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CN-122011581-A - High-strength modified polypropylene composite material and preparation process thereof

CN122011581ACN 122011581 ACN122011581 ACN 122011581ACN-122011581-A

Abstract

The invention discloses a high-strength modified polypropylene composite material and a preparation process thereof, and relates to the technical field of polypropylene composite materials. The high-strength modified polypropylene composite material comprises, by weight, 60-70 parts of polypropylene, 15-18 parts of modified glass fibers and 5-6 parts of thiazole-based phosphorus flame retardant. The invention sequentially reacts phosphorus oxychloride with p-hydroxybenzaldehyde and 2-aminothiazole to obtain a thiazolyl phosphorus-containing flame retardant, sequentially reacts glass fiber with 3-chloropropyl triethoxysilane and tetraethyl pentamine to obtain amino glass fiber, and reacts amino glass fiber, acrylate-based hindered phenol and 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate to obtain modified glass fiber. The modified glass fiber and the thiazole-based phosphorus flame retardant are added into the polypropylene to endow the polypropylene composite material with excellent flame retardance, weather resistance and mechanical properties.

Inventors

  • ZHOU JINGNAN
  • CHEN WEIPENG

Assignees

  • 深圳市星宝昌实业有限公司

Dates

Publication Date
20260512
Application Date
20260305

Claims (10)

  1. 1. The high-strength modified polypropylene composite material is characterized by comprising, by mass, 60-70 parts of polypropylene, 15-18 parts of modified glass fibers and 5-6 parts of thiazole-based phosphorus flame retardant.
  2. 2. The high-strength modified polypropylene composite material as claimed in claim 1, wherein the thiazole-based phosphorus-containing flame retardant is prepared by sequentially reacting phosphorus oxychloride with p-hydroxybenzaldehyde and 2-aminothiazole.
  3. 3. The high strength modified polypropylene composite of claim 1, wherein said modified glass fiber is prepared by reacting an aminated glass fiber, an acrylate-based hindered phenol, and 2- [3- (2H-benzotriazol-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate.
  4. 4. A high strength modified polypropylene composite material as claimed in claim 3, wherein said aminated glass fiber is prepared by reacting glass fiber with 3-chloropropyl triethoxysilane and tetraethylenepentamine in sequence.
  5. 5. A high strength modified polypropylene composite material as claimed in claim 3, wherein said acrylate-based hindered phenol is prepared by reacting 3, 5-di-t-butyl-4-hydroxybenzyl alcohol with isocyanoethyl methacrylate.
  6. 6. The preparation process of the high-strength modified polypropylene composite material is characterized by comprising the following steps of: (1) Adding the intermediate and 2-aminothiazole into 1, 6-dioxane according to the molar ratio of 1:3, stirring and reacting for 3-4 hours at 75-85 ℃, and drying to obtain a thiazolyl phosphorus-containing flame retardant; (2) Under the protection of nitrogen, 3, 5-di-tert-butyl-4-hydroxy benzyl alcohol and isocyanatoethyl methacrylate are dissolved in benzene according to a molar ratio of 1:1, stirred at room temperature for 10-20 min, dibutyl tin dilaurate is added, stirred and reacted for 5-6 h at 30-40 ℃, and reduced pressure distillation is carried out to obtain acrylate group hindered phenol; (3) Uniformly mixing (0.4-0.6) and (0.5-0.7) of amino glass fiber, acrylic ester group hindered phenol, 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methyl acrylate and N, N-dimethylformamide according to the mass ratio of 1 (0.5-0.7) to 30-40), stirring and reacting for 8-10 hours at 50-60 ℃, centrifuging, cleaning and drying to obtain modified glass fiber; (4) And adding the polypropylene, the modified glass fiber and the thiazole-based phosphorus flame retardant into a high-speed mixer, stirring and mixing for 10-20 min at 300-400 r/min, then placing the mixture into a rheometer for melt plasticization, placing the mixture into a flat vulcanizing machine for hot press molding, and naturally cooling to room temperature to obtain the high-strength modified polypropylene composite material.
  7. 7. The preparation process of the high-strength modified polypropylene composite material according to claim 6, wherein the preparation method of the intermediate in the step (1) is characterized in that phosphorus oxychloride, p-hydroxybenzaldehyde and triethylamine are weighed according to a molar ratio of 1:3:3, the p-hydroxybenzaldehyde and the triethylamine are dissolved in tetrahydrofuran, stirred at room temperature for 20-30 min, the phosphorus oxychloride is added, stirring reflux reaction is carried out for 8-10 h at a temperature of 60-66 ℃ under the protection of nitrogen, deionized water and ethyl acetate are used for extraction, an organic phase is taken, and the intermediate is prepared by drying.
  8. 8. The preparation process of the high-strength modified polypropylene composite material according to claim 6, wherein the preparation method of the aminated glass fiber in the step (3) is characterized in that the pre-modified glass fiber and N, N-dimethylformamide are uniformly mixed according to the mass ratio of 1 (40-50), tetraethylenepentamine with the mass of 2-2.4 times that of the pre-modified glass fiber is added, stirred and reacted for 3-4 hours at 50-60 ℃, centrifuged, cleaned and dried, and the aminated glass fiber is prepared.
  9. 9. The preparation process of the high-strength modified polypropylene composite material is characterized in that the preparation method of the pre-modified glass fiber is characterized in that the glass fiber, absolute ethyl alcohol and deionized water are mixed according to the mass ratio of 1 (40-50) (10-14), ultrasonic treatment is carried out for 1-2 hours, 3-chloropropyl triethoxysilane which is 1.2-1.6 times of the mass of the glass fiber is added, stirring reaction is carried out for 4-6 hours at 60-70 ℃, and the pre-modified glass fiber is obtained after centrifugation, cleaning and drying.
  10. 10. The preparation process of the high-strength modified polypropylene composite material according to claim 6, wherein the process conditions of melting and plasticizing in the step (4) are 200-210 ℃, stirring for 6-8 min at 40-100 r/min, and hot press molding is carried out for 5-6 min at 190-196 ℃ under 9-11 MPa.

Description

High-strength modified polypropylene composite material and preparation process thereof Technical Field The invention relates to the technical field of polypropylene composite materials, in particular to a high-strength modified polypropylene composite material and a preparation process thereof. Background The polypropylene composite material is a multiphase solid material which is prepared by taking polypropylene as matrix resin and compounding and mixing the polypropylene with one or more other materials. The polypropylene composite material greatly expands the performance boundary of polypropylene through modification means such as filling, reinforcing, blending and the like, so that the polypropylene composite material is upgraded from general plastic to engineering plastic meeting various harsh requirements. Glass fiber reinforced polypropylene composite materials have been studied and reported in a large number, the technology is relatively mature, and the glass fiber reinforced polypropylene composite materials are widely applied to the fields of machinery, electronic and electrical appliances, chemical industry, construction, aerospace and the like. The glass fiber reinforced polypropylene composite material has poor flame retardant effect, limiting oxygen index lower than 20%, belongs to inflammable materials, and has great potential safety hazard in practical application. Along with the gradual increase of market demands of the polypropylene composite material in the fields of building materials, automobiles, packaging, furniture and the like, the glass fiber reinforced polypropylene composite material is subjected to flame retardant research, and has great practical value for fire prevention and disaster reduction and improvement of civil material safety. On the other hand, the glass fiber reinforced polypropylene composite material is easy to age under the action of light, heat and oxygen, and especially for the composite material used outdoors for a long time, the light, heat and oxygen in the environment can aggravate the performance reduction, and the service life of the composite material is influenced. Aiming at the defects of the glass fiber reinforced polypropylene composite material, the glass fiber reinforced composite material is subjected to chemical modification, so that the weather resistance and the flame retardance of the glass fiber reinforced composite material are improved. Disclosure of Invention The invention aims to provide a high-strength modified polypropylene composite material and a preparation process thereof, so as to solve the problems in the prior art. In order to solve the technical problems, the invention provides the following technical scheme: the high-strength modified polypropylene composite material comprises, by mass, 60-70 parts of polypropylene, 15-18 parts of modified glass fibers and 5-6 parts of thiazole-based phosphorus flame retardant. Preferably, the thiazolyl phosphorus flame retardant is prepared by sequentially reacting phosphorus oxychloride with p-hydroxybenzaldehyde and 2-aminothiazole. Preferably, the modified glass fiber is prepared by reacting an aminated glass fiber, an acrylate-based hindered phenol, and 2- [3- (2H-benzotriazol-2-yl) -4-hydroxyphenyl ] ethyl 2-methacrylate. Preferably, the aminated glass fiber is prepared by sequentially reacting glass fiber with 3-chloropropyl triethoxysilane and tetraethylenepentamine. Preferably, the acrylic ester group hindered phenol is prepared by reacting 3, 5-di-tert-butyl-4-hydroxy benzyl alcohol and isocyanoethyl methacrylate. The preparation process of the high-strength modified polypropylene composite material comprises the following steps of: (1) Adding the intermediate and 2-aminothiazole into 1, 6-dioxane with the mass of 12-16 times of that of the intermediate according to the molar ratio of 1:3, stirring and reacting for 3-4 hours at 75-85 ℃, and vacuum drying for 7-8 hours at 70-80 ℃ to prepare the thiazolyl phosphorus-containing flame retardant; (2) Under the protection of nitrogen, 3, 5-di-tert-butyl-4-hydroxy benzyl alcohol and isocyanoethyl methacrylate are dissolved in benzene with the mass ratio of 5-6 times of that of 3, 5-di-tert-butyl-4-hydroxy benzyl alcohol according to the molar ratio of 1:1, stirred for 10-20 min, dibutyl tin dilaurate with the mass of 0.001-0.002 times of that of 3, 5-di-tert-butyl-4-hydroxy benzyl alcohol is added, stirred and reacted for 5-6 h at 30-40 ℃, and reduced pressure distillation is carried out to obtain acrylic ester group hindered phenol; (3) Uniformly mixing (0.4-0.6) and (0.5-0.7) of amino glass fiber, acrylic ester group hindered phenol, 2- [3- (2H-benzotriazole-2-yl) -4-hydroxyphenyl ] ethyl 2-methyl acrylate and N, N-dimethylformamide according to the mass ratio of 1 (0.5-0.7) (30-40), stirring and reacting for 8-10 hours at 50-60 ℃, centrifuging, washing with absolute ethyl alcohol and deionized water for 3 times, and vacuum drying at 80-90