Production process for producing waste spinning composite plate by using waste clothes

Abstract

The invention relates to the field of composite plates, and discloses a production process for producing a waste spinning composite plate by using waste clothes, the waste spinning composite plate comprises waste clothes, waste polyvinyl chloride, high density polyethylene, modified lignin, modified composite particles, an antioxidant, a heat stabilizer and a lubricant; the modified lignin is prepared by reacting DOPO with 2-octenyl succinic anhydride and then grafting with lignin; the modified composite particles are prepared by depositing mesoporous silica on the surface of aluminum hydroxide coated ammonium polyphosphate by utilizing a pore forming agent and tetraethyl orthosilicate and modifying through a fluorine-containing copolymer. Fibers in waste clothes are molten into an organic material and extruded into a plate, and the mechanical strength of the plate is improved by utilizing the strength of the fibers; in addition, due to the addition of the modified lignin and the modified composite particles, the board is endowed with excellent flame retardance, water resistance, ultraviolet yellowing resistance and mechanical properties.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material plates, and in particular relates to a production process for producing waste textile composite material plates by using waste clothes. Background Art

[0002] In recent years, with the rapid development of the textile industry, the total amount of waste textiles has increased. Waste textiles are clothing and industrial and home textile products that have been discarded after production and daily consumption. Due to various limiting factors, the recycling rate of waste textile products is low, and most of the treatment methods are incineration or landfill, which not only wastes a lot of resources, but also pollutes air and groundwater resources.

[0003] Using waste clothes to produce waste textile composite boards is a reasonable and effective use of waste textiles. It solves the resource shortage crisis while achieving resource recycling and reducing environmental pollution, and has important economic and social value. However, the existing waste textile composite boards produced from waste clothes have problems such as poor mechanical properties, easy combustion when exposed to fire, easy deformation when absorbing moisture, etc., which greatly limits their application scenarios. In addition, their weather resistance is weak, and they are prone to yellowing when exposed to ultraviolet rays for a long time, which in turn affects the performance of the board and greatly reduces the service life of the board. Summary of the invention

[0004] In order to solve the deficiencies mentioned in the above-mentioned background technology, the purpose of the present invention is to provide a production process for producing waste-spinning composite boards from waste clothes, using waste clothes, waste polyvinyl chloride and high-density polyethylene as the main base materials, adding modified lignin, modified composite particles and other additives to prepare waste-spinning composite boards, and melting the fibers in the waste clothes into organic materials and extruding them into boards, thereby utilizing the fiber strength of the fibers to improve the mechanical strength of the boards. In addition, the addition of modified lignin and modified composite particles can give the boards excellent flame retardancy, water resistance, UV yellowing resistance and mechanical properties.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A waste textile composite board produced from waste clothes, comprising the following components by weight: 40-60 parts of waste clothes, 10-20 parts of waste polyvinyl chloride, 15-25 parts of high-density polyethylene, 3-8 parts of modified lignin, 5-10 parts of modified composite particles, 3-5 parts of antioxidant, 2-6 parts of heat stabilizer, and 1-3 parts of lubricant; The modified lignin is prepared by grafting DOPO and 2-octenyl succinic anhydride with lignin after an addition reaction using a chemical reaction; the modified composite particles are prepared by depositing a silicon dioxide layer with a mesoporous structure on the surface of aluminum hydroxide-coated ammonium polyphosphate using hexadecyltrimethylammonium bromide and tetraethyl orthosilicate, and are modified by a copolymer of 2-(perfluorohexyl)ethyl methacrylate, glycidyl methacrylate and 3-(methacryloyloxy)propyltrimethoxysilane.

[0006] Preferably, the antioxidant is one or more combinations of antioxidant 1098, antioxidant 1076, and antioxidant 1010; the heat stabilizer is calcium zinc stabilizer; and the lubricant is polyethylene wax.

[0007] Preferably, the waste clothes include a mixture of one or more of cotton, linen, wool, chemical fiber, polyester, nylon, spandex, blended, silk, leather, and rubber.

[0008] Preferably, the preparation method of the modified lignin comprises the following steps: A. DOPO, 2-octenylsuccinic anhydride and toluene are placed in a reactor, heated to 85-95° C., and stirred to mix. Azobisisobutyronitrile is dissolved in toluene and added to the reactor, and stirred to react for 20-24 hours. After the reaction is completed, the flame retardant hydrophobic agent is prepared by suction filtration, rotary evaporation and drying. B. Disperse lignin in deionized water to obtain a suspension, dissolve a flame retardant hydrophobic agent in ethanol and add it to the dispersion, adjust the pH value of the system to 8-8.5, and react at 30-55°C for 1-3 hours. After the reaction is completed, transfer to ethanol for precipitation. Wash, filter and dry the precipitate to prepare modified lignin.

[0009] Preferably, in step A, the molar ratio of DOPO to 2-octenylsuccinic anhydride is 1:1-1.3.

[0010] Preferably, in step B, the mass ratio of lignin to the flame retardant hydrophobic agent is 4-5:1.

[0011] Preferably, the method for preparing the modified composite particles comprises the following steps: (1) Dispersing ammonium polyphosphate in ethanol to obtain a suspension, dissolving anhydrous aluminum chloride in deionized water, and then adding the solution to the suspension and stirring evenly, then adding ammonia water to adjust the pH value of the system to 8-9, placing the solution in a constant temperature water bath at 55-65°C for 1-3 hours, and finally filtering, washing, and drying the precipitated product to obtain aluminum hydroxide-coated ammonium polyphosphate; (2) adding aluminum hydroxide-coated ammonium polyphosphate and hexadecyltrimethylammonium bromide to a mixed solution of ethanol and deionized water, uniformly dispersing by ultrasonication, adding an ammonia solution to adjust the pH value of the system to 8-9, heating to 30-45°C, adding tetraethyl orthosilicate, stirring and reacting for 10-12 hours, and after the reaction is completed, centrifuging, washing, and drying to prepare composite particles; (3) 2-(Perfluorohexyl)ethyl methacrylate, glycidyl methacrylate and 3-(methacryloyloxy)propyltrimethoxysilane were added to ethanol solvent and mixed evenly. Azobisisobutyronitrile was added under nitrogen atmosphere and the mixture was reacted at 70-85°C for 6-8 hours to obtain a polymer solution. The composite particles were ultrasonically dispersed in ethanol, and then the polymer solution was added and stirred for reaction for 10-12 hours. After the reaction was completed, the modified composite particles were filtered, washed and dried.

[0012] Preferably, in step (2), the addition ratio of aluminum hydroxide-coated ammonium polyphosphate, hexadecyltrimethylammonium bromide, ethanol, deionized water and tetraethyl orthosilicate is 4-7 g: 1 g: 10-15 mL: 40-60 mL: 4-6 g.

[0013] Preferably, in step (3), the mass ratio of 2-(perfluorohexyl)ethyl methacrylate, glycidyl methacrylate and 3-(methacryloyloxy)propyltrimethoxysilane is 5-7:9-12:1.

[0014] A production process for producing a waste textile composite board from waste clothes as described above comprises the following steps: S1, collecting waste clothes, crushing and mixing the waste clothes and waste polyvinyl chloride by weight, and then extruding them in an extruder, and finally cooling and crushing them to obtain pre-treated crushed materials; S2. Mix parts by weight of high-density polyethylene, modified lignin, modified composite particles, antioxidant, heat stabilizer, lubricant and pre-treated crushed materials, and melt-extrude them through an extruder to prepare a waste textile composite board.

[0015] Beneficial effects of the present invention: The present invention utilizes waste clothing, waste polyvinyl chloride and high-density polyethylene as main substrates, adds modified lignin, modified composite particles, antioxidants, heat stabilizers and lubricants to prepare waste textile composite boards, melts fibers in the waste clothing into organic materials, and extrude them into boards, thereby utilizing the fiber strength of the fibers to improve the mechanical strength of the boards. In addition, the addition of modified lignin and modified composite particles can give the boards excellent flame retardancy, water resistance, UV yellowing resistance and mechanical properties.

[0016] The present invention utilizes DOPO and 2-octenyl succinic anhydride to react to prepare a flame retardant hydrophobic agent, and then esterifies the hydroxyl group in the lignin structure with the anhydride group in the flame retardant hydrophobic agent structure, thereby introducing a hydrophobic alkenyl long chain and a flame retardant component into the lignin structure to prepare a modified lignin, which is beneficial to the dispersion of lignin. At the same time, lignin, as a commonly used phenolic polymer, has ultraviolet blocking properties, and due to the scavenging effect of its phenolic structure on oxygen-containing active free radicals, it has antioxidant activity. The present invention adds the modified lignin to the matrix, which can improve the flame retardancy, water resistance and ultraviolet yellowing resistance of the board.

[0017] The invention firstly synthesizes aluminum hydroxide particles in situ on the surface of ammonium polyphosphate to improve the hygroscopicity of ammonium polyphosphate, and the two can synergistically flame retardant, and then, through the interface induced synergistic self-assembly of hexadecyltrimethylammonium bromide rod-shaped micelles and tetraethyl orthosilicate hydrolyzate under electrostatic action, a silicon dioxide layer with a mesoporous structure is further coated on the surface of the aluminum hydroxide coated ammonium polyphosphate to prepare composite particles, wherein the mesoporous silicon dioxide has the characteristics of light weight, sound insulation and high mechanical strength, and in addition, the mesoporous silicon dioxide layer and the aluminum hydroxide coated ammonium polyphosphate have a synergistic flame retardant effect, and then the composite particles are modified by a copolymer of 2-(perfluorohexyl)ethyl methacrylate, glycidyl methacrylate and 3-(methacryloyloxy)propyltrimethoxysilane, the compatibility and dispersibility of the modified composite particles in the matrix are improved, and the flame retardancy, water resistance and mechanical properties of the plate are further improved. DETAILED DESCRIPTION

[0018] The following will be combined with 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.

[0019] Example 1 A method for preparing modified lignin comprises the following steps: A. Take 21.6g DOPO, 25.2g 2-octenyl succinic anhydride and 100mL toluene in a reactor, heat to 90°C and stir to mix, take 0.2g azobisisobutyronitrile and dissolve it in 20mL toluene and add it to the reactor, stir and react for 24h, and after the reaction is completed, filter, rotary evaporate and dry to prepare a flame retardant hydrophobic agent; B. Take 5g of lignin and disperse it in 200mL of deionized water to obtain a suspension. Take 1g of a flame retardant hydrophobic agent and dissolve it in 5mL of ethanol and add it to the dispersion. Use 0.1mol / L of sodium hydroxide solution and 0.1mol / L of hydrochloric acid solution to maintain the pH value of the system at 8.5. Place it at 40°C to react for 2h. After the reaction is completed, move it to ethanol for precipitation. The precipitate is washed, filtered and dried to prepare modified lignin.

[0020] Example 2 A method for preparing modified composite particles comprises the following steps: 50 g of ammonium polyphosphate was dispersed in 200 mL of ethanol to obtain a suspension, 2 g of anhydrous aluminum chloride was dissolved in 10 mL of deionized water and then added to the suspension and stirred evenly, then ammonia water was added to adjust the pH value of the system to 8, and the system was placed in a constant temperature water bath at 60° C. and allowed to stand for precipitation for 2 h, and finally the precipitated product was filtered, washed, and dried to prepare aluminum hydroxide-coated ammonium polyphosphate; (2) 5 g of aluminum hydroxide-coated ammonium polyphosphate and 1 g of hexadecyltrimethylammonium bromide were added to a mixed solution of 10 mL of ethanol and 40 mL of deionized water, and ultrasonically dispersed uniformly. A 25% ammonia solution was added to adjust the pH value of the system to 8. The temperature was raised to 40°C, and 5 g of tetraethyl orthosilicate was added and stirred for 12 h. After the reaction was completed, the composite particles were prepared by centrifugation, washing, and drying. (3) Take 5.6g of 2-(perfluorohexyl)ethyl methacrylate, 9.5g of glycidyl methacrylate and 1g of 3-(methacryloyloxy)propyltrimethoxysilane, add them into 50mL of ethanol solvent and mix them evenly. Add 0.05g of azobisisobutyronitrile under nitrogen atmosphere, and react at 80℃ for 7h to obtain a polymer solution. Take 7g of composite particles and ultrasonically disperse them in 40mL of ethanol. Then add 3.5g of the polymer solution and stir to react for 12h. After the reaction is completed, filter, wash and dry to prepare modified composite particles.

[0021] Example 3 A method for producing a waste textile composite board using waste clothes comprises the following components in parts by weight: 44 parts of waste clothes, 12 parts of waste polyvinyl chloride, 15 parts of high-density polyethylene, 3 parts of modified lignin prepared in Example 1, 5 parts of modified composite particles prepared in Example 2, 3 parts of antioxidant 1098, 3 parts of calcium zinc stabilizer, and 1 part of lubricant polyethylene wax.

[0022] The above-mentioned production process of producing waste textile composite board from waste clothes comprises the following steps: S1, collecting waste clothes, crushing and mixing the waste clothes and waste polyvinyl chloride by weight, and then extruding them in an extruder, and finally cooling and crushing them to obtain pre-treated crushed materials; S2. Mix parts by weight of high-density polyethylene, modified lignin, modified composite particles, antioxidant, heat stabilizer, lubricant and pre-treated crushed materials, and melt-extrude them through an extruder to prepare a waste textile composite board.

[0023] Example 4 A method for producing a waste textile composite board using waste clothing comprises the following components in parts by weight: 54 parts of waste clothes, 17 parts of waste polyvinyl chloride, 20 parts of high-density polyethylene, 5 parts of modified lignin prepared in Example 1, 8 parts of modified composite particles prepared in Example 2, 4 parts of antioxidant 1076, 4 parts of calcium zinc stabilizer, and 2 parts of lubricant polyethylene wax.

[0024] The above-mentioned production process of producing waste textile composite board material from waste clothes is the same as that in Example 3.

[0025] Example 5 A method for producing a waste textile composite board using waste clothing comprises the following components in parts by weight: 58 parts of waste clothes, 20 parts of waste polyvinyl chloride, 23 parts of high-density polyethylene, 8 parts of modified lignin prepared in Example 1, 10 parts of modified composite particles prepared in Example 2, 5 parts of antioxidant 1010, 5 parts of calcium zinc stabilizer, and 3 parts of lubricant polyethylene wax.

[0026] The above-mentioned production process of producing waste textile composite board material from waste clothes is the same as that in Example 3.

[0027] Comparative Example 1 A waste textile composite board produced from waste clothes comprises the following components in parts by weight: 54 parts of waste clothes, 17 parts of waste polyvinyl chloride, 20 parts of high-density polyethylene, 5 parts of lignin, 8 parts of modified composite particles prepared in Example 2, 4 parts of antioxidant 1076, 4 parts of calcium zinc stabilizer, and 2 parts of lubricant polyethylene wax.

[0028] The above-mentioned production process of producing waste textile composite board material from waste clothes is the same as that in Example 3.

[0029] Comparative Example 2 A waste textile composite board produced from waste clothes comprises the following components in parts by weight: 54 parts of waste clothes, 17 parts of waste polyvinyl chloride, 20 parts of high-density polyethylene, 5 parts of modified lignin prepared in Example 1, 8 parts of aluminum hydroxide-coated ammonium polyphosphate prepared in Example 2, 4 parts of antioxidant 1076, 4 parts of calcium zinc stabilizer, and 2 parts of lubricant polyethylene wax.

[0030] The above-mentioned production process of producing waste textile composite board material from waste clothes is the same as that in Example 3.

[0031] Comparative Example 3 A waste textile composite board produced from waste clothes comprises the following components in parts by weight: 54 parts of waste clothes, 17 parts of waste polyvinyl chloride, 20 parts of high-density polyethylene, 5 parts of modified lignin prepared in Example 1, 8 parts of composite particles prepared in Example 2, 4 parts of antioxidant 1076, 4 parts of calcium zinc stabilizer, and 2 parts of lubricant polyethylene wax.

[0032] The above-mentioned production process of producing waste textile composite board material from waste clothes is the same as that in Example 3.

[0033] Performance Testing The waste textile composite boards prepared in Examples 3-5 and Comparative Examples 1-3 were subjected to performance tests: (1) Mechanical properties testing: The tensile strength was tested according to GB / T 1040.1-2018; the flexural strength was tested according to GB / T9341-2008, with a bending rate of 2 mm / min; the cantilever beam notched impact strength was tested according to GB / T 1843-2008. The data results are shown in Table 1.

[0034] (2) Flame retardant performance test: The limiting oxygen index test was conducted in accordance with GB / T 2406.2-2009, and the data results are shown in Table 1.

[0035] (3) Hydrophobic performance test: The hydrophobic performance of the plate was tested using a contact angle measuring instrument, and the data results are shown in Table 1.

[0036] (4) Resistance to UV yellowing: The performance of the board was tested in a UV aging test chamber under a UV light environment of 270-380nm. The test results were presented in the form of color change. The data results are shown in Table 1.

[0037] Table 1 Test results of sample performance

[0038] As can be seen from the data in Table 1, the board prepared in Examples 3-5 of the present invention has excellent mechanical properties, flame retardancy, water resistance and resistance to ultraviolet yellowing. In Comparative Example 1, the lignin was not modified, and the measured limiting oxygen index and water contact angle were lower than those of Examples 3-5, because the flame retardant hydrophobic agent was not grafted, and the mechanical properties were slightly worse than those of Examples 3-5, resulting in slight yellowing, which may be due to the agglomeration of lignin, resulting in its performance degradation. In Comparative Example 2, the modified composite particles were replaced with aluminum hydroxide-coated ammonium polyphosphate in equal amounts, and the measured mechanical properties, flame retardancy and water resistance were lower than those of Examples 3-5, because the surface of aluminum hydroxide-coated ammonium polyphosphate was not coated with mesoporous silica, and the copolymer was not grafted for modification. In Comparative Example 3, the composite particles were not modified, and the measured mechanical properties and water resistance were lower than those of Examples 3-5, indicating that the grafting of the copolymer is conducive to the dispersion of the composite particles, and the water resistance and mechanical properties of the board can be improved.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for producing waste textile composite board using waste clothes, characterized in that: The invention comprises the following components by weight: 40-60 parts of waste clothes, 10-20 parts of waste polyvinyl chloride, 15-25 parts of high-density polyethylene, 3-8 parts of modified lignin, 5-10 parts of modified composite particles, 3-5 parts of antioxidant, 2-6 parts of heat stabilizer and 1-3 parts of lubricant; The modified lignin is prepared by grafting DOPO and 2-octenyl succinic anhydride with lignin after an addition reaction using a chemical reaction; the modified composite particles are prepared by depositing a silicon dioxide layer with a mesoporous structure on the surface of aluminum hydroxide-coated ammonium polyphosphate using hexadecyltrimethylammonium bromide and tetraethyl orthosilicate, and are modified by a copolymer of 2-(perfluorohexyl)ethyl methacrylate, glycidyl methacrylate and 3-(methacryloyloxy)propyltrimethoxysilane.

2. The method for producing waste textile composite board from waste clothes according to claim 1, characterized in that: The antioxidant is one or more combinations of antioxidant 1098, antioxidant 1076, and antioxidant 1010; the heat stabilizer is calcium zinc stabilizer; and the lubricant is polyethylene wax.

3. The method for producing waste textile composite board from waste clothes according to claim 1, characterized in that: The waste clothes include one or more mixtures of cotton, linen, wool, chemical fiber, polyester, nylon, spandex, blended, silk, leather, and rubber.

4. The method for producing waste textile composite board from waste clothes according to claim 1, characterized in that: The preparation method of the modified lignin comprises the following steps: A. DOPO, 2-octenylsuccinic anhydride and toluene are placed in a reactor, heated to 85-95° C., and stirred to mix. Azobisisobutyronitrile is dissolved in toluene and added to the reactor, and stirred to react for 20-24 hours. After the reaction is completed, the flame retardant hydrophobic agent is prepared by suction filtration, rotary evaporation and drying. B. Disperse lignin in deionized water to obtain a suspension, dissolve a flame retardant hydrophobic agent in ethanol and add it to the dispersion, adjust the pH value of the system to 8-8.5, and react at 30-55°C for 1-3 hours. After the reaction is completed, transfer to ethanol for precipitation. Wash, filter and dry the precipitate to prepare modified lignin.

5. The method for producing waste textile composite board from waste clothes according to claim 4, characterized in that: In the step A, the molar ratio of DOPO to 2-octenyl succinic anhydride is 1:1-1.

3.

6. The method of producing waste textile composite board from waste clothes according to claim 4, characterized in that: In the step B, the mass ratio of lignin to the flame retardant hydrophobic agent is 4-5:

1.

7. The method of producing waste textile composite board from waste clothes according to claim 1, characterized in that: The preparation method of the modified composite particles comprises the following steps: (1) Dispersing ammonium polyphosphate in ethanol to obtain a suspension, dissolving anhydrous aluminum chloride in deionized water, and then adding the solution to the suspension and stirring evenly, then adding ammonia water to adjust the pH value of the system to 8-9, placing the solution in a constant temperature water bath at 55-65°C for 1-3 hours, and finally filtering, washing, and drying the precipitated product to obtain aluminum hydroxide-coated ammonium polyphosphate; (2) adding aluminum hydroxide-coated ammonium polyphosphate and hexadecyltrimethylammonium bromide to a mixed solution of ethanol and deionized water, uniformly dispersing by ultrasonication, adding an ammonia solution to adjust the pH value of the system to 8-9, heating to 30-45°C, adding tetraethyl orthosilicate, stirring and reacting for 10-12 hours, and after the reaction is completed, centrifuging, washing, and drying to prepare composite particles; (3) 2-(Perfluorohexyl)ethyl methacrylate, glycidyl methacrylate and 3-(methacryloyloxy)propyltrimethoxysilane were added to ethanol solvent and mixed evenly. Azobisisobutyronitrile was added under nitrogen atmosphere and the mixture was reacted at 70-85°C for 6-8 hours to obtain a polymer solution. The composite particles were ultrasonically dispersed in ethanol, and then the polymer solution was added and stirred for reaction for 10-12 hours. After the reaction was completed, the modified composite particles were filtered, washed and dried.

8. The method for producing waste textile composite board from waste clothes according to claim 7, characterized in that: In the step (2), the addition ratio of aluminum hydroxide-coated ammonium polyphosphate, hexadecyltrimethylammonium bromide, ethanol, deionized water and tetraethyl orthosilicate is 4-7 g: 1 g: 10-15 mL: 40-60 mL: 4-6 g.

9. The method of producing waste textile composite board from waste clothes according to claim 7, characterized in that: In the step (3), the mass ratio of 2-(perfluorohexyl)ethyl methacrylate, glycidyl methacrylate and 3-(methacryloyloxy)propyltrimethoxysilane is 5-7:9-12:

1.

10. A production process for producing waste textile composite board material from waste clothes according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, collecting waste clothes, crushing and mixing the waste clothes and waste polyvinyl chloride by weight, and then extruding them in an extruder, and finally cooling and crushing them to obtain pre-treated crushed materials; S2. Mix parts by weight of high-density polyethylene, modified lignin, modified composite particles, antioxidant, heat stabilizer, lubricant and pre-treated crushed materials, and melt-extrude them through an extruder to prepare a waste textile composite board.

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