阅读说明：本技术 一种高刚性高韧性聚丙烯防静电复合材料及制备方法 (High-rigidity high-toughness polypropylene antistatic composite material and preparation method thereof ) 是由 顾正阳 庄晓荣 于 2019-12-05 设计创作，主要内容包括：一种高刚性高韧性聚丙烯防静电复合材料及制备方法。主要解决了目前薄壁轻量化防静电周转箱、可折叠防静电周转箱和载重量大的防静电周转车底盘的材料成本较高,材料性能不佳的问题。本发明提供一种高刚性高韧性聚丙烯防静电复合材料,成本低廉,易于工业化生产和应用,是制备薄壁轻量化防静电周转箱、可折叠防静电周转箱和载重量大的防静电周转车底盘的理想材料。(A high-rigidity high-toughness antistatic polypropylene composite material and a preparation method thereof. The problem of present thin wall lightweight prevent that static turnover case, collapsible prevent that static turnover case and carrying capacity are big prevent that the material cost of static turnover vehicle chassis is higher, the material property is not good is mainly solved. The invention provides a high-rigidity high-toughness polypropylene anti-static composite material which is low in cost and easy to industrially produce and apply, and is an ideal material for preparing thin-wall lightweight anti-static turnover boxes, foldable anti-static turnover boxes and anti-static turnover vehicle chassis with large carrying capacity.)

1. The high-rigidity high-toughness antistatic polypropylene composite material is characterized in that: comprises the following components in percentage by weight:

20-50 parts of homopolymerized PP;

30-50 parts of copolymerized PP;

10-30 parts of talcum powder;

0.2-0.5 part of silane coupling agent;

1-5 parts of a nano reinforcing agent;

0.5-3 parts of a compatilizer;

5-20 parts of carbon black;

3-5 parts of a toughening agent;

the balance of other auxiliary agents.

2. The high-rigidity high-toughness polypropylene antistatic composite material as claimed in claim 1, wherein: the homopolymerized PP is wire drawing grade S1003.

3. The high-rigidity high-toughness polypropylene antistatic composite material as claimed in claim 1, wherein: the copolymerized PP is K8009.

4. The high-rigidity high-toughness polypropylene antistatic composite material as claimed in claim 1, wherein: the talcum powder contains silicon more than 50%, has a particle size D50 between 0.5 and 5 microns, and is treated by a coupling agent.

5. The high-rigidity high-toughness polypropylene antistatic composite material as claimed in claim 1, wherein: the coupling agent is one or a mixture of more of silane coupling agent, titanate coupling agent, aluminate coupling agent and rare earth coupling agent.

6. The high-rigidity high-toughness polypropylene antistatic composite material as claimed in claim 1, wherein: the nano reinforcing agent is one or a mixture of nano silicon dioxide and nano montmorillonite.

7. The high-rigidity high-toughness polypropylene antistatic composite material as claimed in claim 1, wherein: the carbon black is one or a mixture of two of ultra-dense high-graphitization carbon black 250G and 150G.

8. The high-rigidity high-toughness polypropylene antistatic composite material as claimed in claim 1, wherein: the toughening agent is one or a mixture of two of POE and EPDM.

9. The high-rigidity high-toughness polypropylene antistatic composite material as claimed in claim 1, wherein: the other auxiliary agents comprise an antioxidant and a dispersing agent, and the dispersing agent is oxidized polyethylene wax or EBS or a mixture of the oxidized polyethylene wax and the EBS.

10. The preparation method of the high-rigidity high-toughness polypropylene antistatic composite material as claimed in any one of claims 1 to 9, wherein the preparation method comprises the following steps: the method comprises the following steps:

dispersing a nano reinforcing agent in ethanol by using a high-speed mixer to obtain nano reinforcing agent dispersion liquid;

coupling talcum powder with a coupling agent in a high-speed stirrer for 5-10 minutes, adding a nano reinforcing agent dispersion liquid, stirring at a high speed, enabling the temperature in the stirrer to gradually reach 70-80 ℃, stirring for 20-30 minutes, and exhausting gas in a pulse filter bag type to enable more than 90% of ethanol to volatilize from the materials;

step three, putting the homopolymerized PP, the copolymerized PP, the compatilizer, the flexibilizer and other auxiliaries into a stirrer together, mixing for 5-10 minutes, discharging and feeding into an extruder for main feeding; feeding carbon black from the side of the fourth section of the cylinder;

and step four, extruding the material.

Technical Field

The invention relates to a composite material for injection molding of a light anti-static turnover box, a foldable anti-static turnover box, a high-load anti-static turnover vehicle and the like, belonging to materials used in the fields of electronics and military industry.

Background

The polypropylene is a thermoplastic resin with the highest cost performance at present, has the advantages of light specific gravity, flexible molecular chain, high thermal decomposition temperature, wide processing temperature window, strong chemical inertness and the like, and is an ideal resin for preparing composite materials. In addition, fillers such as carbon black and the like endowing polypropylene with antistatic performance greatly reduce the toughness of the antistatic turnover box, so that the antistatic turnover box popular in the market has large wall thickness and is heavy, and difficulty is caused in transportation.

The problem that the common turnover box is high in transportation cost is solved to a great extent through the foldable design, but movable parts exist in the foldable design, so that higher requirements on the rigidity and the impact toughness of materials are met, and a mature foldable anti-static turnover box product does not exist in the current market.

The chassis of the load transfer vehicle is generally made of high-strength and high-toughness common PP materials, but the common PP materials are easy to generate static electricity due to high insulation, so that the application of the load transfer vehicle to the electronic field and the places such as flammable and explosive gunpowder storage is limited.

Carbon fiber is used for replacing carbon black to fill polypropylene, so that the physical property requirement of the material can be met, but the carbon fiber is high in price and limited in market popularization.

Disclosure of Invention

In order to overcome the defects of the background art, the invention provides a high-rigidity high-toughness polypropylene anti-static composite material, which mainly solves the problems of high material cost and poor material performance of the existing thin-wall lightweight anti-static turnover box, foldable anti-static turnover box and anti-static turnover vehicle chassis with large carrying capacity.

The technical scheme adopted by the invention is as follows:

the high-rigidity high-toughness polypropylene antistatic composite material comprises the following components in percentage by weight:

20-50 parts of homopolymerized PP;

30-50 parts of copolymerized PP;

10-30 parts of talcum powder;

0.2-0.5 part of silane coupling agent;

1-5 parts of a nano reinforcing agent;

0.5-3 parts of a compatilizer;

5-20 parts of carbon black;

3-5 parts of a toughening agent;

the balance of other auxiliary agents.

The homopolymerized PP is wire drawing grade S1003.

The copolymerized PP is K8009.

The talcum powder contains silicon more than 50%, has a particle size D50 between 0.5 and 5 microns, and is treated by a coupling agent.

The coupling agent is one or a mixture of more of silane coupling agent, titanate coupling agent, aluminate coupling agent and rare earth coupling agent.

The nano reinforcing agent is one or a mixture of nano silicon dioxide and nano montmorillonite.

The carbon black is one or a mixture of two of ultra-dense high-graphitization carbon black 250G and 150G.

The toughening agent is one or a mixture of two of POE and EPDM.

The other auxiliary agents comprise an antioxidant and a dispersing agent, and the dispersing agent is oxidized polyethylene wax or EBS or a mixture of the oxidized polyethylene wax and the EBS.

The preparation method of the high-rigidity high-toughness antistatic polypropylene composite material comprises the following steps:

dispersing a nano reinforcing agent in ethanol by using a high-speed mixer to obtain nano reinforcing agent dispersion liquid;

coupling talcum powder with a coupling agent in a high-speed stirrer for 5-10 minutes, adding a nano reinforcing agent dispersion liquid, stirring at a high speed, enabling the temperature in the stirrer to gradually reach 70-80 ℃, stirring for 20-30 minutes, and exhausting gas in a pulse filter bag type to enable more than 90% of ethanol to volatilize from the materials;

step three, putting the homopolymerized PP, the copolymerized PP, the compatilizer, the flexibilizer and other auxiliaries into a stirrer together, mixing for 5-10 minutes, discharging and feeding into an extruder for main feeding; carbon black was added by side feeding from the fourth section of the barrel.

And step four, extruding the material.

The invention has the beneficial effects that: the invention provides a high-rigidity high-toughness polypropylene anti-static composite material which is low in cost and easy to industrially produce and apply, and is an ideal material for preparing thin-wall lightweight anti-static turnover boxes, foldable anti-static turnover boxes and anti-static turnover vehicle chassis with large carrying capacity.

Drawings

FIG. 1 is a graph showing the comparative performance of the present invention compared to a conventional product.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which: the high-rigidity high-toughness polypropylene antistatic composite material comprises the following components in percentage by weight:

20-50 parts of homopolymerized PP;

30-50 parts of copolymerized PP;

10-30 parts of talcum powder;

0.2-0.5 part of silane coupling agent;

1-5 parts of a nano reinforcing agent;

0.5-3 parts of a compatilizer;

5-20 parts of carbon black;

3-5 parts of a toughening agent;

the balance of other auxiliary agents.

The homopolymerized PP is wire drawing grade S1003. Drawing grade S1003 for medium petrochemical production is preferred.

The copolymerized PP is K8009. Preferably, taiwan chemical production K8009.

The talcum powder contains silicon more than 50%, has a particle size D50 between 0.5 and 5 microns, and is treated by a coupling agent. The 1100 silane coupling agent of Nanjing eosin is preferred.

The coupling agent is one or a mixture of more of silane coupling agent, titanate coupling agent, aluminate coupling agent and rare earth coupling agent.

The nano reinforcing agent is one or a mixture of nano silicon dioxide and nano montmorillonite.

The carbon black is one or a mixture of two of ultra-dense high-graphitization carbon black 250G and 150G.

The toughening agent is one or a mixture of two of POE and EPDM. Preferably Dow Corning ENGAGE 8150 and Widamei 6102 FL.

The other auxiliary agents comprise an antioxidant and a dispersing agent, and the dispersing agent is oxidized polyethylene wax or EBS or a mixture of the oxidized polyethylene wax and the EBS.

The preparation method of the high-rigidity high-toughness antistatic polypropylene composite material comprises the following steps:

dispersing a nano reinforcing agent in ethanol by using a high-speed mixer to obtain nano reinforcing agent dispersion liquid;

coupling talcum powder with a coupling agent in a high-speed stirrer for 5-10 minutes, adding a nano reinforcing agent dispersion liquid, stirring at a high speed, enabling the temperature in the stirrer to gradually reach 70-80 ℃, stirring for 20-30 minutes, and exhausting gas in a pulse filter bag type to enable more than 90% of ethanol to volatilize from the materials;

step three, putting the homopolymerized PP, the copolymerized PP, the compatilizer, the flexibilizer and other auxiliaries into a stirrer together, mixing for 5-10 minutes, discharging and feeding into an extruder for main feeding; carbon black was added by side feeding from the fourth section of the barrel.

And step four, extruding the material.

The invention has the technical effects that:

according to the invention, the copolymerized PP and the homopolymerized PP are used as the resin base materials together, so that balanced mechanical properties can be provided;

dispersing a nano reinforcing agent into ethanol to form a dispersion liquid of nano particles, which is beneficial to dispersing aggregate of the nano particles into the nano particles;

the nano reinforced dispersion liquid is dispersed into the superfine talcum powder with large specific surface area, so that the nano particles can be kept in a good dispersion state after ethanol is volatilized, and better conditions are provided for good dispersion in resin in the next step.

The effect of the nano reinforcing agent is mainly reflected in that the nucleation of the polypropylene is induced, and the nano reinforcing agent, the talcum powder and the carbon powder act on the growth process of crystal nucleus together to ensure that crystal grains are fine and uniform.

The compatilizer and the coupling agent provide a good bonding interface between the polypropylene and the inorganic powder, so that the whole blend system can show good toughness of the resin and can well play a stiffening effect of the inorganic filler.

The toughening agent has the functions of refining crystal grains and preventing crack propagation of the system under external force.