CN114044958A - Preparation method of colored plant fiber composite material - Google Patents

Preparation method of colored plant fiber composite material Download PDF

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CN114044958A
CN114044958A CN202111390721.4A CN202111390721A CN114044958A CN 114044958 A CN114044958 A CN 114044958A CN 202111390721 A CN202111390721 A CN 202111390721A CN 114044958 A CN114044958 A CN 114044958A
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composite material
mixing
pigment
polyethylene
blend
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张效林
吕金燕
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Xian University of Technology
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Xian University of Technology
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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
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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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  • Health & Medical Sciences (AREA)
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  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
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Abstract

The invention discloses a preparation method of a colored plant fiber composite material, which comprises the following steps: step 1, respectively drying iron oxide red pigment, organic red pigment, titanium white pigment, carbon black pigment, wood powder, high-density polyethylene, polyethylene wax, maleic anhydride grafted polyethylene and paraffin in an oven; putting the dried wood powder, high-density polyethylene, polyethylene wax, maleic anhydride grafted polyethylene and paraffin wax and iron red pigment, organic red pigment, titanium white pigment and carbon black pigment into a mixing roll respectively for melting and mixing to obtain blends respectively; and then crushing to obtain a granular composite material, drying the granular composite material in an oven, and then performing injection molding to obtain the plant fiber composite materials with different colors. The pigment is uniformly dispersed in the composite material, the colored composite material has uniform color, the requirement of preparing the composite material with different colors is met, and the preparation process is simple.

Description

Preparation method of colored plant fiber composite material
Technical Field
The invention belongs to the technical field of composite material coloring processes, and relates to a preparation method of a colored plant fiber composite material.
Background
As the area of petroleum resources and forests has decreased, wood-plastic composites have become widely used as an ideal substitute for wood, and the use of non-renewable (petroleum-based) resources has decreased throughout the life cycle of the composite. The wood-plastic composite material is mainly manufactured by extrusion and injection molding processes, has the characteristics of good strength, special aesthetic property and easiness in processing, is low in cost and easy to recover, and is widely applied to the industries such as building industry, outdoor landscape, municipal engineering, 3D printing and the like.
The wide application range has more requirements on the appearance of the composite material, and the plant fiber made into the composite material has some chromophores and auxiliary color groups, and some high-temperature processing processes can also cause the color of the composite material to be dark, so that the finished composite material has some specific colors, but the finished composite material has single color and uneven surface color, the original surface of the composite material has poor aesthetic property, and the problem of simply, conveniently and safely improving the aesthetic degree of the composite material needs to be considered at present.
The added pigment has the functions of decoration and protection on the composite material, and the pigment is mainly divided into organic pigment and inorganic pigment, has stable physical property and chemical property, and has good covering power and coloring performance. The surface appearance of the composite material can be improved by adding the pigment, the current situation that the existing composite material is single in color is improved, and the pigment can be used as a physical protective agent to have good effects on light fastness and weather resistance of the composite material due to the special optical property of the pigment, so that the method is very important for uniformly dispersing the pigment in the composite material and realizing uniform coloring, but at present, research on how to uniformly disperse the pigment in the composite material and prepare the colored plant fiber composite material with uniform color and high color fastness is less.
Disclosure of Invention
The invention aims to provide a preparation method of a colored plant fiber composite material, which is characterized in that pigment is uniformly dispersed in the composite material, the colored composite material has uniform color, the requirement of preparing composite materials with different colors is met, and the preparation process is simple.
The technical scheme adopted by the invention is that the preparation method of the colored plant fiber composite material is implemented according to the following steps:
step 1, respectively drying iron oxide red pigment, organic red pigment, titanium white pigment, carbon black pigment, wood powder, high-density polyethylene, polyethylene wax, maleic anhydride grafted polyethylene and paraffin in an oven;
step 2, respectively putting the dried wood powder, the high-density polyethylene, the polyethylene wax, the maleic anhydride grafted polyethylene and the paraffin wax and iron red pigment, organic red pigment, titanium white pigment and carbon black pigment into a mixing roll for melting and mixing to respectively obtain a blend a, a blend b, a blend c and a blend d;
step 3, crushing the blend a or the blend b or the blend c or the blend d obtained in the step 2 to obtain a granular composite material, and then putting the granular composite material into an oven for drying;
and 4, performing injection molding on the composite material dried in the step 3, and obtaining a standard sample after cooling and demolding to obtain the plant fiber composite material with different colors.
The present invention is also characterized in that,
in the step 1, the addition amounts of the wood powder, the polyethylene wax, the maleic anhydride grafted polyethylene and the paraffin wax are respectively 40 +/-1%, 1 +/-0.2%, 3 +/-0.2% and 1 +/-0.2% of the prepared plant fiber composite material, the addition amount of the iron oxide red pigment or the organic red pigment or the titanium white pigment or the carbon black pigment is 1 +/-0.2% or 3 +/-0.2% or 5 +/-0.2% of the prepared plant fiber composite material, and the balance is the high-density polyethylene.
The drying temperature in the step 1 is 50-80 ℃, and the drying time is 8-10 h.
The mixing in the step 2 specifically comprises the following steps: melting high-density polyethylene in a mixing roll, after the high-density polyethylene is changed into a transparent sticky state from a granular state, adding maleic anhydride grafted polyethylene for mixing, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin wax and wood flour for mixing for a certain time, then uniformly mixing iron oxide red pigment or organic red pigment or titanium white pigment or carbon black pigment and polyethylene wax, and then putting the mixture into the mixing roll for mixing, wherein the mixing temperature in the mixing process is 165 ℃, and the total mixing time is 5-10 min.
And 3, crushing the blend by using a crusher for 60-90s to obtain the granular composite material.
And (3) drying the granular composite material in the oven for 8-10h at the drying temperature of 50-80 ℃.
And 4, the injection temperature in the step 4 is 165 ℃, the injection pressure is 98bar, the pressure maintaining pressure in the injection process is 30 +/-2 bar, and the pressure maintaining time is 1 s.
The invention has the beneficial effects that:
(1) the invention relates to a preparation method of a colored plant fiber composite material, which comprises the steps of drying iron oxide red or organic red or carbon black or titanium white and wood powder, high-density polyethylene, polyethylene wax, maleic anhydride grafted polyethylene and paraffin in an oven, mixing, melting and mixing for 5-10min, scraping the mixed material to obtain a colored blend, crushing the colored blend by using a crusher to obtain colored blend particles, drying again, and finally preparing the colored composite material by adopting an injection molding method.
(2) The invention carries out coloring treatment on the composite material by adding the pigment, and prepares the colored composite material, thereby obtaining the composite material with uniform color and good color fastness, and meeting the diversity requirements of the composite material in various use approaches.
Drawings
FIG. 1 is a lightness diagram of iron red colored plant fiber composites prepared in examples 1-3 of the present invention;
FIG. 2 is a graph of red-green color quality of iron red colored plant fiber composites prepared in examples 1-3 of the present invention;
FIG. 3 is a graph of the yellow-blue merit values of iron red colored plant fiber composites prepared in examples 1-3 of the present invention;
FIG. 4 is a chromaticity diagram of iron red colored plant fiber composites prepared in examples 1-3 of the present invention;
FIG. 5 is a color difference plot of iron red colored plant fiber composites prepared in examples 1-3 of the present invention;
FIG. 6 is a lightness graph of an organic red colored plant fiber composite prepared in examples 4-6 of the present invention;
FIG. 7 is a graph of red-green color quality of organic red-colored plant fiber composites prepared in examples 4-6 of the present invention;
FIG. 8 is a graph of the yellow-blue merit values of organic red colored plant fiber composites prepared in examples 4-6 of the present invention;
FIG. 9 is a graph of the chroma of organic red colored plant fiber composites prepared in examples 4-6 of the present invention;
FIG. 10 is a color difference plot of organic red colored plant fiber composites prepared in examples 4-6 of the present invention;
FIG. 11 is a brightness graph of titanium white colored plant fiber composites prepared according to examples 7-9 of the present invention;
FIG. 12 is a graph of red and green merit values for titanium white colored plant fiber composites prepared in examples 7-9 of the present invention;
FIG. 13 is a graph of the yellow-blue merit for titanium white colored plant fiber composites prepared in examples 7-9 of the present invention;
FIG. 14 is a chromaticity diagram of titanium white colored plant fiber composites prepared in examples 7-9 of the present invention;
FIG. 15 is a color difference plot of titanium white colored plant fiber composites made in examples 7-9 of the present invention;
FIG. 16 is a lightness graph of carbon black colored plant fiber composites prepared according to examples 10-12 of the present invention;
FIG. 17 is a graph of the red-green chroma values of carbon black colored plant fiber composites prepared in examples 10-12 of the present invention;
FIG. 18 is a graph of the yellow-blue merit values of carbon black colored plant fiber composites prepared in examples 10-12 of the present invention;
FIG. 19 is a plot of the chroma of carbon black colored plant fiber composites prepared in examples 10-12 of the present invention;
FIG. 20 is a color difference plot of carbon black colored plant fiber composites prepared in examples 10-12 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a preparation method of a colored plant fiber composite material, which is implemented according to the following steps:
step 1, drying iron oxide red pigment, organic red pigment, titanium white pigment, carbon black pigment, wood powder, high-density polyethylene, polyethylene wax, maleic anhydride grafted polyethylene and paraffin in an oven at the drying temperature of 50-80 ℃ for 8-10 h; wherein the addition amounts of the wood flour, the polyethylene wax, the maleic anhydride grafted polyethylene and the paraffin are respectively 40 plus or minus 1%, 1 plus or minus 0.2%, 3 plus or minus 0.2% and 1 plus or minus 0.2% of the prepared plant fiber composite material, the addition amount of the iron oxide red pigment or the organic red pigment or the titanium white pigment or the carbon black pigment is 1 plus or minus 0.2% or 3 plus or minus 0.2% or 5 plus or minus 0.2% of the prepared plant fiber composite material, and the balance is the high-density polyethylene;
step 2, respectively putting the dried wood powder, the high-density polyethylene, the polyethylene wax, the maleic anhydride grafted polyethylene and the paraffin wax and iron red pigment, organic red pigment, titanium white pigment and carbon black pigment into a mixing roll for melting and mixing to respectively obtain a blend a, a blend b, a blend c and a blend d;
the mixing method specifically comprises the following steps: melting high-density polyethylene in a mixing roll, after the high-density polyethylene is changed into a transparent sticky state from a granular state, adding maleic anhydride grafted polyethylene for mixing, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin wax and wood flour for mixing for a certain time, then uniformly mixing iron oxide red pigment or organic red pigment or titanium white pigment or carbon black pigment and polyethylene wax, and then putting the mixture into the mixing roll for mixing, wherein the mixing temperature in the mixing process is 165 ℃, and the total mixing time is 5-10 min.
Step 3, crushing the blend a or the blend b or the blend c or the blend d obtained in the step 2 by using a crusher for 60-90s to obtain a granular composite material, and then drying the granular composite material in an oven at 50-80 ℃ for 8-10 h;
and 4, performing injection molding on the composite material dried in the step 3 at the injection temperature of 165 ℃ under the injection pressure of 98bar, keeping the pressure during injection at 30 +/-2 bar for 1s, and cooling and demolding to obtain a standard sample so as to obtain the plant fiber composite material with different colors.
The high density polyethylene of the present invention was 0.956 density polyethylene produced by the company Dushan of Xinjiang.
The maleic anhydride-grafted polyethylene of the present invention is a product produced by exxon Mobil.
In order to verify the effect of the invention, four compositions are adopted, specifically:
the formula 1 is as follows:
the high-density polyethylene is used as a resin matrix, the wood powder is used as a reinforcement, the maleic anhydride grafted polyethylene is used as a modifier, and the polyethylene wax and the paraffin are respectively used as a dispersing aid and a lubricating aid.
And (2) formula:
the iron oxide red is pigment, the high-density polyethylene is resin matrix, the wood powder is reinforcement, the maleic anhydride grafted polyethylene is modifier, and the polyethylene wax and the paraffin wax are respectively dispersing aid and lubricating aid.
And (3) formula:
the organic red is pigment, the high-density polyethylene is resin matrix, the wood powder is reinforcement, the maleic anhydride grafted polyethylene is modifier, and the polyethylene wax and the paraffin wax are respectively dispersing aid and lubricating aid.
And (4) formula:
titanium dioxide is used as pigment, high-density polyethylene is used as resin matrix, wood powder is used as reinforcement, maleic anhydride grafted polyethylene is used as modifier, and polyethylene wax and paraffin wax are respectively used as dispersing aid and lubricating aid.
And (5) formula:
the carbon black is pigment, the high-density polyethylene is resin matrix, the wood flour is reinforcement, the maleic anhydride grafted polyethylene is modifier, and the polyethylene wax and the paraffin wax are respectively dispersing aid and lubricating aid.
Example 1
The preparation method of the iron oxide red coloring composite material is implemented according to the following steps:
step 1, weighing 80g of wood powder, 108g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 2g of iron oxide red, placing in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; weighing 2g of polyethylene wax and 2g of paraffin wax, and placing the polyethylene wax and the paraffin wax in an oven for drying, wherein the drying temperature is 50 ℃, and the drying time is 8 hours;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 54%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of iron oxide red pigment is 1%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the iron red colored composite material.
As shown in fig. 1-5, the composite material without pigment addition has L, a, b, and Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 1ab36.61, 31.28, 29.54, 43.04 respectively, the color difference of example 2 with the composite without added pigment was 20.22.
Example 2
A preparation method of a composite material colored with iron oxide red comprises the following steps:
step 1, weighing 80g of wood powder, 104g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 6g of iron oxide red, and placing the materials in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; weighing 2g of polyethylene wax and 2g of paraffin wax, and placing the polyethylene wax and the paraffin wax in an oven for drying, wherein the drying temperature is 50 ℃, and the drying time is 8 hours;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 52%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of iron oxide red pigment is 3%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the iron red colored composite material.
As shown in fig. 1-5, the composite material without pigment addition has L, a, b, and Cab36.67, 4.30, 12.38, 47.56, L, a, b, C of the composite material prepared in example 2ab37.52, 34.34, 32.91, 43.04 respectively, and the color difference between example 2 and example 1 is 8.26.
Example 3
The preparation method of the iron oxide red coloring composite material is implemented according to the following steps:
step 1, weighing 80g of wood powder, 100g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 10g of iron oxide red, placing in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; weighing 2g of polyethylene wax and 2g of paraffin wax, and placing the polyethylene wax and the paraffin wax in an oven for drying, wherein the drying temperature is 50 ℃, and the drying time is 8 hours;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 50%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of iron oxide red pigment is 5%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the iron red colored composite material.
As shown in fig. 1-5, the composite material without pigment addition has L, a, b, and Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 2ab37.27, 34.20, 32.77, 47.39, example 3 and realms, respectivelyThe color difference of example 2 was 1.27. Therefore, the color of the composite material added with 5% of iron oxide red is not greatly different from that of the composite material added with 3% of iron oxide red, and the adding proportion of the iron oxide red is 3% based on the comprehensive consideration of the surface color change and the economic cost.
Example 4
A preparation method of an organic red coloring composite material is implemented according to the following steps:
step 1, weighing 80g of wood powder, 108g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 2g of organic red, placing in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; weighing 2g of polyethylene wax and 2g of paraffin wax, and placing the polyethylene wax and the paraffin wax in an oven for drying, wherein the drying temperature is 50 ℃, and the drying time is 8 hours;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 54%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of organic red pigment is 1%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the organic red colored composite material.
As shown in FIGS. 6-10, the composite material without pigment addition has L, a, b, Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 4ab36.27, 47.44, 32.14, 57.32, respectively, the color difference of example 4 from the unpigmented composite was 47.45.
Example 5
A preparation method of an organic red coloring composite material is implemented according to the following steps:
step 1, weighing 80g of wood powder, 104g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 6g of organic red, placing in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; in addition, 2g of polyethylene wax and 2g of paraffin wax are weighed for later use;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 52%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of organic red pigment is 3%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the organic red colored composite material.
As shown in FIGS. 6-10, the composite material without pigment addition has L, a, b, Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 5ab39.83, 58.03, 43.41 and 72.49 respectively, and the color difference between example 5 and example 4 is 15.87.
Example 6
A preparation method of an organic red coloring composite material is implemented according to the following steps:
step 1, weighing 80g of wood powder, 100g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 10g of iron oxide red, placing in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; weighing 2g of polyethylene wax and 2g of paraffin wax, and placing the polyethylene wax and the paraffin wax in an oven for drying, wherein the drying temperature is 50 ℃, and the drying time is 8 hours;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 50%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of organic red pigment is 5%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the organic red colored composite material.
As shown in FIGS. 6-10, the composite material without pigment addition has L, a, b, Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 6ab40.64, 59.58, 44.87, 74.59, respectively, the color difference between example 6 and example 5 was 2.28. Therefore, the color of the composite material added with 5% of organic red is not greatly different from that of the composite material added with 3% of organic red, and the adding proportion of the organic red pigment is selected to be 3% based on the comprehensive consideration of the surface color change and the economic cost.
Example 7
A preparation method of a titanium white coloring composite material is specifically implemented according to the following steps:
step 1, weighing 80g of wood powder, 108g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 2g of titanium dioxide, and placing the materials in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; weighing 2g of polyethylene wax and 2g of paraffin wax, and placing the polyethylene wax and the paraffin wax in an oven for drying, wherein the drying temperature is 50 ℃, and the drying time is 8 hours;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 54%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of titanium dioxide pigment is 1%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the iron red colored composite material.
As shown in FIGS. 11-15, the composite material without pigment addition has L, a, b, Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 6ab64.38, 2.98, 12.59, 12.94, respectively, and the color difference of example 7 from the unpigmented composite was 39.58.
Example 8
A preparation method of a titanium white coloring composite material is specifically implemented according to the following steps:
step 1, weighing 80g of wood powder, 104g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 6g of titanium dioxide, and placing the materials in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; in addition, 2g of polyethylene wax and 2g of paraffin wax are weighed for later use;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 52%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of titanium dioxide pigment is 3%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the titanium white colored composite material.
As shown in FIGS. 11-15, the composite material without pigment addition has L, a, b, Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 7ab74.47, 2.50, 11.71 and 11.97 respectively, and the color difference between example 8 and example 7 is 10.15.
Example 9
A preparation method of a titanium white coloring composite material is specifically implemented according to the following steps:
step 1, weighing 80g of wood powder, 100g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 10g of titanium dioxide, and placing the materials in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; weighing 2g of polyethylene wax and 2g of paraffin wax, and placing the polyethylene wax and the paraffin wax in an oven for drying, wherein the drying temperature is 50 ℃, and the drying time is 8 hours;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 50%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of titanium dioxide pigment is 5%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the organic red colored composite material.
As shown in FIGS. 11-15, the composite material without pigment addition has L, a, b, Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 9ab78.78, 1.83, 9.74, 9.91, respectively, the color difference between example 9 and example 8 was 4.78. Therefore, the color of the composite material added with 5 percent of titanium dioxide is not greatly different from that of the composite material added with 3 percent of titanium dioxide, and the adding proportion of the titanium dioxide pigment is selected to be 3 percent based on the comprehensive consideration of the surface color change and the economic cost.
Example 10
A preparation method of a carbon black coloring composite material is implemented according to the following steps:
step 1, weighing 80g of wood powder, 108g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 2g of carbon black, placing in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; weighing 2g of polyethylene wax and 2g of paraffin wax, and placing the polyethylene wax and the paraffin wax in an oven for drying, wherein the drying temperature is 50 ℃, and the drying time is 8 hours;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 54%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of carbon black pigment is 1%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the carbon black colored composite material.
As shown in fig. 16-20, the composite material without added pigment has L, a, b, Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 10ab21.12, -0.14, 0.30, 0.44, respectively, and the color difference of example 10 from the unpigmented composite was 20.22.
Example 11
A preparation method of a carbon black coloring composite material is implemented according to the following steps:
step 1, weighing 80g of wood powder, 104g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 6g of titanium dioxide, and placing the materials in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; in addition, 2g of polyethylene wax and 2g of paraffin wax are weighed for later use;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 52%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of carbon black pigment is 3%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the titanium white colored composite material.
As shown in fig. 16-20, the composite material without added pigment has L, a, b, Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 11ab12.92, -0.53, -0.70, 1.32, respectively, the color difference between example 11 and example 10 is 8.26.
Example 12
A preparation method of a carbon black coloring composite material is implemented according to the following steps:
step 1, weighing 80g of wood powder, 100g of high-density polyethylene, 6g of maleic anhydride grafted polyethylene and 10g of carbon black, placing in an oven for drying, wherein the drying time is 8 hours, and the drying temperature is 80 ℃; weighing 2g of polyethylene wax and 2g of paraffin wax, and placing the polyethylene wax and the paraffin wax in an oven for drying, wherein the drying temperature is 50 ℃, and the drying time is 8 hours;
step 2, putting the weighed high-density polyethylene into a mixing roll for melting for 2min, after the high-density polyethylene is changed into a transparent sticky shape from a granular shape, putting the weighed maleic anhydride grafted polyethylene for mixing for 1min, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin for mixing for 30s, adding wood flour for mixing for 5min, uniformly mixing the pigment and the polyethylene wax, and putting the mixture into the mixing roll for mixing for 2 min; the mixing temperature is 165 ℃, and the blend is scraped for later use after being mixed uniformly; in the blend, the mass fraction of wood flour is 40%, the mass fraction of high-density polyethylene is 50%, the mass fraction of maleic anhydride grafted polyethylene is 3%, the mass fraction of polyethylene wax is 1%, the mass fraction of paraffin is 1%, and the mass fraction of carbon black pigment is 5%;
step 3, crushing the blend to obtain a granular composite material, wherein the crushing time is 60-90 s;
step 4, drying the crushed composite material for 8-10h at the drying temperature of 80 ℃;
and 5, performing injection molding on the dried composite material at the injection molding temperature of 165 ℃ under the injection molding pressure of 98bar, and taking out the standard sample after demolding and cooling to obtain the organic red colored composite material.
As shown in fig. 16-20, the composite material without added pigment has L, a, b, Cab36.67, 4.30, 12.38, 13.10, L, a, b, C of the composite material prepared in example 12ab11.68, -0.58, -0.95 and 1.24 respectively, and the color difference between the example 12 and the example 11 is 1.27. Therefore, the color of the composite material added with 5 percent of carbon black is not greatly different from that of the composite material added with 3 percent of carbon black, and the adding proportion of the carbon black pigment is selected to be 3 percent based on the comprehensive consideration of the surface color change and the economic cost.
The action mechanism of the invention is as follows: pigment particles with different chromophores and color-assisting groups are added, a dispersing auxiliary agent and a lubricating auxiliary agent are used for uniformly dispersing the pigment in the composite material, and the composite material is colored by adopting an injection molding process technology, so that the plant fiber composite material can selectively absorb light with different wavelengths, and the colorful plant fiber composite material with bright color and high glossiness is obtained.

Claims (7)

1. The preparation method of the colored plant fiber composite material is characterized by comprising the following steps:
step 1, respectively drying iron oxide red pigment, organic red pigment, titanium white pigment, carbon black pigment, wood powder, high-density polyethylene, polyethylene wax, maleic anhydride grafted polyethylene and paraffin in an oven;
step 2, respectively putting the dried wood powder, the high-density polyethylene, the polyethylene wax, the maleic anhydride grafted polyethylene and the paraffin wax and iron red pigment, organic red pigment, titanium white pigment and carbon black pigment into a mixing roll for melting and mixing to respectively obtain a blend a, a blend b, a blend c and a blend d;
step 3, crushing the blend a or the blend b or the blend c or the blend d obtained in the step 2 to obtain a granular composite material, and then putting the granular composite material into an oven for drying;
and 4, performing injection molding on the composite material dried in the step 3, and obtaining a standard sample after cooling and demolding to obtain the plant fiber composite material with different colors.
2. The method of claim 1, wherein the wood flour, the polyethylene wax, the maleic anhydride grafted polyethylene and the paraffin wax are added in the amount of 40 ± 1%, 1 ± 0.2%, 3 ± 0.2% and 1 ± 0.2% of the prepared plant fiber composite material in step 1, the iron red pigment or the organic red pigment or the titanium white pigment or the carbon black pigment is added in the amount of 1 ± 0.2% or 3 ± 0.2% or 5 ± 0.2% of the prepared plant fiber composite material, and the balance is high density polyethylene.
3. The method for preparing a colored plant fiber composite material according to claim 2, wherein the drying temperature in the step 1 is 50-80 ℃ and the drying time is 8-10 h.
4. The method for preparing the colored plant fiber composite material according to claim 3, wherein the mixing in the step 2 specifically comprises: melting high-density polyethylene in a mixing roll, after the high-density polyethylene is changed into a transparent sticky state from a granular state, adding maleic anhydride grafted polyethylene for mixing, fully mixing the high-density polyethylene and the maleic anhydride grafted polyethylene, adding paraffin wax and wood flour for mixing for a certain time, then uniformly mixing iron oxide red pigment or organic red pigment or titanium white pigment or carbon black pigment and polyethylene wax, and then putting the mixture into the mixing roll for mixing, wherein the mixing temperature in the mixing process is 165 ℃, and the total mixing time is 5-10 min.
5. The method for preparing a colored plant fiber composite material as claimed in claim 4, wherein the blend is pulverized in the step 3 by a pulverizer for 60-90s to obtain a granular composite material.
6. The method for preparing the colored plant fiber composite material as claimed in claim 5, wherein the drying time of the granular composite material in the step 3 in the oven is 8-10h, and the drying temperature is 50-80 ℃.
7. The method for preparing a colored plant fiber composite material according to claim 6, wherein the injection temperature in step 4 is 165 ℃, the injection pressure is 98bar, the dwell pressure during injection is 30 ± 2bar, and the dwell time is 1 s.
CN202111390721.4A 2021-11-22 2021-11-22 Preparation method of colored plant fiber composite material Pending CN114044958A (en)

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Publication number Priority date Publication date Assignee Title
US20040076847A1 (en) * 2002-10-17 2004-04-22 Saunders Howard E. Colored wood/polymer composites
EP1623809A1 (en) * 2004-08-03 2006-02-08 Deceuninck NV Coloured polymer-wood composite materials, a process for making and structural members obtained thereof
CN102942797A (en) * 2012-10-17 2013-02-27 广西大学 Plant fiber wood-plastic composite material and preparation method thereof
CN103351632A (en) * 2013-06-20 2013-10-16 黄山华塑新材料科技有限公司 Anti-termite-type wood plastic composite material and preparation process therefor
CN104710806A (en) * 2013-12-14 2015-06-17 锦州绿岛生态科技有限责任公司 Wood-plastic composite material, and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040076847A1 (en) * 2002-10-17 2004-04-22 Saunders Howard E. Colored wood/polymer composites
EP1623809A1 (en) * 2004-08-03 2006-02-08 Deceuninck NV Coloured polymer-wood composite materials, a process for making and structural members obtained thereof
CN102942797A (en) * 2012-10-17 2013-02-27 广西大学 Plant fiber wood-plastic composite material and preparation method thereof
CN103351632A (en) * 2013-06-20 2013-10-16 黄山华塑新材料科技有限公司 Anti-termite-type wood plastic composite material and preparation process therefor
CN104710806A (en) * 2013-12-14 2015-06-17 锦州绿岛生态科技有限责任公司 Wood-plastic composite material, and preparation method thereof

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