CN111440372A

CN111440372A - High-impact-toughness boiling-water-boiling-resistant frozen plastic-wood composite material and preparation method thereof

Info

Publication number: CN111440372A
Application number: CN202010297438.6A
Authority: CN
Inventors: 叶强; 姚俊; 黄永勇; 张菲菲; 阮敏婷
Original assignee: Huangshan Huasu New Material Science & Technology Co ltd
Current assignee: Huangshan Huasu New Material Science & Technology Co ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-07-24

Abstract

The invention belongs to the technical field of composite material preparation, and particularly relates to a boiling water boiling-resistant frozen plastic-wood composite material with high impact toughness and a preparation method of the composite material. The composite material provided by the invention is mainly prepared by taking wood powder, methyl vinyl silicone rubber, low-viscosity 107 silicone rubber, a vulcanizing agent A, a vulcanizing agent B, glass sand, low-density polyethylene, high-density polyethylene, a compatilizer, a coupling agent and a lubricant as raw materials and carrying out extrusion granulation and molding. The product of the invention adopts specific raw materials and preparation process, the obtained plastic-wood composite material has good impact toughness and outstanding water boiling-freezing resistance, and the impact toughness and static bending strength are hardly reduced obviously after water boiling-freezing-drying test, thus being especially suitable for outdoor environment in northern cold areas.

Description

High-impact-toughness boiling-water-boiling-resistant frozen plastic-wood composite material and preparation method thereof

Technical Field

The invention belongs to the technical field of composite material preparation, and particularly relates to a boiling water boiling-resistant frozen plastic-wood composite material with high impact toughness and a preparation method of the composite material.

Background

Along with the improvement of life quality, the plastic-wood material is widely applied by the advantages of good touch, easy cleaning, beautiful appearance and the like, and the plastic-wood material is paved on the road surfaces of various parks in a large area. In traditional plastic-wood materials, use ordinary wood flour, calcium carbonate filler and polyethylene or polypropylene basically, conventional calcium carbonate filler and wood flour are easy to absorb water, and there is the poor compatibility of filler and resin and easily leads to mixing and dissolving the inequality, and impact toughness is not enough, receive the collision easy cracking, when using in the outdoor long time in park, the water resistance is poor, especially uses because outdoor moisture and difference in temperature are great after snow in cold areas such as north, leads to performance not good, and the breakage rate is higher.

CN107236179A A biomass composite material with high hydrophobicity is characterized in that the biomass composite material is prepared by using raw materials containing modified wood flour, plastic particles, a toughening agent, a compatilizer, a coupling agent and hydrophobic filler nano calcium carbonate, wherein the modified wood flour is prepared by carrying out a dehydration etherification reaction on poly (dimethyl siloxane), trimethyl silanol and wood flour in a solvent and then carrying out an esterification modification reaction on hydroxyl on the surface of the wood flour.

The above-mentioned patent documents use modified wood flour and other raw materials so that the obtained composite material has excellent hydrophobicity and excellent boiling resistance. However, the above patent application documents have low impact toughness and cannot solve the problems of poor service performance and high breakage rate caused by large outdoor temperature difference (boiling-freezing resistance type) in northern cold regions.

Disclosure of Invention

In order to solve the technical problems, the invention provides a boiling water boiling-freezing resistant plastic-wood composite material with high impact toughness, and the impact toughness and the boiling water boiling-freezing resistance of the composite material are excellent.

In the invention, in the selection of raw materials, wood flour with smaller size and filler with excellent water resistance, such as glass sand, are selected firstly, and the wood flour and the glass sand are fully modified by a special silicon rubber vulcanization modification process, and simultaneously, low-density polyethylene is used for participating in modification, so that the interface effect is reduced, and the compatibility with high-density polyethylene is enhanced;

meanwhile, the grain size of the wood powder, the type and the grain size of the filler are limited, and only the glass sand filler with a certain grain size range has the most excellent effect after being used;

and the room-temperature vulcanized 107 silicon rubber with low viscosity and the high-temperature vulcanized methyl vinyl silicone rubber are used in combination, the sufficient effect of the silicon rubber on the surface modification of the wood powder and the glass sand filler is improved by virtue of banburying and vulcanization processes, the combination degree of the silicon rubber and the high-density polyethylene is improved by virtue of the participation of the low-density polyethylene, the toughness of the composite material after the silicon rubber is vulcanized and modified is greatly enhanced, the boiling resistance and the high-low temperature resistance are both remarkably improved, and finally the plastic-wood composite material product with excellent impact toughness and boiling water boiling-freezing resistance is obtained.

The high impact toughness boiling water boiling-resistant and freezing-resistant plastic-wood composite material provided by the invention is mainly obtained by extrusion granulation and molding of raw materials of wood powder, methyl vinyl silicone rubber, low-viscosity 107 silicone rubber, vulcanizing agent A, vulcanizing agent B, glass sand, low-density polyethylene, high-density polyethylene, compatilizer, coupling agent and lubricant.

The weight parts of the main raw materials are as follows: 20-35 parts of wood powder, 4-9 parts of methyl vinyl silicone rubber, 3-7 parts of low-viscosity 107 silicone rubber, 0.2-0.5 part of vulcanizing agent A, 0.3-0.8 part of vulcanizing agent B, 10-20 parts of glass sand, 15-25 parts of low-density polyethylene, 25-50 parts of high-density polyethylene, 2-5 parts of compatilizer, 1-3 parts of coupling agent, 0.5-3 parts of lubricating agent, 10100.5-2 parts of antioxidant and UV-11300.5-1.5 parts of ultraviolet absorbent.

The vulcanizing agent A is dibenzoyl peroxide;

preferably, the vulcanizing agent B is a mixture of ethyl orthosilicate and dibutyltin dilaurate; or a mixture of methyltrimethoxysilane and dibutyltin dilaurate;

preferably, the mass ratio of ethyl orthosilicate to dibutyltin dilaurate is 5-8: 1; or the mass ratio of methyltrimethoxysilane to dibutyltin dilaurate is 5-8: 1;

preferably, the wood powder is 300-350 meshes;

preferably, the coupling agent is titanate coupling agent ZJ-38S;

preferably, the lubricant is stearic acid or palmitic acid;

preferably, the antioxidant is antioxidant 1010.

Preferably, the methyl vinyl silicone rubber is vinyl-terminated raw rubber particles with the particle size of 5-20 meshes;

preferably, the low viscosity 107 silicone rubber has a viscosity of 2000-4000 mPa · s (25 ℃).

Preferably, the size of the glass sand is 280-300 meshes;

preferably, the compatibilizer is a maleic anhydride graft-modified high density polyethylene.

The preparation method of the boiling water boiling-resistant and freezing type plastic-wood composite material with high impact toughness comprises the following steps:

(1) dispersing a vulcanizing agent A in an ethanol solution, uniformly spraying the solution on the surfaces of methyl vinyl silicone rubber particles, fully stirring for 10-30 min, keeping the temperature at 20-35 ℃ for 1-3 h after uniformly stirring to naturally volatilize and dry an ethanol solvent;

(2) mixing a vulcanizing agent B and low-viscosity 107 silicone rubber, fully stirring for 5-10 min at 20-30 ℃, and uniformly mixing for later use;

(3) fully mixing wood powder, glass sand, low-density polyethylene, methyl vinyl silicone rubber particles containing a vulcanizing agent A obtained in step (1) and low-viscosity 107 silicone rubber containing a vulcanizing agent B obtained in step (2) to prepare a primary premix after uniform mixing;

(4) banburying and vulcanizing the primary premix; then cooling and crushing to obtain a silicon rubber modified material;

(5) uniformly mixing the silicon rubber modified material, the high-density polyethylene, the compatilizer, the coupling agent and other auxiliaries, discharging the mixture into cold mixing, and discharging the mixture after cooling to prepare a special premix;

preferably, the other auxiliary agents comprise at least a lubricant;

preferably, the other auxiliary agents are a lubricant, an antioxidant and an ultraviolet absorbent;

(6) adding the special premix in the step (5) into a parallel double-screw extruder for extrusion granulation;

(7) putting the granules prepared in the step (6) into a conical double-screw wood-plastic profile extruder for extrusion;

(8) and cooling, shaping and cutting the extruded and molded section into a finished product in a fixed length manner to obtain the plastic-wood composite material with high impact toughness and boiling water boiling resistance.

Preferably, in the (1), the mass ratio of the vulcanizing agent A to the ethanol solution is 1: 5.

(3) the mixing temperature is 20-40 ℃, and the mixing time is 10-20 min.

(4) Adding the primary premix into an internal mixer for internal mixing for 3-5 min at 120-130 ℃, discharging materials to a vulcanizing machine for high-temperature vulcanization after the internal mixing is uniform, wherein the vulcanization conditions are as follows: hot vulcanization is carried out for 10-20 min at 140-150 ℃ and 8 Mpa; and then cooling to room temperature, and crushing into particles of 10-30 meshes to obtain the silicon rubber modified material.

(5) Fully and uniformly mixing the raw materials at 130-150 ℃, cooling to 70-90 ℃, discharging, and preparing into a special premix;

preferably, (6) during granulation, the temperature of a machine barrel is 170-190 ℃, and the rotating speed of a screw is 250-350 rpm;

preferably, in the step (7), the temperature of the cylinder is 180 to 200 ℃ and the rotation speed of the screw is 10 to 30rpm during extrusion.

(1) dispersing the vulcanizing agent A in an ethanol solution, then uniformly spraying the solution on the surfaces of the methyl vinyl silicone rubber particles, fully stirring for 10-30 min, keeping the temperature at 20-35 ℃ for 1-3 h after uniformly stirring to naturally volatilize and dry an ethanol solvent; the mass ratio of the vulcanizing agent A to the ethanol solution is 1: 5;

(2) fully stirring vulcanizing agent B and low-viscosity 107 silicon rubber for 5-10 min at 20-30 ℃, and uniformly mixing for later use;

(3) fully mixing wood powder, glass sand, low-density polyethylene, methyl vinyl silicone rubber particles containing a vulcanizing agent A obtained in the step (1) and low-viscosity 107 silicone rubber containing a vulcanizing agent B obtained in the step (2) at the temperature of 20-40 ℃ for 10-20 min, and uniformly mixing to prepare a primary premix;

(4) adding the primary premix into an internal mixer for banburying for 3-5 min at the banburying temperature of 120-130 ℃, discharging the materials to a vulcanizing machine for high-temperature vulcanization after banburying is uniform, wherein the vulcanization conditions are as follows: hot vulcanization is carried out for 10-20 min at 140-150 ℃ and 8 Mpa; then cooling to room temperature, and crushing into particles of 10-30 meshes to obtain the silicon rubber modified material;

(5) fully and uniformly mixing the silicon rubber modified material, the high-density polyethylene, the compatilizer, the coupling agent and the lubricant at 130-150 ℃, discharging to cold mixing, cooling to 80 ℃, and discharging to prepare a special premix;

(6) adding the special premix into a parallel double-screw extruder for extrusion granulation; the process conditions are as follows: the temperature of a machine barrel is 170-190 ℃, and the rotating speed of a screw is 250-350 rpm;

(7) putting the granules prepared in the step (6) into a conical double-screw wood-plastic profile extruder, wherein the process conditions are as follows: the temperature of the machine barrel is 180-200 ℃, and the rotating speed of the screw is 10-30 rpm;

(8) the extruded section is cooled, shaped and cut to length to obtain the finished product, and the plastic-wood composite material with high impact toughness and boiling water boiling resistance and freezing resistance is obtained.

More preferably, the preparation method of the boiling water boiling-resistant and freezing-resistant plastic-wood composite material with high impact toughness comprises the following steps:

(3) fully mixing wood powder, glass sand, low-density polyethylene, methyl vinyl silicone rubber particles containing a vulcanizing agent A obtained in step (1) and low-viscosity 107 silicone rubber containing a vulcanizing agent B obtained in step (2) at 30 ℃ for 15min, and uniformly mixing to prepare a primary premix;

(4) adding the primary premix into an internal mixer for internal mixing for 4min at 120 ℃, discharging materials to a vulcanizing machine for high-temperature vulcanization after the internal mixing is uniform, wherein the vulcanization conditions are as follows: hot vulcanizing at 140 deg.C and 8Mpa for 15 min; then cooling to room temperature, and crushing into 20-mesh particles to obtain the silicon rubber modified material;

(5) fully and uniformly mixing the silicon rubber modified material, the high-density polyethylene, the compatilizer, the coupling agent and the lubricant according to the formula ratio at 140 ℃, discharging to cold mixing, cooling to 80 ℃, and discharging to prepare special premix;

(6) adding the special premix into a parallel double-screw extruder for extrusion granulation; the process conditions are as follows: the temperature of the machine barrel is 180 ℃, and the rotating speed of the screw is 300 rpm;

(7) putting the granules prepared in the step (6) into a conical double-screw wood-plastic profile extruder, wherein the process conditions are as follows: the temperature of a machine barrel is 190 ℃, and the rotating speed of a screw is 20 rpm;

The product of the invention adopts specific raw materials and preparation process, the obtained plastic-wood composite material has good impact toughness and outstanding water boiling-freezing resistance, and the impact toughness and static bending strength are hardly reduced obviously after water boiling-freezing-drying test, thus being especially suitable for outdoor environment in northern cold areas.

Detailed Description

In order that those skilled in the art will better understand the present invention, the inventors will further describe and illustrate the present invention by the following specific examples, but do not limit the present invention.

The raw materials of the invention, the specification or the manufacturer or the purchasing manufacturer are as follows:

the size of the wood powder is 300-350 meshes;

the methyl vinyl silicone rubber is vinyl-terminated raw rubber particles, the model number of the raw rubber particles can be 110-5S, 110-6S or 110-7S, and the raw rubber particles are purchased from Shenzhen Mu, science and technology Limited;

the viscosity of the low-viscosity 107 silicone rubber is 2000-4000 mPa & s (25 ℃), which is purchased from Jinan Yingyu chemical Limited company;

the vulcanizing agent A is dibenzoyl peroxide, contains 25 wt% of water and is purchased from Zhengzhou Runlai biological science and technology limited company;

the vulcanizing agent B is a mixture of ethyl orthosilicate and dibutyltin dilaurate; the mass ratio of ethyl orthosilicate to dibutyltin dilaurate is 5-8: 1;

or the vulcanizing agent B is a mixture of methyltrimethoxysilane and dibutyltin dilaurate, and the mass ratio of the methyltrimethoxysilane to the dibutyltin dilaurate is 5-8: 1;

low density polyethylene, model L D615, available from yanshan petrochemical company, ltd;

high density polyethylene, model 8008, available from striga petrochemical company;

the size of the glass sand is about 300 meshes and is purchased from a company Limited for smooth new materials in the firm market;

the compatilizer is maleic anhydride graft modified high-density polyethylene, the model is SZ11, and the compatilizer is purchased from Huangshan Bernoulli science and technology Co., Ltd;

the coupling agent is titanate coupling agent ZJ-38S which is purchased from Jie chemical technology Co., Ltd, Guangzhou city;

the lubricant is stearic acid or palmitic acid, and the antioxidant is antioxidant 1010;

example 1

The high-impact-toughness boiling-water-boiling-resistant frozen plastic-wood composite material comprises the following main raw materials in parts by weight:

30 parts of wood powder; methyl vinyl silicone rubber 7; low viscosity 107 silicone rubber 5; 0.5 of vulcanizing agent A; 0.5 of vulcanizing agent B; 15 parts of glass sand; low density polyethylene 20; high density polyethylene 40; a compatibilizer 3; a coupling agent 2; 2.5 parts of a lubricant; an antioxidant 10101.2; ultraviolet absorbers UV-11301.0;

the vulcanizing agent A is dibenzoyl peroxide;

the vulcanizing agent B is a mixture of ethyl orthosilicate and dibutyltin dilaurate; the mass ratio of ethyl orthosilicate to dibutyltin dilaurate is 6: 1;

the lubricant is stearic acid; the coupling agent is titanate coupling agent ZJ-38S; the wood powder is 300-350 meshes; the antioxidant is antioxidant 1010; the methyl vinyl silicone rubber is vinyl-terminated raw rubber particles with the granularity of 5-20 meshes; the viscosity of the low-viscosity 107 silicon rubber is 2000-4000 mPa & s (25 ℃);

the preparation process comprises the following steps:

the preparation method of the boiling water boiling-resistant frozen plastic-wood composite material with high impact toughness comprises the following steps:

Example 2

The difference from example 1 is that vulcanizing agent B is a mixture of methyltrimethoxysilane and dibutyltin dilaurate, and the mass ratio of methyltrimethoxysilane to dibutyltin dilaurate is 7: 1.

the lubricant is palmitic acid.

Example 3

The difference from example 1 is that the vulcanizing agent B is a mixture of ethyl orthosilicate and dibutyltin dilaurate; the mass ratio of ethyl orthosilicate to dibutyltin dilaurate is 6: 1;

the lubricant is palmitic acid.

Example 4

The difference from example 1 is that vulcanizing agent B is a mixture of methyltrimethoxysilane and dibutyltin dilaurate, and the mass ratio of methyltrimethoxysilane to dibutyltin dilaurate is 5: 1.

the raw material dosage in examples 2-4 is slightly different from that in example 1, and the method is the same as that in example 1, and specifically comprises the following steps:

TABLE 1 raw material ratio of each example

	Example 1	Example 2	Example 3	Example 4
					Wood flour	30	20	35	32
Methyl vinyl silicone rubber	7	4	9	8
					Low-viscosity 107 silicone rubber	5	3	7	6
Vulcanizing agent A	0.5	0.2	0.3	0.4
					Vulcanizing agent B	0.5	0.3	0.8	0.6
Glass sand	15	10	20	12
					Low density polyethylene	20	15	25	18
High density polyethylene	40	25	50	35
					Compatilizer	3	2	5	4
Coupling agent	2	1	3	2
					Lubricant agent	2.5	0.5	3	2
Antioxidant agent	1.2	0.5	2	1.5
					Ultraviolet absorber	1.0	0.5	1.5	1.2

Comparative example 1

The other conditions were the same as in example 1, and ordinary calcium carbonate was used instead of the glass sand;

comparative example 2

The other conditions were the same as in example 1 except that methyl vinyl silicone rubber and vulcanizing agent A were not used;

comparative example 3

The conditions were otherwise the same as in example 1 except that the low viscosity 107 silicone rubber and vulcanizing agent B were not used;

comparative example 4

The other conditions were the same as in example 1 except that no low density polyethylene was used;

comparative example 5

The other conditions were the same as in example 1 except that the addition of the low density polyethylene in step (3) was changed to the addition in step (5);

comparative example 6

The other conditions are the same as the example 1, except that the step (4) is not used, the primary premix obtained in the step (3) is directly subjected to the step (5), and is mixed with the high-density polyethylene and the auxiliary agent thereof for granulation;

comparative example 7

A commercially available ordinary plastic-wood composite board was used as comparative example 7, which was obtained from Anhui national wind technology Co., Ltd., model No. K23-140.

Comparative example 8

The product of example 1 of CN107236179A was used as comparative example 7.

Example 5

For the products in the examples and the comparative examples, the inventors performed performance tests, the specific method of which was as follows:

the static bending strength and the impact toughness of the invention are respectively detected according to methods of 4.7 parts and 4.22 parts in GB 17657-2013; the boiling water resistance is tested according to a method of 4.50 (boiling water resistance performance measurement) in the GB 17657-2013 standard, the percentage of mass increase after boiling water resistance is obtained, and the smaller the percentage is, the better the boiling water resistance is shown; the boiling water boiling-freezing resistance of the product is tested according to a method of a class I experiment (the plate thickness is more than or equal to 7mm) of a 4.10 (water boiling-freezing-drying treatment) part 4.10.4.4 thick plate in the GB 17657-2013 standard.

TABLE 2 table for examining the properties of products in examples and comparative examples

As can be seen from the data or description in the table, the product of the invention adopts specific raw materials and preparation process, the obtained plastic-wood composite material has good impact toughness, is not easy to damage, has outstanding boiling-freezing resistance, almost has no obvious reduction of impact toughness and static bending strength after being subjected to boiling-freezing-drying test, and is suitable for outdoor use in northern cold regions.

The use of the conventional calcium carbonate filler in comparative example 1 resulted in a slight decrease in the water resistance of the product; the adopted glass sand has excellent water resistance, and based on the characteristic, the glass sand and the wood powder are fully modified, and meanwhile, the low-density polyethylene is used for modification, so that the interface effect is reduced, and the compatibility with the high-density polyethylene is enhanced;

comparative example 2 because methyl vinyl silicone rubber with higher strength is not used, after wood flour and fillers are modified, the water resistance and strength of the product are obviously insufficient, so that the impact toughness and static bending strength of the plastic-wood composite material before and after the water boiling-freezing-drying test are obviously reduced;

comparative example 3 because the liquid low viscosity 107 silicone rubber with reinforcing effect and vulcanizing agent B are not used, the modification of wood powder and filler is not sufficient, and the water resistance and strength of the product are obviously reduced;

comparative example 4 does not use a low density polyethylene raw material with an interface modification effect, so that the compatibility and the bonding force of the wood powder and the filler after the silicon rubber vulcanization modification with the high density polyethylene are insufficient; similarly, in comparative example 5, the compatibility and the bonding force of plastic components such as low density polyethylene and high density polyethylene with the wood powder and the filler modified by the silicone rubber are insufficient because the low density polyethylene is not subjected to the vulcanization modification link and is only subjected to the mixing granulation action of a double-screw extruder;

in the comparative example 6, in order to simplify the preparation process, a vulcanization procedure is not used, so that the silicone rubber cannot be fully vulcanized and crosslinked, cannot play a role in reinforcing the wood powder and the filler, is only mixed and modified, and has poor mechanical property and water boiling-freezing resistance although the water resistance is slightly improved;

comparative example 7 a commercially available ordinary plastic-wood composite material was used, which had a general impact toughness, was easily broken and damaged, had insufficient boiling water resistance, and was remarkably reduced in impact toughness and static bending strength particularly after the water boiling-freeze-drying test, and was not suitable for outdoor long-term use in cold regions.

Comparative example 8 uses a special hydrophobic plastic-wood composite material, the boiling water resistance of the product is excellent, but the plastic-wood composite material is not suitable for outdoor long-term use in cold regions because the plastic-wood composite material has poor impact toughness, is easy to be damaged by external force collision, has surface cracks after being subjected to a boiling-freezing-drying test, and has obviously reduced impact toughness and static bending strength.

The comparison shows that the raw materials and the process adopted by the invention enable the finally obtained product to have excellent impact toughness, and the impact toughness and the static bending strength of the product are still basically unchanged after the product is boiled in water, frozen and dried, which shows that the product also has excellent boiling-freezing resistance and is suitable for outdoor long-term use in the north.

Claims

1. The plastic-wood composite material with high impact toughness and boiling water boiling resistance and freezing resistance is characterized by being prepared by mainly using wood powder, methyl vinyl silicone rubber, low-viscosity 107 silicone rubber, a vulcanizing agent A, a vulcanizing agent B, glass sand, low-density polyethylene, high-density polyethylene, a compatilizer, a coupling agent and a lubricant as raw materials and carrying out extrusion granulation and molding on the raw materials.

2. The high impact toughness, boiling water resistant and frozen plastic wood composite material according to claim 1, wherein the weight parts of the main raw materials are as follows: 20-35 parts of wood powder, 4-9 parts of methyl vinyl silicone rubber, 3-7 parts of low-viscosity 107 silicone rubber, 0.2-0.5 part of vulcanizing agent A, 0.3-0.8 part of vulcanizing agent B, 10-20 parts of glass sand, 15-25 parts of low-density polyethylene, 25-50 parts of high-density polyethylene, 2-5 parts of compatilizer, 1-3 parts of coupling agent, 0.5-3 parts of lubricating agent, 10100.5-2 parts of antioxidant and UV-11300.5-1.5 parts of ultraviolet absorbent.

3. The high impact toughness, boiling water retort-freezing resistant type plastic wood composite according to claim 1, wherein the vulcanizing agent A is dibenzoyl peroxide;

preferably, the wood powder is 300-350 meshes;

preferably, the coupling agent is titanate coupling agent ZJ-38S;

preferably, the lubricant is stearic acid or palmitic acid;

preferably, the antioxidant is antioxidant 1010;

preferably, the viscosity of the low-viscosity 107 silicone rubber at 25 ℃ is 2000-4000 mPa s;

preferably, the size of the glass sand is 280-300 meshes;

4. The method for preparing the high impact toughness boiling water retort-freezing resistant type plastic wood composite material according to claim 1, comprising the steps of:

preferably, the other auxiliary agents comprise at least a lubricant;

preferably, the other auxiliary agent is at least one of a lubricant, an antioxidant and an ultraviolet absorbent;

5. The method for preparing the high impact toughness boiling water resistant boiling-frozen type plastic wood composite material according to claim 1, wherein in the step (1), the mass ratio of the vulcanizing agent A to the ethanol solution is 1: 5.

6. the method for preparing the high impact toughness boiling water resistant boiling-frozen type plastic wood composite material according to claim 1, wherein in the step (3), the mixing temperature is 20-40 ℃ and the mixing time is 10-20 min.

7. The method for preparing the high impact toughness boiling water resistant boiling-frozen type plastic wood composite material according to claim 1, wherein in (4), the primary premix is added into an internal mixer for internal mixing for 3-5 min at 120-130 ℃, and after the internal mixing is uniform, the mixture is discharged into a vulcanizing machine for high temperature vulcanization, and the vulcanization conditions are as follows: hot vulcanization is carried out for 10-20 min at 140-150 ℃ and 8 Mpa; and then cooling to room temperature, and crushing into particles of 10-30 meshes to obtain the silicon rubber modified material.

8. The preparation method of the high impact toughness boiling water resistant boiling-freezing type plastic wood composite material according to claim 1, wherein in the step (5), the raw materials are fully and uniformly mixed at 130-150 ℃, cooled to 70-90 ℃ and discharged to prepare a special premix;

9. The method for preparing the high impact toughness boiling water retort-freezing resistant type plastic wood composite material according to claim 1, comprising the steps of:

10. The method for preparing the high impact toughness boiling water retort-freezing resistant type plastic wood composite material according to claim 1, comprising the steps of: