阅读说明：本技术 一种纳米增强耐磨复合橡胶材料 (Nano-reinforced wear-resistant composite rubber material ) 是由 钱林根 于 2019-11-05 设计创作，主要内容包括：本发明提供了一种纳米增强耐磨复合橡胶材料,其组成包括100重量份的橡胶、20-30重量份的改性针状硅酸盐、3-8重量份多壁碳纳米管和配合剂；步骤如下：将双辊开炼机的辊距调至最小,加入橡胶,然后缓慢加入改性针状硅酸盐和多壁碳纳米管,混合均匀后,再依次加入配合剂得到混合物,在平板硫化机上硫化进行硫化,硫化温度为160℃。将本发明的纳米增强耐磨复合橡胶外覆于金属芯材制备的胶辊,不仅具有良好的耐磨性能,而且具有很好力学性能,能够显著延长胶辊的使用寿命。(The invention provides a nano reinforced wear-resistant composite rubber material, which comprises 100 parts by weight of rubber, 20-30 parts by weight of modified acicular silicate, 3-8 parts by weight of multi-walled carbon nano-tube and a compounding agent; the method comprises the following steps: adjusting the roller distance of a double-roller open mill to be minimum, adding rubber, slowly adding the modified acicular silicate and the multi-wall carbon nano tubes, uniformly mixing, sequentially adding the compounding agents to obtain a mixture, and vulcanizing on a flat vulcanizing machine at the vulcanization temperature of 160 ℃. The rubber roller prepared by coating the nano reinforced wear-resistant composite rubber outside the metal core material has good wear resistance and mechanical property, and can remarkably prolong the service life of the rubber roller.)

1. A nano reinforced wear-resistant composite rubber material is characterized in that: the composition of the composite material comprises 100 parts by weight of rubber, 20-30 parts by weight of modified acicular silicate and 3-8 parts by weight of multi-wall carbon nano-tubes.

2. The nano-reinforced abrasion-resistant composite rubber material according to claim 1, wherein: also comprises a compounding agent.

3. The nano-reinforced abrasion-resistant composite rubber material according to claim 1, wherein: the rubber is nitrile rubber or chloroprene rubber.

4. The nano-reinforced abrasion-resistant composite rubber material according to claim 1, wherein: the needle-shaped silicate is attapulgite or palygorskite.

5. The nano-reinforced abrasion-resistant composite rubber material according to claim 1, wherein: the preparation method of the modified acicular silicate comprises the following steps:

the first step is as follows: purifying the needle-shaped silicate;

the second step is that: crushing by adopting an impact crusher;

the third step: further pulverizing by fluidized bed jet milling;

the fourth step: placing the pulverized acicular silicate in H with pH of 4₂O₂Treating in the solution at 85 deg.C for 3 h;

the fifth step: soaking the treated needle-shaped silicate in 3wt% of polyethyleneimine water solution under the condition of normal temperature and stirring;

and a sixth step: washing unreacted polyethyleneimine by using water, and drying in a drying oven at 105 ℃ for 6 hours to obtain the modified acicular silicate.

6. The nano-reinforced abrasion-resistant composite rubber material according to claim 1, wherein: the particle size of the multi-walled carbon nanotube is 400-700.

7. The nano-reinforced abrasion-resistant composite rubber material according to claim 5, wherein: the particle size of the modified acicular silicate is 20-300 nm.

8. The nano-reinforced abrasion-resistant composite rubber material according to claim 2, wherein: the compounding agent comprises 1-1.5 parts by weight of stearic acid, 2-3 parts by weight of sulfur, 1-2 parts by weight of accelerator DM and 0.5-1 part by weight of accelerator CZ.

9. The preparation method of the nano reinforced abrasion-resistant composite rubber material according to claim 1, wherein the preparation method comprises the following steps: the method comprises the following steps:

adjusting the roller distance of a double-roller open mill to be minimum, adding rubber, slowly adding the modified acicular silicate and the multi-wall carbon nano tubes, uniformly mixing, sequentially adding the compounding agents to obtain a mixture, and vulcanizing on a flat vulcanizing machine at the vulcanization temperature of 160 ℃.

Technical Field

The invention relates to the field of high-molecular functional materials, in particular to a nano-reinforced wear-resistant composite rubber material.

Background

At present, the traditional reinforcing agents used in rubber are carbon black and white carbon black, wherein the carbon black has the best reinforcing effect, and is generally only suitable for black rubber products due to strong coloring capability. The reinforcing effect of white carbon black is second to that of carbon black and exceeds that of any other white reinforcing agent, but the prices of carbon black and white carbon black are higher, so that the development and utilization of reinforcing agents taking abundant natural minerals as raw materials are more and more important for modifying polymers, and for example, the research of acicular silicate/compound composite materials becomes a hot spot.

The acicular silicate is a natural layer chain-like water-containing magnalium silicate mineral containing nano short fibers, typically attapulgite or palygorskite, and has a white, light gray, light green or light brown color depending on the content of impurities. The reserves of attapulgite in China reach 7 billion, the price is only 200-: each unit crystal layer is provided with an upper silicon-oxygen tetrahedron double-chain wafer and a lower silicon-oxygen tetrahedron double-chain wafer, 7 aluminum-oxygen octahedrons are clamped between the two silicon-oxygen tetrahedron double-chain wafers, and each unit layer is connected with each other through oxygen to form a pore canal type crystal structure to form a fibrous single crystal. The single crystal is the most basic structural unit, the diameter of the single crystal is 10-30nm, the length is about 100-2000nm, the single crystal is closely arranged in parallel to form a crystal beam, and the crystal beam is mutually gathered to form micron-sized particles. Attapulgite has special structure and properties, and high use value, and is called as "Qianbaizhu soil".

The wear resistance of rubber directly influences the service life of the rubber, namely, fibers or particles are added into the rubber, and a self-lubricating coating is coated on the surface of the rubber. In the first method, the properties of the fibers or particles are particularly important, and various properties of the rubber are directly influenced by selecting different fibers or fillers.

In order to achieve high abrasion resistance of abrasion resistant rubber, it is important to improve the properties of the filler itself in the rubber, and to improve the dispersibility and compatibility of the rubber. In general, the surface of the material is treated by a surfactant or a coupling agent to increase the dispersibility of the filler, but the method has a certain limitation on improving the wear resistance of the material.

Disclosure of Invention

The technical problem to be solved is as follows: in order to solve the above problems, most properties of the rubber are deteriorated with the decrease of the dispersibility, and particularly, tensile strength, dynamic fatigue, hysteresis heat buildup and the like are considered, and therefore, it is important to modify the filler to increase the dispersibility. The present invention has been made in view of the above circumstances, and an object thereof is to provide a nano-reinforced abrasion-resistant composite rubber material.

The technical scheme is as follows:

a nano reinforced wear-resistant composite rubber material comprises 100 parts by weight of rubber, 20-30 parts by weight of modified acicular silicate and 3-8 parts by weight of multi-walled carbon nano-tubes.

Also comprises a compounding agent.

Further, the rubber is nitrile rubber or chloroprene rubber.

Further, the needle-shaped silicate is attapulgite or palygorskite.

Further, the preparation method of the modified acicular silicate comprises the following steps:

the first step is as follows: purifying the needle-shaped silicate;

the second step is that: crushing by adopting an impact crusher;

the third step: further pulverizing by fluidized bed jet milling;

the fourth step: placing the pulverized acicular silicate in H with pH of 4₂O₂Treating in the solution at 85 deg.C for 3 h;

the fifth step: soaking the treated needle-shaped silicate in 3wt% of polyethyleneimine water solution under the condition of normal temperature and stirring;

and a sixth step: washing unreacted polyethyleneimine by using water, and drying in a drying oven at 105 ℃ for 6 hours to obtain the modified acicular silicate.

Furthermore, the particle size of the multi-walled carbon nanotube is 400-700.

Further, the particle size of the modified acicular silicate is 20-300 nm.

Further, the compounding agent comprises 1-1.5 parts by weight of stearic acid, 2-3 parts by weight of sulfur, 1-2 parts by weight of accelerator DM and 0.5-1 part by weight of accelerator CZ.

The preparation method of the nano reinforced wear-resistant composite rubber material comprises the following steps:

adjusting the roller distance of a double-roller open mill to be minimum, adding rubber, slowly adding the modified acicular silicate and the multi-wall carbon nano tubes, uniformly mixing, sequentially adding the compounding agents to obtain a mixture, and vulcanizing on a flat vulcanizing machine at the vulcanization temperature of 160 ℃.

The nano reinforced wear-resistant composite rubber is used for preparing rubber rollers, and the prepared rubber rollers have high wear resistance and mechanical properties.

Has the advantages that:

1. the acicular silicate particles in the invention can be fully dissociated into a plurality of nano fibers after being crushed and purified.

2. The needle-shaped silicate purified by the method is modified by polyethyleneimine, so that the dispersibility is good, the stress concentration in the composite material is reduced, and the bonding area of an interface region is increased.

3. In the invention, polyethyleneimine molecules contain a large amount of primary amine, secondary amine and tertiary amine groups, and can react with the surfaces of the needle-shaped silicate fibers, so that the agglomeration among the needle-shaped silicates is reduced, the needle-shaped silicates are dispersed in rubber more uniformly, and the needle-shaped silicates are combined with the rubber more tightly.

Detailed Description