阅读说明：本技术 一种绿色环保高弹性抗静电阻燃人造草坪填充颗粒及制备方法 (Environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particle and preparation method thereof ) 是由 郑玉婴 曹爱萍 于文泰 于 2020-04-21 设计创作，主要内容包括：本发明公开了一种绿色环保高弹性抗静电阻燃人造草坪填充颗粒及制备方法,其所用原料按重量份数计为：橡塑弹性体200份、聚乳酸10-30份、白油1-2份、复合膨胀型抗静电阻燃剂10-20份、蒙脱土50-70份、蛭石粉15-25份、偶联剂2-4份、硬脂酸锌1-2份。本发明制得的人造草坪填充颗粒材料具有绿色环保、高弹性、抗静电、阻燃效果好、拉伸强度高等特性,具有广阔的应用前景和市场需求。(The invention discloses a green environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particle and a preparation method thereof, wherein the green environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particle comprises the following raw materials in parts by weight: 200 parts of rubber-plastic elastomer, 10-30 parts of polylactic acid, 1-2 parts of white oil, 10-20 parts of composite intumescent antistatic flame retardant, 50-70 parts of montmorillonite, 15-25 parts of vermiculite powder, 2-4 parts of coupling agent and 1-2 parts of zinc stearate. The artificial turf filling particle material prepared by the invention has the characteristics of environmental protection, high elasticity, static resistance, good flame retardant effect, high tensile strength and the like, and has wide application prospect and market demand.)

1. The environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particle is characterized in that: the raw materials are as follows by weight: 200 parts of rubber-plastic elastomer, 10-30 parts of polylactic acid, 1-2 parts of white oil, 10-20 parts of composite intumescent antistatic flame retardant, 50-70 parts of montmorillonite, 15-25 parts of vermiculite powder, 2-4 parts of coupling agent and 1-2 parts of zinc stearate.

2. The environment-friendly high-elasticity antistatic flame-retardant artificial turf infill particle of claim 1, wherein: the rubber-plastic elastomer is a blend of two or more of ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, polyethylene grafted maleic anhydride, ethylene-octene copolymer and polypropylene.

3. The environment-friendly high-elasticity antistatic flame-retardant artificial turf infill particle of claim 1, wherein: the composite intumescent antistatic flame retardant is a blend of 3 or more than 3 of melamine phosphate, melamine cyanurate, melamine polyphosphate, melamine pyrophosphate, graphene oxide, expanded graphite, pentaerythritol and nano aluminum oxide.

4. The environment-friendly high-elasticity antistatic flame-retardant artificial turf infill particle of claim 1, wherein: the vermiculite powder is 325 meshes.

5. The environment-friendly high-elasticity antistatic flame-retardant artificial turf infill particle of claim 1, wherein: the coupling agent is a titanate coupling agent or a silane coupling agent.

6. A method for preparing the green environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particle as claimed in claim 1, which is characterized in that: the method comprises the following specific steps:

1) uniformly mixing the rubber-plastic elastomer and polylactic acid, drying for 4 h at 80 ℃, then adding white oil, mechanically stirring at 60 ℃ and filling oil until the mixture is dried;

2) uniformly mixing the rubber-plastic mixed material obtained in the step 1) and the composite intumescent antistatic flame retardant in a high-speed mixer, adding montmorillonite, vermiculite powder and zinc stearate, and simultaneously dropwise adding a coupling agent while stirring;

3) and extruding the mixed materials in a double-screw extruder, and cooling and granulating the materials through water to obtain the environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particles.

7. The preparation method of the green environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particle as claimed in claim 6, wherein the preparation method comprises the following steps: and 3) during extrusion, the temperature of the double-screw extruder is 160-185 ℃, and the rotating speed is 30-60 r/min.

Technical Field

The invention belongs to the technical field of artificial turf fillers, and particularly relates to a method for preparing high-elasticity antistatic flame-retardant artificial turf filler particles by taking a rubber-plastic composite material as a main body and matching an intumescent composite flame retardant and various inorganic fillers.

Background

At present, domestic natural lawns are gradually replaced by artificial lawns due to the disadvantages of high investment, difficult maintenance, great influence by seasons and the like. The artificial turf filling particles play a very important role in the whole artificial turf system, and also play a role in fixing the grass filaments and increasing the surface elasticity, so that the injury probability of athletes is reduced in the process of sports.

China published in 2006 "requirements for use of artificial material sports fields and inspection methods — part 3: the national standard of the artificial grass surface layer of the football field. Traction generated by the shoe and field interaction surface is an important detection aspect in evaluation of artificial lawns at home and abroad and is also considered to be an important factor influencing the action form, athletic performance and injury of athletes. The type, density, type, size, depth and density of the filler of the artificial turf may cause the effect of the traction of the interactive surface to change. Therefore, the type of artificial turf infill is also very important.

Most stadiums and parks in China, particularly football stadiums in campuses, adopt artificial lawns. These artificial lawns, in addition to being training sites for football enthusiasts, are often used to organize concerts, group building activities, and the like. The use rate is very high, and the use population is very wide. Therefore, the safety and environmental protection of the artificial turf filler are particularly important, and the functional modification of the artificial turf filler is imperative.

Currently, artificial turf infill particles are mainly of three types: 1) waste tire filler particles; 2) vulcanized EPDM filler particles; 3) thermoplastic elastomer filler particles. The waste tire filling particles and vulcanized EPDM filling particles are not environment-friendly enough, and the requirements of modern people on good life can not be met no matter in service life or safety, so that the thermoplastic elastomer filling particles are produced at the same time. The mainstream thermoplastic elastomers in the market are mainly SSBR, EPDM, EVA, PE-MAH, TPE elastic granules and the like, wherein the SSBR and TPE granules are the most common, and the single use of the SSBR and TPE granules has low rebound resilience and extremely poor flame retardant property. Therefore, a novel rubber-plastic composite material filling particle for the artificial turf filling particle needs to be found, so that the antistatic flame retardant property and the mechanical property of the turf filler are further improved on the premise of ensuring green, environmental protection, thermoplasticity and recoverability.

Disclosure of Invention

The invention aims to solve the problems that the existing rubber and plastic materials are low in comprehensive performance and do not have antistatic flame retardance, and provides the environment-friendly high-elasticity antistatic flame-retardant artificial turf particles.

In order to achieve the purpose, the invention adopts the following technical scheme:

the green environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particle comprises the following raw materials in parts by weight: 200 parts of rubber-plastic elastomer, 10-30 parts of polylactic acid, 1-2 parts of white oil, 10-20 parts of composite intumescent antistatic flame retardant, 50-70 parts of montmorillonite, 15-25 parts of vermiculite powder, 2-4 parts of coupling agent and 1-2 parts of zinc stearate.

The rubber-plastic elastomer is a blend of two or more of ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, polyethylene grafted maleic anhydride, ethylene-octene copolymer and polypropylene. Preferably, the rubber-plastic elastomer is prepared by blending ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and polyethylene grafted maleic anhydride according to the mass ratio of 3:5: 2.

The polylactic acid is also called polylactide, has sufficient raw material sources, can be regenerated, and is an ideal green polymer material. The flame-retardant polyester fiber has good thermal stability, the processing temperature can be 170-230 ℃, the solvent resistance is good, the processing can be carried out in various modes (such as extrusion, spinning, biaxial stretching and injection blow molding), and the flame-retardant polyester fiber also has certain antibacterial property, flame retardance and ultraviolet resistance. Meanwhile, the added polylactic acid and white oil can further ensure the mechanical property of the composite material.

The composite intumescent antistatic flame retardant is a blend of 3 or more than 3 of melamine phosphate, melamine cyanurate, melamine polyphosphate, melamine pyrophosphate, graphene oxide, expanded graphite, pentaerythritol and nano aluminum oxide. Melamine phosphate is a common intumescent flame retardant, has excellent flame retardant effect, and is commonly used in thermoplastic elastomers. Preferably, the composite intumescent antistatic flame retardant is prepared by blending melamine phosphate, graphene oxide and nano-alumina according to the mass ratio of 2:1: 2. Under the condition of reducing the dosage of additive flame retardant (melamine salts) as much as possible, the invention compounds the nano-alumina with antistatic effect and the graphene oxide which can resist flame and resist static electricity with the intumescent antistatic flame retardant and effectively plays the role of the flame retardant in the composite rubber and plastic material.

The graphene oxide is prepared by adopting a modified Hummers method, and the preparation method comprises the following steps:

a) adding 1g of graphite into 23 ml of 98% concentrated sulfuric acid, and stirring in a water bath kettle;

b) after the solution is uniformly stirred, adding 3 g of potassium permanganate for a plurality of times in a small amount within 2 hours;

c) stirring for 2 h, heating to 98 ℃, and adding 44 ml of deionized water;

d) after 5 min, slowly dropwise adding a hydrogen peroxide solution with the mass concentration of 5% until the sample does not bubble any more;

e) after the sample does not bubble for 5 min, adding 20 ml of HCl solution with the mass concentration of 5%, reacting for 5 min, and stopping stirring;

f) uniformly dispersing a sample into a centrifuge tube, adding sufficient deionized water, and centrifuging under the condition of 7000r/min until the pH value of the solution is 7;

g) the collected precipitate was poured into an iron pan, lyophilized at-60 ℃ for 6 h, and immediately evacuated until the sample was completely dried.

The montmorillonite is a natural mineral of silicate, has strong adsorption capacity and good dispersion performance, is widely applied to the polymer material industry as an additive of a nano polymer material, and can improve the impact resistance, the fatigue resistance, the dimensional stability, the gas barrier property and the like, thereby playing a role in enhancing the comprehensive physical properties of the polymer and simultaneously improving the material processing performance.

The vermiculite powder is a hydrate, is in the shape of blocks, sheets and grains, is a product of weathering and corrosion of natural minerals such as biotite, is light and is not easy to rot, and the mesh number of the vermiculite powder is 325 meshes.

The coupling agent is a titanate coupling agent or a silane coupling agent, can well couple organic matters and inorganic matters, and has the effect of enhancing the interface performance of the inorganic matters and the organic matters.

The preparation method of the green environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particles comprises the following steps:

1) uniformly mixing the rubber-plastic elastomer and polylactic acid, drying for 4 hours in an oven at 80 ℃, then adding white oil, mechanically stirring at 60 ℃, and filling oil until the mixture is dried;

2) uniformly mixing the rubber-plastic mixed material obtained in the step 1) and the composite intumescent antistatic flame retardant in a high-speed mixer, adding montmorillonite, vermiculite powder and zinc stearate, and simultaneously dropwise adding a coupling agent while stirring;

3) and extruding the mixed materials in a double-screw extruder at the temperature of 160-185 ℃ and at the speed of 30-60 r/min, and cooling and pelletizing the materials through water to obtain the green environment-friendly high-elasticity antistatic flame-retardant artificial turf filling particles.

The invention has the beneficial effects that:

1) compared with the traditional method of taking waste tires and vulcanized EPDM as raw materials, the artificial turf filling particles have the advantages of green and environment-friendly formula, no odor and recycling after use;

2) the invention widens the application of the rubber-plastic material in the field of artificial turf filling materials;

3) on the premise of ensuring the performance of the filled particles, the invention is matched with the low-price inorganic filler, so that the consumption of the main material can be reduced, the cost is reduced, and the flame retardant effect of the product can be improved by adding the inorganic filler;

4) according to the invention, by controlling the proportioning amount of the polylactic acid and the composite intumescent antistatic flame retardant in the formula, the filling particles have excellent antistatic and flame retardant properties on the premise of ensuring the mechanical properties of the filling particles.

Detailed Description

In order to make the present invention more comprehensible, the technical solutions of the present invention are further described below with reference to specific embodiments, but the present invention is not limited thereto.