulation, the surface quality of the extruded sample was better.
Example 3
Accurately weighing the formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture into a low mixer when the high mixing temperature reaches 140 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain plastic-wood extruded sections.
(1) The formula table comprises the following components in parts by mass:
HDPE plastic particles: 20 parts of (1);
rice bran powder: 43 parts of a mixture;
wood powder: 16 parts of a mixture;
talc powder: 13 parts;
a compatilizer: 2.2 parts of;
lubricant: 2.3 parts of a mixture;
functional auxiliary agents: 0.6 part;
pigment: 2.9 parts.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 5.
TABLE 5
Figure BDA0002348756790000061
(3) The extruded wood-plastic section is subjected to various performance tests, including density test, bending performance test, water boiling test and ultraviolet aging performance test, as shown in table 6.
TABLE 6
Figure BDA0002348756790000062
Figure BDA0002348756790000071
With the formulation, the surface quality of the extruded sample is better.
Example 4
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The formula table comprises the following components in parts by mass:
HDPE plastic particles: 28 parts of (1);
rice bran powder: 32 parts of (1);
wood powder: 21 parts of (1);
talc powder: 13 parts;
a compatilizer: 1.5 parts;
lubricant: 2.0 parts of (B);
functional auxiliary agents: 0.4 part;
pigment: 2.1 parts.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 7.
TABLE 7
Figure BDA0002348756790000072
(3) The extruded wood-plastic section is subjected to various performance tests including density test, bending performance test, water boiling test and ultraviolet aging performance test as shown in table 8.
TABLE 8
Figure BDA0002348756790000081
Under the process and the formula, the surface quality of the extruded sample is good.
Example 5
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The formula table comprises the following components in parts by mass:
HDPE plastic particles: 21 parts of (1);
rice bran powder: 33 parts of (B);
wood powder: 26 parts of (1);
talc powder: 13 parts;
a compatilizer: 3.0 parts of (B);
lubricant: 2.3 parts of a mixture;
functional auxiliary agents: 0.4 part;
pigment: 1.3 parts.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 9.
TABLE 9
Figure BDA0002348756790000082
Figure BDA0002348756790000091
(3) The extruded wood-plastic section is subjected to various performance tests including density test, bending performance test, water boiling test and ultraviolet aging performance test as shown in table 10.
Watch 10
Figure BDA0002348756790000092
With this formulation, the surface quality of the extruded sample was better.
Example 6
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The components and the mass ratio in the formula table are the same as those in example 5.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 11.
TABLE 11
Figure BDA0002348756790000093
Figure BDA0002348756790000101
(3) The extruded wood-plastic section is subjected to various performance tests including appearance effect, density test, bending performance test, water boiling test and ultraviolet aging performance test as shown in table 12.
TABLE 12
Figure BDA0002348756790000102
At this process temperature, the surface of the extruded sample was still, relatively flat, slightly inferior to that of example 5. The effect is better than that of the comparison ratio of 5-6.
Example 7
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The components and the mass ratio in the formula table are the same as those in example 5.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 13.
Watch 13
Figure BDA0002348756790000111
(3) The extruded wood-plastic section is subjected to various performance tests including appearance effect evaluation, density test, bending performance test, water boiling test and ultraviolet aging performance test as shown in table 14.
TABLE 14
Figure BDA0002348756790000112
At this process temperature, the extruded sample was still, flatter and slightly less smooth than example 5. The effect is better than that of the comparison ratio of 5-6.
Comparative example 1
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The formula table comprises the following components in parts by mass:
HDPE plastic particles: 28 parts of (1);
rice bran powder: 26 parts of (1);
wood powder: 18 parts of a mixture;
talc powder: 22 parts of (A);
a compatilizer: 1.5 parts;
lubricant: 2.0 parts of (B);
functional auxiliary agents: 0.4 part;
pigment: 2.1 parts.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 15.
Watch 15
Figure BDA0002348756790000121
(3) The extruded wood-plastic section was subjected to various performance tests including appearance effect evaluation, density test, bending performance test, water boiling test and ultraviolet aging performance test, and the results are shown in table 16.
TABLE 16
Figure BDA0002348756790000122
With this process and formulation, a slight skin-lifting phenomenon occurred on the surface of the extruded sample.
Comparative example 2
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The formula table comprises the following components in parts by mass:
HDPE plastic particles: 28 parts of (1);
rice bran powder: 28 parts of (1);
wood powder: 18 parts of a mixture;
talc powder: 20 parts of (1);
a compatilizer: 1.5 parts;
lubricant: 2.0 parts of (B);
functional auxiliary agents: 0.4 part;
pigment: 2.1 parts.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in Table 17.
TABLE 17
Figure BDA0002348756790000131
(3) The results of various performance tests including appearance effect evaluation, density test, bending performance test, water boiling test and ultraviolet aging performance test on the extruded wood-plastic section are shown in table 18.
Watch 18
Figure BDA0002348756790000132
Figure BDA0002348756790000141
With this process and formulation, a slight skin-lifting phenomenon occurred on the surface of the extruded sample.
Comparative example 3
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The formula table comprises the following components in parts by mass:
HDPE plastic particles: 26 parts of (1);
rice bran powder: 29 parts;
wood powder: 25 parts of (1);
talc powder: 13 parts;
a compatilizer: 2.1 parts;
lubricant: 2.5 parts;
functional auxiliary agents: 0.4 part;
pigment: 2.0 parts.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in Table 19.
Watch 19
Figure BDA0002348756790000142
(3) The extruded wood-plastic section was subjected to various performance tests including appearance effect evaluation, density test, bending performance test, water boiling test and ultraviolet aging performance test, and the results are shown in table 20.
Watch 20
Figure BDA0002348756790000151
At the process temperature, the surface of an extruded sample is seriously painted, and the extruded profile can crack after the linear speed is fast.
Comparative example 4
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The formula table comprises the following components in parts by mass:
HDPE plastic particles: 26 parts of (1);
rice bran powder: 28 parts of (1);
wood powder: 24 parts of (1);
talc powder: 13 parts;
a compatilizer: 2 parts of (1);
lubricant: 3.3 parts;
functional auxiliary agents: 0.5 part;
pigment: 3.2 parts.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 21.
TABLE 21
Figure BDA0002348756790000161
(3) The extruded wood-plastic section was subjected to various performance tests including appearance effect evaluation, density test, bending performance test, water boiling test and ultraviolet aging performance test, and the results are shown in table 22.
TABLE 22
Figure BDA0002348756790000162
At the process temperature, the surface of an extruded sample is seriously painted, and the extruded profile can crack after the linear speed is fast.
Comparative example 5
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The components and the mass ratio in the formula table are the same as those in example 5.
(2) The parameters of the plastic-wood profile extrusion molding process are shown in table 23.
TABLE 23
Figure BDA0002348756790000171
(3) The extruded wood-plastic section is subjected to various performance tests including appearance effect, density test, bending performance test, water boiling test and ultraviolet aging performance test as shown in table 12.
Watch 24
Figure BDA0002348756790000172
At the process temperature, the surface smoothness of an extruded sample is poor, and the shaping is difficult.
Comparative example 6
Accurately weighing all formula materials in a high-low mixer (1000L/3000L) according to a formula table, placing the mixture in a low mixer when the high mixing temperature reaches 130 ℃, discharging the mixture when the temperature of the formula materials reaches 60 ℃ to obtain mixed plastic-wood formula materials, and directly extruding and molding the plastic-wood formula materials in a plastic-wood molding machine according to certain processing technological parameters to obtain the plastic-wood extruded section.
(1) The components and the mass ratio in the formula table are the same as those in example 5.
(2) The parameters of the wood-plastic profile extrusion molding process are shown in table 25.
TABLE 25
Figure BDA0002348756790000173
Figure BDA0002348756790000181
(3) The extruded wood-plastic section was subjected to various performance tests including appearance effect evaluation, density test, bending property test, water boiling test and ultraviolet aging property test as shown in table 26.
Watch 26
Figure BDA0002348756790000182
At the process temperature, the surface of an extruded sample is painted, and the extruded section can crack after the linear speed is fast.
Experimental example 1
For comparison, the formulations and processing parameters of examples 1-7 and comparative examples 1-6 are summarized in tables 27 and 28.
Watch 27
Figure BDA0002348756790000183
Figure BDA0002348756790000191
Watch 28
Figure BDA0002348756790000192
From the above examples 1, 2, 3, 4 and 5 and comparative examples 1 and 2, it can be seen that the process parameters are the same, except that the formulation composition is different. Compared with comparative examples 1-2, the plastic-wood floor board has the advantages that the proportioning effect is good, the forming formula of the example 4 is optimal, and various performances of the plastic-wood floor board product obtained by extrusion are more outstanding. Example 4 WPC140S23 Plastic Wood Profile with bending maximum force 3731.32N and bending Strength 1742MPa, flexural modulus 3608.85MPa, product density 1.326g/cm3The product is boiled in boiling water at 100 ℃ for one week (168 hours) without cracking, and is placed at 0.51W/m2In a light-intensity aging environment, the mechanical property loss of the plastic-wood product is less than or equal to 12% after 3000h, and various detection data on the plastic-wood product show that the plastic-wood product obtained by extrusion meets the outdoor use requirement of the general plastic-wood floor. The plastic-wood products, hollow plastic-wood products and solid plastic-wood products with different specifications and models can be obtained by extrusion in a forming machine of a specific screw by adopting the one-step formula composition of the patent.
From the above examples 5, 6 and 7, and comparative examples 5-6, it can be seen that the formulations of examples 5-7 are identical, differing only in the processing parameters. Compared with comparative examples 5-6, the effects of examples 5-7 of the invention are better, which shows that the processing parameters of the invention are that the temperatures of the first zone, the second zone, the third zone, the fourth zone and the confluence core of the machine barrel are 193-197 ℃, 188-192 ℃, 173-178 ℃, 163-167 ℃ and 153-157 ℃ in sequence; the temperature of the first area, the second area, the third area and the fourth area of the die is 148-152 ℃. "preferably. Temperatures outside the above range (comparative examples 5-6) were not effective; and the effect of the embodiment 5 is better than that of the embodiment 6-7, which shows that the embodiment 5 is the best embodiment, namely that the temperatures of the barrel first zone, the barrel second zone, the barrel third zone, the barrel fourth zone and the converging core are 195 ℃, 190 ℃, 175 ℃, 165 ℃ and 155 ℃ in sequence; the temperatures of the first area, the second area, the third area and the fourth area of the die are all 150 ℃, which is the best processing parameter.
It can be seen from the above example 4, comparative example 3 and comparative example 4 that, in the example 4, under the conditions of the one-step extrusion molding formula and the processing technology of the present application, each performance index of the obtained plastic-wood floor product is superior to that of the plastic-wood product obtained by directly extruding and molding the general PE plastic-wood formula. The one-step method extrusion plastic-wood product has better appearance effect, and the upper surface and the lower surface of the extrusion section are smooth without the phenomenon of flower skin on the surface; the extrusion linear speed of the molded extrusion plastic-wood profile is faster, wherein the linear speed of the solid extrusion profile WPC140S23 reaches 0.42 m/min; the density is higher, and the compactness of the cross section of the profile is better;the mechanical property of the extruded profile is more outstanding, and the maximum force, bending strength and bending modulus value are higher; the extruded section passes a water boiling test, and after being boiled in boiling water at 100 ℃ for 168 hours, the plastic-wood section does not crack; the ultraviolet aging resistance of the extruded plastic-wood profile is more outstanding and is 0.51W/m2Under the light intensity, the mechanical property loss of the plastic-wood floor is less than or equal to 12 percent within 3000 hours.
The invention is not to be considered as limited to the particular embodiments shown, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. The extrusion molding formula for PE plastic wood granulation-free is characterized by comprising the following components in percentage by weight: 20-30% of HDPE plastic particles, 63-72% of filler, 2-3.7% of lubricant, 1.5-3% of compatilizer, 0.4-0.8% of functional assistant and 1.3-3.2% of pigment; the filler comprises rice bran powder, wood powder and talcum powder.
2. The extrusion molding formula for PE plastic wood granulation-free according to claim 1, wherein the filler comprises 32-43 parts by weight of rice bran powder, 8-26 parts by weight of wood powder and 13 parts by weight of talcum powder.
3. The extrusion molding formula for PE plastic wood granulation-free according to claim 1, wherein the HDPE pellet has a diameter of 5 +/-0.5 mm, a melt index of 3-4 and an ash content of 2-3%.
4. The pelletization-free extrusion molding formulation for PE wood-plastic according to claim 1, wherein the lubricant comprises a stearate.
5. The extrusion molding formula for PE plastic wood granulation-free according to claim 1, wherein the compatilizer is maleic anhydride grafted polyolefin, the melt index of the compatilizer is 1.5-2.5 g/10min, and the grafting ratio is 0.6-0.8 wt%.
6. The extrusion molding method for PE plastic wood without granulation is characterized by comprising the following steps:
step 1, weighing the raw materials in the formula of any one of claims 1 to 5, plasticizing and mixing the raw materials at the temperature of 130-140 ℃ for a period of time, and cooling the mixture to below 60 ℃ to obtain a mixed plastic-wood formula material;
and 2, directly extruding and molding the plastic-wood formula material obtained in the step 1 in a plastic-wood molding machine according to certain processing parameters to obtain the plastic-wood extruded section.
7. The method of claim 6, wherein the mixing in step 1 is performed using a high-low mixer.
8. The method of claim 6, wherein the processing parameters of step 2 include:
the temperature of a first zone, a second zone, a third zone, a fourth zone and a confluence core of a machine barrel in the plastic-wood forming machine station is 193-197 ℃, 188-192 ℃, 173-178 ℃, 163-167 ℃ and 153-157 ℃ in sequence;
the temperature of a first area, a second area, a third area and a fourth area of the die in the plastic-wood forming machine table is 148-152 ℃.
9. The method of claim 6, wherein the processing parameters of step 2 include:
the temperatures of a first zone, a second zone, a third zone, a fourth zone and a confluence core of a machine barrel in the plastic-wood forming machine station are 195 ℃, 190 ℃, 175 ℃, 165 ℃ and 155 ℃ in sequence;
the temperature of the first area, the second area, the third area and the fourth area of the die in the plastic-wood forming machine table is 150 ℃.
CN201911406424.7A 2019-12-31 2019-12-31 Extrusion molding formula and molding method for PE plastic wood without granulation Pending CN111171591A (en)

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Application publication date: 20200519