Environment-friendly anti-aging extruded sheet and preparation method thereof

Abstract

The invention relates to the technical field of extruded sheet preparation, and discloses an environment-friendly anti-aging extruded sheet which comprises general-purpose polystyrene, a cross-linking agent, a carbon dioxide foaming agent, an antioxidant, an ultraviolet light absorber, a light stabilizer, a flame retardant and a coloring agent. The usage amount of the polystyrene accounts for 90%-98% of the total amount of the environment-friendly anti-aging extruded sheet, and the usage amount of the cross-linking agent accounts for 0.1%-1% of the total amount of the environment-friendly anti-aging extruded sheet. According to the environment-friendly anti-aging extruded sheet and the preparation method thereof, dibenzylidene sorbitol is added as a nucleating agent in the preparation process of the extruded sheet; the carbon dioxide foaming agent is added into the mixed material, so that more and uniform nuclear sites of the nucleating agent are increased in the mixed material, when the carbon dioxide foaming agent is added into the mixed material of the extruded sheet, the nuclear sites formed by the dibenzylidene sorbitol are found, and rapid nucleation and foaming are carried out, so that foam pores formed by the carbon dioxide foaming agent are finer and more uniform, and the foaming effect is better. And the compressive strength of the product is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of extruded board preparation, in particular to an environmentally friendly anti-aging extruded board and a preparation method thereof. Background Art

[0002] Extruded board, whose full name is extruded polystyrene foam board, also known as XPS board, is a board with a continuous and uniform surface and a closed-cell honeycomb structure made of polystyrene resin and other additives through an extrusion process. This material has the characteristics of high compression resistance, light weight, non-absorbent, airtight but wear-resistant and degradation-resistant. It is also light in texture, easy to use, will not mold, and has good corrosion resistance. It can not only be used as a thermal insulation material, but also can effectively prevent water and moisture, providing protection against leakage, condensation and freezing.

[0003] The extruded board in the prior art usually uses polystyrene resin as raw material and is a plastic product. It will have a certain impact on the environment during the production process, use process and disposal process after disposal. In the actual preparation process of the extruded board in the prior art, it is necessary to determine the specific preparation thickness according to production needs. The compressive strength and tensile strength of extruded boards of different thicknesses will change. The thinner the extruded board, the lower the compressive strength, and the easier it is to be damaged and discarded. The discarded extruded board will cause harm to the environment. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an environmentally friendly anti-aging extruded board and a preparation method thereof, which solves the problems raised in the above-mentioned background technology.

[0005] The present invention provides the following technical solution: an environmentally friendly anti-aging extruded board, the composition of the environmentally friendly anti-aging extruded board includes general-grade polystyrene, a cross-linking agent, a carbon dioxide foaming agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a flame retardant and a colorant;

[0006] The amount of polystyrene used accounts for 90%-98% of the total amount of the environmentally friendly anti-aging extruded board;

[0007] The amount of the cross-linking agent used accounts for 0.1%-1% of the total amount of the environmentally friendly anti-aging extruded board;

[0008] The amount of the foaming agent used accounts for 3%-8% of the total amount of the environmentally friendly anti-aging extruded board;

[0009] The amount of the antioxidant is 0.1%-0.3% of the total amount of the environmentally friendly anti-aging extruded board;

[0010] The amount of the ultraviolet absorber is 0.1%-0.3% of the total amount of the environmentally friendly anti-aging extruded board;

[0011] The amount of the light stabilizer used accounts for 0.1%-0.5% of the total amount of the environmentally friendly anti-aging extruded board;

[0012] The amount of the flame retardant is 3% to 8% of the total amount of the environmentally friendly anti-aging extruded board;

[0013] The amount of the colorant used accounts for 0.05%-0.3% of the total amount of the environmentally friendly anti-aging extruded board.

[0014] An environmentally friendly anti-aging extruded board, wherein the cross-linking agent is gamma-aminopropyltriethoxysilane.

[0015] An environmentally friendly anti-aging extruded board, wherein the antioxidant comprises a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a 1010 antioxidant and the auxiliary antioxidant is a 168 antioxidant.

[0016] The invention discloses an environmentally friendly anti-aging extruded board, wherein the ultraviolet absorber is UV-531 ultraviolet absorber.

[0017] An environmentally friendly anti-aging extruded board, wherein the light stabilizer is hindered amine light stabilizer 770.

[0018] An environmentally friendly anti-aging extruded board, wherein the flame retardant is melamine cyanurate.

[0019] An environmentally friendly anti-aging extruded board, wherein the colorant is a polystyrene masterbatch.

[0020] The invention discloses an environment-friendly anti-aging extruded board, which further comprises a nucleating agent and a lubricant, wherein the nucleating agent is dibenzylidene sorbitol, and the amount of dibenzylidene sorbitol accounts for 0.2%-0.5% of the total amount of the environment-friendly anti-aging extruded board; the lubricant is calcium stearate, and the amount of calcium stearate accounts for 0.1%-0.3% of the total amount of the environment-friendly anti-aging extruded board.

[0021] A method for preparing an environmentally friendly anti-aging extruded board is applicable to the preparation of any of the above environmentally friendly anti-aging extruded boards, and the method comprises the following steps:

[0022] S1: Putting general-purpose polystyrene, antioxidant, colorant and lubricant into a mixing bin for mixing, and conveying the mixture into an extruder through a hopper, so that the mixture gradually melts under the action of heating and shearing force of the extruder;

[0023] S2: In the initial stage of melting the mixed material, the ultraviolet absorber, the light stabilizer and the flame retardant are sequentially added to the mixed material through the hopper, and after further mixing with the mixed material, the crosslinking agent and the nucleating agent are added to the mixed material through the hopper, so that the mixed material can be fully mixed with the crosslinking agent and the nucleating agent in a molten state;

[0024] S3: Then, the foaming agent is pressurized and added into the mixed material through the high-pressure injection system, so that the mixed material is fully melted and mixed, and bubbles are generated. The mixed material is extruded through the die of the extruder to form a predetermined shape of the extruded board, and the extruded board is quickly cooled by the spray cooling method. At this point, the environmentally friendly anti-aging extruded board is prepared.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The environmentally friendly anti-aging extruded board and its preparation method add dibenzylidene sorbitol as a nucleating agent during the preparation of the extruded board, so that the nucleating agent increases the number of more and more uniform nucleation sites in the mixed material of the extruded board. When the carbon dioxide foaming agent is added into the mixed material of the extruded board under a certain pressure range and strict temperature control, the nucleation sites formed by dibenzylidene sorbitol can be quickly found in the mixed material, and nucleation and foaming can be quickly carried out, thereby making the bubbles formed by the carbon dioxide foaming agent more delicate and uniform, thereby improving the compressive strength of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a step diagram of the preparation method of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] See also Figure 1 , an environmentally friendly anti-aging extruded board, the composition of the environmentally friendly anti-aging extruded board includes general-purpose polystyrene, a cross-linking agent, a carbon dioxide foaming agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a flame retardant and a colorant, wherein the amount of polystyrene accounts for 90%-98% of the total amount of the environmentally friendly anti-aging extruded board, wherein the amount of the cross-linking agent accounts for 0.1%-1% of the total amount of the environmentally friendly anti-aging extruded board, wherein the amount of the foaming agent accounts for 3%-8% of the total amount of the environmentally friendly anti-aging extruded board, wherein the amount of the antioxidant accounts for 0.1%-0.3% of the total amount of the environmentally friendly anti-aging extruded board, wherein the amount of the ultraviolet absorber accounts for 0.1%-0.3% of the total amount of the environmentally friendly anti-aging extruded board;

[0031] The amount of light stabilizer accounts for 0.1%-0.5% of the total amount of environmentally friendly anti-aging extruded board, the amount of flame retardant accounts for 3%-8% of the total amount of environmentally friendly anti-aging extruded board, and the amount of colorant accounts for 0.05%-0.3% of the total amount of environmentally friendly anti-aging extruded board;

[0032] The crosslinking agent is γ-aminopropyltriethoxysilane, the antioxidant includes a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is 1010 antioxidant, the auxiliary antioxidant is 168 antioxidant, the ultraviolet absorber is UV-531 ultraviolet absorber, the light stabilizer is hindered amine light stabilizer 770, the flame retardant is melamine cyanurate, the colorant is polystyrene masterbatch, the environment-friendly anti-aging extruded board also includes a nucleating agent and a lubricant, wherein the nucleating agent is dibenzylidene sorbitol, and the amount of dibenzylidene sorbitol accounts for 0.2%-0.5% of the total amount of the environment-friendly anti-aging extruded board, and the lubricant is calcium stearate, and the amount of calcium stearate accounts for 0.1%-0.3% of the total amount of the environment-friendly anti-aging extruded board;

[0033] Specifically, the amount of general-purpose polystyrene accounts for 90% of the total amount of environmentally friendly anti-aging extruded board, the amount of antioxidants accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board (of which 1010 antioxidants account for 0.2% and 168 antioxidants account for 0.1%), the amount of polystyrene masterbatch accounts for 0.2% of the total amount of environmentally friendly anti-aging extruded board, the amount of calcium stearate accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board, and the amount of UV-531 ultraviolet absorber accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board;

[0034] The amount of hindered amine light stabilizer 770 accounts for 0.2% of the total amount of environmentally friendly anti-aging extruded board, the amount of melamine cyanurate accounts for 4% of the total amount of environmentally friendly anti-aging extruded board, the amount of γ-aminopropyl triethoxysilane accounts for 0.4% of the total amount of environmentally friendly anti-aging extruded board, the amount of dibenzylidene sorbitol accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board, and the carbon dioxide foaming agent accounts for 4% of the total amount of environmentally friendly anti-aging extruded board;

[0035] Then, the above raw materials were used to prepare Example 1 of the environmentally friendly anti-aging extruded board according to the following method:

[0036] S1: general-purpose polystyrene, 1010 antioxidant, 168 antioxidant, polystyrene masterbatch and calcium stearate are put into a mixing bin in proportion for mixing, and then the mixture is transported into an extruder through a hopper for heating and mixing, so that the mixture gradually melts under the action of heating and shearing force of the extruder, and as the mixture begins to melt, the polystyrene masterbatch can be more evenly dispersed in the polystyrene, and the addition and combined use of 1010 antioxidant and 168 antioxidant can prevent the general-purpose polystyrene from oxidizing during the processing process, and when the product is used outdoors, the oxidation of the product caused by the influence of light, oxygen and pollutants in the air can be suppressed, thereby extending the service life of the product, and the addition of calcium stearate can effectively reduce the friction of the general-purpose polystyrene during the extrusion process, improve the fluidity of the mixture, avoid the problem of overheating of the mixture due to excessive friction in the screw and barrel of the extruder, and then improve the quality and efficiency of the product;

[0037] S2: In the initial stage of melting the mixed material, UV-531 ultraviolet absorber, hindered amine light stabilizer 770 and melamine cyanurate are sequentially added to the mixed material through a hopper, and further mixed with the mixed material. Through the coordinated effect of UV-531 ultraviolet absorber and hindered amine light stabilizer 770, the aging speed of the product can be reduced when exposed to ultraviolet radiation outdoors, and the purpose of anti-aging is further achieved on the basis of anti-oxidation and environmental protection, and the strength and toughness of the product are continuously maintained;

[0038] Melamine cyanurate, as a flame retardant, reduces the toxic and harmful gases produced by the product during combustion on the basis of traditional flame retardancy, thereby reducing the harm to the air during the combustion of the product in the event of a fire, further improving the environmental protection effect;

[0039] Then, γ-aminopropyltriethoxysilane and dibenzylidene sorbitol are added to the mixed material through a hopper. By adding γ-aminopropyltriethoxysilane, the interfacial bonding force of the components of the product can be enhanced, the cohesive strength of the material is improved, and the compressive and flexural strengths of the product are further improved. Dibenzylidene sorbitol, as a nucleating agent, can not only regularly increase the number of nucleation sites, but also improve the dimensional stability of the product, reduce the probability of deformation of the product during use, thereby reducing the probability of bending and rupture, and further improve the impact strength of the product.

[0040] S3: Then, the foaming agent is pressurized and added into the mixed material through the high-pressure injection system. At this time, the temperature in the extruder is controlled at 180 degrees Celsius, and the pressure of the carbon dioxide foaming agent injection is controlled at 15Mpa-25Mpa, so that the carbon dioxide foaming agent can quickly nucleate at the nucleus site formed by dibenzylidene sorbitol in the mixed material during foaming, thereby increasing the number of bubbles, which are smaller and more uniform, thereby improving the compression resistance of the product. When the mixed material is fully melted and mixed, after bubbles are generated, the mixed material is extruded through the die of the extruder to form a predetermined shape of the extruded board, and the extruded board is quickly cooled by the spray cooling method. At this point, the preparation of the environmentally friendly anti-aging extruded board is completed.

[0041] Embodiment 2:

[0042] An environment-friendly anti-aging extruded board, the environment-friendly anti-aging extruded board comprises general-grade polystyrene, a cross-linking agent, a carbon dioxide foaming agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a flame retardant and a colorant, wherein the amount of polystyrene accounts for 90%-98% of the total amount of the environment-friendly anti-aging extruded board, wherein the amount of the cross-linking agent accounts for 0.1%-1% of the total amount of the environment-friendly anti-aging extruded board, wherein the amount of the foaming agent accounts for 3%-8% of the total amount of the environment-friendly anti-aging extruded board, wherein the amount of the antioxidant accounts for 0.1%-0.3% of the total amount of the environment-friendly anti-aging extruded board, wherein the amount of the ultraviolet absorber accounts for 0.1%-0.3% of the total amount of the environment-friendly anti-aging extruded board;

[0043] The amount of light stabilizer accounts for 0.1%-0.5% of the total amount of environmentally friendly anti-aging extruded board, the amount of flame retardant accounts for 3%-8% of the total amount of environmentally friendly anti-aging extruded board, and the amount of colorant accounts for 0.05%-0.3% of the total amount of environmentally friendly anti-aging extruded board;

[0044] The crosslinking agent is γ-aminopropyltriethoxysilane, the antioxidant includes a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is 1010 antioxidant, the auxiliary antioxidant is 168 antioxidant, the ultraviolet absorber is UV-531 ultraviolet absorber, the light stabilizer is hindered amine light stabilizer 770, the flame retardant is melamine cyanurate, the colorant is polystyrene masterbatch, the environment-friendly anti-aging extruded board also includes a nucleating agent and a lubricant, wherein the nucleating agent is dibenzylidene sorbitol, and the amount of dibenzylidene sorbitol accounts for 0.2%-0.5% of the total amount of the environment-friendly anti-aging extruded board, and the lubricant is calcium stearate, and the amount of calcium stearate accounts for 0.1%-0.3% of the total amount of the environment-friendly anti-aging extruded board;

[0045] Specifically, the amount of general-purpose polystyrene accounts for 90% of the total amount of environmentally friendly anti-aging extruded board, the amount of antioxidants accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board (of which 1010 antioxidants account for 0.2% and 168 antioxidants account for 0.1%), the amount of polystyrene masterbatch accounts for 0.2% of the total amount of environmentally friendly anti-aging extruded board, the amount of calcium stearate accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board, and the amount of UV-531 ultraviolet absorber accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board;

[0046] The amount of hindered amine light stabilizer 770 accounts for 0.2% of the total amount of environmentally friendly anti-aging extruded board, the amount of melamine cyanurate accounts for 4% of the total amount of environmentally friendly anti-aging extruded board, the amount of γ-aminopropyl triethoxysilane accounts for 0.45% of the total amount of environmentally friendly anti-aging extruded board, the amount of dibenzylidene sorbitol accounts for 0.25% of the total amount of environmentally friendly anti-aging extruded board, and the carbon dioxide foaming agent accounts for 4% of the total amount of environmentally friendly anti-aging extruded board;

[0047] Then, the above raw materials were used to prepare Example 2 of the environmentally friendly anti-aging extruded board according to the following method:

[0048] S1: general-purpose polystyrene, 1010 antioxidant, 168 antioxidant, polystyrene masterbatch and calcium stearate are put into a mixing bin in proportion for mixing, and then the mixture is transported into an extruder through a hopper for heating and mixing, so that the mixture gradually melts under the action of heating and shearing force of the extruder, and as the mixture begins to melt, the polystyrene masterbatch can be more evenly dispersed in the polystyrene, and the addition and combined use of 1010 antioxidant and 168 antioxidant can prevent the general-purpose polystyrene from oxidizing during the processing process, and when the product is used outdoors, the oxidation of the product caused by the influence of light, oxygen and pollutants in the air can be suppressed, thereby extending the service life of the product, and the addition of calcium stearate can effectively reduce the friction of the general-purpose polystyrene during the extrusion process, improve the fluidity of the mixture, avoid the problem of overheating of the mixture due to excessive friction in the screw and barrel of the extruder, and then improve the quality and efficiency of the product;

[0049] S2: In the initial stage of melting the mixed material, UV-531 ultraviolet absorber, hindered amine light stabilizer 770 and melamine cyanurate are sequentially added to the mixed material through a hopper, and further mixed with the mixed material. Through the coordinated effect of UV-531 ultraviolet absorber and hindered amine light stabilizer 770, the aging speed of the product can be reduced when exposed to ultraviolet radiation outdoors, and the purpose of anti-aging is further achieved on the basis of anti-oxidation and environmental protection, and the strength and toughness of the product are continuously maintained;

[0050] Melamine cyanurate, as a flame retardant, reduces the toxic and harmful gases produced by the product during combustion on the basis of traditional flame retardancy, thereby reducing the harm to the air during the combustion of the product in the event of a fire, further improving the environmental protection effect;

[0051] Then, γ-aminopropyltriethoxysilane and dibenzylidene sorbitol are added to the mixed material through a hopper. By adding γ-aminopropyltriethoxysilane, the interfacial bonding force of the components of the product can be enhanced, the cohesive strength of the material is improved, and the compressive and flexural strengths of the product are further improved. Dibenzylidene sorbitol, as a nucleating agent, can not only regularly increase the number of nucleation sites, but also improve the dimensional stability of the product, reduce the probability of deformation of the product during use, thereby reducing the probability of bending and rupture, and further improve the impact strength of the product.

[0052] S3: Then, the foaming agent is pressurized and added into the mixed material through the high-pressure injection system. At this time, the temperature in the extruder is controlled at 180 degrees Celsius, and the pressure of the carbon dioxide foaming agent injection is controlled at 15Mpa-25Mpa, so that the carbon dioxide foaming agent can quickly nucleate at the nucleus site formed by dibenzylidene sorbitol in the mixed material during foaming, thereby increasing the number of bubbles, which are smaller and more uniform, thereby improving the compression resistance of the product. When the mixed material is fully melted and mixed, after bubbles are generated, the mixed material is extruded through the die of the extruder to form a predetermined shape of the extruded board, and the extruded board is quickly cooled by the spray cooling method. At this point, the preparation of the environmentally friendly anti-aging extruded board is completed.

[0053] Embodiment three:

[0054] An environment-friendly anti-aging extruded board, the environment-friendly anti-aging extruded board comprises general-grade polystyrene, a cross-linking agent, a carbon dioxide foaming agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a flame retardant and a colorant, wherein the amount of polystyrene accounts for 90%-98% of the total amount of the environment-friendly anti-aging extruded board, wherein the amount of the cross-linking agent accounts for 0.1%-1% of the total amount of the environment-friendly anti-aging extruded board, wherein the amount of the foaming agent accounts for 3%-8% of the total amount of the environment-friendly anti-aging extruded board, wherein the amount of the antioxidant accounts for 0.1%-0.3% of the total amount of the environment-friendly anti-aging extruded board, wherein the amount of the ultraviolet absorber accounts for 0.1%-0.3% of the total amount of the environment-friendly anti-aging extruded board;

[0055] The amount of light stabilizer accounts for 0.1%-0.5% of the total amount of environmentally friendly anti-aging extruded board, the amount of flame retardant accounts for 3%-8% of the total amount of environmentally friendly anti-aging extruded board, and the amount of colorant accounts for 0.05%-0.3% of the total amount of environmentally friendly anti-aging extruded board;

[0056] The crosslinking agent is γ-aminopropyltriethoxysilane, the antioxidant includes a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is 1010 antioxidant, the auxiliary antioxidant is 168 antioxidant, the ultraviolet absorber is UV-531 ultraviolet absorber, the light stabilizer is hindered amine light stabilizer 770, the flame retardant is melamine cyanurate, the colorant is polystyrene masterbatch, the environment-friendly anti-aging extruded board also includes a nucleating agent and a lubricant, wherein the nucleating agent is dibenzylidene sorbitol, and the amount of dibenzylidene sorbitol accounts for 0.2%-0.5% of the total amount of the environment-friendly anti-aging extruded board, and the lubricant is calcium stearate, and the amount of calcium stearate accounts for 0.1%-0.3% of the total amount of the environment-friendly anti-aging extruded board;

[0057] Specifically, the amount of general-purpose polystyrene accounts for 90% of the total amount of environmentally friendly anti-aging extruded board, the amount of antioxidants accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board (of which 1010 antioxidants account for 0.2% and 168 antioxidants account for 0.1%), the amount of polystyrene masterbatch accounts for 0.2% of the total amount of environmentally friendly anti-aging extruded board, the amount of calcium stearate accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board, and the amount of UV-531 ultraviolet absorber accounts for 0.3% of the total amount of environmentally friendly anti-aging extruded board;

[0058] The amount of hindered amine light stabilizer 770 accounts for 0.2% of the total amount of environmentally friendly anti-aging extruded board, the amount of melamine cyanurate accounts for 4% of the total amount of environmentally friendly anti-aging extruded board, the amount of γ-aminopropyl triethoxysilane accounts for 0.5% of the total amount of environmentally friendly anti-aging extruded board, the amount of dibenzylidene sorbitol accounts for 0.2% of the total amount of environmentally friendly anti-aging extruded board, and the carbon dioxide foaming agent accounts for 4% of the total amount of environmentally friendly anti-aging extruded board;

[0059] Then, the above raw materials were used to prepare the environmentally friendly anti-aging extruded board embodiment 3 according to the following method:

[0060] S1: general-purpose polystyrene, 1010 antioxidant, 168 antioxidant, polystyrene masterbatch and calcium stearate are put into a mixing bin in proportion for mixing, and then the mixture is transported into an extruder through a hopper for heating and mixing, so that the mixture gradually melts under the action of heating and shearing force of the extruder, and as the mixture begins to melt, the polystyrene masterbatch can be more evenly dispersed in the polystyrene, and the addition and combined use of 1010 antioxidant and 168 antioxidant can prevent the general-purpose polystyrene from oxidizing during the processing process, and when the product is used outdoors, the oxidation of the product caused by the influence of light, oxygen and pollutants in the air can be suppressed, thereby extending the service life of the product, and the addition of calcium stearate can effectively reduce the friction of the general-purpose polystyrene during the extrusion process, improve the fluidity of the mixture, avoid the problem of overheating of the mixture due to excessive friction in the screw and barrel of the extruder, and then improve the quality and efficiency of the product;

[0061] S2: In the initial stage of melting the mixed material, UV-531 ultraviolet absorber, hindered amine light stabilizer 770 and melamine cyanurate are sequentially added to the mixed material through a hopper, and further mixed with the mixed material. Through the coordinated effect of UV-531 ultraviolet absorber and hindered amine light stabilizer 770, the aging speed of the product can be reduced when exposed to ultraviolet radiation outdoors, and the purpose of anti-aging is further achieved on the basis of anti-oxidation and environmental protection, and the strength and toughness of the product are continuously maintained;

[0062] Melamine cyanurate, as a flame retardant, reduces the toxic and harmful gases produced by the product during combustion on the basis of traditional flame retardancy, thereby reducing the harm to the air during the combustion of the product in the event of a fire, further improving the environmental protection effect;

[0063] Then, γ-aminopropyltriethoxysilane and dibenzylidene sorbitol are added to the mixed material through a hopper. By adding γ-aminopropyltriethoxysilane, the interfacial bonding force of the components of the product can be enhanced, the cohesive strength of the material is improved, and the compressive and flexural strengths of the product are further improved. Dibenzylidene sorbitol, as a nucleating agent, can not only regularly increase the number of nucleation sites, but also improve the dimensional stability of the product, reduce the probability of deformation of the product during use, thereby reducing the probability of bending and rupture, and further improve the impact strength of the product.

[0064] S3: Then, the foaming agent is pressurized and added into the mixed material through the high-pressure injection system. At this time, the temperature in the extruder is controlled at 180 degrees Celsius, and the pressure of the carbon dioxide foaming agent injection is controlled at 15Mpa-25Mpa, so that the carbon dioxide foaming agent can quickly nucleate at the nucleus site formed by dibenzylidene sorbitol in the mixed material during foaming, thereby increasing the number of bubbles, which are smaller and more uniform, thereby improving the compression resistance of the product. When the mixed material is fully melted and mixed, after bubbles are generated, the mixed material is extruded through the die of the extruder to form a predetermined shape of the extruded board, and the extruded board is quickly cooled by the spray cooling method. At this point, the preparation of the environmentally friendly anti-aging extruded board is completed.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly anti-aging extruded board, characterized by: The composition of the environmentally friendly anti-aging extruded board includes general-grade polystyrene, a cross-linking agent, a carbon dioxide foaming agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a flame retardant and a colorant; Wherein, the amount of polystyrene used accounts for 90%-98% of the total amount of the environmentally friendly anti-aging extruded board; Wherein, the amount of the cross-linking agent is 0.1%-1% of the total amount of the environmentally friendly anti-aging extruded board; The amount of the foaming agent used accounts for 3%-8% of the total amount of the environmentally friendly anti-aging extruded board; The amount of the antioxidant is 0.1%-0.3% of the total amount of the environmentally friendly anti-aging extruded board; The amount of the ultraviolet absorber is 0.1%-0.3% of the total amount of the environmentally friendly anti-aging extruded board; The amount of the light stabilizer is 0.1%-0.5% of the total amount of the environmentally friendly anti-aging extruded board; The amount of the flame retardant is 3% to 8% of the total amount of the environmentally friendly anti-aging extruded board; The amount of the colorant used accounts for 0.05%-0.3% of the total amount of the environmentally friendly anti-aging extruded board.

2. The environmentally friendly anti-aging extruded board according to claim 1, characterized in that: The crosslinking agent is γ-aminopropyltriethoxysilane.

3. The environmentally friendly anti-aging extruded board according to claim 1 is characterized in that: The antioxidant includes a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is 1010 antioxidant and the auxiliary antioxidant is 168 antioxidant.

4. The environmentally friendly anti-aging extruded board according to claim 1, characterized in that: The ultraviolet absorber is UV-531 ultraviolet absorber.

5. The environmentally friendly anti-aging extruded board according to claim 1, characterized in that: The light stabilizer is hindered amine light stabilizer 770.

6. The environmentally friendly anti-aging extruded board according to claim 1, characterized in that: The flame retardant is melamine cyanurate.

7. The environmentally friendly anti-aging extruded board according to claim 1 is characterized by: The colorant is a polystyrene masterbatch.

8. The environmentally friendly anti-aging extruded board according to claim 1, characterized in that: The environmentally friendly anti-aging extruded board also includes a nucleating agent and a lubricant, wherein the nucleating agent is dibenzylidene sorbitol, and the amount of dibenzylidene sorbitol accounts for 0.2%-0.5% of the total amount of the environmentally friendly anti-aging extruded board; the lubricant is calcium stearate, and the amount of calcium stearate accounts for 0.1%-0.3% of the total amount of the environmentally friendly anti-aging extruded board.

9. A method for preparing an environmentally friendly anti-aging extruded board, characterized in that: The method is applicable to the preparation of any one of claims 1 to 8 of the environmentally friendly anti-aging extruded board, comprising the following steps: S1: Putting general-purpose polystyrene, antioxidant, colorant and lubricant into a mixing bin for mixing, and conveying the mixture into an extruder through a hopper, so that the mixture gradually melts under the action of heating and shearing force of the extruder; S2: In the initial stage of melting the mixed material, the ultraviolet absorber, the light stabilizer and the flame retardant are sequentially added to the mixed material through the hopper, and after further mixing with the mixed material, the crosslinking agent and the nucleating agent are added to the mixed material through the hopper, so that the mixed material can be fully mixed with the crosslinking agent and the nucleating agent in a molten state; S3: Then, the foaming agent is pressurized and added into the mixed material through the high-pressure injection system, so that the mixed material is fully melted and mixed, and bubbles are generated. The mixed material is extruded through the die of the extruder to form a predetermined shape of the extruded board, and the extruded board is quickly cooled by the spray cooling method. At this point, the environmentally friendly anti-aging extruded board is prepared.

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