Anti-static straw wood-plastic profile and preparation process thereof

Abstract

The invention relates to the technical field of wood-plastic profiles, in particular to an anti-static straw wood-plastic profile and a preparation process thereof.The anti-static straw wood-plastic profile is characterized by being prepared from, by weight, 40-60 parts of straw, 10-30 parts of thermoplastic, 10-30 parts of antistatic agent, 5-7 parts of compatilizer, 5-7 parts of coupling agent, 4-6 parts of preservative, 3-5 parts of flame retardant and 6-8 parts of flexibilizer. The antistatic agent, the preservative, the flame retardant and the flexibilizer are added in the preparation of the straw wood-plastic profile, so that the antistatic and flame-retardant effects of the straw wood-plastic profile are improved, and the straw wood-plastic profile does not generate electrostatic sparks or burn; meanwhile, by adding the preservative and the flexibilizer, the corrosion resistance, heat resistance and impact resistance of the straw wood-plastic profile can be improved, the structural strength of the straw wood-plastic profile is improved, and the application range of the straw wood-plastic profile is widened.

Description

Technical Field

[0001] The invention relates to an antistatic straw wood-plastic profile, in particular to an antistatic straw wood-plastic profile and a preparation process thereof, belonging to the technical field of wood-plastic profiles. Background Art

[0002] Wood-plastic profiles have the same processing characteristics as wood. They can be sawed, drilled and nailed with ordinary tools. They are very convenient and can be used like ordinary wood. Plastic wood is a composite material synthesized with low-value biomass fibers such as sawdust, wood chips, bamboo chips, rice husks, wheat straw, soybean skins, peanut shells, bagasse, cotton straw and other low-value biomass fibers as main raw materials and plastics. It has the advantages of both plant fibers and plastics and has a wide range of applications, covering almost all areas of use of logs, plastics, plastic steel, aluminum alloys and other similar composite materials. It also solves the problem of recycling waste resources in the plastic and wood industries.

[0003] Wood-plastic profiles are a basic material that has emerged in recent years and can be reversibly recycled. Wood-plastic composite materials have better quality than single wood materials and plastic products, and are an ideal substitute for solid wood. Their emergence can reduce the pollution of waste wood and plastic to the environment, and also adapt to the law of the development of modern material composites to meet the needs of resource utilization.

[0004] Although the existing straw-based wood-plastic profiles have insulating properties, static electricity will accumulate due to friction and other reasons during use, resulting in static sparks. Because they are not flame retardant, they will cause the wood-plastic profiles to burn, posing a safety hazard. In addition, the anti-corrosion performance and tensile strength of straw-based wood-plastic profiles are still not ideal, and they are prone to damage after long-term use, resulting in limited use.

[0005] Therefore, there is an urgent need to improve an anti-static straw wood-plastic profile and its preparation process to solve the above-mentioned problems. Summary of the invention

[0006] The invention aims to provide an antistatic straw wood-plastic profile and a preparation process thereof. Antistatic agent, preservative, flame retardant and toughening agent are added in the preparation of the straw wood-plastic profile, which not only improves the antistatic and flame retardant effects of the straw wood-plastic profile, so that it will not generate static sparks and combustion, but also the addition of preservative and toughening agent can improve the anticorrosion performance, tensile resistance and impact resistance of the straw wood-plastic profile, improve its structural strength, increase its scope of use, and avoid damage after long-term use.

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] An antistatic straw wood-plastic profile is characterized by comprising the following raw materials by weight: 40-60 parts of straw, 10-30 parts of thermoplastic plastic, 10-30 parts of antistatic agent, 5-7 parts of compatibilizer, 5-7 parts of coupling agent, 4-6 parts of preservative, 3-5 parts of flame retardant and 6-8 parts of toughening agent.

[0009] Preferably, the thermoplastic is one or a mixture of any proportion of polyethylene, polypropylene, polyvinyl chloride, polyamide, polycarbonate, polyoxymethylene, polystyrene, polymethyl methacrylate, polyester, etc. By adding thermoplastic, that is, fully mixing with wood powder under hot melting conditions, loose wood powder can be bonded together after cooling to form a composite material with mechanical strength, and it can also play a reinforcing role. Since plastic plays the role of bonding wood powder in the process of wood-plastic composite, the properties of the plastic used play an important role in the properties of the wood-plastic composite material. For wood-plastic profiles of the same size and structure, under the same wood powder ratio and process conditions, the performance of the plastic used can be directly reflected in the performance of the wood-plastic profile.

[0010] Preferably, the antistatic agent is a mixture of one or more of phosphoric acid (such as amide phosphate), inorganic semiconductor salt (such as cuprous and silver halides), carbon black, sodium cellulose sulfate, etc. in any ratio. By adding the antistatic agent, the wood-plastic profile itself is improved to a certain extent in antistatic property, so that it will not generate static sparks during use.

[0011] Preferably, the coupling agent is a mixture of one or more of hydroxyphosphate coupling agent, aminosilane coupling agent, silane coupling agent, titanate coupling agent, etc., in any proportion. By adding the coupling agent, it can react with certain groups in the reinforced wood-plastic profile to form an interface layer between the thermoplastic and the resin matrix, and the interface layer can transfer stress, thereby enhancing the bonding strength between the thermoplastic and the straw, improving the performance of the wood-plastic profile, and at the same time preventing other media from penetrating into the interface, improving the interface state, and being beneficial to the aging resistance, stress resistance and electrical insulation performance of the wood-plastic profile.

[0012] Preferably, the compatibilizer is one or more of GMA grafted PP or GMA grafted PE, PP modified compatibilizer, polyester compatibilizer, PC toughening compatibilizer, etc. By adding the compatibilizer, the bonding force between the thermoplastic and the straw is increased, a stable blending structure is formed, the dispersed phase and the continuous phase are made more uniform, and the comprehensive performance of the blend is improved, thereby achieving the purpose of compatibility between the thermoplastic and the straw.

[0013] Preferably, the preservative is one or a mixture of two or more of copper naphthenate, boride, ortho-dichlorobenzene in any proportion. By adding the preservative, the growth of fungi and bacteria in the wood-plastic profile can be inhibited, the wood-plastic profile can be prevented from decaying and decomposing, and the pores and fine cracks of the wood-plastic profile can be filled, thereby improving the density and hardness of the wood-plastic profile, and increasing the compressive strength and bending strength of the wood-plastic profile.

[0014] Preferably, the flame retardant is one or more of ammonium phosphate, ammonium phosphate polyurethane, aluminum hydroxide, etc. By adding the flame retardant, the flame resistance of the wood-plastic profile can be improved, the flame retardant effect can be exerted, and the wood-plastic profile can be prevented from burning.

[0015] Preferably, the toughening agent is a mixture of one or more of polyamide resin, polyurethane resin, polysulfone resin, acetal resin, etc. mixed in any proportion. By adding the toughening agent, the tensile strength, fatigue resistance, and insect resistance of the wood-plastic profile can be improved, and the stability and safety of the wood-plastic profile can be improved, thereby increasing the service life of the wood-plastic profile.

[0016] Preferably, a preparation process of an anti-static straw wood-plastic profile is characterized by comprising the following steps:

[0017] S1, washing and drying the straw, putting it into a pulverizer for crushing, and putting the crushed straw fiber into a grinder for grinding into powder;

[0018] S2, adding thermoplastic plastic, antistatic agent, compatibilizer, coupling agent, preservative, flame retardant and toughening agent into a mixing device for heating and stirring, stirring for 40-60 minutes at a heating temperature of 160°C-180°C, and then putting the obtained mixture into a twin-screw granulator for granulation;

[0019] S3, mixing the powdered straw raw material and the mixed material obtained in S2, stirring for 30-50 minutes at a heating temperature of 80° C.-100° C., and then putting the obtained mixed material into an extruder for extrusion molding to obtain an antistatic straw wood-plastic profile.

[0020] Preferably, the powdered straw raw material in S1 has a grinding radius of 300-500 mesh.

[0021] The present invention has at least the following beneficial effects:

[0022] By adding antistatic agents, preservatives, flame retardants and toughening agents in the preparation of straw wood plastic profiles, not only the antistatic and flame retardant effects of the straw wood plastic profiles are improved, so that they will not generate static sparks and combustion, but the addition of preservatives and toughening agents can also improve the anti-corrosion performance, tensile resistance and impact resistance of the straw wood plastic profiles, improve their structural strength, increase their scope of use, and avoid damage after long-term use.

[0023] By adding thermoplastics, that is, fully mixing with wood powder under hot melt conditions, the loose wood powder can be bonded together after cooling to form a composite material with mechanical strength, and it can also play a reinforcing role. Since plastic plays the role of bonding wood powder in the wood-plastic composite process, the properties of the plastic used play an important role in the properties of the wood-plastic composite material. For wood-plastic profiles of the same size and structure, under the same wood powder ratio and process conditions, the performance of the plastic used can be directly reflected in the performance of the wood-plastic profiles.

[0024] By adding antistatic agent, the antistatic property of wood-plastic profile is improved to a certain extent, so that it will not generate static sparks during use.

[0025] By adding coupling agent, it can react with certain groups in the reinforced wood-plastic profiles to form an interface layer between the thermoplastic and the resin matrix. The interface layer can transfer stress, thereby enhancing the bonding strength between the thermoplastic and the straw and improving the performance of the wood-plastic profiles. At the same time, it can also prevent other media from penetrating into the interface, improve the interface state, and is beneficial to the aging resistance, stress resistance and electrical insulation properties of the wood-plastic profiles.

[0026] By adding compatibilizer, the bonding force between thermoplastics and straw is increased, a stable blending structure is formed, the dispersed phase and the continuous phase are made more uniform, and the comprehensive performance of the blend is improved, thereby achieving the purpose of compatibility between thermoplastics and straw.

[0027] By adding preservatives, the growth of fungi and bacteria in WPC profiles can be inhibited, and the decay and decomposition of WPC profiles can be prevented. At the same time, the pores and fine cracks of WPC profiles can be filled, thereby improving the density and hardness of WPC profiles, and increasing the compressive strength and bending strength of WPC profiles.

[0028] By adding flame retardants, the flame resistance of wood-plastic profiles can be improved, the flame retardant effect can be exerted, and the wood-plastic profiles can be prevented from burning.

[0029] By adding toughening agents, the tensile strength, fatigue resistance, and insect resistance of wood-plastic profiles can be improved, and the stability and safety of wood-plastic profiles can be improved, thereby increasing the service life of wood-plastic profiles.

[0030] By setting thermoplastic plastics, antistatic agents, compatibilizers, coupling agents, preservatives, flame retardants and toughening agents as one or more combinations, the diversity of raw material selection in the preparation process of straw wood plastic profiles is increased, the limitations in the preparation process of straw wood plastic profiles are reduced, and in the repeated preparation comparison of multiple raw materials, it is also convenient to obtain the preparation combination of straw wood plastic profiles with the best performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0032] Figure 1 It is a flow chart of the preparation process of the present invention. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Embodiment 1, as Figure 1 As shown, this embodiment provides an anti-static straw wood-plastic profile and a preparation process embodiment thereof.

[0035] An antistatic straw wood-plastic profile, characterized in that: by weight, it comprises the following raw materials: 40 parts of straw, 10 parts of thermoplastic plastic, 10 parts of antistatic agent, 5 parts of compatibilizer, 5 parts of coupling agent, 4 parts of preservative, 3 parts of flame retardant, and 6 parts of toughening agent;

[0036] The specific preparation method comprises the following steps:

[0037] S1, washing the straw and then drying it in a dryer, then putting the dried straw into a grinder to grind it into straw fiber, and then putting the crushed straw fiber into a grinder to grind it into a powder with a radius of 300 mesh;

[0038] S2, adding thermoplastic plastic, antistatic agent, compatibilizer, coupling agent, preservative, flame retardant and toughening agent into a mixing device for heating and stirring, stirring for 40 minutes at a heating temperature of 160° C., and then putting the obtained mixture into a twin-screw granulator for granulation;

[0039] S3, mixing the powdered straw raw material and the mixed material obtained in S2, stirring for 30 minutes at a heating temperature of 80° C., and then putting the obtained mixed material into an extruder for extrusion molding to obtain an antistatic straw wood-plastic profile.

[0040] Embodiment 2, as Figure 1 As shown, this embodiment provides an anti-static straw wood-plastic profile and a preparation process embodiment thereof.

[0041] An antistatic straw wood-plastic profile, characterized in that: by weight, it comprises the following raw materials: 50 parts of straw, 20 parts of thermoplastic plastic, 20 parts of antistatic agent, 6 parts of compatibilizer, 6 parts of coupling agent, 5 parts of preservative, 4 parts of flame retardant, and 7 parts of toughening agent;

[0042] The specific preparation method comprises the following steps:

[0043] S1, washing the straw and then drying it in a dryer, then putting the dried straw into a grinder to grind it into straw fiber, and then putting the crushed straw fiber into a grinder to grind it into a powder with a radius of 400 mesh;

[0044] S2, adding thermoplastic plastic, antistatic agent, compatibilizer, coupling agent, preservative, flame retardant and toughening agent into a mixing device for heating and stirring, stirring for 50 minutes at a heating temperature of 170° C., and then putting the obtained mixture into a twin-screw granulator for granulation;

[0045] S3, mixing the powdered straw raw material and the mixed material obtained in S2, stirring for 40 minutes at a heating temperature of 90° C., and then putting the obtained mixed material into an extruder for extrusion molding to obtain an antistatic straw wood-plastic profile.

[0046] Embodiment 3, as Figure 1 As shown, this embodiment provides an anti-static straw wood-plastic profile and a preparation process embodiment thereof.

[0047] An antistatic straw wood-plastic profile, characterized in that: by weight, it comprises the following raw materials: 60 parts of straw, 30 parts of thermoplastic plastic, 30 parts of antistatic agent, 7 parts of compatibilizer, 7 parts of coupling agent, 6 parts of preservative, 5 parts of flame retardant, and 8 parts of toughening agent;

[0048] The specific preparation method comprises the following steps:

[0049] S1, washing the straw and then drying it in a dryer, then putting the dried straw into a grinder to grind it into straw fiber, and then putting the crushed straw fiber into a grinder to grind it into a powder with a radius of 500 mesh;

[0050] S2, adding thermoplastic plastic, antistatic agent, compatibilizer, coupling agent, preservative, flame retardant and toughening agent into a mixing device for heating and stirring, stirring for 60 minutes at a heating temperature of 180° C., and then putting the obtained mixture into a twin-screw granulator for granulation;

[0051] S3, mixing the powdered straw raw material and the mixed material obtained in S2, stirring for 50 minutes at a heating temperature of 90° C., and then putting the obtained mixed material into an extruder for extrusion molding to obtain an antistatic straw wood-plastic profile.

[0052] The properties of the straw wood-plastic profiles prepared in Examples 1-3 are as follows:

[0053] The surface resistivity of the straw wood plastic profile in Example 1 is 1.5×10 6 , the tensile strength is 18MPa.

[0054] The surface resistivity of the straw wood plastic profile in Example 2 is 2×10 6 , the tensile strength is 17.5MPa.

[0055] The surface resistivity of the straw wood plastic profile in Example 3 is 2.5×10 6 , the tensile strength is 19MPa.

[0056] It can be seen that the straw wood-plastic profile prepared in Example 3 has good antistatic properties and toughness.

[0057] In summary, in this embodiment, according to an antistatic straw wood plastic profile and its preparation process of this embodiment, by adding antistatic agent, preservative, flame retardant and toughening agent in the preparation of straw wood plastic profile, not only the antistatic and flame retardant effects of straw wood plastic profile are improved, so that it will not generate static sparks and combustion, but also the addition of preservative and toughening agent can improve the anti-corrosion performance, tensile strength and impact resistance of straw wood plastic profile, improve its structural strength and increase its scope of use, avoid damage after long-term use, by adding thermoplastic plastic, that is, fully mixing with wood powder under hot melting conditions, cooling After that, the loose wood powder can be bonded together to form a composite material with mechanical strength, and it can also play a reinforcing role. Since the plastic plays the role of bonding wood powder in the wood-plastic composite process, the properties of the plastic used play an important role in the properties of the wood-plastic composite material. For wood-plastic profiles of the same size and structure, under the same wood powder ratio and process conditions, the performance of the plastic used can be directly reflected in the performance of the wood-plastic profile. By adding antistatic agents, the wood-plastic profiles themselves have a certain degree of antistatic properties, so that they will not generate static sparks during use. By adding coupling agents Adding compatibilizer can not only react with certain groups in the reinforced wood-plastic profile, but also form an interface layer between the thermoplastic and the resin matrix. The interface layer can transfer stress, thereby enhancing the bonding strength between the thermoplastic and the straw, and improving the performance of the wood-plastic profile. At the same time, it can also prevent other media from penetrating into the interface, improve the interface state, and be beneficial to the aging resistance, stress resistance and electrical insulation performance of the wood-plastic profile. By adding compatibilizer, the bonding force between the thermoplastic and the straw is increased, a stable blending structure is formed, the dispersed phase and the continuous phase are more uniform, and the comprehensive performance of the blend is improved, thereby achieving the thermoplastic and straw. For the purpose of compatibility with straw, the addition of preservatives can inhibit the growth of fungi and bacteria in the wood-plastic profiles, prevent the wood-plastic profiles from decaying and decomposing, and fill the pores and fine cracks of the wood-plastic profiles, thereby improving the density and hardness of the wood-plastic profiles, increasing the compressive strength and bending strength of the wood-plastic profiles. The addition of flame retardants can improve the flame resistance of the wood-plastic profiles, play a flame retardant role, and prevent the wood-plastic profiles from burning. The addition of toughening agents can improve the tensile strength, fatigue resistance, and insect resistance of the wood-plastic profiles, improve the stability and safety of the wood-plastic profiles, and increase the service life of the wood-plastic profiles. By setting thermoplastic plastics, antistatic agents, compatibilizers, coupling agents, preservatives, flame retardants, and toughening agents as one or more combinations, the diversity of raw material selection in the preparation process of straw wood-plastic profiles is increased, and the limitations in the preparation process of straw wood-plastic profiles are reduced. In addition, in the repeated preparation and comparison of multiple raw materials, it is also convenient to obtain the preparation combination of straw wood-plastic profiles with the best performance.

[0058] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0059] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0060] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. An anti-static straw wood-plastic profile, characterized in that: The invention comprises the following raw materials by weight: 40-60 parts of straw, 10-30 parts of thermoplastic plastic, 10-30 parts of antistatic agent, 5-7 parts of compatibilizer, 5-7 parts of coupling agent, 4-6 parts of preservative, 3-5 parts of flame retardant and 6-8 parts of toughening agent.

2. The antistatic straw wood-plastic profile according to claim 1, characterized in that: The thermoplastic plastic is one or a mixture of several of polyethylene, polypropylene, polyvinyl chloride, polyamide, polycarbonate, polyoxymethylene, polystyrene, polymethyl methacrylate, polyester, etc. in any ratio.

3. The antistatic straw wood-plastic profile according to claim 1, characterized in that: The antistatic agent is one or a mixture of several of phosphoric acid (such as amide phosphate), inorganic semiconductor salt (such as cuprous and silver halides), carbon black, sodium cellulose sulfate, etc. in any ratio.

4. The antistatic straw wood-plastic profile according to claim 1, characterized in that: The coupling agent is one or a mixture of two or more of a hydroxyphosphate coupling agent, an aminosilane coupling agent, a silane coupling agent, a titanate coupling agent, etc., in any proportion.

5. The antistatic straw wood-plastic profile according to claim 1, characterized in that: The compatibilizer is one or more of GMA grafted PP or GMA grafted PE, PP modified compatibilizer, polyester compatibilizer, PC toughening compatibilizer and the like.

6. The antistatic straw wood-plastic profile according to claim 1, characterized in that: The preservative is one or a mixture of two or more of copper cyclohexaneate, boride, o-dichlorobenzene, etc. in any proportion.

7. The antistatic straw wood-plastic profile according to claim 1, characterized in that: The flame retardant is one or more of ammonium phosphate, ammonium phosphate polyurethane, aluminum hydroxide and the like.

8. The antistatic straw wood-plastic profile according to claim 1, characterized in that: The toughening agent is a mixture of one or more of polyamide resin, polyurethane resin, polysulfone resin, acetal resin, etc. mixed in any proportion.

9. The preparation process of the antistatic straw wood-plastic profile according to claim 1, characterized in that: The following steps are involved: S1, washing and drying the straw, putting it into a pulverizer for crushing, and putting the crushed straw fiber into a grinder for grinding into powder; S2, adding thermoplastic plastic, antistatic agent, compatibilizer, coupling agent, preservative, flame retardant and toughening agent into a mixing device for heating and stirring, stirring for 40-60 minutes at a heating temperature of 160°C-180°C, and then putting the obtained mixture into a twin-screw granulator for granulation; S3, mixing the powdered straw raw material and the mixed material obtained in S2, stirring for 30-50 minutes at a heating temperature of 80° C.-100° C., and then putting the obtained mixed material into an extruder for extrusion molding to obtain an antistatic straw wood-plastic profile.

10. The process for preparing an antistatic straw wood-plastic profile according to claim 9, characterized in that: The powdered straw raw material in S1 has a grinding radius of 300-500 meshes.

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