阅读说明：本技术 一种智能机械手吸盘用橡胶及其制备方法 (Rubber for intelligent manipulator sucker and preparation method thereof ) 是由 杨建军 闫高发 周登健 汪必宽 吴庆云 吴明元 张建安 刘久逸 王明 丁小兵 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种智能机械手吸盘用橡胶及其制备方法,涉及高分子化学领域,所述橡胶按重量组分计具体由天然橡胶100份、表面处理石墨烯2～8份、表面处理石膏晶须10～30份、白炭黑10～20份、促进剂1～3份、防老剂1～4份、硬脂酸1～3份、氧化锌2～6份、硫磺3～6份组成；表面处理石墨烯具体的制备方法为：将石墨烯分散在无水乙醇中,然后加入硼酸酯偶联剂,在55℃下机械搅拌反应4h后抽滤、洗涤至中性,干燥并研磨后获得；表面处理石膏晶须具体的制备方法为：石膏晶须加入到含铝酸酯偶联剂的乙醇水溶液中,在65℃下机械搅拌20min,同时控制体系pH范围在4～5之间,反应结束干燥后获得；本发明提供的橡胶对于天然橡胶分子间缺陷起到了很好的填充作用,显著的提高了其刚性和韧性。(The invention discloses rubber for an intelligent manipulator sucker and a preparation method thereof, and relates to the field of polymer chemistry, wherein the rubber specifically comprises 100 parts by weight of natural rubber, 2-8 parts by weight of surface-treated graphene, 10-30 parts by weight of surface-treated gypsum whisker, 10-20 parts by weight of white carbon black, 1-3 parts by weight of accelerator, 1-4 parts by weight of anti-aging agent, 1-3 parts by weight of stearic acid, 2-6 parts by weight of zinc oxide and 3-6 parts by weight of sulfur; the specific preparation method of the surface-treated graphene comprises the following steps: dispersing graphene in absolute ethyl alcohol, adding a boric acid ester coupling agent, performing mechanical stirring reaction at 55 ℃ for 4 hours, performing suction filtration, washing to be neutral, drying and grinding to obtain the graphene-based catalyst; the specific preparation method of the surface treatment gypsum whisker comprises the following steps: adding the gypsum whiskers into an ethanol water solution containing an aluminate coupling agent, mechanically stirring for 20min at 65 ℃, simultaneously controlling the pH range of the system to be 4-5, and drying after the reaction is finished to obtain the gypsum whiskers; the rubber provided by the invention has a good filling effect on the intermolecular defects of the natural rubber, and the rigidity and toughness of the rubber are obviously improved.)

1. The rubber for the intelligent manipulator sucker is characterized by comprising 100 parts by weight of natural rubber, 2-8 parts by weight of surface treatment graphene, 10-30 parts by weight of surface treatment gypsum whisker, 10-20 parts by weight of white carbon black, 1-3 parts by weight of an accelerator, 1-4 parts by weight of an anti-aging agent, 1-3 parts by weight of stearic acid, 2-6 parts by weight of zinc oxide and 3-6 parts by weight of sulfur;

the specific preparation method of the surface-treated graphene comprises the following steps:

dispersing graphene in absolute ethyl alcohol, uniformly mixing, adding a boric acid ester coupling agent, mechanically stirring at 55 ℃ for reaction for 4 hours to obtain a dispersion solution, carrying out suction filtration on the dispersion solution, washing to be neutral, drying and grinding to obtain surface-treated graphene;

the specific preparation method of the surface treatment gypsum whisker comprises the following steps:

adding the gypsum whisker into an ethanol water solution containing an aluminate coupling agent, mechanically stirring for 20min at 65 ℃, simultaneously controlling the pH range of the system to be 4-5, and drying after the reaction is finished to obtain the surface-treated gypsum whisker.

2. The rubber for the sucker of the intelligent mechanical arm as claimed in claim 1, wherein the addition amount of the borate coupling agent accounts for 2-5% of the mass of graphene.

3. The rubber for the intelligent manipulator sucker as claimed in claim 2, wherein the addition amount of the aluminate coupling agent accounts for 3-7% of the mass of the gypsum whisker, the gypsum whisker has an aspect ratio of 60, an ethanol aqueous solution containing the aluminate coupling agent needs to be mechanically stirred for 5min before the gypsum whisker is added, and the volume ratio of ethanol to water is 20: 1.

4. the rubber for the sucker of the intelligent mechanical arm as claimed in claim 3, wherein the accelerator is one of N-tert-butyl-2-benzothiazole sulfonamide or diphenyl guanidine.

5. The rubber for the sucker of the intelligent mechanical arm as recited in claim 4, wherein the anti-aging agent is styrenated phenol.

6. A preparation method of the rubber for the intelligent mechanical arm sucker is characterized by comprising the following steps:

step 1, Material preparation

Preparing materials according to the weight composition of claim 1

Step 2, breaking the natural rubber

Sequentially and continuously adding natural rubber into an internal mixer with a roll gap of 2 mm; thinning and passing, namely after the rubber blocks are crushed, adjusting the roller distance to 0.5mm, controlling the roller temperature at 50 ℃, and thinning and passing for a plurality of times; smashing rubber, namely widening the roller spacing to 1mm, and repeatedly tapping rubber for multiple times after the rubber sheet wraps the roller;

step 3, mixing the rubber material

Adjusting the temperature of a roller to 55 ℃, adjusting the roller spacing to 1mm, wrapping the roller with a film, sequentially adding an accelerator, an anti-aging agent, surface-treated graphene, surface-treated gypsum whiskers, white carbon black, stearic acid, zinc oxide and sulfur, and turning until the mixture is uniformly mixed;

and 4, after mixing is completed, placing the mixed rubber sample for 8 hours, determining the optimal vulcanization process by a rotor-free vulcanizer, and vulcanizing on a flat vulcanizing machine to prepare the composite material sample.

7. The method according to claim 6, wherein the temperature of the vulcanization in the step 4 is 170 ℃ and the vulcanization time is 20 min.

8. The method according to claim 7, wherein the charging interval in the step 3 is 1 min.

Technical Field

The invention relates to the field of polymer chemistry, in particular to rubber for an intelligent manipulator sucker and a preparation method thereof.

Background

In the continuous development of the fields of modern industry and ocean exploration and the improvement of the mechanization and automation level of the production process, the industrial manipulator develops into a novel device by virtue of the obvious characteristics of the industrial manipulator. The device is used as an auxiliary part of the whole machine, has simple action and single working object, and is suitable for large-batch automatic production. The rubber vacuum chuck is a mechanical arm component and one of vacuum equipment actuators, is a connecting part between a conveying system and a workpiece, and is soft and elastic, so that the workpiece is not damaged.

The vacuum sucker is usually manufactured by raw rubber, a reinforcing agent, a plasticizer, a filler, an anti-aging agent, a vulcanizing agent, an active agent and the like, wherein the raw rubber mainly adopts natural rubber, and is a natural polymer compound taking cis-1, 4-polyisoprene as a main component, so that the vacuum sucker has the characteristics of excellent rebound resilience, insulativity, water resistance, good processability, plasticity and the like, but has the defects of poor oil resistance, acid and alkali resistance, heat resistance, cold resistance, aging resistance and wear resistance, and needs to be changed by adding a proper auxiliary agent for treatment.

The natural rubber lacks crystallization capacity and small intermolecular force, so the mechanical property, the electrical property and the like of the natural rubber can meet the application requirements of polymer materials after being enhanced, and the graphene is a novel two-dimensional carbon material and can improve the mechanical property, the electrical conductivity and the like of the rubber as a filler. The performance of the graphene/rubber composite material is affected by various factors, including the dispersion degree of graphene, the interfacial interaction between the rubber matrix and graphene, the crosslinking density of the rubber composite material, and the like. Since the graphene sheets contain rich oxygen-containing functional groups (carboxyl, hydroxyl and the like), after drying, graphene is easy to agglomerate under the action of hydrogen bonds and van der waals force, so that the graphene is not well dispersed in a rubber matrix, and the problem is more prominent particularly when mechanical blending is adopted. Therefore, the research adopts the borate coupling agent to pretreat the graphene, improves the dispersion uniformity of the graphene in the natural rubber in the mechanical blending method, and solves the agglomeration problem and the dispersion performance of the graphene in the rubber matrix.

The gypsum whisker has a highly ordered atomic arrangement structure, almost has no crystal defects, and shows excellent mechanical properties, so the gypsum whisker is often used as a reinforcing agent for rubber and plastic production. However, since gypsum whiskers are inorganic and have high surface energy, and if they are added directly to rubber, they are largely phase-separated and unevenly dispersed, it is necessary to treat the surface of gypsum whiskers to increase the bonding properties with the rubber matrix.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides rubber for an intelligent manipulator sucker and a preparation method thereof, so as to solve the technical problems that graphene is easy to agglomerate, the rubber performance is affected and the like in the prior art.

The invention is realized by the following technical scheme:

the invention provides rubber for an intelligent manipulator sucker, which specifically comprises 100 parts by weight of natural rubber, 2-8 parts by weight of surface-treated graphene, 10-30 parts by weight of surface-treated gypsum whisker, 10-20 parts by weight of white carbon black, 1-3 parts by weight of an accelerator, 1-4 parts by weight of an anti-aging agent, 1-3 parts by weight of stearic acid, 2-6 parts by weight of zinc oxide and 3-6 parts by weight of sulfur;

the specific preparation method of the surface-treated graphene comprises the following steps:

dispersing graphene in absolute ethyl alcohol, uniformly mixing, adding a boric acid ester coupling agent, mechanically stirring at 55 ℃ for reaction for 4 hours to obtain a dispersion solution, carrying out suction filtration on the dispersion solution, washing to be neutral, drying and grinding to obtain surface-treated graphene;

the specific preparation method of the surface treatment gypsum whisker comprises the following steps:

adding the gypsum whisker into an ethanol water solution containing an aluminate coupling agent, mechanically stirring for 20min at 65 ℃, simultaneously controlling the pH range of the system to be 4-5, and drying after the reaction is finished to obtain the surface-treated gypsum whisker.

Furthermore, the addition amount of the borate coupling agent accounts for 2-5% of the mass of the graphene.

Further, the addition amount of the aluminate coupling agent accounts for 3% -7% of the mass of the gypsum whisker, the gypsum whisker has a length-diameter ratio of 60, before the gypsum whisker is added, the ethanol water solution containing the aluminate coupling agent needs to be mechanically stirred for 5min, and the volume ratio of ethanol to water is 20: 1.

further, the accelerator is one of N-tertiary butyl-2-benzothiazole sulfonamide or diphenylguanidine.

Further, the anti-aging agent is styrenated phenol.

The invention also provides a preparation method of the rubber for the intelligent manipulator sucker, which comprises the following steps:

step 1, Material preparation

Preparing materials according to the weight composition of claim 1

Step 2, breaking the natural rubber

Sequentially and continuously adding natural rubber into an internal mixer with a roll gap of 2 mm; thinning and passing, namely after the rubber blocks are crushed, adjusting the roller distance to 0.5mm, controlling the roller temperature at 50 ℃, and thinning and passing for a plurality of times; smashing rubber, namely widening the roller spacing to 1mm, and repeatedly tapping rubber for multiple times after the rubber sheet wraps the roller;

step 3, mixing the rubber material

Adjusting the temperature of a roller to 55 ℃, adjusting the roller spacing to 1mm, wrapping the roller with a film, sequentially adding an accelerator, an anti-aging agent, surface-treated graphene, surface-treated gypsum whiskers, white carbon black, stearic acid, zinc oxide and sulfur, and turning until the mixture is uniformly mixed;

and 4, after mixing is completed, placing the mixed rubber sample for 8 hours, determining the optimal vulcanization process by a rotor-free vulcanizer, and vulcanizing on a flat vulcanizing machine to prepare the composite material sample.

Further, in the step 4, the vulcanization temperature is 170 ℃, and the vulcanization time is 20 min.

Further, the feeding interval time in the step 3 is 1 min.

Compared with the prior art, the rubber for the intelligent manipulator sucker and the preparation method thereof have the beneficial effects that:

(1) the problem of large phase separation degree of graphene whiskers in natural rubber is solved by carrying out surface treatment on the graphene whiskers through a borate coupling agent, the treated graphene has better phase dispersibility, and can be better beneficial to actual production; the surface treatment gypsum whisker is utilized to modify the natural rubber, so that the wear resistance and heat resistance of the product are further improved while the quality of the product is ensured.

(2) The surface modified graphene and gypsum whisker double modified natural rubber has a good filling effect on intermolecular defects of the natural rubber, the rigidity and toughness of the rubber are obviously improved, the product quality of the invention has good stability, and the requirement of the rubber for the intelligent manipulator sucker can be met.

Detailed Description

In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that the term "comprising" in the description and claims of the present application is intended to cover a non-exclusive inclusion, e.g. a method comprising a list of steps is not necessarily limited to those steps explicitly listed, but may include other steps not explicitly listed or inherent to such methods. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.