阅读说明：本技术 一种耐氧化天然混炼胶及其制备方法 (Oxidation-resistant natural rubber compound and preparation method thereof ) 是由 朱树生 孙雯雯 于 2020-07-01 设计创作，主要内容包括：本发明公开了一种耐氧化天然混炼胶及其制备方法,属于天然橡胶领域,其技术方案要点是一种耐氧化天然混炼胶,包括以下重量组分的原料：天然胶100份、炭黑40-60份、环烷油3-6份、氧化锌3-6份、硬脂酸1-3份、防护蜡3-5份、防老剂1-3份、促进剂1-3份、硫磺2-5份、防焦剂CTP 1-3份、功能化石墨烯FEG 1-5份。本发明在天然橡胶的制备过程中添加抗氧化剂,提高制得的橡胶的耐氧化效果,从而提升天然橡胶制品在接触空气的情况下的使用寿命。(The invention discloses an oxidation-resistant natural rubber compound and a preparation method thereof, belonging to the field of natural rubber, and the key point of the technical scheme is that the oxidation-resistant natural rubber compound comprises the following raw materials by weight: 100 parts of natural rubber, 40-60 parts of carbon black, 3-6 parts of naphthenic oil, 3-6 parts of zinc oxide, 1-3 parts of stearic acid, 3-5 parts of protective wax, 1-3 parts of anti-aging agent, 1-3 parts of accelerator, 2-5 parts of sulfur, 1-3 parts of antiscorching agent CTP and 1-5 parts of functionalized graphene FEG. According to the invention, the antioxidant is added in the preparation process of the natural rubber, so that the oxidation resistance effect of the prepared rubber is improved, and the service life of the natural rubber product is prolonged under the condition of contacting with air.)

1. An oxidation-resistant natural rubber compound is characterized by comprising the following raw materials in parts by weight: 100 parts of natural rubber, 40-60 parts of carbon black, 3-6 parts of naphthenic oil, 3-6 parts of zinc oxide, 1-3 parts of stearic acid, 3-5 parts of protective wax, 1-3 parts of anti-aging agent, 1-3 parts of accelerator, 2-5 parts of sulfur, 1-3 parts of antiscorching agent CTP and 1-5 parts of functionalized graphene FEG.

2. An oxidation-resistant natural mix as claimed in claim 1, characterized in that: the functionalized graphene FEG is prepared by grafting tert-butyl-6-acrylic acid-4-methyl p-methyl methacrylate onto graphene through a coupling agent.

3. An oxidation-resistant natural mix as claimed in claim 2, characterized in that: the coupling agent is one of KH580 or KH 590.

4. An oxidation-resistant natural mix as claimed in claim 1, characterized in that: the carbon black comprises one of carbon black N550 or carbon black N774 or a mixture of the two.

5. An oxidation-resistant natural mix as claimed in claim 1, characterized in that: the protective wax is one or a mixture of protective wax 654 or protective wax 9344.

6. An oxidation-resistant natural mix as claimed in claim 1, characterized in that: the anti-aging agent is one or a mixture of anti-aging agent 3100 and anti-aging agent 4020.

7. A method of preparing an oxidation resistant natural rubber mix according to claim 1, comprising the steps of:

step S1: preparing a coupling agent solution, mixing the coupling agent solution with a graphene oxide solution, reacting for 6-8 hours at 90-95 ℃ under the condition of air isolation to obtain an intermediate product, and grafting tert-butyl-6-acrylic acid-4-methyl-p-methyl methacrylate onto graphene oxide according to the mass ratio of tert-butyl-6-acrylic acid-4-methyl-p-methyl methacrylate to graphene oxide of 1:1 to obtain functionalized graphene FEG for later use;

step S2: adding a dispersing agent to ultrasonically disperse the functionalized graphene FEG prepared in the step S1 in water to prepare a suspension, weighing natural rubber according to the mass ratio of 1:100, adding the natural rubber into the suspension, adding a calcium chloride solution to demulsify, filtering and flushing to prepare a composite natural rubber;

step S3: setting a roller spacing of 0.5-1.5mm, plasticizing the composite natural rubber, standing for 30-40min, kneading the composite natural rubber, sequentially adding 40-60 parts of carbon black, 3-6 parts of naphthenic oil, 3-6 parts of zinc oxide, 1-3 parts of stearic acid, 3-5 parts of protective wax, 1-3 parts of an anti-aging agent, 1-3 parts of an accelerator and 1-3 parts of an anti-scorching agent CTP, and discharging rubber at the temperature of 110-;

step S4: adding the rubber compound into an open mill, adding 2-5 parts of sulfur, cutting for 5-8 times by a left cutter and a right cutter, beating for 7-10 times by a thin-pass triangular bag, and exhausting and discharging;

step S5: and (4) vulcanizing the mixed rubber processed in the step S4 to obtain a vulcanized rubber material.

Technical Field

The invention relates to the field of natural rubber, and particularly relates to an oxidation-resistant natural rubber compound and a preparation method thereof.

Background

Natural rubber is a natural polymer compound, the main component of which is generally a polyolefin, and which contains other organic substances such as proteins, saccharides, and the like, and has been used for various articles for daily use and industry because of its excellent flexibility, strength, and electrical insulation properties. In addition, because the natural rubber has great elasticity, the natural rubber can be used for manufacturing different types of automobile articles, such as automobile tires, special adhesive tapes for agricultural machinery and the like.

As a non-synthetic elastomer, natural rubber is widely used in the production of industrial belts such as hexagonal belts and narrow V belts, rubber tracks such as engineering machine tracks and agricultural machine tracks, and various cut V belts. However, because the molecular structure of natural rubber contains unsaturated double bonds and active allyl hydrogen, the natural rubber and products thereof inevitably have polymer breakage and oxygen-containing groups during processing and use, seriously damage the physical and mechanical properties of the products and even lose the use value. Therefore, the ozone resistance effect of the natural rubber product is improved, and the ozone resistance effect has important significance for prolonging the service life of the natural rubber product in the process of contacting air.

Disclosure of Invention

The invention aims to provide an anti-oxidation natural rubber compound and a preparation method thereof.

The technical purpose of the invention is realized by the following technical scheme:

an oxidation-resistant natural rubber compound comprises the following raw materials in parts by weight: 100 parts of natural rubber, 40-60 parts of carbon black, 3-6 parts of naphthenic oil, 3-6 parts of zinc oxide, 1-3 parts of stearic acid, 3-5 parts of protective wax, 1-3 parts of an anti-aging agent, 1-3 parts of an accelerator, 2-5 parts of sulfur, 1-3 parts of an anti-scorching agent CTP, and 1-5 parts of functionalized graphene FEG.

Further, the functionalized graphene FEG is prepared by grafting tert-butyl-6-acrylic acid-4-methyl p-methyl methacrylate onto graphene through a coupling agent.

Further, the coupling agent is one of KH580 or KH 590.

Further, the carbon black comprises one or a mixture of carbon black N550 or carbon black N774.

Further, the protective wax is one of or a mixture of protective wax 654 or protective wax 9344.

Further, the anti-aging agent is one or a mixture of anti-aging agent 3100 and anti-aging agent 4020.

Further, the preparation method of the oxidation-resistant natural rubber compound comprises the following steps:

step S1: preparing a coupling agent solution, mixing the coupling agent solution with a graphene oxide solution, reacting for 6-8h at 90-95 ℃ under the condition of air isolation to obtain an intermediate product, and grafting tert-butyl-6-acrylic acid-4-methyl-p-methyl methacrylate onto graphene oxide according to the mass ratio of tert-butyl-6-acrylic acid-4-methyl-p-methyl methacrylate to graphene oxide of 1:1 to obtain functionalized graphene FEG for later use;

step S2: adding a dispersing agent to ultrasonically disperse the functional graphene FEG prepared in the step S1 in water to prepare a suspension, weighing natural rubber according to the mass ratio of 1:100, adding the natural rubber into the suspension, adding a calcium chloride solution to demulsify, filtering and washing to prepare a composite natural rubber;

step S3: setting a roller spacing of 0.5-1.5mm, plasticizing the composite natural rubber, standing for 30-40min, kneading the composite natural rubber, sequentially adding 40-60 parts of carbon black, 3-6 parts of naphthenic oil, 3-6 parts of zinc oxide, 1-3 parts of stearic acid, 3-5 parts of protective wax, 1-3 parts of an anti-aging agent, 1-3 parts of a promoter and 1-3 parts of an anti-scorching agent, and discharging rubber at the temperature of 110-120 ℃ to obtain a rubber compound;

step S4: adding the rubber compound into an open mill, adding 2-5 parts of sulfur, cutting for 5-8 times by a left cutter and a right cutter, beating for 7-10 times by a thin-pass triangular bag, and exhausting and discharging;

step S5: and vulcanizing the mixed rubber processed in the step S4 to obtain a vulcanized rubber material.

In conclusion, the invention has the following beneficial effects:

1. the functional graphene FEG is added into the rubber, and more curved surfaces appear on the surface of molecules of the functional graphene FEG compared with graphene oxide, so that the functional graphene FEG is doped into natural rubber, on one hand, oxygen is prevented from entering the functional graphene FEG by a lamella in the functional graphene FEG, on the other hand, the hindered phenol group and the thioether bond are synergistically antioxidant, and the antioxidant effect of the prepared rubber is further improved.

2. The functionalized graphene FEG is mixed with the natural rubber by an emulsion mixing method, so that the dispersion uniformity of the functionalized graphene FEG in the natural rubber is improved, and the thermal stability of the prepared rubber product is improved.

Detailed Description