High-weather-resistance sound-insulation wood-plastic wallboard and preparation method thereof

Abstract

The invention discloses a high-weatherability sound insulation wood plastic wallboard and a preparation method thereof, the high-weatherability sound insulation wood plastic wallboard comprises the following raw materials by weight: 30-40 parts of wood flour or plant fiber, 25-35 parts of a sound insulation functional filler, 35-45 parts of high density polyethylene, 2-2.5 parts of maleic anhydride grafted high density polyethylene, 1-1.5 parts of stearic acid, 3-4.5 parts of a weatherability auxiliary agent, and 1-1.5 parts of azodicarbonamide. The problems of cracking, deformation and the like caused by moisture absorption expansion are relieved by optimizing the proportion and compatibility of the wood flour and the plastic, and then the problems of weather resistance and sound insulation of the wallboard outdoors are solved by filling the porous sound absorption material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wood-plastic composite materials, and particularly relates to a high-weather-resistance sound-insulation wood-plastic wallboard and a preparation method thereof. BACKGROUND

[0002] Wood-plastic composite (WPC) has been widely used in outdoor floor, railing and other fields due to its advantages of combining plant fibers and plastics, such as insect resistance, rot resistance, recyclability and the like. However, when the application field of wood-plastic composite is extended to building interior and exterior wallboards, the wood-plastic board of the prior art has obvious defects: for example, insufficient weather resistance, ordinary wood-plastic board is prone to color fading, surface powdering, cracking, warping and the like under the action of ultraviolet rays, heat and humidity, freeze-thaw cycle, resulting in a decrease in mechanical properties and a shortening of service life, in addition, the sound insulation performance of ordinary wood-plastic board is poor, and the wood-plastic board is mostly solid or has a simple single-cavity structure, and the sound insulation effect, especially the air sound insulation capacity, is limited, which is difficult to meet the requirements of modern buildings for privacy and quiet environment. SUMMARY

[0003] The main purpose of the present application is to provide a high-weather-resistance sound-insulation wood-plastic wallboard and a preparation method thereof, and at least one of the above technical problems is solved.

[0004] To achieve the above-mentioned purpose, the present application provides a high-weather-resistance sound-insulation wood-plastic wallboard, which comprises the following raw materials in parts by weight: wood powder or plant fiber 30-40 parts, sound insulation functional filler 25-35 parts, high-density polyethylene 35-45 parts, maleic anhydride grafted high-density polyethylene 2-2.5 parts, stearic acid 1-1.5 parts, weather resistance aid 3-4.5 parts, and azodicarbonamide 1-1.5 parts.

[0005] Further, the sound insulation functional filler comprises the following components in parts by weight: 12 parts of barium sulfate, 8-12 parts of mica powder and 5-10 parts of hollow glass microbeads.

[0006] Further, the hollow glass microbeads have a particle size of 30-100 microns and a true density of 0.20-0.60 g / cm 3 .

[0007] Further, the weather resistance aid comprises the following components in parts by weight: 0.7-0.8 parts of light stabilizer GW-944, 0.5-0.8 parts of antioxidant, 1-2 parts of calcium stearate and 0.8-1.0 parts of ultraviolet absorber UV-326, wherein the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1.

[0008] The present application also provides a preparation method of the above-mentioned high-weather-resistance sound-insulation wood-plastic wallboard, comprising the following steps: (1) Raw material pretreatment The wood powder or plant fiber and the sound insulation functional filler are respectively dried and treated; (2) High-speed mixing The dried wood powder or plant fiber, the dried sound insulation functional filler, high-density polyethylene, maleic anhydride grafted high-density polyethylene, stearic acid and weather-resistant additives are added into a high-speed mixer, and stirring treatment is performed to uniformly mix and preliminarily plasticize the raw materials, to obtain a premix; (3) Cooling and adding a foaming agent The premix is transferred into a cold mixer, and after cooling, azodicarbonamide is added and uniformly mixed to obtain a final mixture; (4) Extrusion molding The final mixture is sent into a double-screw extruder for extrusion molding treatment, to obtain the high-weather-resistant sound insulation wood-plastic wallboard.

[0009] Further, in step (1), the drying treatment of the wood powder or plant fiber is specifically operated at 100-110℃ until the water content is less than 2%.

[0010] Further, in step (1), the drying treatment of the sound insulation functional filler is specifically operated at 80-90℃ for 2-3 hours.

[0011] Further, in step (2), the stirring treatment is performed at a temperature of 90-110℃, a stirring speed of 400-600 rpm, and a time of 8-12 minutes.

[0012] Further, in step (3), the cooling degree is cooled to 40-50℃.

[0013] Further, in step (4), the extrusion molding treatment is performed at a pressure of-0.06 MPa or less, a barrel temperature of 130-170℃, a screw rotation speed of 55-135 rad / min, and a mold temperature of 130-160℃.

[0014] The beneficial effects of the present application are as follows: The present application optimizes the ratio and compatibility of wood powder and plastic to reduce cracking and deformation caused by moisture absorption and expansion, and fills porous sound-absorbing materials to solve the weather resistance and sound insulation problems of the wallboard outdoors. The main technical principles are as follows: (1) The ultraviolet absorber UV-326 preferentially absorbs high-energy ultraviolet light and converts it into harmless heat energy, which is dissipated. The light stabilizer GW-944 can efficiently capture destructive free radicals generated during the aging process of the material and neutralize these free radicals, terminating the chain degradation reaction. The antioxidant cooperates with the ultraviolet absorber and the light stabilizer to provide comprehensive protection. Calcium stearate can inhibit the growth of microorganisms in a humid environment and reduce water penetration due to its hydrophobic properties, thereby reducing deformation and hydrolytic aging caused by water absorption and evaporation.

[0015] (2) Micro-foaming structure: The final mixture containing a foaming agent is heated, melted, and plasticized in an extruder. When a certain temperature is reached, the foaming agent decomposes to produce nitrogen gas. However, these nitrogen gases do not immediately form bubbles but form a homogeneous, high-pressure polymer-gas saturated material with the polymer. After entering the normal pressure environment, the pressure drops sharply, and the solubility of the gas in the polymer decreases sharply with the decrease in pressure. The dissolved gas becomes supersaturated and precipitates from the melt, forming extremely small bubble nuclei. At this time, the shaping and cooling process of the die plays a role, and the high viscosity of the polymer melt and the cooling solidification limit the growth of the bubbles, allowing them to grow to micron-level or below. In addition, the base slab is subjected to negative pressure during the cooling process, which absorbs the gas that may have broken through the surface due to excessive growth, ensuring a smooth surface and allowing the polymer to fully solidify, permanently fixing the micro-foaming structure. The micro-foaming structure not only ensures sufficient strength but also reduces the weight of the wallboard, lowers the cost of raw materials, and improves the thermal insulation performance of the product.

[0016] (3) The sound insulation functional filler composed of barium sulfate, mica powder, and hollow glass microbeads, combined with the micro-foaming structure, can effectively dissipate sound waves and increase the resistance and mass of the sound wave propagation path, achieving efficient sound insulation.

[0017] (4) The use of maleic anhydride grafted high-density polyethylene enhances the interfacial bonding force between wood powder and resin and avoids the mechanical property degradation caused by the addition of fillers. DETAILED DESCRIPTION

[0018] To make the skilled in the art more clearly understand the technical solutions described in the present application, the following examples are provided for illustration. It should be noted that the following examples do not limit the scope of protection required by the present application.

[0019] The raw materials, reagents, or devices used in the following examples, unless otherwise specified, can be obtained from conventional commercial channels or can be obtained by existing known methods. Unless otherwise specified, the methods used in the examples of the present application are methods mastered by those skilled in the art. Among them: Double-screw extruder: purchased from Jinwei Machinery (Haining) Co., Ltd., model SIZ65 / 13; High-density polyethylene: purchased from PetroChina Kunlun Petrochemical, DMDA-8007; Maleic anhydride-grafted high-density polyethylene: purchased from Anhui Ruibins New Material Co., Ltd., RB-HDPE-MAH-0.8; Barium sulfate: purchased from Hebei Xinji Chemical Group, type XJ-98, 1250 mesh; Mica powder: purchased from Lingshou County Huajing Mica Co., Ltd., 800 mesh; Hollow glass microspheres: purchased from Shanghai Zhehua Chemical Materials Co., Ltd., 3M S35HS, particle size 30-100 micrometers, true density 0.20-0.60 g / cm³. 3 ; GW944: Purchased from Beijing Tiangang Additives Co., Ltd., GW-944; Calcium stearate: purchased from Wuhan Guangming Chemical Co., Ltd., GM-2; UV-326: Purchased from Beijing Tiangang Additives Co., Ltd.; Antioxidant 1010: Purchased from Linyi Sanfeng Chemical Co., Ltd., SF-1010; Antioxidant 168: Purchased from Linyi Sanfeng Chemical Co., Ltd., SF-168; Stearic acid: purchased from Hangzhou Oil & Fat Chemical Co., Ltd., H-185; Azodicarbonamide: purchased from Jiangxi Shixing Technology Co., Ltd., AC-1000; Example 1 Preparation of high weather-resistant sound-insulating wood-plastic wall panels The raw material formula for high weather-resistant sound-insulating wood-plastic wall panels by weight is shown in Table 1: Table 1

[0020] The antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1.

[0021] The preparation method of high weather-resistant sound-insulating wood-plastic wall panels includes the following steps: (1) Raw material pretreatment The wood flour was dried at 100℃ until the moisture content was less than 2%, and the sound insulation filler was dried at 90℃ for 2 hours. (2) High-speed mixing The dried wood powder or plant fiber, dried sound insulation filler, high-density polyethylene, maleic anhydride-grafted high-density polyethylene, stearic acid and weather-resistant additives are added to a high-speed mixer and stirred for 12 minutes at a temperature of 90℃ and a stirring speed of 400rpm to make the raw materials evenly mixed and initially plasticized, thus obtaining a premix. (3) Cooling and adding foaming agent The premix is transferred into a cold mixer, and after cooling to 40°C, azodicarbonamide is added, and mixed at 50 rpm for 3 minutes to uniformly disperse the foaming agent, to obtain a final mixture; (4) Extrusion molding The final mixture is fed into the feeding bin of a double-screw extruder, the barrel temperature is set to 170°C, the mold temperature is 160°C, and the screw rotation speed is 135 rad / min, and extrusion molding is performed. After the mold is kept warm for 3 min, circulating water at a temperature of 15°C is introduced to cool and shape, to obtain the high-weatherability soundproof wood-plastic wallboard.

[0022] Example 2 Preparation of high-weatherability soundproof wood-plastic wallboard The raw material formula of the high-weatherability soundproof wood-plastic wallboard is shown in Table 2 by weight: Table 2

[0023] The antioxidant is composed of antioxidant 1010 and antioxidant 168 at a weight ratio of 1:1.

[0024] The preparation method of the high-weatherability soundproof wood-plastic wallboard comprises the following steps: (1) Raw material pretreatment The wood powder is dried at 105°C to a moisture content of less than 2%, and the soundproof functional filler is dried at 85°C for 2.5 hours; (2) High-speed mixing The dried wood powder or plant fiber, the dried soundproof functional filler, high-density polyethylene, maleic anhydride grafted high-density polyethylene, stearic acid, and weather-resistant additives are added to a high-speed mixer, and stirred at a temperature of 100°C and a stirring speed of 500 rpm for 10 minutes, to uniformly mix and preliminarily plasticize the raw materials, to obtain a premix; (3) Cooling and adding foaming agent The premix is transferred into a cold mixer, and after cooling to 45°C, azodicarbonamide is added, and mixed at 50 rpm for 4 minutes to uniformly disperse the foaming agent, to obtain a final mixture; (4) Extrusion molding The final mixture is fed into the feeding bin of a double-screw extruder, the barrel temperature is set to 150°C, the mold temperature is 145°C, and the screw rotation speed is 95 rad / min, and extrusion molding is performed. After the mold is kept warm for 3 min, circulating water at a temperature of 20°C is introduced to cool and shape, to obtain the high-weatherability soundproof wood-plastic wallboard.

[0025] Example 3 Preparation of high-weatherability soundproof wood-plastic wallboard The raw material formula of the high-weather-resistance sound insulation wood-plastic wallboard is shown in Table 3 in parts by weight: Table 3

[0026] The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1.

[0027] The preparation method of the high-weather-resistance sound insulation wood-plastic wallboard comprises the following steps: (1) Raw material pretreatment The wood powder is dried at 110°C to a moisture content of less than 2%, and the sound insulation functional filler is dried at 90°C for 3 hours; (2) High-speed mixing The dried wood powder or plant fiber, the dried sound insulation functional filler, high-density polyethylene, maleic anhydride grafted high-density polyethylene, stearic acid, and weather-resistant additives are added to a high-speed mixer and stirred at a temperature of 110°C and a stirring speed of 600 rpm for 8 minutes to uniformly mix and preliminarily plasticize the raw materials, thereby obtaining a premix; (3) Cooling and adding a foaming agent The premix is transferred to a cold mixer, cooled to 50°C, and then azodicarbonamide is added and mixed at 50 rpm for 5 minutes to uniformly disperse the foaming agent, thereby obtaining a final mixture; (4) Extrusion molding The final mixture is fed into the feeding bin of a double-screw extruder, the barrel temperature is set to 130°C, the mold temperature is set to 130°C, and the screw rotation speed is set to 55 rad / min, and then extrusion molding is performed, the mold is kept warm for 3 minutes, and then circulating water at a temperature of 25°C is introduced for cooling and shaping, thereby obtaining the high-weather-resistance sound insulation wood-plastic wallboard.

[0028] Comparative Example 1 Preparation of a comparative wood-plastic wallboard This comparative example is prepared according to the method of Example 2, except that the hollow glass microbeads are not added.

[0029] Comparative Example 2 Preparation of a comparative wood-plastic wallboard This comparative example is prepared according to the method of Example 2, except that the antioxidant is not added.

[0030] Performance testing of wood-plastic wallboard The high-weatherability soundproof wood-plastic wallboard prepared in each of the above embodiments and the comparative wood-plastic wallboard prepared in each of the comparative examples were subjected to performance testing, and the results are shown in Table 4 below. The soundproof performance was tested according to GB / T 19889.3; the weatherability was tested according to GB / T 16422.2; the falling ball impact strength was tested according to GB / T 14153; the density was tested according to GB / T 1033.1; and the 24h water absorption rate was tested according to GB / T 17657.

[0031] Table 4 Performance test results

[0032] It can be seen from the above data that omitting hollow glass beads during the preparation of the wallboard can result in a decrease in soundproof performance; and omitting the antioxidants (1010 / 168) can result in a decrease in weatherability. The present application can develop outdoor wood-plastic house projects, expand the application scenarios of wood-plastic composite materials, and reduce forest felling.

[0033] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-weather-resistant soundproof wood-plastic wallboard, characterized in that, The raw materials include, by weight parts, wood powder or plant fiber 30-40 parts, sound insulation functional filler 25-35 parts, high-density polyethylene 35-45 parts, maleic anhydride grafted high-density polyethylene 2-2.5 parts, stearic acid 1-1.5 parts, weather-resistant additive 3-4.5 parts, and azodicarbonamide 1-1.5 parts.

2. The high-weather-resistant soundproof wood-plastic wallboard according to claim 1, wherein, The sound insulation functional filler includes, by weight parts, 12 parts of barium sulfate, 8-12 parts of mica powder, and 5-10 parts of hollow glass microbeads. 3.The high-weather-resistance soundproof wood-plastic wallboard of claim 2, wherein, The hollow glass microsphere has a particle size of 30-100 microns and a true density of 0.20-0.60 g / cm 3 . 4.The high-weather-resistance soundproof wood-plastic wallboard of claim 1 or 2 or 3, characterized in that, The weather-resistant additive includes, by weight parts, 0.7-0.8 parts of light stabilizer GW-944, 0.5-0.8 parts of antioxidant, 1-2 parts of calcium stearate, and 0.8-1.0 parts of ultraviolet absorber UV-326, wherein the antioxidant is composed of antioxidant 1010 and antioxidant 168 at a weight ratio of 1:

1.

5. The method for preparing high weather-resistant sound-insulating wood-plastic wall panels as described in any one of claims 1 to 4, characterized in that, The method includes the following steps: (1) raw material pretreatment The wood powder or plant fiber and the sound insulation functional filler are dried respectively; (2) high-speed mixing The dried wood powder or plant fiber, the dried sound insulation functional filler, high-density polyethylene, maleic anhydride grafted high-density polyethylene, stearic acid, and weather-resistant additive are added into a high-speed mixer, stirred to mix and preliminarily plasticize the raw materials, and a premix is obtained; (3) cooling and adding foaming agent The premix is transferred into a cold mixer, cooled, and then azodicarbonamide is added and mixed uniformly to obtain a final mixture; (4) extrusion molding The final mixture is sent into a double-screw extruder for extrusion molding to obtain the high-weather-resistant sound insulation wood-plastic wallboard.

6. The method for preparing high weather-resistant sound-insulating wood-plastic wall panels as described in claim 5, characterized in that, In step (1), the wood powder or plant fiber is dried at 100-110°C until the moisture content is less than 2%.

7. The method for preparing high weather-resistant sound-insulating wood-plastic wall panels as described in claim 5, characterized in that, In step (1), the sound insulation functional filler is dried at 80-90°C for 2-3 hours.

8. The method for preparing high weather-resistant sound-insulating wood-plastic wall panels as described in claim 5, characterized in that, In step (2), the stirring temperature is 90-110°C, the stirring speed is 400-600 rpm, and the stirring time is 8-12 minutes. 9.The method for preparing the high-weather-resistance soundproof wood-plastic wallboard according to claim 5, characterized in that, In step (3), the cooling degree is cooling to 40-50°C.

10. The method for preparing the high weather-resistant sound-insulating wood-plastic wall panel as described in claim 5, characterized in that, In step (4), the extrusion molding pressure is below -0.06 MPa, the barrel temperature is 130-170°C, the screw rotation speed is 55-135 rad / min, and the mold temperature is 130-160°C.

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