CN110551359A

CN110551359A - Lawn filling particles and preparation method thereof

Info

Publication number: CN110551359A
Application number: CN201910984172.XA
Authority: CN
Inventors: 刘虎
Original assignee: Shuyang Julong Jiarui New Materials Co Ltd
Current assignee: Shuyang Julong Jiarui New Materials Co Ltd
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2019-12-10

Abstract

The invention belongs to the field of rubber preparation, and particularly relates to lawn filling particles and a preparation method thereof, wherein the lawn filling particles are prepared from the following raw materials in percentage by weight: 20-45% of SEBS rubber powder, 5-10% of LLDPE powder, 15-25% of naphthenic oil, 10-20% of heavy calcium carbonate subjected to surface treatment, 20-30% of nano-smectite subjected to surface treatment, UV 5311-5% of ultraviolet absorbent, 1-3% of antioxidant, 3-5% of odor adsorbent and 1-3% of toner, and the components are subjected to melt blending, extrusion and grain cutting according to a certain proportion to obtain the lawn filling particles. The invention increases the molecular binding force, obviously improves the tearing resistance, prolongs the service life of the lawn filling particles, absorbs most volatile organic compounds, reduces the organic matter odor concentration of the lawn filling particles, and has the characteristics of environmental protection, health and no odor.

Description

Lawn filling particles and preparation method thereof

Technical Field

The invention relates to lawn filling particles and a preparation method thereof.

background

since the turf is made of polymer strands, quartz sand or TPE pellets are required to press the grass strands to stabilize the turf.

the artificial turf in the football court does not have soil, because the human body atress is great when sportsman collides or falls, is injured very easily, adds the sensation that the TPE micelle of high elasticity can effectively simulate soil, prevents the health because of the injury that takes place with the football place collision.

in the prior art, the lawn particles are usually too much in the aspects of elasticity and environmental protection, the service life is neglected, the tensile strength of the common lawn can reach 30MPA, but the material is too hard, the hardness reaches 60A, the elongation at break is only 220%, and the material is too hard and lacks elasticity; the other is that the tensile strength is 16MPA, the hardness is 50A, the elongation at break is 400%, and the material has insufficient strength, so that the service life is only about 2 years.

In the process of ball competition or other sports, athletes run and turn continuously to tear lawn particles greatly and are easy to break, and the continuously broken lawn particles cannot play a role in filling and supporting grass filaments, so that the turf collapses and loses elasticity, and the sports personnel cannot play a good role in protecting the body; furthermore, with the requirement of the country for environmental protection becoming higher and higher, the lawn filling particles are outdoor articles, and are exposed to the sun for a long time, the ageing of rubber can have volatile gas to distribute from the lawn particles constantly, although the lawn particles on the market all add the anti-aging auxiliary agent in the course of processing, this emergence that can only delay ageing, slow ageing process also is the process that organic gas constantly volatilizes, through the analysis contrast of volatile organic matter concentration in the ageing test process, the total volatile organic matter content of ordinary lawn particles is: 75mg/kg, even as high as 200mg/kg, seriously influences the exercise environment and harms the human body.

Disclosure of Invention

The invention aims to provide lawn filling particles and a preparation method thereof, which have the characteristics of ultralow odor and environmental protection, have the characteristic of tearing resistance, and effectively prolong the service life of the particles.

In order to solve the technical problems, the invention provides lawn filling particles which are prepared from the following raw materials in percentage by weight: 20-45% of SEBS rubber powder, 5-10% of LLDPE powder, 15-25% of naphthenic oil, 10-20% of surface-treated heavy calcium carbonate, 20-30% of surface-treated nano-smectite, 11-5% of ultraviolet absorbent UV, 1-3% of antioxidant, 3-5% of odor adsorbent and 1-3% of toner.

Wherein the surface treatment of the heavy calcium carbonate and the surface treatment of the nano-smectite are both coupling agent activation treatment.

wherein the activation treatment step of the heavy calcium carbonate comprises the following steps: placing 10-20 wt% of heavy calcium carbonate into a high-speed mixer, stirring at a high speed, and adding 3-5 wt% of coupling agent in the stirring process for activation;

The nano-smectite clay activation treatment steps are as follows: the nano-montmorillonite with the weight of 20-30% is put into a high-speed mixer to be stirred at a high speed, and 2-6% of coupling agent by weight is added in the stirring process to be activated.

wherein the mesh number of the heavy calcium carbonate is 5000 meshes.

Wherein the odor adsorbent is nano-scale mesoporous structure silicon dioxide with the particle size of 90nm, and the specific surface area is more than 500m ²/g.

A preparation method of lawn filling particles comprises the following steps:

1) Pouring 20-45% of SEBS rubber powder, 5-10% of LLDPE powder, 1-5% of ultraviolet absorber UV531, 3-5% of mesoporous structure silicon dioxide, 1-3% of antioxidant and 1-3% of toner, activated 10-20% of heavy calcium carbonate and 20-30% of nano-smectite clay into a high-speed mixer for high-speed stirring, and in the stirring process, slowly adding 15-25% of naphthenic oil into the high-speed mixer by an oil pump for stirring until the rubber powder is completely filled with oil to form rice paste, and then keeping for later use;

2) continuously feeding the rice paste raw material through a double-screw feeder, wherein the length-diameter ratio of the rice paste raw material is 44: 1, melt-extruding by a double-screw extruder, cooling by water, blowing by a fan, and then cutting by a granulator, wherein the vacuum port of the extruder is kept at a vacuum value of not less than 0.8 Mpa.

the invention has the beneficial effects that:

1. The nano montmorillonite is used as an auxiliary reinforcing filler, and due to the special nano needle-shaped structure of the montmorillonite, the high elasticity of the lawn particles is ensured, the reinforcing effect similar to that of glass fibers serving as a reinforcing material in engineering plastics can be achieved, stronger interface bonding force is generated in rubber, the tearing resistance of the lawn particles can be greatly improved, and the actual service life can be prolonged by 2 to 3 years; injecting the lawn particles into ASTM standard sample strips through an injection molding machine, and testing the tensile strength and the elongation of the sample strips;

2. The tensile strength of the invention can reach 28MPA, the hardness is 52A, the elongation at break is 630%, the product has better motion experience, and the product has better cost performance because of excellent tearing resistance, increased service life;

3. the nano-silica with the mesoporous structure is added in the formula of the product as an adsorbent of organic smell, so that organic gas generated by rubber aging in the processes of product processing and long-term exposure to sunlight can be greatly adsorbed, and the organic gas is adsorbed in the product, thereby blocking the emission of smell, reducing the concentration of organic matter smell of the product, and ensuring that the product is really healthy and odorless;

4. The inorganic filler subjected to surface treatment can greatly improve the interface bonding force with the rubber powder SEBS, so that the lawn filling particles can have smoother appearance and longer wear resistance, and still have very high elasticity and bright color under long-time burning.

Detailed Description

Example 1

The lawn filling particles are prepared from the following raw materials in percentage by weight: 33% of SEBS rubber powder, 5% of LLDPE powder, 15% of naphthenic oil, 20% of ground calcium carbonate with the mesh number of 2500 subjected to surface activation treatment, 20% of nano-grade smectite with the surface subjected to activation treatment, UV 5311% of ultraviolet absorbent, 1% of antioxidant, 4% of mesoporous-structure wollastonite and 1% of toner.

Wherein, the activation treatment step of the heavy calcium carbonate is as follows: placing 20% of heavy calcium carbonate into a high-speed mixer, stirring at a high speed, and adding 4% of coupling agent KH550 during stirring for activation;

The nano-smectite clay activation treatment steps are as follows: and (3) putting the nano-montmorillonite with the weight of 20% into a high-speed mixer, stirring at a high speed, and adding 2% of coupling agent KH550 by weight during stirring for activation.

A preparation method of lawn filling particles comprises the following steps:

1) Pouring 33% of SEBS rubber powder, 5% of LLDPE powder, 15% of naphthenic oil, 1% of ultraviolet absorber UV531, 4% of mesoporous-structure wollastonite, 1% of antioxidant and 1% of toner into a high-speed mixer for high-speed stirring, and in the stirring process, slowly adding 15% of naphthenic oil into the high-speed mixer by using an oil pump, stirring until the rubber powder is completely filled with oil to form rice paste, and then keeping for later use;

The lawn filling particles are detected to have the hardness of 46D, the stretching of the lawn filling particles reaches 15MPA, the breaking elongation of the lawn filling particles is 620%, and the odor concentration of the product is as follows: 8 mg/kg.

example 2

the lawn filling particles are prepared from the following raw materials in percentage by weight: 22% of SEBS rubber powder, 10% of LLDPE powder, 18% of naphthenic oil, 15% of ground calcium carbonate with the mesh number of 2500 subjected to surface activation treatment, 25% of nano-smectite with the surface subjected to activation treatment, UV 5312% of ultraviolet absorbent, 1.5% of antioxidant, 4.5% of mesoporous-structure wollastonite and 2% of toner.

Wherein, the activation treatment step of the heavy calcium carbonate is as follows: placing heavy calcium carbonate with the weight of 15% into a high-speed mixer, stirring at a high speed, and adding 2.5% of a coupling agent KH550 during stirring for activation;

The nano-smectite clay activation treatment steps are as follows: the nano-montmorillonite with the weight of 25% is put into a high-speed mixer to be stirred at a high speed, and 3.5% of coupling agent KH550 by weight is added in the stirring process to be activated.

A preparation method of lawn filling particles comprises the following steps:

1) Pouring 22% of SEBS rubber powder, 10% of LLDPE powder, 2% of ultraviolet absorbent UV531, 4.5% of mesoporous-structure wollastonite, 1.5% of antioxidant and 2% of toner into a high-speed mixer for high-speed stirring, and in the stirring process, slowly adding 18% of naphthenic oil into the high-speed mixer by using an oil pump, stirring until the rubber powder is completely filled with oil to form rice paste, and then keeping for later use;

The lawn filling particles are detected to have the hardness of 51D, the tensile strength of 18MPA, the elongation at break of 486 percent and the odor concentration of the product as follows: 5 mg/kg.

in light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. the lawn filling particle is characterized by being prepared from the following raw materials in percentage by weight: 20-45% of SEBS rubber powder, 5-10% of LLDPE powder, 15-25% of naphthenic oil, 10-20% of surface-treated heavy calcium carbonate, 20-30% of surface-treated nano-smectite, 11-5% of ultraviolet absorbent UV, 1-3% of antioxidant, 3-5% of odor adsorbent and 1-3% of toner.

2. The lawn infill particle of claim 1, wherein:

The surface treatment of the heavy calcium carbonate and the surface treatment of the nano-smectite are both coupling agent activation treatment.

3. The lawn infill particle of claim 2, wherein:

The activation treatment steps of the heavy calcium carbonate are as follows: placing 10-20 wt% of heavy calcium carbonate into a high-speed mixer, stirring at a high speed, and adding 3-5 wt% of coupling agent in the stirring process for activation;

4. The lawn infill particle of claim 1, wherein:

The mesh number of the heavy calcium carbonate is 5000 meshes.

5. The lawn infill particle of claim 1, wherein:

the odor adsorbent is nano-scale mesoporous structure silicon dioxide with the particle size of 90nm, and the specific surface area is more than 500m ²/g.

6. a method of preparing lawn infill particles as claimed in any one of claims 1 to 5, comprising the steps of: