CN112457583B

CN112457583B - Wear-resistant and aging-resistant furniture plastic particles and preparation method thereof

Info

Publication number: CN112457583B
Application number: CN202011344625.1A
Authority: CN
Inventors: 胡森川; 杨曦; 罗万象; 陈志益
Original assignee: ZHEJIANG SENCHUAN FURNITURE CO Ltd
Current assignee: ZHEJIANG SENCHUAN FURNITURE Co.,Ltd.
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-09-17
Anticipated expiration: 2040-11-25
Also published as: CN112457583A; WO2022110593A1

Abstract

The invention belongs to the technical field of plastic functionalization, and particularly discloses wear-resistant and aging-resistant furniture plastic particles and a preparation method thereof. The nano inorganic powder, the inorganic fiber and the plant fiber are dispersed in the liquid paraffin in advance and added into the second feeding port where the polypropylene is completely melted, so that the dispersibility is improved, and the wear resistance of the plastic is improved. By utilizing the good aging resistance and the extension characteristic of POE, the POE is pre-compounded with the antioxidant and the ultraviolet absorbent to form the compound anti-aging agent, when the POE is used for mixing polypropylene, the elasticity and the extensibility of the POE enable the antioxidant and the ultraviolet absorbent to be uniformly dispersed with the polypropylene in a mixed material to form protection, and compared with the method that the antioxidant and the ultraviolet absorbent are directly added into the polypropylene to disperse, the POE has a better dispersion effect. According to the invention, through the improvement of reasonable combination, pretreatment and addition modes of raw materials, the obtained plastic particles have good wear resistance and aging resistance when being used for furniture, and can be directly used for preparing furniture through injection molding or extruded into plates for preparing furniture.

Description

Wear-resistant and aging-resistant furniture plastic particles and preparation method thereof

Technical Field

The invention belongs to the technical field of plastic functionalization, relates to plastic for furniture, and further relates to wear-resistant and aging-resistant furniture plastic particles and a preparation method thereof.

Background

Traditionally, furniture is mainly made of wood, and with the development of the architectural decoration industry, the demand for wood is rapidly developed. The wood has long growth period, so that the wood is difficult to meet huge household requirements, and various artificial boards, laminated wood and the like are used for furniture instead of the original wood. However, the environmental and health problems are also raised.

Plastics are used as bulk raw materials of current production, living and industrial products, not only relate to the field extensively, but also are of a great variety, especially with the continuous improvement of polymer plastics functionality, it has played a huge role in replacing metal, timber. The use of plastics for furniture production has therefore developed rapidly. Compared with traditional solid wood furniture, rattan furniture, iron art furniture and the like, the plastic furniture is furniture with new performance, and is popular with consumers due to bright color, various shapes, portability, compactness, wide application range and convenient maintenance.

The plastic has the advantages of light weight, stable chemical property, no corrosion, good impact resistance, better transparency, good insulating property, good coloring property, lower processing cost and the like, can be well molded when being used for manufacturing furniture, thereby reducing the use of a large amount of adhesives for wooden furniture and having outstanding contribution to environmental protection. Compared with furniture made of wood or metal materials, the plastic furniture has extremely strong plasticity, can be processed into any shape, has rich colors, is skillfully matched with other furniture, and can beautify rooms.

With the development of technology, the current plastic furniture is changed from the original simple plastic table and chair to the furniture such as plastic cabinet and plastic bed. The engineering plastic has excellent comprehensive performance, high rigidity, small creep, high mechanical strength, high heat resistance and high electric insulating property, and may be used in harsh physical environment for long period to replace wood with plastic. However, the engineering plastics have high cost and difficult large-piece processability. Therefore, the use of common plastics for furniture is currently the choice of many furniture manufacturers.

However, there are still many problems in the direct preparation of furniture by using common general plastics such as Polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and Polystyrene (PS), which are mainly shown in the following: 1. the strength problem, plastics are high molecular materials, and the strength is lower than that of cellulosic wood, so that the plastics can be applied to furniture by reasonably improving the strength; 2. the wear resistance is high, and the high polymer plastic is flexible, poor in wear resistance and easy to scrape; there is a need to improve the wear resistance and rigidity; 3. the aging resistance problem is solved, the high molecular weight plastic has the characteristic of high molecular weight, the material can be slowly degraded, aged and faded along with the illumination and the like, and the mechanical strength is continuously reduced, so the aging problem needs to be solved for prolonging the service life.

The Chinese invention patent CN107523007A discloses a wear-resistant plastic composite board with excellent performance, belonging to the technical field of plastic products. The paint is prepared from the following components in parts by weight: 40-60 parts of polyformaldehyde plastic, 20-30 parts of acrylonitrile-butadiene-styrene copolymer, 15-30 parts of polymethacrylate, 5-10 parts of polylactic acid, 1-5 parts of antioxidant, 5-8 parts of wear-resisting agent, 10-18 parts of filler, 1-5 parts of anti-aging agent, 1-3 parts of lubricant, 2-5 parts of corrosion-resistant resin and 5-8 parts of silicon carbide crystal particles. The plastic plate prepared by the invention has the advantages of excellent wear resistance, high mechanical strength, strong corrosion resistance, high temperature resistance, improved oxidation resistance and weather resistance, greatly prolonged service life and wide market space.

Chinese invention patent CN111019311A discloses a wear-resistant engineering plastic and a preparation method thereof, which is composed of the following materials in parts by weight: 65-75 parts of unsaturated polyester, 60-80 parts of polyethylene glycol terephthalate, 3-5 parts of semi-aromatic nylon PA6T 15-35 parts, 10-12 parts of polytetrafluoroethylene, 10-20 parts of potassium titanate whisker reinforcement, 3-5 parts of butyltin mercaptide stabilizer, 1-5 parts of additive, 0.6-1.8 parts of coupling agent, 0.2-0.5 part of antioxidant and 0.7-2.5 parts of lubricant, wherein the lubricant is one or a plurality of compositions of liquid paraffin, polyethylene wax and glyceryl monostearate.

In order to obtain plastic with good wear resistance, the prior art mainly adopts engineering plastic and expensive materials for wear resistance modification, and although the wear resistance is improved, the cost is high, and the plastic can only be applied to products with high added values. For bulk furniture products, manufacturers still use common polymers such as polypropylene, which are relatively low in cost and easy to process.

Disclosure of Invention

In order to realize that furniture prepared by common plastic polypropylene has good wear resistance and aging resistance, the invention develops a plastic particle with wear resistance and aging resistance, and the plastic particle can be directly used for various injection molding, sheet extrusion and other processing and used for plastic furniture.

Firstly, the invention provides a preparation method of wear-resistant and aging-resistant furniture plastic particles, which is characterized by comprising the following steps: the preparation method comprises the following steps:

(1) grinding and dispersing nano inorganic powder and silicone powder, then mixing with paraffin in a weight ratio of 1:5-8, heating until the paraffin is completely melted, and stirring at a high speed to form a nano particle pre-dispersion liquid;

(2) adding inorganic fiber and plant fiber powder into the nano particle pre-dispersion liquid, further stirring and dispersing uniformly, cooling and then crushing into fine particles, and storing the fine particles serving as a prepared material in a storage bin A;

(3) mixing POE, an antioxidant and an ultraviolet absorbent, adding the mixture into a single-screw extruder, extruding and granulating to obtain a composite anti-aging agent, and then feeding the composite anti-aging agent into a bin B; wherein, the POE, the antioxidant and the ultraviolet absorbent are as follows by weight: 80-90 parts of POE, 3-5 parts of antioxidant and 2-5 parts of ultraviolet absorbent;

(4) adding polypropylene, a compatilizer, a coupling agent, a filler and toner into a high-speed mixer, uniformly stirring at a high speed of 100-120 ℃, and conveying into a bin C through a pipeline; wherein the polypropylene, the compatilizer, the coupling agent, the filler and the toner are weighed according to the parts by weight: 70-80 parts of polypropylene, 1-2 parts of compatilizer, 0.1-0.2 part of coupling agent, 3-5 parts of filler and 0-1 part of toner;

(5) the materials in the bin B and the bin C are automatically weighed and mixed according to the mass ratio of 1:8-10, and then are fed into a first feeding port of a screw extruder through an automatic hoisting machine; adding the material in the bin A into a second feeding port of the screw extruder; the temperature of the screw extruder was set as: the first section is 160-180 ℃, the second section is 190-200 ℃, the third section is 210-220 ℃, the fourth section is 225-230 ℃ and the fifth section is 160-180 ℃; the first feed inlet is arranged at the first section, the second feed inlet is arranged between the third section and the fourth section, and the distance between the first feed inlet and the second feed inlet is controlled to be 65-85 cm; extruding by a screw extruder, air-cooling, granulating, vibrating, screening and packaging to obtain the wear-resistant and aging-resistant furniture plastic particles.

The nano inorganic powder has a certain reinforcing effect when being used for high molecular plastics, and simultaneously can increase the wear resistance of the plastics, however, if the nano inorganic powder cannot be effectively dispersed, the interface reinforcing effect and the wear resistance effect of the nano inorganic powder in the plastics can be limited. How to effectively and uniformly disperse the nano inorganic powder in the plastic is a great problem which puzzles technical personnel. Since the plastic processing process is in a thermoplastic viscoelastic state, it is obvious that the nano inorganic powder is difficult to disperse directly in the plastic. The inorganic nano-powder is ground and dispersed with silicone, and then the inorganic nano-powder and paraffin are mixed in a weight ratio of 1:5-8 to form a liquid state, and the liquid state is stirred at a high speed, so that the inorganic nano-powder can be dispersed.

Preferably, the mass ratio of the nano inorganic powder to the silicone in the step (1) is 100: 0.5-1; the silicone powder is ground and dispersed, so that large agglomerated particles of the nano inorganic powder are depolymerized and dispersed, and the nano inorganic powder has lipophilicity and is easy to disperse in molten paraffin; furthermore, the silicone powder is advantageous for improving the abrasion resistance and scratch resistance. After the nano inorganic powder and the silicone are ground and dispersed, the nano inorganic powder and the paraffin are used in a weight ratio of 1:5-8, and a large amount of paraffin is used to form a liquid state, and the nano inorganic powder and the paraffin are stirred at a high speed in the liquid state, so that the nano inorganic powder is favorably dispersed.

Preferably, the inorganic nano-powder in the step (1) is one or a combination of more of nano calcium carbonate, nano precipitated barium sulfate, nano mica powder, nano montmorillonite, nano talcum powder, nano diatomite and nano kaolin.

Further, the grinding dispersion in the step (1) can achieve the effect by adopting mature ball milling and jet milling.

Further, the paraffin is heated to be completely melted in the step (1), the adopted temperature is based on the melting of the paraffin, the temperature is not easy to be too high, and the paraffin is volatilized and degenerated due to too high temperature; when the paraffin wax is used specifically, the paraffin wax is heated in an oil bath constant temperature stirring kettle at 70 ℃.

Further, the high-speed stirring in the step (1) is carried out at a stirring speed of 800-.

Preferably, the adding amount of the inorganic fiber in the step (2) is 15-20% of the mass of the nano particle pre-dispersion liquid; the addition amount of the plant fiber powder is 15-20% of the mass of the nano particle pre-dispersion liquid. The inorganic fiber and the plant fiber powder can not only increase the impact strength of the plastic, but also increase the wear resistance of the plastic, and prevent the prepared plastic furniture from scratching; similarly, inorganic fibers and plant fiber powders are difficult to be directly dispersed in viscoelastic plastics, and the invention is to disperse inorganic fibers and plant fiber powders in advance in a liquid nanoparticle predispersion liquid in order to make them easily dispersed in viscoelastic plastics during screw extrusion.

Further, the inorganic fiber in the step (2) is preferably at least one of glass fiber, aluminum silicate fiber, wollastonite fiber, brucite fiber, sepiolite fiber, calcium carbonate whisker and calcium sulfate whisker.

Further, the plant fiber powder in the step (2) is one of corn straw, wheat straw and flax straw which are screened by a 50-mesh screen. Furthermore, a large number of experiments show that the effect of adding the flax straw powder on improving the wear resistance of the plastic is more obvious. The addition of the plant fiber powder enables furniture prepared from the obtained plastic particles to have certain wood texture.

Preferably, in the step (3), the POE, the antioxidant and the ultraviolet absorbent are granulated to prepare the composite anti-aging agent in advance, the POE has good aging resistance, and the composite anti-aging agent is formed by the POE, the antioxidant and the ultraviolet absorbent in advance, so that the POE has good elasticity and ductility when being mixed with the polypropylene, and the antioxidant and the ultraviolet absorbent are protected with the polypropylene at intervals in the mixed material to promote the anti-aging effect.

Further, the antioxidant in the step (3) is selected from one of 1010, DLTP and BHT; the ultraviolet absorbent is UV-531.

Further, the polypropylene in the step (4) is selected from at least one of EPF30R, EPR30R and EPS 30R; the compatilizer is polypropylene grafted maleic anhydride; the coupling agent is selected from one of titanate coupling agent and aluminate coupling agent; the filler is one of glass beads and serpentine powder; the processing flowability of the plastic can be assisted on one hand, and the wear resistance and the gloss of the plastic can be assisted to be improved on the other hand; the toner is selected according to specific color requirements, and can be a pigment or a commercially available color master batch; the invention recommends selecting titanium dioxide in white, selecting mica titanium pearlescent pigment in pearlescent color, iron red, iron orange, iron yellow, zinc iron yellow and the like, and does not recommend using pigments containing heavy metals such as chrome green, chrome yellow, medium chrome yellow, molybdenum chrome red, cadmium yellow, cadmium orange, cadmium red and the like.

Preferably, the material added at the second feeding port in the step (5) accounts for 15-20% of the mass of the material added at the first feeding port. Materials in the bin B and the bin C are added into the first charging opening for melt mixing, and the materials melt-mixed at the second charging opening are mixed with pre-dispersed prepared materials, so that the prepared materials are easy to melt and disperse and are rapidly dispersed in the molten mixed materials. If the materials in the bin A, B, C are mixed at the same time and then added into the first feeding port, the viscosity is too high initially due to a certain melting range of polypropylene mixing and melting, so that the A prepared material is difficult to disperse, hard lumps are easy to form, and the dispersion is difficult in subsequent shearing. Therefore, the invention firstly adds the materials in the bin B, C into the first feed opening for melting and mixing, and adds the pre-dispersing material A into the second feed opening which is completely melted, thereby promoting the good dispersion of the pre-dispersing material A. Further preferably, the distance between the first feeding opening and the second feeding opening is controlled to be 80 cm.

Preferably, the screw extruder in the step (5) is a co-rotating twin-screw extruder, the co-rotating twin-screw extruder has a good shearing and dispersing effect, and the nano inorganic substance is favorably dispersed. Further preferably, the control rotation speed of the screw extruder is 150-200rpm, and air-cooled die face granulation is adopted for granulation.

In addition, the invention provides the wear-resistant and aging-resistant furniture plastic particles prepared by the method. The polypropylene is taken as the mainstream plastic for furniture at present, has low cost and is easy to be processed into large furniture or furniture plates by the processes of injection molding, extrusion and the like, but compared with engineering plastics, the polypropylene has the advantages of lower rigidity and lower strength when being used for the furniture, and the prepared furniture is not wear-resistant, is easy to scratch and has obvious aging phenomenon. Therefore, the polypropylene is comprehensively modified aiming at the requirements of plastic furniture, and the wear resistance and the aging resistance of the polypropylene are improved for the standard national standard 'general technical conditions for plastic furniture' (GB/T3487-2016).

The invention is through grinding and dispersing nanometer inorganic powder and silicone in advance, disperse in the molten paraffin to form the liquid state, make nanometer inorganic powder obtain dispersion through the liquid dispersion; meanwhile, inorganic fibers and plant fibers which are difficult to disperse are pre-dispersed in liquid paraffin, so that the problem that the inorganic fibers and the plant fibers are difficult to disperse in viscoelastic plastic directly is solved, and the wear resistance and the strength of the plastic are improved by fully dispersing the nano inorganic powder, the inorganic fibers and the plant fibers. By utilizing the good aging resistance of POE, the POE is pre-compounded with the antioxidant and the ultraviolet absorbent to form the compound aging-resistant agent, and the elasticity and the ductility of POE are better when the POE is mixed with polypropylene, so that the antioxidant and the ultraviolet absorbent are uniformly dispersed with the polypropylene in the mixed material to form protection, and the aging-resistant effect is promoted. The materials in the bin B, C are added into the first feed opening for melting and mixing, and the pre-dispersing material A is added into the second feed opening which is completely melted, so that the good dispersion of the pre-dispersing material A is promoted.

The beneficial effects are that:

1. in order to improve the wear resistance of the polypropylene, the liquid paraffin with the nano inorganic powder, the inorganic fiber and the plant fiber dispersed in advance is added into the second feeding port with the polypropylene completely melted, so that the dispersibility is improved, and the wear resistance of the plastic is improved.

2. According to the invention, by utilizing the good aging resistance and the extension characteristic of POE, the antioxidant and the ultraviolet absorbent form the composite anti-aging agent in advance, and when the POE is used for mixing polypropylene, the elasticity and the extensibility of the POE enable the antioxidant and the ultraviolet absorbent to be uniformly dispersed with the polypropylene in a mixed material to form protection, and compared with the dispersion effect of directly adding the antioxidant and the ultraviolet absorbent into the polypropylene, the POE has a better dispersion effect.

3. According to the invention, through the improvement of the reasonable selection, pretreatment and addition modes of the raw materials, the obtained plastic particles have good impact resistance, wear resistance and aging resistance when being used for furniture, and can be directly used for preparing furniture through injection molding or extruded into plates for preparing furniture.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention will be clearly and completely described below with reference to the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without any inventive step based on the technical idea of the present invention shall fall within the scope of protection of the present invention.

Example 1

(1) Adding nano calcium carbonate and silicone powder into a ball mill according to the mass ratio of 100:1 for ball milling for 15min, and enabling the nano calcium carbonate to be hydrophobic and dispersed by the silicone powder; then mixing the nano particles with 58# paraffin wax in a weight ratio of 1:5-8, heating the mixture in an oil bath constant-temperature stirring kettle at 70 ℃ until the paraffin wax is completely melted, and stirring the mixture at a high speed of 1000rpm for 20min to form a nano particle pre-dispersion liquid;

(2) adding glass fiber and flax straw powder passing through a 50-mesh screen into the nano particle pre-dispersion liquid, and further stirring and uniformly dispersing, wherein the adding amount of the glass fiber is 20% of the mass of the nano particle pre-dispersion liquid; the adding amount of the flax straw powder is 20% of the mass of the nano particle pre-dispersion liquid, and the flax straw powder is cooled and crushed into fine particles to be stored in a storage bin A as a prepared material;

(3) mixing 80 parts by weight of POE, 3 parts by weight of antioxidant 1010 and 2 parts by weight of ultraviolet absorbent UV-531, adding the mixture into a single-screw extruder, extruding and granulating at 120 ℃ to obtain a composite anti-aging agent, and then feeding the composite anti-aging agent into a bin B;

(4) adding 70 parts by weight of polypropylene EPF30R, 2 parts by weight of compatilizer polypropylene grafted maleic anhydride, 0.2 part by weight of aluminate coupling agent, titanate, 3 parts by weight of glass bead filler and 0.3 part by weight of mica titanium pearlescent pigment into a high-speed mixer, uniformly stirring at a high speed of 100 ℃, and conveying into a storage bin C through a pipeline;

(5) the materials in the bin B and the bin C are automatically weighed and mixed according to the mass ratio of 1:8, and then are fed into a first feeding port of a co-rotating double-screw extruder by an automatic elevator; adding the material in the bin A into a second feeding port of the screw extruder; the material that the second charge door added is that the temperature of the 20% screw extruder of first charge door add material quality sets up: the first section is 160 ℃, the second section is 190 ℃, the third section is 210 ℃, the fourth section is 225 ℃ and the fifth section is 180 ℃; the first feed inlet is arranged at the first section, the second feed inlet is arranged between the third section and the fourth section, and the distance between the first feed inlet and the second feed inlet is controlled to be 80 cm; controlling the rotating speed of the screw to be 150 rpm; extruding by a co-rotating double-screw extruder, pelletizing on an air-cooling die surface, vibrating and screening, and packaging to obtain the wear-resistant and aging-resistant furniture plastic particles.

Comparative example 1

(1) Adding nano calcium carbonate and silicone powder into a ball mill according to the mass ratio of 100:1 for ball milling for 15min, and enabling the nano calcium carbonate to be hydrophobic and dispersed by the silicone powder; then mixing the nano particles with 58# paraffin wax in a weight ratio of 1:0.5, heating the mixture in an oil bath constant-temperature stirring kettle at 70 ℃ until the paraffin wax is completely melted, and stirring the mixture at a high speed of 1000rpm for 20min to form a nano particle dispersing material;

(2) adding glass fiber and flax straw powder passing through a 50-mesh screen into the nanoparticle dispersing material, and further uniformly stirring and dispersing, wherein the adding amount of the glass fiber is 20% of the mass of the nanoparticle dispersing material; the adding amount of the flax straw powder is 20 percent of the mass of the nano particle pre-dispersing material, and the flax straw powder is cooled and crushed into fine particles to be stored in a storage bin A as a prepared material;

(5) the materials in the bin B and the bin C are automatically weighed and mixed according to the mass ratio of 1:8, and then are fed into a first feeding port of a co-rotating double-screw extruder by an automatic elevator; adding the material in the bin A into a second feeding port of the screw extruder; the mass of the materials added from the second feed opening is 20 percent of the mass of the materials added from the first feed opening; the temperature of the screw extruder was set as: the first section is 160 ℃, the second section is 190 ℃, the third section is 210 ℃, the fourth section is 225 ℃ and the fifth section is 180 ℃; the first feed inlet is arranged at the first section, the second feed inlet is arranged between the third section and the fourth section, and the distance between the first feed inlet and the second feed inlet is controlled to be 80 cm; controlling the rotating speed of the screw to be 150 rpm; extruding by a co-rotating double-screw extruder, pelletizing on an air-cooling die surface, vibrating and screening, and packaging to obtain the wear-resistant and aging-resistant furniture plastic particles.

Example 2

(1) Adding the nano precipitated barium sulfate and silicone powder into a ball mill according to the mass ratio of 100:0.5 for ball milling for 15min, and enabling the nano precipitated barium sulfate to be hydrophobic and dispersed by the silicone powder; then mixing the nano particles with 58# paraffin wax in a weight ratio of 1:6, heating the mixture in an oil bath constant-temperature stirring kettle at 70 ℃ until the paraffin wax is completely melted, and stirring the mixture at a high speed of 800rpm for 25min to form a nano particle pre-dispersion liquid;

(2) adding glass fiber and flax straw powder passing through a 50-mesh screen into the nano particle pre-dispersion liquid, and further uniformly stirring and dispersing, wherein the adding amount of the glass fiber is 15% of the mass of the nano particle pre-dispersion liquid; the adding amount of the flax straw powder is 20% of the mass of the nano particle pre-dispersion liquid, and the flax straw powder is cooled and crushed into fine particles to be stored in a storage bin A as a prepared material;

(3) mixing 80 parts by weight of POE, 4 parts by weight of antioxidant DLTP and 2 parts by weight of ultraviolet absorbent UV-531, adding the mixture into a single-screw extruder, extruding and granulating at 120 ℃ to obtain a composite anti-aging agent, and then feeding the composite anti-aging agent into a storage bin B;

(4) adding 70 parts by weight of polypropylene EPR30R, 2 parts by weight of compatilizer polypropylene grafted maleic anhydride, 0.2 part by weight of coupling agent aluminate, 3 parts by weight of serpentine powder filler and 0.2 part by weight of zinc iron yellow pigment into a high-speed mixer, uniformly stirring at a high speed of 120 ℃, and conveying into a storage bin C through a pipeline;

(5) the materials of the bin B and the bin C are automatically weighed and mixed according to the mass ratio of 1:10, and then are fed into a first feeding port of a co-rotating double-screw extruder through an automatic elevator; adding the material in the bin A into a second feeding port of the screw extruder; the mass of the materials added from the second feed opening is 18 percent of the mass of the materials added from the first feed opening; the temperature of the screw extruder was set as: the first section is 160 ℃, the second section is 200 ℃, the third section is 210 ℃, the fourth section is 225 ℃ and the fifth section is 180 ℃; the first feed inlet is arranged at the first section, the second feed inlet is arranged between the third section and the fourth section, and the distance between the first feed inlet and the second feed inlet is controlled to be 80 cm; controlling the rotating speed to be 150 rpm; extruding by a co-rotating double-screw extruder, pelletizing on an air-cooling die surface, vibrating and screening, and packaging to obtain the wear-resistant and aging-resistant furniture plastic particles.

Comparative example 2

(1) Mixing nano precipitated barium sulfate and No. 58 paraffin wax in a weight ratio of 1:6, heating in an oil bath constant-temperature stirring kettle at 70 ℃ until the paraffin wax is completely melted, and stirring at a high speed of 800rpm for 25min to form a nano particle pre-dispersion liquid;

Example 3

(1) Adding the nano talcum powder and the silicone powder into a ball mill according to the mass ratio of 100:1 for ball milling for 15min, and enabling the nano talcum powder to be hydrophobic and dispersed by the silicone powder; then mixing the nano particles with 58# paraffin wax according to the weight ratio of 1:8, heating the mixture in an oil bath constant-temperature stirring kettle at 70 ℃ until the paraffin wax is completely melted, and stirring the mixture at a high speed of 1000rpm for 20min to form a nano particle pre-dispersion liquid;

(2) adding sepiolite fibers and corn straw powder passing through a 50-mesh screen into the nanoparticle pre-dispersion liquid, and further stirring and dispersing uniformly, wherein the adding amount of the sepiolite fibers is 15% of the mass of the nanoparticle pre-dispersion liquid; the adding amount of the corn straw powder is 20% of the mass of the nano particle pre-dispersion liquid, and the corn straw powder is cooled and crushed into fine particles to be stored in a storage bin A as a prepared material;

(3) mixing 85 parts by weight of POE, 5 parts by weight of antioxidant BHT and 2 parts by weight of ultraviolet absorbent UV-531, adding the mixture into a single-screw extruder, extruding and granulating at 120 ℃ to obtain a composite anti-aging agent, and then feeding the composite anti-aging agent into a bin B;

(4) adding 75 parts by weight of polypropylene EPS30R, 2 parts by weight of compatilizer polypropylene grafted maleic anhydride, 0.2 part by weight of coupling agent titanate, 3 parts by weight of glass bead filler and 0.2 part by weight of iron orange into a high-speed mixer, uniformly stirring at a high speed of 100 ℃, and conveying into a storage bin C through a pipeline;

(5) the materials in the bin B and the bin C are automatically weighed and mixed according to the mass ratio of 1:8, and then are fed into a first feeding port of a co-rotating double-screw extruder by an automatic elevator; adding the material in the bin A into a second feeding port of the screw extruder; the mass of the materials added by the second feed inlet is 16 percent of the mass of the materials added by the first feed inlet; the temperature of the screw extruder was set as: the first section is 180 ℃, the second section is 200 ℃, the third section is 210 ℃, the fourth section is 225 ℃ and the fifth section is 170 ℃; the first feed inlet is arranged at the first section, the second feed inlet is arranged between the third section and the fourth section, and the distance between the first feed inlet and the second feed inlet is controlled to be 80 cm; controlling the rotating speed to be 200 rpm; extruding by a co-rotating double-screw extruder, pelletizing on an air-cooling die surface, vibrating and screening, and packaging to obtain the wear-resistant and aging-resistant furniture plastic particles.

Comparative example 3

(3) mixing 85 parts by weight of POE, 5 parts by weight of antioxidant BHT and 2 parts by weight of ultraviolet absorbent UV-531 to obtain a composite anti-aging agent, and then feeding the anti-aging agent into a storage bin B;

Example 4

(2) adding glass fiber and flax straw powder passing through a 50-mesh screen into the nano particle pre-dispersion liquid, and further uniformly stirring and dispersing, wherein the adding amount of the glass fiber is 15% of the mass of the nano particle pre-dispersion liquid; the adding amount of the flax straw powder is 15% of the mass of the nano particle pre-dispersion liquid, and the flax straw powder is cooled and crushed into fine particles to be stored in a storage bin A as a prepared material;

(4) adding 75 parts by weight of polypropylene EPS30R, 2 parts by weight of compatilizer polypropylene grafted maleic anhydride, 0.2 part by weight of coupling agent titanate, 3 parts by weight of glass bead filler and 0.4 part by weight of iron oxide red into a high-speed mixer, uniformly stirring at a high speed of 100 ℃, and conveying into a storage bin C through a pipeline;

(5) the materials in the bin B and the bin C are automatically weighed and mixed according to the mass ratio of 1:8, and then are fed into a first feeding port of a co-rotating double-screw extruder by an automatic elevator; adding the material in the bin A into a second feeding port of the screw extruder; the mass of the materials added from the second feed opening is 20 percent of the mass of the materials added from the first feed opening; the temperature of the screw extruder was set as: the first section is 180 ℃, the second section is 200 ℃, the third section is 210 ℃, the fourth section is 225 ℃ and the fifth section is 170 ℃; the first feed inlet is arranged at the first section, the second feed inlet is arranged between the third section and the fourth section, and the distance between the first feed inlet and the second feed inlet is controlled to be 80 cm; controlling the rotating speed to be 200 rpm; extruding by a co-rotating double-screw extruder, pelletizing on an air-cooling die surface, vibrating and screening, and packaging to obtain the wear-resistant and aging-resistant furniture plastic particles.

Comparative example 4

(5) the materials of the bin B and the bin C are automatically weighed and mixed according to the mass ratio of 1:8, and are added into the bin A for uniform mixing, wherein the adding amount of the materials of the bin A is 20% of the total mass of the materials of the bin B and the materials of the bin C; then the mixture is fed into a first charging hole of a screw extruder for one-time addition, and the temperature of the screw extruder is set as follows: the first section is 180 ℃, the second section is 200 ℃, the third section is 210 ℃, the fourth section is 225 ℃ and the fifth section is 170 ℃; controlling the rotating speed to be 200 rpm; extruding by a co-rotating double-screw extruder, pelletizing on an air-cooling die surface, vibrating and screening, and packaging to obtain the wear-resistant and aging-resistant furniture plastic particles.

Aging resistance test:

the plastic pellets obtained in examples 1 to 4 and comparative examples 1 to 4 were injection-molded into a sheet having a thickness of 4mm, and then cut into a sample having a width of 10mm and a length of 80mm to conduct a test of impact strength according to GB/T1043.1-2008 (part 1 of the measurement of impact properties of plastic simple beams); further, the obtained sheet with the thickness of 4mm was subjected to xenon lamp light exposure and aging treatment, referring to GB/T16422.2-2014 (plastic laboratory light source exposure test method), in order to simulate sunlight, the xenon arc lamp was filtered using a filter, exposure cycle was performed according to method a cycle number 1, the impact strength was measured after irradiation for 500 hours, and the aging resistance was evaluated by the change of the impact strength before and after irradiation. The impact strengths before and after irradiating the sample with the xenon arc lamp are shown in table 1.

And (3) evaluating the wear resistance:

the plastic particles obtained in examples 1-4 and comparative examples 1-4 were injection molded into a sheet with a smooth surface and a thickness of 4mm, and the abrasion resistance and scratch resistance of the sheet were measured by using pencils with different hardness to scratch the surface of the plastic sheet from 3B with reference to GB/T6739-2006 (determination of paint film hardness by the colored paint and varnish pencil method), and gradually increasing the hardness of the pencils until scratches were scratched. As shown in table 1.

Table 1:

through tests, the plastic particles obtained by the invention have excellent aging resistance, the retention of the impact strength after 500 hours of xenon lamp illumination is more than 85%, the slight retention rate exceeding GB/T3487-2016 (general technical conditions for plastic furniture) is more than 60%, and the furniture production requirements are met. According to an applicable principle, pencils with different hardness are used for scratch test, and the product prepared from the plastic disclosed by the invention is high in hardness, scratch-resistant and good in wear resistance.

Comparative example 1 reduces the amount of paraffin wax used when dispersing nano inorganic powder, and since the nano inorganic powder is not dispersed in a liquid state due to the reduction of the amount of paraffin wax, the dispersion thereof is affected, which is shown in the present invention that nano particles cannot establish effective interfacial wear resistance, and at the same time, the nano reinforcing function thereof is greatly reduced.

Comparative example 2 the nano-precipitated barium sulfate treated without adding silicone powder has a certain influence on the dispersibility of barium sulfate and the compatibility with polypropylene, and the silicone powder has scratch resistance when used in plastics, thus having a certain influence on the abrasion resistance of polypropylene.

In comparative example 3, POE, antioxidant BHT and ultraviolet absorbent UV-531 were not melted, kneaded and dispersed by a screw, but were directly mixed as powders for use, so that the uniformity of kneading the antioxidant and ultraviolet absorbent with polypropylene was deteriorated, which affects the absorption of ultraviolet absorbent into ultraviolet light and the aging resistance.

Comparative example 4 no addition of material a at the second feed port, i.e. no addition in the completely molten state of the polypropylene, was initially too viscous to allow dispersion of the a precursor, prone to hard lumps formation and difficult to disperse in subsequent shearing. The dispersion of nano inorganic powder, inorganic fiber and plant fiber is poor, and the polypropylene wear resistance and the enhancement are affected.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.

Claims

1. A preparation method of wear-resistant and aging-resistant furniture plastic particles is characterized by comprising the following steps: the preparation method comprises the following steps:

2. The preparation method of the wear-resistant and aging-resistant furniture plastic particles as claimed in claim 1, wherein the preparation method comprises the following steps: the mass ratio of the nano inorganic powder to the silicone in the step (1) is 100: 0.5-1.

3. The preparation method of the wear-resistant and aging-resistant furniture plastic particles as claimed in claim 1, wherein the preparation method comprises the following steps: in the step (1), the nano inorganic powder is one or a combination of more of nano calcium carbonate, nano precipitated barium sulfate, nano mica powder, nano montmorillonite, nano talcum powder, nano diatomite and nano kaolin.

4. The preparation method of the wear-resistant and aging-resistant furniture plastic particles as claimed in claim 1, wherein the preparation method comprises the following steps: the high-speed stirring in the step (1) is carried out for 20-30min by adopting a stirring speed of 800-1000 rpm.

5. The preparation method of the wear-resistant and aging-resistant furniture plastic particles as claimed in claim 1, wherein the preparation method comprises the following steps: in the step (2), the addition amount of the inorganic fiber is 15-20% of the mass of the nano particle pre-dispersion liquid; the adding amount of the plant fiber powder is 15-20% of the mass of the nano particle pre-dispersion liquid; wherein, the inorganic fiber is preferably at least one of glass fiber, aluminum silicate fiber, wollastonite fiber, brucite fiber, sepiolite fiber, calcium carbonate whisker and calcium sulfate whisker; the plant fiber powder is one of corn straw, wheat straw and flax straw which pass through a 50-mesh screen.

6. The preparation method of the wear-resistant and aging-resistant furniture plastic particles as claimed in claim 1, wherein the preparation method comprises the following steps: in the step (3), the antioxidant is selected from one of 1010, DLTP and BHT; the ultraviolet absorbent is UV-531.

7. The preparation method of the wear-resistant and aging-resistant furniture plastic particles as claimed in claim 1, wherein the preparation method comprises the following steps: in the step (4), the polypropylene is selected from at least one of EPF30R, EPR30R and EPS 30R; the compatilizer is polypropylene grafted maleic anhydride; the coupling agent is selected from one of titanate coupling agent and aluminate coupling agent; the filler is one of glass beads and serpentine powder.

8. The preparation method of the wear-resistant and aging-resistant furniture plastic particles as claimed in claim 1, wherein the preparation method comprises the following steps: in the step (5), the material added from the second feeding port accounts for 15-20% of the mass of the material added from the first feeding port.

9. The preparation method of the wear-resistant and aging-resistant furniture plastic particles as claimed in claim 1, wherein the preparation method comprises the following steps: in the step (5), the screw extruder is a co-rotating twin-screw extruder, and the control rotating speed of the screw extruder is 150-200 rpm.

10. A wear-resistant and ageing-resistant furniture plastic pellet, characterized by being produced by the method of any one of claims 1 to 9.