WO2022110593A1

WO2022110593A1 - Wear-resistant and aging-resistant furniture plastic particle and preparation method therefor

Info

Publication number: WO2022110593A1
Application number: PCT/CN2021/083284
Authority: WO
Inventors: 胡森川; 杨曦; 罗万象; 陈志益
Original assignee: 胡森川
Priority date: 2020-11-25
Filing date: 2021-03-26
Publication date: 2022-06-02
Also published as: CN112457583A; CN112457583B

Abstract

The present invention belongs to the technical field of plastic functionalization. Specifically disclosed are a wear-resistant and aging-resistant furniture plastic particle and a preparation method therefor. A nano inorganic powder, inorganic fibers and plant fibers are pre-dispersed into a liquid paraffin, and added to a second feeding port where polypropylene is completely melted, so as to increase the dispersibility and improve the wear resistance of the plastics. The good aging resistance and ductility of POE is utilized by pre-mixing same with an antioxidant and an ultraviolet absorber to form a composite anti-aging agent, and when used in polypropylene mixing, the elasticity and ductility of POE allow the antioxidant and the ultraviolet absorber to be uniformly dispersed with polypropylene in a mixed material to form protection, which has a better dispersion effect when compared with directly adding an antioxidant and an ultraviolet absorber into polypropylene for dispersion. According to the present invention, by means of the reasonable combination of raw materials, pretreatment and the improvement of a feeding method, the plastic particles obtained are used for furniture with a good wear resistance and aging resistance, and can be used for manufacturing furniture directly by injection molding or by extrusion to form sheets.

Description

A kind of wear-resistant and anti-aging furniture plastic particles and preparation method

technical field

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

Background technique

Traditionally, furniture is mainly made of wood, but with the development of the building decoration industry, the demand for wood is developing rapidly. Due to the long growth cycle of wood, it is difficult to meet the huge household demand. Various wood-based panels and glulam are used for furniture instead of native wood. However, environmental health problems also arise.

As a bulk raw material for current production, living and industrial supplies, plastics not only involve a wide range of fields, but also have a wide variety of types. Especially with the continuous improvement of the functionality of polymer plastics, it has played a huge role in replacing metal and wood. Therefore, the use of plastics for furniture production has been rapidly developed. Compared with traditional solid wood furniture, rattan furniture, wrought iron furniture, etc., plastic furniture is a new type of furniture. It is popular with consumers because of its bright colors, different shapes, lightness and compactness, wide application and easy maintenance.

Plastic has the advantages of light weight, stable chemical properties, no rust, good impact resistance, good transparency, good insulation, good colorability and low processing costs, and can be well shaped for making furniture. , thereby reducing the use of a large amount of adhesives for wooden furniture, and has outstanding contributions to environmental protection. Compared with furniture made of wood or metal materials, plastic furniture is extremely malleable and can be processed into any shape. At the same time, it is rich in color and can be cleverly matched with other furniture to beautify the room.

With the development of technology, the current plastic furniture has changed from simple plastic tables and chairs to plastic cabinets, plastic beds and other furniture. Engineering plastics have excellent comprehensive properties, high rigidity, low creep, high mechanical strength, good heat resistance, and good electrical insulation. They can be used for a long time in harsh physical environments to achieve the purpose of replacing wood with plastics. However, the cost of engineering plastics is high, and the processability of large parts is difficult. Therefore, the use of ordinary plastics in furniture is the choice of many furniture manufacturers.

However, ordinary general-purpose plastics polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS) still have many problems in the direct preparation of furniture, mainly in: 1. Strength problems, Plastic is a polymer material, and its strength is lower than that of fibrous wood, so it needs a reasonable improvement in strength before plastic can be used in furniture; 2. The problem of wear resistance, polymer plastics are flexible and have poor wear resistance. , easy to scratch; need to improve its wear resistance and rigidity; 3. Anti-aging problem, polymer plastics are of high molecular weight, the material will slowly degrade, age and fade with the light and so on, and its mechanical strength will continue to decrease, so in order to prolong the The service life needs to solve the aging problem.

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

Chinese invention patent CN111019311A discloses a wear-resistant engineering plastic and its preparation method, which is composed of the following materials in parts by weight: 65-75 parts of unsaturated polyester, 60-80 parts of polyethylene terephthalate, semi-aromatic 15-35 parts of family nylon PA6T, 10-12 parts of polytetrafluoroethylene, 10-20 parts of potassium titanate whisker reinforcement, 3-5 parts of butyl tin mercaptide stabilizer, 1-5 parts of additives, 0.6-1.8 parts of coupling agent parts, 0.2-0.5 parts of antioxidants and 0.7-2.5 parts of lubricants, wherein the lubricants are one or more compositions of liquid paraffin, polyethylene wax and glycerol monostearate, the invention relates to engineering plastics product technology In the field of wear-resistant engineering plastics and the preparation method thereof, the raw materials and ingredients are reasonable, and the engineering plastics produced have obvious and durable wear-resistant effects, excellent mechanical properties, and better effects when used in conjunction with polytetrafluoroethylene coatings. , After making engineering parts, its own loss is small, and the performance changes are small in complex working environment.

In order to obtain plastics with good wear resistance in the prior art, engineering plastics are mainly used, and more expensive materials are used for wear resistance modification. Although the wear resistance is improved, the cost is high and can only be applied to products with high added value. For bulk furniture products, manufacturers still use common polymers such as polypropylene, which are cheaper and easier to process.

SUMMARY OF THE INVENTION

In order to realize the good wear resistance and aging resistance of furniture made of ordinary plastic polypropylene, the present invention aims to develop a plastic particle with wear resistance and aging resistance, which can be directly used in various injection molding, Processing of extruded sheets, etc., for plastic furniture.

First, the present invention provides a method for preparing wear-resistant and aging-resistant furniture plastic particles, characterized in that: the specific preparation method is as follows:

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

(2) adding inorganic fiber and plant fiber powder to the nanoparticle pre-dispersion liquid to further stir and disperse evenly, pulverize into fine particles after cooling, and store in silo A as a preparatory material;

(3) mixing POE, antioxidant and ultraviolet absorber into single-screw extruder for extrusion and granulation to obtain composite anti-aging agent, which is then fed into silo B; wherein, POE, antioxidant and ultraviolet absorber are as per The parts by weight are: 80-90 parts by weight of POE, 3-5 parts by weight of antioxidant, and 2-5 parts by weight of ultraviolet absorber.

(4) Add polypropylene, compatibilizer, coupling agent, filler, and toner into a high-speed mixer, stir evenly at a high speed at 100-120°C, and send it to silo C through a pipeline; among them, polypropylene, compatibilizer , Coupling agent, filler and toner are weighed according to parts by weight: 70-80 parts by weight of polypropylene, 1-2 parts by weight of compatibilizer, 0.1-0.2 parts by weight of coupling agent, 3-5 parts by weight of filler, toner 0-1 parts by weight.

(5) The materials in the silo B and the silo C are automatically weighed and mixed at a mass ratio of 1:8-10, and then sent to the first feeding of the screw extruder through the automatic elevator; the material in the silo A is added to the screw The second feeding port of the extruder; the temperature of the screw extruder is set to: 160-180°C for the first stage, 190-200°C for the second stage, 210-220°C for the third stage, 230-225°C for the fourth stage, The fifth section is 160-180°C; the first feeding port is set in the first section, the second feeding port is set between the third section and the fourth section, and the distance between the first feeding port and the second feeding port is controlled at 65-85cm; Extruded through a screw extruder, air-cooled and diced, vibrated and screened, and packaged to obtain a wear-resistant and aging-resistant furniture plastic granule.

Nano inorganic powder has a certain strengthening effect when used in polymer plastics, and nano inorganic powder will also increase the wear resistance of plastics. However, if it cannot be effectively dispersed, the interface enhancement effect and resistance of nano inorganic powder in plastics Grinding effect will be limited. How to effectively and uniformly disperse nano-inorganic powders in plastics is a major problem for technicians. Since the processing of plastics is in a thermoplastic viscoelastic state, it is obviously difficult to directly disperse nano-inorganic powders in them. In the liquid state, the dispersion effect of the nano-inorganic powder is good. Therefore, in the present invention, after grinding and dispersing the nano-inorganic powder and the silicone, the nano-inorganic powder and the paraffin are formed in a weight ratio of 1:5-8 to form a liquid state. High-speed stirring is conducive to the dispersion of nano-inorganic powders.

Preferably, in step (1), the mass ratio of the nano inorganic powder and the silicone is 100:0.5-1; by grinding and dispersing the silicone powder, on the one hand, the large particles agglomerated by the nano inorganic powder are depolymerized and dispersed, On the other hand, nano-inorganic powder has lipophilicity and is easy to disperse in molten paraffin; in addition, silicone powder is beneficial to improve wear resistance and scratch resistance. After the nano-inorganic powder and silicone are ground and dispersed, and paraffin wax is used in a weight ratio of 1:5-8, more paraffin is used to form a liquid, and high-speed stirring in the liquid state is conducive to the dispersion of nano-inorganic powder.

Preferably, the nano inorganic powder described in step (1) selects one or more of nano calcium carbonate, nano precipitated barium sulfate, nano mica powder, nano montmorillonite, nano talc, nano diatomite, nano kaolin combination of species.

Further, the grinding and dispersing described in step (1) can be achieved by using mature ball milling and jet milling.

Further, heating described in the step (1) until the paraffin is completely melted, the temperature adopted makes the paraffin melting as the criterion, and the temperature is not easy to be too high, and the excessively high temperature can cause the paraffin to volatilize and deteriorate; In the specific use, such as selecting 58 #Paraffin wax can be heated in a constant temperature stirring tank in an oil bath at 70°C.

Further, for the high-speed stirring described in step (1), a stirring speed of 800-1000 rpm is used for stirring for 20-30 min.

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

Further, the inorganic fibers described in step (2) are preferably at least one of glass fibers, aluminum silicate fibers, wollastonite fibers, brucite fibers, sepiolite fibers, calcium carbonate whiskers, and calcium sulfate whiskers. kind.

Further, the plant fiber powder described in step (2) is one of corn stalks, wheat stalks, and flax stalks that have passed through a 50-mesh screen. Further, we found through a large number of experiments that the addition of flax straw powder has a more significant effect on improving the wear resistance of plastics. The addition of the plant fiber powder makes the furniture prepared from the obtained plastic particles have a certain woody feel.

Preferably, in step (3), POE, antioxidant and ultraviolet absorber are granulated to prepare composite anti-aging agent in advance, POE has good anti-aging properties, and composite anti-aging agent is formed by pre-forming with antioxidant and ultraviolet absorber When mixed with polypropylene, POE has better elasticity and ductility, so that antioxidants and ultraviolet absorbers can form protection between polypropylene and polypropylene in the mixture, and promote the anti-aging effect.

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

Further, the grade of polypropylene selected in step (4) is at least one of EPF30R, EPR30R and EPS30R; the compatibilizer is polypropylene grafted maleic anhydride; the coupling agent is titanate coupling A kind of agent and aluminate coupling agent; the filler is selected from one of glass microbeads and serpentine powder; on the one hand, it can assist the processing fluidity of plastics, and on the other hand, it can assist in improving the wear resistance of plastics The color powder is selected according to the specific color needs, and it can be a pigment or a commercially available color masterbatch; the present invention recommends choosing titanium dioxide for white color, mica titanium pearlescent pigment, iron red and iron orange for pearlescent color. , iron yellow, zinc iron yellow, etc., pigments containing heavy metals such as chrome green, chrome yellow, medium chrome yellow, molybdenum chrome red, cadmium yellow, cadmium orange, cadmium red, etc. are not recommended.

Preferably, the material added to the second feeding port in step (5) is 15-20% of the mass of the material added to the first feeding port. By adding the materials in silo B and silo C into the first feeding port for melting and kneading, the material melted and kneaded in the second feeding port is mixed with the pre-dispersed pre-mixed material, the pre-prepared material is easy to melt and disperse, and quickly disperse in the molten in the mix. If the materials in silo A, B, and C are mixed at the same time and then added at the first feeding port, since polypropylene has a certain melting range in mixing and melting, the initial viscosity is too large, it is difficult to disperse the prepared material A, and it is easy to form a hard lump. , it is difficult to disperse in subsequent shearing. To this end, the present invention firstly adds the materials in the B and C silos to melt kneading at the first feeding port, and adds the pre-dispersed material A to the completely melted second feeding port, thereby promoting the good dispersion of the pre-dispersed material A. Further preferably, the distance between the first feeding port and the second feeding port is controlled at 80 cm.

As a preference, the screw extruder in step (5) is a co-rotating twin-screw extruder, and the co-rotating twin-screw extruder has a better shear dispersion effect, and as a preference, it is beneficial to the dispersion of nano-inorganic substances. Further preferably, the rotational speed of the screw extruder is controlled to be 150-200 rpm, and the pelletizing adopts an air-cooled die face for pelletizing.

In addition, the present invention provides a kind of wear-resistant and anti-aging furniture plastic particles prepared by the above method. As the mainstream plastic currently used in furniture, polypropylene has low cost and is easy to be processed into large pieces of furniture or furniture panels by injection molding, extrusion and other processes. However, compared with engineering plastics, polypropylene has lower rigidity when used in furniture. , The strength is low, the prepared furniture is not wear-resistant, easy to be scratched, and the aging phenomenon is obvious. Therefore, the present invention comprehensively modifies polypropylene for the needs of plastic furniture, and improves the abrasion resistance and aging resistance of polypropylene in accordance with the national standard "General Technical Conditions for Plastic Furniture" (GB/T3487-2016).

In the present invention, nano inorganic powder and silicone are ground and dispersed in advance, dispersed in molten paraffin to form a liquid state, and nano inorganic powder is dispersed by liquid dispersion; meanwhile, inorganic fibers and plant fibers that are difficult to disperse are pre-dispersed in liquid paraffin wax. In this way, it overcomes the problem that it is not easy to disperse directly in viscoelastic plastics, so that the wear resistance and strength of plastics can be improved by fully dispersing nano-inorganic powders, inorganic fibers and plant fibers. The use of POE has good aging resistance. By forming a composite anti-aging agent with antioxidants and ultraviolet absorbers in advance, POE has better elasticity and ductility when it is mixed with polypropylene, so that antioxidants and ultraviolet absorbers can be absorbed. The agent is evenly dispersed with polypropylene in the mixture to form protection and promote the anti-aging effect. By adding the materials in the B and C silos to the first feeding port for melting and kneading, and adding the pre-dispersed material A to the second completely melted feeding port, the good dispersion of the pre-dispersed material A is promoted.

Beneficial effects:

1. In order to improve the wear resistance of polypropylene, the present invention makes the pre-dispersed liquid paraffin of nano inorganic powder, inorganic fiber and plant fiber, and adds it in the second feeding port where polypropylene is completely melted to increase the dispersibility and improve the Abrasion resistance of plastics.

2. The present invention utilizes the good aging resistance and ductility of POE, and forms a composite anti-aging agent with antioxidants and ultraviolet absorbers in advance. When used in polypropylene mixing, the elasticity and ductility of POE make the antioxidants , The UV absorber is uniformly dispersed with polypropylene in the mixing material to form protection, and the dispersion effect is better than that of directly adding antioxidant and UV absorber to polypropylene dispersion.

3. Through the reasonable selection of raw materials, the improvement of pretreatment, and the improvement of adding methods, the obtained plastic particles not only have good impact resistance, but also wear resistance and aging resistance when used in furniture, and can directly prepare furniture by injection molding or extrusion. Preparation of furniture into panels.

Detailed ways

In order to make those skilled in the art better understand the solution of the present invention, the technical solution of the present invention will be described clearly and completely below with reference to the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and Not all examples. Based on the technical idea of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Example 1

(1) adding nano calcium carbonate and silicone powder into a ball mill for 15min with a mass ratio of 100: 1, the silicone powder makes the nano calcium carbonate hydrophobic and dispersed; ℃ oil bath constant temperature stirring tank heated until the paraffin is completely melted, and stirred at a high speed of 1000rpm for 20min to form a nanoparticle pre-dispersion;

(2) Add glass fiber and flax straw powder that has passed through a 50-mesh sieve into the nanoparticle pre-dispersion solution to further stir and disperse evenly. The amount of glass fiber added is 20% of the mass of the nanoparticle pre-dispersion solution; the amount of flax straw powder is nano 20% of the mass of the particle pre-dispersion is crushed into fine particles after cooling, and stored in the silo A as a preparatory material;

(3) 80 parts by weight of POE, 3 parts by weight of antioxidant 1010, and 2 parts by weight of ultraviolet absorber UV-531 are mixed and added into a single screw extruder to extrude and granulate at 120° C. to obtain a composite anti-aging agent, which is then fed into Silo B;

(4) 70 parts by weight of polypropylene EPF30R, 2 parts by weight of compatibilizer polypropylene grafted maleic anhydride, 0.2 parts by weight of aluminate coupling agent, titanate, 3 parts by weight of glass bead filler, 0.3 parts by weight Mica-titanium pearlescent pigments are added to a high-speed mixer, stirred at a high speed at 100°C, and then sent to silo C through a pipeline;

(5) The materials in the silo B and the silo C are automatically weighed and mixed at a mass ratio of 1:8, and then sent to the first feeding of the co-rotating twin-screw extruder through the automatic elevator; the material in the silo A is added The second feeding port of the screw extruder; the material added to the second feeding port is 20% of the mass of the material added to the first feeding port. The third stage is 210 °C, the fourth stage is 225 °C, and the fifth stage is 180 °C; the first feeding port is set in the first section, the second feeding port is set between the third and fourth sections, and the first feeding port is connected to the second feeding port. The distance of the mouth is controlled at 80cm; the speed of the screw is controlled at 150rpm; it is extruded through a co-rotating twin-screw extruder, diced on an air-cooled die surface, vibrated, sieved, and packaged to obtain a wear-resistant and aging-resistant furniture plastic granule.

Comparative Example 1

(1) adding nano calcium carbonate and silicone powder in a mass ratio of 100: 1 into a ball mill for ball milling for 15min, and the silicone powder hydrophobicizes and disperses the nano calcium carbonate; Heating in the oil bath constant temperature stirring tank until the paraffin is completely melted, and stirring at a high speed of 1000rpm for 20min to form a nanoparticle dispersion;

(2) Add glass fiber and flax straw powder that has passed through a 50-mesh sieve into the nanoparticle dispersion material to further stir and disperse evenly. The amount of glass fiber added is 20% of the mass of the nanoparticle pre-dispersed material; the amount of flax straw powder added is nanoparticle 20% of the mass of the pre-dispersed material, crushed into fine particles after cooling, and stored in the silo A as a preparatory material;

(5) The materials in the silo B and the silo C are automatically weighed and mixed at a mass ratio of 1:8, and then sent to the first feeding of the co-rotating twin-screw extruder through the automatic elevator; the material in the silo A is added The second feeding port of the screw extruder; the material added to the second feeding port is 20% of the mass of the material added to the first feeding port; the temperature of the screw extruder is set as: the first section 160 ° C, the second section 190 ° C, The third section is 210 °C, the fourth section is 225 °C, and the fifth section is 180 °C; the first feeding port is located in the first section, the second feeding port is set between the third and fourth sections, and the first feeding port is The distance of the feeding port is controlled at 80cm; the screw speed is controlled at 150rpm; extruded through a co-rotating twin-screw extruder, air-cooled die face granulation, vibrating screening, and packaging to obtain a wear-resistant and aging-resistant furniture plastic granule.

Example 2

(1) adding nano-precipitated barium sulfate and silicone powder into ball mill for 15min with mass ratio of 100: 0.5, and silicone powder making nano-precipitated barium sulfate hydrophobic and dispersed; ℃ oil bath constant temperature stirring tank heated until the paraffin is completely melted, and stirred at a high speed of 800rpm for 25min to form a nanoparticle pre-dispersion;

(2) Add glass fiber and flax straw powder that has passed through a 50-mesh sieve into the nanoparticle pre-dispersion solution to further stir and disperse evenly. The amount of glass fiber added is 15% of the mass of the nanoparticle pre-dispersion solution; the amount of flax straw powder is nano 20% of the mass of the particle pre-dispersion is crushed into fine particles after cooling, and stored in the silo A as a preparatory material;

(3) Mix 80 parts by weight of POE, 4 parts by weight of antioxidant DLTP, and 2 parts by weight of ultraviolet absorber UV-531 into a single-screw extruder to extrude and granulate at 120° C. to obtain a composite anti-aging agent, which is then fed into Silo B;

(4) 70 parts by weight of polypropylene EPR30R, 2 parts by weight of compatibilizer polypropylene grafted maleic anhydride, 0.2 parts by weight of coupling agent aluminate, 3 parts by weight of serpentine powder filler, 0.2 parts by weight of zinc iron yellow pigment , add the high-speed mixer, stir evenly at a high speed at 120 °C, and send it into the silo C through the pipeline;

(5) The materials in the silo B and the silo C are automatically weighed and mixed at a mass ratio of 1:10, and then sent to the first feeding of the co-rotating twin-screw extruder through the automatic elevator; the material in the silo A is added The second feeding port of the screw extruder; the material added to the second feeding port is 18% of the mass of the material added to the first feeding port; the temperature of the screw extruder is set to: 160 ° C for the first section, 200 ° C for the second section, The third section is 210 °C, the fourth section is 225 °C, and the fifth section is 180 °C; the first feeding port is located in the first section, the second feeding port is set between the third and fourth sections, and the first feeding port is The distance of the feeding port is controlled at 80cm; the rotation speed is controlled at 150rpm; extruded through a co-rotating twin-screw extruder, air-cooled die surface dicing, vibrating screening, and packaging to obtain a wear-resistant and aging-resistant furniture plastic granule.

Comparative Example 2

(1) mixing nano-precipitated barium sulfate and 58# paraffin with a weight ratio of 1: 6, heating to the paraffin wax in the oil bath constant temperature stirring vessel of 70°C, and stirring at a high speed of 800rpm for 25min, forming a nanoparticle pre-mixture Dispersions;

Example 3

(1) adding nano-talc and silicone powder in a mass ratio of 100: 1 to a ball mill for ball milling for 15 minutes, and the silicone powder hydrophobizes and disperses the nano-talc powder; then mix with 58# paraffin in a weight ratio of 1: 8, at a temperature of 70° C. Heating in the oil bath constant temperature stirring tank until the paraffin is completely melted, and stirring at a high speed of 1000rpm for 20min to form a nanoparticle pre-dispersion;

(2) adding the sepiolite fibers and the corn stalk powder that has passed through the 50-mesh sieve into the nano-particle pre-dispersion solution to further stir and disperse evenly, and the amount of the sepiolite fibers added is 15% of the mass of the nano-particle pre-dispersion solution; the corn stalk powder The added amount is 20% of the mass of the nanoparticle pre-dispersion, and after cooling, it is pulverized into fine particles and stored in the silo A as a preparatory material;

(3) 85 parts by weight of POE, 5 parts by weight of antioxidant BHT, and 2 parts by weight of ultraviolet absorber UV-531 were mixed and added to a single screw extruder to extrude and granulate at 120° C. to obtain a composite anti-aging agent, and then sent into Silo B;

(4) 75 parts by weight of polypropylene EPS30R, 2 parts by weight of compatibilizer polypropylene grafted maleic anhydride, 0.2 parts by weight of coupling agent titanate, 3 parts by weight of glass bead fillers, 0.2 parts by weight of iron orange were added High-speed mixer, stir evenly at high speed at 100 °C, and send it into the silo C through the pipeline;

(5) The materials in the silo B and the silo C are automatically weighed and mixed at a mass ratio of 1:8, and then sent to the first feeding of the co-rotating twin-screw extruder through the automatic elevator; the material in the silo A is added The second feeding port of the screw extruder; the material added to the second feeding port is 16% of the mass of the material added to the first feeding port; the temperature of the screw extruder is set to: 180 ° C for the first section, 200 ° C for the second section, The third section is 210 °C, the fourth section is 225 °C, and the fifth section is 170 °C; the first feeding port is set in the first section, the second feeding port is set between the third and fourth sections, and the first feeding port is The distance of the feeding port is controlled at 80cm; the rotation speed is controlled at 200rpm; extruded through a co-rotating twin-screw extruder, granulated on the air-cooled die surface, vibrated sieve, and packaged to obtain a wear-resistant and aging-resistant furniture plastic granule.

Comparative Example 3

(3) 85 parts by weight of POE, 5 parts by weight of antioxidant BHT, 2 parts by weight of ultraviolet absorber UV-531 are mixed to obtain a composite anti-aging agent, which is then fed into silo B;

Example 4

(2) Add glass fiber and flax straw powder that has passed through a 50-mesh sieve into the nanoparticle pre-dispersion solution to further stir and disperse evenly. The amount of glass fiber added is 15% of the mass of the nanoparticle pre-dispersion solution; the amount of flax straw powder is nano 15% of the mass of the particle pre-dispersion liquid, crushed into fine particles after cooling, and stored in the silo A as a preparatory material;

(4) 75 parts by weight of polypropylene EPS30R, 2 parts by weight of compatibilizer polypropylene grafted maleic anhydride, 0.2 parts by weight of coupling agent titanate, 3 parts by weight of glass microbead fillers, 0.4 parts by weight of iron red, added High-speed mixer, stir evenly at high speed at 100 °C, and send it into the silo C through the pipeline;

(5) The materials in the silo B and the silo C are automatically weighed and mixed at a mass ratio of 1:8, and then sent to the first feeding of the co-rotating twin-screw extruder through the automatic elevator; the material in the silo A is added The second feeding port of the screw extruder; the material added to the second feeding port is 20% of the mass of the material added to the first feeding port; the temperature of the screw extruder is set to: 180 ° C for the first section, 200 ° C for the second section, The third section is 210 °C, the fourth section is 225 °C, and the fifth section is 170 °C; the first feeding port is set in the first section, the second feeding port is set between the third and fourth sections, and the first feeding port is The distance of the feeding port is controlled at 80cm; the rotation speed is controlled at 200rpm; extruded through a co-rotating twin-screw extruder, granulated on the air-cooled die surface, vibrated sieve, and packaged to obtain a wear-resistant and aging-resistant furniture plastic granule.

Comparative Example 4

(5) Mix the materials in silo B and silo C at a mass ratio of 1:8 by automatic weighing, add the preparatory materials in silo A and mix them evenly, and the amount of material added in silo A is the sum of the mass of material in silo B and material C. Then the mixture is fed into the first feeding port of the screw extruder and added at one time, and the temperature of the screw extruder is set to: 180 °C for the first section, 200 °C for the second section, 210 °C for the third section, and 210 °C for the third section. The fourth stage is 225 °C, the fifth stage is 170 °C; the control speed is 200rpm; extruded through a co-rotating twin-screw extruder, air-cooled die surface granulation, vibrating screening, and packaging to obtain a wear-resistant and aging-resistant furniture plastic granules .

Aging resistance test:

The plastic granules obtained in Examples 1-4 and Comparative Examples 1-4 were injection-molded into plates with a thickness of 4 mm, and then cut into samples with a width of 10 mm and a length of 80 mm for impact strength testing. According to GB/T1043.1-2008 (Determination of Impact Properties of Plastic Simply Supported Beams Part 1) to test; further, the obtained sheet with a thickness of 4 mm is subjected to xenon light exposure for 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 by a filter, and the exposure cycle was carried out according to the method A, cycle number 1, and the impact strength was tested after irradiating for 500 h, and the aging resistance was evaluated by the change of the impact strength before and after illumination. The impact strength of the samples before and after the xenon arc lamp irradiation is shown in Table 1.

Wear resistance evaluation:

The plastic particles obtained by Example 1-4 and Comparative Example 1-4 are injection-molded into a plate with a smooth surface thickness of 4 mm, with reference to GB/T 6739-2006 (paint and varnish pencil method is used to measure paint film hardness), using different hardnesses The pencil starts to scratch the surface of the plastic plate from 3B, and gradually increases the hardness of the pencil until scratches are made, so as to measure the wear resistance and scratch resistance of the plate. As shown in Table 1.

Table 1:

Through the test, the plastic particles obtained by the present invention have excellent aging resistance, and the impact strength retention after 500h of xenon lamp illumination is greater than 85%, exceeding the mild retention rate specified in GB/T3487-2016 (general technical conditions for plastic furniture) greater than 60% , to meet the needs of furniture production. According to the applicable principle, the scratch test is carried out by using pencils with different hardness, and the product prepared from the plastic of the present invention has high hardness, scratch resistance and good wear resistance.

Comparative example 1 reduces the amount of paraffin when dispersing the nano-inorganic powder. Due to the reduction in the amount of paraffin, the nano-inorganic powder is not dispersed in a liquid state, and its dispersion is affected. In the present invention, it is manifested that the nanoparticles fail to establish an effective interface. Wear resistance, while its nano-enhancing function is also greatly reduced.

Comparative example 2 does not add silicone powder to treat nano-precipitated barium sulfate, which has a certain influence on the dispersibility of barium sulfate and the compatibility with polypropylene, and silicone powder is used in plastics because it has scratch resistance, so it is not suitable for polypropylene. wear resistance has a certain impact.

In Comparative Example 3, POE, antioxidant BHT, and ultraviolet absorber UV-531 were not melt-mixed and dispersed with a screw, but were directly mixed with powder for use, so that the antioxidant and ultraviolet absorber were mixed with polypropylene uniformly. Deterioration, affecting the absorption of ultraviolet light by the ultraviolet absorber and affecting the aging resistance.

In Comparative Example 4, material A was not added at the second feeding port, that is, it was not added when polypropylene was completely melted. Initially, the viscosity was too large, making it difficult to disperse the A prepared material, and it was easy to form a hard lump, which was difficult to disperse in the subsequent shearing. . The impact is that the dispersion of nano-inorganic powder, inorganic fiber and plant fiber is poor, and it is affected in improving the abrasion resistance and reinforcement of polypropylene.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention.

It should be understood that although this specification is described in terms of embodiments, not every embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole, and each The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

A preparation method for wear-resistant and aging-resistant furniture plastic particles, characterized in that: the specific preparation method is as follows:

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

(2) adding inorganic fiber and plant fiber powder to the nanoparticle pre-dispersion liquid to further stir and disperse evenly, pulverize into fine particles after cooling, and store in silo A as a preparatory material;

(3) mixing POE, antioxidant and ultraviolet absorber into single-screw extruder for extrusion and granulation to obtain composite anti-aging agent, which is then fed into silo B; wherein, POE, antioxidant and ultraviolet absorber are as per The parts by weight are: 80-90 parts by weight of POE, 3-5 parts by weight of antioxidant, and 2-5 parts by weight of ultraviolet absorber.

(4) Add polypropylene, compatibilizer, coupling agent, filler, and toner into a high-speed mixer, stir evenly at a high speed at 100-120°C, and send it to silo C through a pipeline; among them, polypropylene, compatibilizer , Coupling agent, filler and toner are weighed according to parts by weight: 70-80 parts by weight of polypropylene, 1-2 parts by weight of compatibilizer, 0.1-0.2 parts by weight of coupling agent, 3-5 parts by weight of filler, toner 0-1 parts by weight.

(5) The materials in the silo B and the silo C are automatically weighed and mixed at a mass ratio of 1:8-10, and then sent to the first feeding of the screw extruder through the automatic elevator; the material in the silo A is added to the screw The second feeding port of the extruder; the temperature of the screw extruder is set to: 160-180°C for the first stage, 190-200°C for the second stage, 210-220°C for the third stage, 230-225°C for the fourth stage, The fifth section is 160-180°C; the first feeding port is set in the first section, the second feeding port is set between the third section and the fourth section, and the distance between the first feeding port and the second feeding port is controlled at 65-85cm; Extruded through a screw extruder, air-cooled and diced, vibrated and screened, and packaged to obtain a wear-resistant and aging-resistant furniture plastic granule.
A kind of preparation method of wear-resistant and anti-aging furniture plastic particles according to claim 1, is characterized in that: the mass ratio of nano inorganic powder and silicone described in step (1) is 100:0.5-1.
A kind of preparation method of wear-resistant and anti-aging furniture plastic particles according to claim 1, it is characterized in that: nanometer inorganic powder described in step (1) selects nanometer calcium carbonate, nanometer precipitated barium sulfate, nanometer mica powder, nanometer Mongolian A combination of one or more of exfoliated clay, nano-talc, nano-diatomaceous earth, and nano-kaolin.
A kind of preparation method of wear-resistant and anti-aging furniture plastic particles according to claim 1, is characterized in that: the high-speed stirring described in step (1) adopts the stirring speed of 800-1000rpm to stir for 20-30min.
A kind of preparation method of wear-resistant and anti-aging furniture plastic particles according to claim 1, is characterized in that: in step (2), the added amount of inorganic fibers is 15-20% of the mass of nano-particle pre-dispersion; The amount of powder added is 15-20% of the mass of the nanoparticle pre-dispersion; wherein, the inorganic fibers are preferably glass fibers, aluminum silicate fibers, wollastonite fibers, brucite fibers, sepiolite fibers, calcium carbonate crystals At least one of whiskers and calcium sulfate whiskers; the plant fiber powder is one of corn stalks, wheat stalks, and flax stalks that have passed through a 50-mesh screen.
A kind of preparation method of wear-resistant and anti-aging furniture plastic particles according to claim 1, is characterized in that: described in step (3), the antioxidant is selected from one of 1010, DLTP, BHT; the ultraviolet absorber is selected from UV-531.
A kind of preparation method of wear-resistant and anti-aging furniture plastic particles according to claim 1, it is characterized in that: in step (4), the polypropylene selected grade is at least one of EPF30R, EPR30R, EPS30R; The agent is polypropylene grafted maleic anhydride; the coupling agent is one of titanate coupling agent and aluminate coupling agent; the filler is one of glass microbeads and serpentine powder.
A method for preparing wear-resistant and aging-resistant furniture plastic particles according to claim 1, characterized in that: in step (5), the material added by the second feeding port is 15-20% of the mass of the material added by the first feeding port .
A kind of preparation method of wear-resistant and anti-aging furniture plastic particles according to claim 1, is characterized in that: in step (5), described screw extruder selects co-rotating twin-screw extruder, and described screw extruder controls The rotational speed is 150-200rpm.
A wear-resistant and aging-resistant furniture plastic particle, characterized in that it is prepared by the method of any one of claims 1-9.