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CN-118240396-B - Reinforced fiber for composite floor and preparation method thereof

CN118240396BCN 118240396 BCN118240396 BCN 118240396BCN-118240396-B

Abstract

The invention relates to the technical field of composite floors, and discloses a reinforced fiber for a composite floor and a preparation method thereof. The reinforced fiber comprises, by weight, 35-45 parts of bamboo fiber, 6-10 parts of modified polyamide fiber, 5-9 parts of polyethylene fiber, 3-6 parts of glass fiber, 8-12 parts of modified silicon dioxide and 1-2 parts of lubricant, wherein the bamboo fiber is used as a main raw material, other auxiliary fibers are added to improve the comprehensive performance of the reinforced fiber, the added modified polyamide fiber improves the flame retardant property and the heat resistance of the reinforced fiber, and the added modified silicon dioxide improves the wear resistance and the mechanical property of the reinforced fiber. Therefore, the reinforced fiber prepared by the invention can be applied to the composite floor, and can effectively improve the flame retardance, heat resistance, wear resistance and mechanical property of the composite floor.

Inventors

  • YANG LIANGQING
  • OUYANG QIANWEN
  • YU WENGE
  • She Jiajun
  • CHENG FAN

Assignees

  • 广西大自然智能家居有限公司

Dates

Publication Date
20260508
Application Date
20240424

Claims (8)

  1. 1. The reinforced fiber for the composite floor is characterized by comprising, by weight, 35-45 parts of bamboo fiber, 6-10 parts of modified polyamide fiber, 5-9 parts of polyethylene fiber, 3-6 parts of glass fiber, 8-12 parts of modified silicon dioxide and 1-2 parts of lubricant; The modified polyamide fiber is prepared by the following steps: Step A1, adding phosphorus oxychloride into a flask containing acetonitrile, heating to 60-70 ℃, adding a (4-hydroxy-phenyl) -diethyl phosphate acetonitrile solution for five times, wherein each time is separated by 20min, after the addition is finished, raising the temperature of the system to 80-90 ℃, carrying out reflux reaction for 16-22h, and after the reaction is finished, filtering and drying to obtain a phosphorus-containing flame-retardant precursor; step A2, adding 1, 11-diaminoundecane-6-ol into a mixed solution of chloroform and acetonitrile, uniformly stirring, adding trimethylchlorosilane, refluxing for 2 hours, cooling to 0 ℃, adding triethylamine and trityl chloride dissolved in chloroform into a reactor, continuously stirring for reacting for 1 hour, adding methanol, uniformly mixing, concentrating, extracting, and drying to obtain an intermediate product 1; Step A3, adding the phosphorus-containing flame-retardant precursor and acetonitrile into a flask, stirring and mixing uniformly, slowly adding an intermediate product 1 acetonitrile solution, stirring for 15min at room temperature, slowly raising the temperature of the system to 50-60 ℃, carrying out heat preservation reaction for 30min, raising the temperature to 85 ℃, continuing to react for 4-6h, cooling to room temperature after the reaction is finished, filtering, adding the mixture into an acetic acid solution, refluxing for 10min, and then filtering, washing and drying again to obtain an amino-terminated flame-retardant product; Step A4, adding the sebacic acid, the dodecadiamine and the amine-terminated flame-retardant product into a reactor containing deionized water, stirring and mixing uniformly, regulating the pH value to 7.3-7.5, transferring the mixed solution into a high-temperature high-pressure reaction kettle, introducing nitrogen, opening the reaction kettle, heating to 210-230 ℃, stirring and reacting for 2-3h, after the reaction is finished, raising the temperature of the reaction kettle to 260 ℃, continuing to react for 0.5-1.5h under a vacuum condition, recovering the normal pressure state, discharging, placing the discharged material into cooling water, cooling to room temperature, drying, and crushing to obtain the modified polyamide fiber; The modified silicon dioxide is prepared by the following steps: Step B1, adding silicon dioxide into a mixed solution of ethanol and deionized water, stirring and mixing uniformly, adding gamma-aminopropyl triethoxysilane, stirring and reacting for 5-8 hours, centrifuging, washing and drying after the reaction is finished to obtain the amino silicon dioxide; And B2, adding diethanolamine and succinic anhydride into a flask, adding aminated silicon dioxide, stirring for 30min by ultrasonic, raising the temperature of the system to 70-80 ℃, keeping the temperature and stirring for 1-2h, raising the temperature of the system to 110-120 ℃ again, adding toluene, reacting for 6h under the condition of nitrogen, then cooling to 60-70 ℃, slowly dropwise adding epichlorohydrin acetone solution and boron trifluoride diethyl ether, carrying out reflux reaction for 2-3h, carrying out reduced pressure distillation, adding 25wt% sodium hydroxide solution, heating to 75-85 ℃ and reacting for 3h, and filtering, carrying out reduced pressure distillation, centrifuging and drying after the reaction is finished to obtain the modified silicon dioxide.
  2. 2. The reinforced fiber for composite floor according to claim 1, wherein the ratio of phosphorus oxychloride, acetonitrile and (4-hydroxy-phenyl) -diethyl phosphate acetonitrile solution in step A1 is 10.2-30.6g:50ml:250ml, and the (4-hydroxy-phenyl) -diethyl phosphate acetonitrile solution is prepared by mixing (4-hydroxy-phenyl) -diethyl phosphate and acetonitrile in a ratio of 25.2-75.5g:250 ml.
  3. 3. The reinforced fiber for composite flooring according to claim 1, wherein the 1, 11-diaminoundecan-6-ol, chloroform, acetonitrile, trimethylchlorosilane, chloroform, triethylamine, trityl chloride and methanol are used in the amount ratio of 0.01mol:15-20ml:3-4ml:0.01mol 10ml:0.02-0.03mol:0.01-0.025mol:2ml in step A2.
  4. 4. The reinforced fiber for composite floor according to claim 1, wherein in the step A3, the phosphorus-containing flame retardant precursor, acetonitrile, the intermediate product 1 acetonitrile solution and the acetic acid solution are mixed in a dosage ratio of 14.1-42.3g:100mL:200mL:100mL, the intermediate product 1 acetonitrile solution is formed by mixing the intermediate product 1 and acetonitrile in a dosage ratio of 24.2-72.6g:200mL, and the mass ratio of acetic acid to deionized water in the acetic acid solution is 1:1.
  5. 5. The reinforced fiber for composite flooring according to claim 1, wherein the amount ratio of the sebacic acid, the dodecanediamine, the amine terminated flame retardant product, and the deionized water in the step A4 is 20-40g:22-42g:1.26-5.74g:40-60mL.
  6. 6. The reinforcing fiber for composite floor according to claim 1, wherein the amount ratio of silica, ethanol, deionized water and γ -aminopropyl triethoxysilane in step B1 is 1g:30ml:5ml:1-2mL.
  7. 7. The reinforcing fiber for a composite floor according to claim 1, wherein in the step B2, diethanolamine, succinic anhydride, aminated silica, toluene, epichlorohydrin acetone solution, boron trifluoride diethyl ether and sodium hydroxide solution are used in a ratio of 1.5 to 3g to 1.57 to 3.14g to 0.8 to 1.5g to 20ml to 0.8 to 1.2g to 15ml, and epichlorohydrin acetone solution is prepared by mixing epichlorohydrin and acetone in a ratio of 1:1.
  8. 8. The method for producing a reinforcing fiber for a composite floor panel according to claim 1, comprising the steps of: S1, weighing raw materials according to parts by weight, crushing bamboo fibers into powder, uniformly mixing the powder with modified polyamide fibers, polyethylene fibers, glass fibers, modified silicon dioxide and a lubricant, and stirring for 30-50min at 100-120 ℃ to obtain a premix; and S2, putting the premix into an extrusion granulator, extruding and granulating at 170-210 ℃ and crushing to obtain the reinforced fiber for the composite floor.

Description

Reinforced fiber for composite floor and preparation method thereof Technical Field The invention relates to the technical field of composite floors, in particular to a reinforced fiber for a composite floor and a preparation method thereof. Background Floor, which is an indispensable decorative material in building construction, is made of wood or other materials. The composite floor is one of floors, and the natural structure of the floor material is artificially changed to achieve the floor with certain physical properties meeting the expected requirements, and the floors are roughly classified into natural landscape, wind, water and water floors, solid wood floors, reinforced composite wood floors, solid wood composite floors, PVC floors, bamboo and wood floors, cork floors, wood-plastic floors and the like. The floor board which is commonly used at present is a wood-plastic composite floor board, which is prepared by mixing polyolefin, wood powder, bamboo powder and an auxiliary agent, granulating and then extruding and molding by an extruder. However, the existing wood-plastic composite floor is generally produced by using plant fibers, polyolefin and auxiliary agents, so that the floor has the defects of poor wear resistance, brittleness, flammability and the like, and the application of the floor in some fields is limited. The reinforced fiber is a material for improving the comprehensive performance of the composite floor material, is generally prepared from plant fibers, other fibers (such as polyethylene fibers, polyamide fibers, glass fibers and the like), fillers and additives, and aims at the problem of inflammability of the composite floor, the flame retardant performance of the reinforced fiber can be improved by modifying the polyamide fibers and introducing a flame retardant structure into molecular chains of the polyamide fibers, and the wear-resistant fillers such as silicon dioxide, calcium carbonate and the like can be added and modified to ensure that the wear-resistant fillers have better dispersibility in a matrix of the composite reinforced fiber, so that the wear resistance and the heat resistance of the reinforced fiber are further improved, and in addition, the mechanical performance of the reinforced fiber can be improved by preparing the fillers with a core-shell structure aiming at the problem of fragility of the composite floor. Therefore, the comprehensive performance of the composite floor can be improved by applying the reinforced fiber with flame retardance, wear resistance and excellent mechanical properties to the composite floor. Disclosure of Invention In order to solve the technical problems, the invention provides a reinforced fiber for a composite floor and a preparation method thereof. The aim of the invention can be achieved by the following technical scheme: The reinforced fiber for the composite floor comprises, by weight, 35-45 parts of bamboo fiber, 6-10 parts of modified polyamide fiber, 5-9 parts of polyethylene fiber, 3-6 parts of glass fiber, 8-12 parts of modified silicon dioxide and 1-2 parts of lubricant; The modified polyamide fiber is prepared by the following steps: Step A1, adding phosphorus oxychloride into a flask containing acetonitrile, heating to 60-70 ℃, adding a (4-hydroxy-phenyl) -diethyl phosphate acetonitrile solution for five times, wherein each time is separated by 20min, after the addition is finished, raising the temperature of the system to 80-90 ℃, carrying out reflux reaction for 16-22h, and after the reaction is finished, filtering and drying to obtain a phosphorus-containing flame-retardant precursor; Further, the dosage ratio of phosphorus oxychloride, acetonitrile and (4-hydroxy-phenyl) -diethyl phosphate acetonitrile solution is 10.2-30.6g:50mL:250mL, and the (4-hydroxy-phenyl) -diethyl phosphate acetonitrile solution is prepared by mixing (4-hydroxy-phenyl) -diethyl phosphate and acetonitrile according to the dosage ratio of 25.2-75.5g:250 mL. Step A2, adding 1, 11-diaminoundecane-6-ol into a mixed solution of chloroform and acetonitrile, uniformly stirring, adding trimethylchlorosilane, refluxing for 2 hours, cooling to 0 ℃, adding triethylamine and trityl chloride dissolved in chloroform into a reactor, continuously stirring for reacting for 1 hour, adding methanol, uniformly mixing, concentrating, extracting, and drying to obtain an intermediate product 1; Further, the dosage ratio of 1, 11-diaminoundecan-6-ol, chloroform, acetonitrile, trimethylchlorosilane, chloroform, triethylamine, trityl chloride and methanol is 0.01mol:15-20mL:3-4mL:0.01mol:10mL:0.02-0.03mol:0.01-0.025mol:2mL. Step A3, adding the phosphorus-containing flame-retardant precursor and acetonitrile into a flask, stirring and mixing uniformly, slowly adding an intermediate product 1 acetonitrile solution, stirring for 15min at room temperature, slowly raising the temperature of the system to 50-60 ℃, carrying out heat preservation reaction for 30min, rais