CN109021352B - Method for preparing composite material based on wheat straw fiber surface treatment - Google Patents
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- 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
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Abstract
The invention discloses a method for preparing a composite material based on wheat straw fiber surface treatment, which comprises the following steps of 1, performing wheat straw fiber surface treatment, preparing a treatment solution, treating wheat straw fibers with the treatment solution, cleaning the treated wheat straw fibers, and drying the cleaned wheat straw fibers; step 2, mixing, namely crushing the wheat straw fibers obtained in the step 2 to 50-60 meshes, crushing the high-density polyethylene to 2-6 meshes, weighing the wheat straw fibers and the high-density polyethylene according to a proportion, and mixing in a mixer to obtain a blend; and 3, injection molding, namely crushing the blend obtained in the step 3 to 2-6 meshes, drying the blend until the water content is below 3%, and placing the blend in an injection molding machine for injection molding to obtain the composite material. The composite material prepared from the wheat straw fiber subjected to the composite treatment of the xylanase, the lipase and the coupling agent A-172 has the best performance, the surface treatment method solves the problem of poor compatibility of the wheat straw fiber and the matrix high-density polyethylene, and the overall performance of the composite material is improved.
Description
Technical Field
The invention belongs to the technical field of fiber reinforced composite material preparation, and particularly relates to a method for preparing a composite material based on wheat straw fiber surface treatment.
Background
The plant fiber reinforced thermoplastic plastic composite material is a green environment-friendly composite material, is prepared by hot pressing, extruding or injecting plant fibers and thermoplastic plastics, and has good corrosion resistance, ageing resistance, low water absorption, easy processing and forming and degradability. The wood-plastic composite board is widely applied to the fields of buildings, furniture and packaging transportation, can replace wood, and saves wood resources. However, since the plant fiber is a polar molecule and contains a large amount of polar functional groups, and the thermoplastic is a non-polar molecule, although the blended body can be achieved through the molten state of the thermoplastic in high-temperature blending, a microscopic observation shows that a clear boundary exists between the plant fiber and the thermoplastic, so that the performance of the composite material cannot meet the requirement.
Disclosure of Invention
The invention aims to provide a method for preparing a composite material based on wheat straw fiber surface treatment, which solves the problem that the performance of the composite material cannot meet the requirement due to poor compatibility of a plant fiber reinforced plastic composite material in the prior art.
The technical scheme adopted by the invention is that the method for preparing the composite material based on the surface treatment of the wheat straw fiber comprises the steps of carrying out surface treatment on the wheat straw fiber, mixing the treated wheat straw fiber and high-density polyethylene in a mixing roll to obtain a blend, and placing the blend into an injection molding machine for injection molding to obtain the composite material.
The invention is also characterized in that:
the method is implemented according to the following steps:
step 1, performing surface treatment on wheat straw fibers, preparing a treatment solution, treating the wheat straw fibers with the treatment solution, and cleaning and drying the treated wheat straw fibers;
step 2, mixing, namely crushing the wheat straw fibers obtained in the step 1 to 50-60 meshes, crushing the high-density polyethylene to 2-6 meshes, weighing the wheat straw fibers and the high-density polyethylene according to a proportion, and mixing in a mixer to obtain a blend;
and 3, injection molding, namely crushing the blend obtained in the step 2 to 2-6 meshes, drying the blend until the water content is below 3%, and placing the blend in an injection molding machine for injection molding to obtain the composite material.
The step 1 is implemented according to the following steps:
step 1.1, preparing a wheat straw fiber treatment solution, preparing a buffer solution with the pH value of 4.5-6.5 by using deionized water, citric acid and sodium citrate, heating the buffer solution to 40-50 ℃, keeping the temperature constant, weighing a treatment agent, adding the treatment agent into the buffer solution, and stirring to uniformly mix the treatment agent and the buffer solution;
step 1.2, treating the wheat straw fibers, weighing the wheat straw fibers with the water content of less than 3 percent, adding the wheat straw fibers into the wheat straw fiber treatment solution obtained in the step 1.1, and treating for 4.5-5.5 hours;
Step 1.3, cleaning, namely placing the wheat straw fibers obtained by the treatment in the step 1.2 on a 200-mesh sieve, and repeatedly cleaning with deionized water until the pH value of the supernatant of the cleaning solution is 6.5-7.5;
and step 1.4, drying, namely drying the wheat straw fiber obtained in the step 1.3 until the water content is below 3%.
The treating agent in the step 1.1 is specifically xylanase, and the mass ratio of the buffer solution in the step 1.1, the xylanase and the wheat straw fiber in the step 1.2 is (1000-2000): (0.1-1.0): (60-100) in sequence.
The treating agent in the step 1.1 is lipase, and the mass ratio of the buffer solution and the lipase in the step 1.1 to the wheat straw fiber in the step 1.2 is (1000-2000): (0.5-1.5): (60-100) in sequence.
The specific process of the step 1 is as follows:
weighing a coupling agent A-172, dissolving in a certain amount of absolute ethyl alcohol, and stirring to uniformly mix the coupling agent A-172 to obtain a treatment solution; uniformly spraying the treatment solution on the surface of the wheat straw fiber with the water content of less than 3% to ensure that the treatment solution is fully contacted with the wheat straw fiber; drying the treated wheat straw fiber until the water content is below 3%; wherein the mass ratio of the absolute ethyl alcohol, the coupling agent A-172 and the wheat straw fiber is (600-1000): (2-4):100 in sequence.
The specific process of the step 1 is as follows:
1.1, treating wheat straw fibers with xylanase, preparing a buffer solution a with the pH value of 4.5-6.5 by using deionized water, citric acid and sodium citrate, putting the buffer solution a into a digital display constant-temperature water bath kettle, heating to 40-50 ℃, and keeping the constant temperature; weighing xylanase, adding the xylanase into the buffer solution a, and stirring to uniformly mix the xylanase and the buffer solution a to obtain a treatment solution a; weighing wheat straw fibers with the water content of less than 3%, adding the wheat straw fibers into the treatment liquid a, and treating for 4.5-5.5 hours; taking out the treated wheat straw fibers, placing the wheat straw fibers on a 200-mesh sieve, and repeatedly cleaning the wheat straw fibers with deionized water until the pH value of the supernatant of the cleaning solution is 6.5-7.5; drying the washed wheat straw fiber until the water content is below 3%; wherein the mass ratio of the buffer solution a to the xylanase to the wheat straw fiber is (1000-2000): (0.1-1.0): (60-100) in sequence;
step 1.2, treating wheat straw fibers with lipase, preparing a buffer solution b with the pH value of 4.5-6.5 by using deionized water, citric acid and sodium citrate, putting the buffer solution b into a digital display constant temperature water bath, heating to 40-50 ℃, and keeping the constant temperature; weighing lipase, adding the lipase into the buffer solution b, and stirring to uniformly mix the lipase and the buffer solution b to obtain a treatment solution b; weighing the wheat straw fibers treated in the step 1.1, adding the wheat straw fibers into the treatment liquid b, and treating for 4.5-5.5 hours; taking out the treated wheat straw fibers, placing the wheat straw fibers on a 200-mesh sieve, and repeatedly cleaning the wheat straw fibers with deionized water until the pH value of the supernatant of the obtained cleaning solution is 6.5-7.5; drying the washed wheat straw fiber in a vacuum drying oven until the water content is below 3%; wherein the mass ratio of the buffer solution b, the lipase and the wheat straw fiber is (1000-2000): (0.5-1.5): (60-100) in sequence;
Step 1.3, treating the wheat straw fibers by using a coupling agent A-172, weighing the coupling agent A-172, dissolving the coupling agent A-172 in absolute ethyl alcohol, and stirring to uniformly mix the coupling agent A-172 and the absolute ethyl alcohol to obtain a treatment solution c; uniformly spraying the treatment solution c on the surface of the wheat straw fiber treated in the step 1.2 to ensure that the treatment solution is fully contacted with the wheat straw fiber; drying the treated wheat straw fiber until the water content is below 3%; wherein the mass ratio of the absolute ethyl alcohol, the coupling agent A-172 and the wheat straw fiber is (600-1000): (2-4):100 in sequence.
In the step 2, the mass ratio of the high-density polyethylene to the wheat straw fiber is 30% to 70%, the mixing temperature is 150-.
In the step 3, the injection molding temperature is 150 +/-2 ℃, and the injection molding pressure is 100 bar.
The invention has the beneficial effects that:
according to the method for preparing the composite material based on the surface treatment of the wheat straw fibers, the performance of the composite material prepared from the wheat straw fibers treated by one of xylanase, lipase and coupling agent A-172 is better than that of the composite material prepared from the wheat straw fibers not treated; the performance of the composite material prepared by treating the wheat straw fibers with two of xylanase, lipase and coupling agent A-172 is better than that of the composite material prepared by treating the wheat straw fibers with one of the xylanase, the lipase and the coupling agent A-172; the performance of the composite material prepared from the wheat straw fiber treated by xylanase, lipase and coupling agent A-172 is better than that of the composite material prepared from two kinds of treated wheat straw fibers; the composite material prepared from the three kinds of wheat straw fibers subjected to composite treatment has the tensile strength of 24.40MPa, the bending strength of 34.68MPa, the bending modulus of 1986.29MPa and the water absorption of 0.58%. The surface treatment method solves the problem of poor compatibility of the wheat straw fiber and the matrix high-density polyethylene, and improves the overall performance of the composite material.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Example 1
Weighing 10g of wheat straw fiber with the water content of 3% and 90g of high-density polyethylene; crushing the wheat straw fibers to 60 meshes, crushing the high-density polyethylene to 4 meshes, and mixing the wheat straw fibers and the high-density polyethylene in a mixing mill for 5min at the mixing temperature of 153 ℃ and the rotating speed of the mixing mill of 10rpm to obtain a blend; crushing the blend to 4 meshes, placing the blend in a vacuum drying oven to dry the blend until the water content is 3%, pouring the blend into a vertical injection molding machine for injection molding, wherein the injection molding temperature is 150 ℃, and the injection molding pressure is 100 bar; and taking out the standard sample A after cooling.
Example 2:
the same as example 1 except that 20g of wheat straw fiber having a water content of 2% and 80g of high density polyethylene were weighed; and taking out the standard sample B after cooling.
Example 3:
the same as example 1 except that 30g of wheat straw fiber having a water content of 1% and 70g of high density polyethylene were weighed; and taking out the standard sample C after cooling.
Example 4:
the same as example 1 except that 40g of wheat straw fiber having a water content of 1% and 60g of high density polyethylene were weighed; and taking out the standard sample D after cooling.
Example 5:
the same as example 1 except that 50g of wheat straw fiber having a water content of 0.5% and 50g of high density polyethylene were weighed; and taking out the standard sample E after cooling.
The standard A, B, C, D, E specimens obtained in examples 1 to 5 were subjected to mechanical property tests, specifically, tensile strength, flexural strength, and flexural modulus, and the measured data are shown in table 1:
TABLE 1
And (4) conclusion: the tensile strength of the composite material shows a decreasing trend along with the increase of the mass percentage of the wheat straw fibers, and the bending strength and the bending modulus always show an increasing trend. From the two aspects of economic benefit and mechanical property, 30% of wheat straw fiber and 70% of high-density polyethylene are determined to be selected.
Condition 1: preparing 1000ml of buffer solution with the pH value of 5 by using deionized water, citric acid and sodium citrate, putting the buffer solution into a digital display constant temperature water bath kettle, heating to 50 ℃, and keeping the constant temperature; weighing 0.3g of xylanase, pouring the xylanase into the buffer solution, and stirring for 10min to uniformly mix the xylanase and the buffer solution to obtain a treatment solution; adding 60g of wheat straw fiber with the water content of 3% into the treatment liquid, and treating for 5 hours; taking out the treated wheat straw fibers, placing the wheat straw fibers on a 200-mesh sieve, and repeatedly cleaning the wheat straw fibers with deionized water until the pH value of the supernatant of the obtained cleaning solution is close to 7; and (3) drying the cleaned wheat straw fibers in a vacuum drying oven until the water content is 3%.
Condition 1': the same as the condition 1, except that the buffer solution was prepared at 1500ml, the pH was 4.5, and the buffer solution was heated to 40 ℃ and kept at a constant temperature; 0.1g of xylanase is weighed; 80g of wheat straw fiber with the water content of 2 percent is added into the treatment liquid; drying the cleaned wheat straw fiber until the water content is 2 percent.
Condition 1 ": the same as the condition 1 except that the buffer solution was prepared in 2000ml, and the pH was 6.5, the buffer solution was heated to 45 ℃ and kept at a constant temperature; weighing 1g of xylanase; 100g of wheat straw fiber with the water content of 1 percent is added into the treatment liquid; drying the cleaned wheat straw fiber until the water content is 1 percent.
Condition 2: preparing 1000ml of buffer solution with the pH value of 6 by using deionized water, citric acid and sodium citrate, putting the buffer solution into a digital display constant-temperature water bath kettle, heating to 40 ℃, and keeping the constant temperature; weighing 0.6g of lipase, pouring the lipase into the buffer solution, and stirring for 10min to uniformly mix the lipase and the buffer solution to obtain a treatment solution; adding 60g of wheat straw fiber with the water content of 3% into the treatment liquid, and treating for 5 hours; taking out the treated wheat straw fibers, placing the wheat straw fibers on a 200-mesh sieve, and repeatedly cleaning the wheat straw fibers with deionized water until the pH value of supernatant liquor of the obtained cleaning solution is close to 7; and (3) drying the cleaned wheat straw fibers in a vacuum drying oven until the water content is 3%.
Condition 2': the same as the condition 2 except that the buffer solution was prepared at 1500ml, the pH was 5.5, and the buffer solution was heated to 40 ℃ and kept at a constant temperature; weighing 0.5g of lipase; 80g of wheat straw fiber with the water content of 2 percent is added into the treatment liquid; and (3) drying the cleaned wheat straw fibers in a vacuum drying oven until the water content is 2%.
Condition 2 ": the same as in condition 2 except that the buffer solution was prepared at 2000ml, and the pH was 6.5, the buffer solution was heated to 45 ℃ and kept at a constant temperature; weighing 1.5g of lipase; 100g of wheat straw fiber with the water content of 1 percent is added into the treatment liquid; and (3) drying the cleaned wheat straw fibers in a vacuum drying oven until the water content is 1%.
Condition 3: weighing 3g of coupling agent A-172, dissolving in 600g of absolute ethyl alcohol, stirring to uniformly mix the coupling agent A-172 to obtain a treatment solution, and uniformly spraying the treatment solution on the wheat straw fibers by using a spray can to ensure that the treatment solution is fully contacted with the wheat straw fibers; and (3) putting the treated wheat straw fiber into a drying oven to be dried until the water content is 3%.
Condition 3': the same as in condition 3 except that 2g of the coupling agent A-172 was weighed and dissolved in 800g of absolute ethanol; 100g of wheat straw fiber with the water content of 2 percent is added into the treatment liquid; and (3) drying the cleaned wheat straw fibers in a vacuum drying oven until the water content is 2%.
Condition 3 ″: the same as in condition 3 except that 4g of the coupling agent A-172 was weighed out and dissolved in 1000g of absolute ethanol; 100g of wheat straw fiber with the water content of 1 percent is added into the treatment liquid; and (3) drying the cleaned wheat straw fibers in a vacuum drying oven until the water content is 1%.
Condition 4: weighing 30g of wheat straw fiber and 70g of high-density polyethylene; crushing the wheat straw fibers to 60 meshes, crushing the high-density polyethylene to 4 meshes, and mixing the wheat straw fibers and the high-density polyethylene in a mixing mill for 5min at the mixing temperature of 153 ℃ and the rotating speed of the mixing mill of 10rpm to obtain a blend; crushing the blend to 4 meshes, placing the blend in a vacuum drying oven to dry the blend until the water content is 3%, pouring the blend into a vertical injection molding machine for injection molding, wherein the injection molding temperature is 150 ℃, and the injection molding pressure is 100 bar; and taking out the standard sample after cooling.
Condition 4': weighing 30g of wheat straw fiber and 70g of high-density polyethylene; crushing the wheat straw fibers to 50 meshes, crushing the high-density polyethylene to 2 meshes, and mixing the wheat straw fibers and the high-density polyethylene in a mixing mill for 5min at the mixing temperature of 150 ℃ and the rotating speed of the mixing mill of 10rpm to obtain a blend; crushing the blend to 2 meshes, placing the blend in a vacuum drying oven to dry the blend until the water content is 2%, pouring the blend into a vertical injection molding machine to be injection molded, wherein the injection molding temperature is 148 ℃, and the injection molding pressure is 100 bar; and taking out the standard sample after cooling.
Condition 4 ″: weighing 30g of wheat straw fiber and 70g of high-density polyethylene; crushing the wheat straw fibers to 55 meshes, crushing the high-density polyethylene to 6 meshes, and mixing the wheat straw fibers and the high-density polyethylene in a mixing mill for 5min at the mixing temperature of 155 ℃ and the rotation speed of the mixing mill of 10rpm to obtain a blend; crushing the blend to 6 meshes, placing the blend in a vacuum drying oven to dry the blend until the water content is 1 percent, pouring the blend into a vertical injection molding machine to be injection molded, wherein the injection molding temperature is 152 ℃, and the injection molding pressure is 100 bar; and taking out the standard sample after cooling.
Example 6:
condition 1+ condition 4; and taking out the standard sample F after cooling.
Example 7:
condition 1 '+ condition 4'; and taking out the standard sample G after cooling.
Example 8:
condition 1 "+ condition 4"; and taking out the standard sample H after cooling.
Example 9:
condition 2+ condition 4; and taking out the standard sample I after cooling.
Example 10:
condition 2 '+ condition 4'; and taking out the standard sample J after cooling.
Example 11:
condition 2 "+ condition 4"; and taking out the standard sample K after cooling.
Example 12:
condition 3+ condition 4; and taking out the standard sample L after cooling.
Example 13:
condition 3 '+ condition 4'; and taking out the standard sample M after cooling.
Example 14:
condition 3 "+ condition 4"; and taking out the standard sample N after cooling.
Example 15:
condition 1+ condition 2+ condition 4; and taking out the standard sample O after cooling.
Example 16:
condition 1 ' + condition 2 ' + condition 4 '; and taking out the standard sample P after cooling.
Example 17:
condition 1 "+ condition 2" + condition 4 "; and taking out the standard sample Q after cooling.
Example 18:
condition 1+ condition 3+ condition 4; and taking out the standard sample R after cooling.
Example 19:
condition 1 ' + condition 3 ' + condition 4 '; and taking out the standard sample S after cooling.
Example 20:
condition 1 "+ condition 3" + condition 4 "; and taking out the standard sample T after cooling.
Example 21:
condition 2+ condition 3+ condition 4; and taking out the standard sample U after cooling.
Example 22:
condition 2 ' + condition 3 ' + condition 4 '; and taking out the standard sample V after cooling.
Example 23:
condition 2 "+ condition 3" + condition 4 "; and taking out the standard sample W after cooling.
Example 24:
condition 1+ condition 2+ condition 3+ condition 4; and taking out the standard sample X after cooling.
Example 25:
condition 1 '+ condition 2' + condition 3 '+ condition 4'; and taking out the standard sample Y after cooling.
Example 26:
condition 1 "+ condition 2" + condition 3 "+ condition 4"; and taking out the standard sample Z after cooling.
The standard samples obtained in examples 6 to 14 were subjected to mechanical property tests, i.e., tensile strength, flexural modulus, and the measured data are shown in Table 2:
TABLE 2
And (4) conclusion: the performance of the composite material prepared from the wheat straw fiber treated by one of xylanase, lipase and coupling agent A-172 is better than that of the composite material prepared from the wheat straw fiber not treated; the performance of the composite material prepared by treating the wheat straw fibers with two of xylanase, lipase and coupling agent A-172 is better than that of the composite material prepared by treating the wheat straw fibers with one of the xylanase, the lipase and the coupling agent A-172; the performance of the composite material prepared from the wheat straw fiber treated by xylanase, lipase and coupling agent A-172 is better than that of the composite material prepared from two kinds of treated wheat straw fibers; the composite material prepared from the three kinds of wheat straw fibers subjected to composite treatment has the tensile strength of 24.40MPa, the bending strength of 34.68MPa, the bending modulus of 1986.29MPa and the water absorption of 0.58%. The surface treatment method solves the problem of poor compatibility of the wheat straw fiber and the matrix high-density polyethylene, and improves the overall performance of the composite material.
According to the method for preparing the composite material based on the wheat straw fiber surface treatment, the coupling agent is added at last during the composite treatment, because the biological enzyme treatment is carried out under an acid buffer solution, if the coupling agent is firstly used for treatment, the coupling agent is grafted on the fiber, and after the biological enzyme is soaked in an acid solution, the gel phenomenon can be generated, so that the modification effect is poor.
Claims (2)
1. The method for preparing the composite material based on the surface treatment of the wheat straw fiber is characterized in that the wheat straw fiber is subjected to the surface treatment, the treated wheat straw fiber and the high-density polyethylene are placed in a mixing roll to be mixed to obtain a blend, and the blend is placed in an injection molding machine to be injection molded to obtain the composite material; the method is implemented according to the following steps:
step 1, performing surface treatment on wheat straw fibers, preparing a treatment solution, treating the wheat straw fibers with the treatment solution, and cleaning and drying the treated wheat straw fibers;
step 2, mixing, namely crushing the wheat straw fibers obtained in the step 1 to 50-60 meshes, crushing the high-density polyethylene to 2-6 meshes, weighing the wheat straw fibers and the high-density polyethylene according to a proportion, and mixing in a mixer to obtain a blend;
step 3, injection molding, namely crushing the blend obtained in the step 2 to 2-6 meshes, drying the blend until the water content is below 3%, and placing the blend in an injection molding machine for injection molding to obtain a composite material;
the specific process of the step 1 is as follows:
1.1, treating wheat straw fibers with xylanase, preparing a buffer solution a with the pH value of 4.5-6.5 by using deionized water, citric acid and sodium citrate, putting the buffer solution a into a digital display constant-temperature water bath kettle, heating to 40-50 ℃, and keeping the constant temperature; weighing xylanase, adding the xylanase into the buffer solution a, and stirring to uniformly mix the xylanase and the buffer solution a to obtain a treatment solution a; weighing wheat straw fibers with the water content of less than 3%, adding the wheat straw fibers into the treatment liquid a, and treating for 4.5-5.5 hours; taking out the treated wheat straw fibers, placing the wheat straw fibers on a 200-mesh sieve, and repeatedly cleaning the wheat straw fibers with deionized water until the pH value of the supernatant of the cleaning solution is 6.5-7.5; drying the washed wheat straw fiber until the water content is below 3%; wherein the mass ratio of the buffer solution a to the xylanase to the wheat straw fiber is (1000-2000): (0.1-1.0): (60-100) in sequence;
Step 1.2, treating wheat straw fibers with lipase, preparing a buffer solution b with the pH value of 4.5-6.5 by using deionized water, citric acid and sodium citrate, putting the buffer solution b into a digital display constant temperature water bath, heating to 40-50 ℃, and keeping the constant temperature; weighing lipase, adding the lipase into the buffer solution b, and stirring to uniformly mix the lipase and the buffer solution b to obtain a treatment solution b; weighing the wheat straw fibers treated in the step 1.1, adding the wheat straw fibers into the treatment liquid b, and treating for 4.5-5.5 hours; taking out the treated wheat straw fibers, placing the wheat straw fibers on a 200-mesh sieve, and repeatedly cleaning the wheat straw fibers with deionized water until the pH value of the supernatant of the obtained cleaning solution is 6.5-7.5; drying the washed wheat straw fiber in a vacuum drying oven until the water content is below 3%; wherein the mass ratio of the buffer solution b, the lipase and the wheat straw fiber is (1000-2000): (0.5-1.5): (60-100) in sequence;
step 1.3, treating the wheat straw fibers by using a coupling agent A-172, weighing the coupling agent A-172, dissolving the coupling agent A-172 in absolute ethyl alcohol, and stirring to uniformly mix the coupling agent A-172 and the absolute ethyl alcohol to obtain a treatment solution c; uniformly spraying the treatment solution c on the surface of the wheat straw fiber treated in the step 1.2 to ensure that the treatment solution is fully contacted with the wheat straw fiber; drying the treated wheat straw fiber until the water content is below 3%; wherein the mass ratio of the absolute ethyl alcohol, the coupling agent A-172 and the wheat straw fiber is (600-1000): (2-4): 100;
In the step 3, the injection molding temperature is 150 +/-2 ℃, and the injection molding pressure is 100 bar.
2. The method for preparing a composite material based on the surface treatment of the wheat straw fiber as claimed in claim 1, wherein in the step 2, the mass ratio of the high-density polyethylene to the wheat straw fiber is 7:3, the mixing temperature is 150-155 ℃, and the rotation speed of the mixer is 10 rpm.
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