阅读说明：本技术 一种超耐磨抗撕裂输送带覆盖胶及其制备方法 (Super-wear-resistant tear-resistant conveyor belt covering rubber and preparation method thereof ) 是由 孟阳 陈希 张晨启 陈旭芳 赵伟君 王颖 范旭梦 曲成东 于 2019-10-12 设计创作，主要内容包括：本发明涉及一种超耐磨抗撕裂输送带覆盖胶及其制备方法,属于输送带技术领域。其包括天然橡胶20-60份；顺丁橡胶20-70份；丁苯橡胶0-30份；结晶性高分子材料2-15份；不饱和金属盐2-10份；纳米粘土母胶10-20份；纤维1-5份；补强剂45-70份；硫化剂0.5-3份。经过一段混炼、二段混炼和硫化后制备得到超耐磨抗撕裂输送带覆盖胶。本发明所述的输送带覆盖胶具有优异的耐磨性、抗撕裂性能；与传统材料相比,具有更高的预期使用寿命,可广泛应用于工况复杂的输送带产品中,并可拓展到轮胎、传动带等领域,具有较强的推广和应用价值。(The invention relates to an ultra-wear-resistant tear-resistant conveyor belt covering rubber and a preparation method thereof, and belongs to the technical field of conveyor belts. It comprises 20-60 parts of natural rubber; 20-70 parts of butadiene rubber; 0-30 parts of styrene butadiene rubber; 2-15 parts of crystalline high polymer material; 2-10 parts of unsaturated metal salt; 10-20 parts of nano clay masterbatch; 1-5 parts of fiber; 45-70 parts of reinforcing agent; 0.5-3 parts of vulcanizing agent. The super wear-resistant tear-resistant conveyor belt covering rubber is prepared after first-stage mixing, second-stage mixing and vulcanization. The conveyor belt covering rubber disclosed by the invention has excellent wear resistance and tear resistance; compared with the traditional material, the material has longer expected service life, can be widely applied to conveyer belt products with complex working conditions, can be expanded to the fields of tires, transmission belts and the like, and has higher popularization and application values.)

1. The super wear-resistant tear-resistant conveyor belt covering rubber is characterized by comprising the following components in parts by weight: 20-60 parts of natural rubber; 20-70 parts of butadiene rubber; 0-30 parts of styrene butadiene rubber; 2-15 parts of crystalline high polymer material; 2-10 parts of unsaturated metal salt; 10-20 parts of nano clay masterbatch; 1-5 parts of fiber; 45-70 parts of reinforcing agent; 0.5-3 parts of a vulcanizing agent; the super wear-resistant tear-resistant conveyor belt covering rubber is prepared after first-stage mixing, second-stage mixing and vulcanization.

2. The super abrasion-resistant tear-resistant conveyor belt cover rubber according to claim 1, wherein: the crystalline polymer material is one or more of polyurethane, ultrahigh molecular weight polyethylene, synthetic trans-isoprene or gutta-percha.

3. The super abrasion-resistant tear-resistant conveyor belt cover rubber according to claim 1, wherein: the unsaturated metal salt comprises unsaturated carboxylic acid groups and metal ions in the structure; the unsaturated carboxylic acid group is an acrylic acid group or a methacrylic acid group, and the metal ion is zinc ion or magnesium ion.

4. The super abrasion-resistant tear-resistant conveyor belt cover rubber according to claim 1, wherein: the nano-clay master batch comprises natural rubber and clay, wherein the clay accounts for 5-10% of the total weight of the nano-clay master batch; the clay is specifically montmorillonite and/or rectorite.

5. The super abrasion-resistant tear-resistant conveyor belt cover rubber according to claim 1, wherein: the fiber is specifically one or more of glass fiber, aramid fiber and nylon fiber.

6. The super abrasion-resistant tear-resistant conveyor belt cover rubber according to claim 1, wherein: the reinforcing agent is one or more of white carbon black, carbon black N110, carbon black N220, carbon black N234, carbon black N330 and carbon black N550.

7. The super abrasion-resistant tear-resistant conveyor belt cover rubber according to claim 1, wherein: the vulcanizing agent is one or more of sulfur, dicumyl peroxide and bis 2, 5.

8. The preparation method of the super wear-resistant tear-resistant conveyer belt covering rubber is characterized by comprising the following steps of:

(1) first-stage mixing: adding natural rubber, butadiene styrene rubber and butadiene rubber into an internal mixer, and carrying out internal mixing for 1-2 min; adding 2/3 total weight of reinforcing agent, crystalline polymer material, unsaturated metal salt, nano clay masterbatch and fiber, controlling the temperature within the range of 100-150 ℃, and banburying for 3-8 min; then adding the rest reinforcing agent, controlling the temperature within the range of 100-;

(2) and (3) second-stage mixing: putting the first-stage rubber compound prepared in the step (1) into an internal mixer or an open mill, adding a vulcanizing agent, controlling the temperature below 80 ℃, mixing for 3-5min, and then discharging rubber sheets to obtain a covering rubber sheet;

(3) and (3) vulcanization: and (3) standing the cover rubber sheet obtained in the step (2) for 16-24h, and then forming and vulcanizing to obtain the conveyor belt cover rubber vulcanized rubber.

9. The method for preparing the super abrasion-resistant tear-resistant conveyer belt covering rubber according to claim 8, wherein: the crystalline polymer material is in the form of granular powder or blocks obtained by crushing.

Technical Field

The invention relates to an ultra-wear-resistant tear-resistant conveyor belt covering rubber and a preparation method thereof, and the prepared product has excellent wear resistance and tear resistance and longer expected service life, can be widely applied to conveyor belt products with complex application working conditions, and belongs to the technical field of conveyor belts.

Background

The conveying belt is a large composite material part consisting of a rubber covering rubber material, a framework material and an interface bonding material, is widely applied to material transportation in the fields of mining, steel smelting, building material cement, ports and docks, thermal power generation and the like, and has an important supporting effect on the development of important national economy. The operation condition of the conveying belt is complex and harsh, so that the conveying belt is contacted and rubbed with a carrier roller and materials of the conveyor for a long time under the action of the materials in the operation process, the covering rubber of the conveying belt is abraded and falls off, the maintenance is frequent, and the service life is short. Meanwhile, at the positions of a blanking port and the like, materials fall from a high position, and the conveyer belt is easily torn under the impact of sharp materials, so that the conveyer belt is damaged, the service life is prolonged, the operation cost is increased, the production efficiency of customers is seriously influenced, and great economic loss is caused.

Improving the wear resistance and tear resistance of the conveyor belt covering is an important direction for prolonging the service life of the conveyor belt, and is also a key point of long-term research in the field. In the previous researches, on one hand, wear resistance of the conveyer belt is improved by embedding wear-resistant pieces on the surface of the material by a structural design method, such as patent technologies CN201721340039.3, CN201721503177.9, and the like. The technology needs to add an abrasion-resistant sheet embedding procedure in the product manufacturing process, the process is complicated, the risk of separation of the abrasion-resistant sheet from the rubber material due to interface adhesion exists in long-term use of the product, and the technology cannot give consideration to the tear resistance of the material. On the other hand, through material formula design, novel wear-resistant covering rubber materials are developed, such as patent technologies of CN200510035572.4, CN201510163937.5, CN201510787462.7, CN201410539024.4 and the like. However, the abrasion resistance value of the conveyer belt covering rubber material obtained by the related technology is still higher, and meanwhile, the tear resistance of the material is less considered. The wear resistance and tear resistance of the material are further improved, and the material has important significance for prolonging the service life of a conveyer belt product for material transportation under severe working conditions.

Disclosure of Invention

The invention aims to provide an ultra-wear-resistant tear-resistant conveyor belt covering rubber and a preparation method thereof, and solves the problems that a conveyor belt is seriously worn and easily torn in the process of transporting materials under severe working conditions. According to the invention, through formula design and new material application, crystalline high-molecular new material, unsaturated metal salt, nano-clay masterbatch, fiber and other materials are introduced into rubber, and through process adjustment, good dispersion of various materials in the rubber is realized, and the conveying belt covering rubber material with excellent wear resistance and tear resistance is prepared, so that the wear and impact damage of the conveying belt by the materials are greatly reduced, the service life of the conveying belt is prolonged, and the material cost in the material transportation process is effectively reduced.

According to the technical scheme, the super wear-resistant tear-resistant conveyor belt covering rubber comprises the following components in parts by weight: 20-60 parts of natural rubber; 20-70 parts of butadiene rubber; 0-30 parts of styrene butadiene rubber; 2-15 parts of crystalline high polymer material; 2-10 parts of unsaturated metal salt; 10-20 parts of nano clay masterbatch; 1-5 parts of fiber; 45-70 parts of reinforcing agent; 0.5-3 parts of vulcanizing agent.

The crystalline high polymer material is one or more of polyurethane, ultrahigh molecular weight polyethylene, synthetic trans-isoprene rubber or gutta-percha. The material is granular, powdery or crushed into blocks, and is convenient to blend with rubber materials. The material has excellent wear resistance, and can effectively improve the wear resistance of the rubber material after being added into the rubber material and being co-crosslinked with the rubber material in the vulcanization process.

The unsaturated metal salt structure comprises unsaturated carboxylic acid groups and metal ions, wherein the unsaturated carboxylic acid groups are acrylic acid groups or methacrylic acid groups, and the metal ions are zinc ions or magnesium ions. By adding the unsaturated metal salt, an ionic crosslinking structure is constructed in the rubber, the mechanical property of the material is improved, the elongation at break of the material is properly improved, and the problem that the elongation at break of the rubber is reduced due to the addition of other materials such as clay masterbatch, fibers and the like in the technology is solved.

The nano-clay master batch comprises natural rubber and clay, wherein the clay comprises one or two of montmorillonite or rectorite, and the clay accounts for 5-10% of the total weight of the master batch. The nano-clay masterbatch is selected, so that the problem that the nano-clay is not easy to disperse when being directly added is solved, and the material mixing efficiency is improved.

The fiber comprises one or more of glass fiber, aramid fiber and nylon fiber. A small amount of fiber materials are introduced into the material, so that the tearing performance of the material is effectively improved. The fiber material and the nano clay sheet material are synergistic, so that the crack propagation of the material is effectively hindered, and the tear resistance of the material is greatly improved.

The reinforcing agent comprises one or more of white carbon black, carbon black N110, carbon black N220, carbon black N234, carbon black N330 and carbon black N550.

The vulcanizing agent is one or more of sulfur, dicumyl peroxide and bis 2, 5.

A preparation method of super wear-resistant tear-resistant conveyer belt covering rubber comprises the following steps:

(1) first-stage mixing: adding natural rubber, butadiene styrene rubber and butadiene rubber into an internal mixer, and carrying out internal mixing for 1-2 min; adding 2/3 total weight of reinforcing agent, crystalline polymer material, unsaturated metal salt, nano clay masterbatch and fiber, controlling the temperature within the range of 100-150 ℃, and banburying for 3-8 min; then adding the rest reinforcing agent, controlling the temperature within the range of 100-;

(2) and (3) second-stage mixing: putting the first-stage rubber compound prepared in the step (1) into an internal mixer or an open mill, adding a vulcanizing agent, controlling the temperature below 80 ℃, mixing for 3-5min, and then discharging rubber sheets to obtain a covering rubber sheet;

(3) and (3) vulcanization: and (3) standing the cover rubber sheet obtained in the step (2) for 16-24h, and then forming and vulcanizing to obtain the conveyor belt cover rubber vulcanized rubber.

The crystalline polymer material is in the form of granular powder or blocks obtained by crushing.

Through the control of the feeding sequence, the temperature and the mixing time in the preparation method, the good dispersion of various materials in the rubber is realized, and the materials exert the best performance.

Compared with the prior art, the invention has the characteristics and advantages that:

(1) in the rubber material, crystalline macromolecules with excellent wear resistance are innovatively introduced, and materials such as nano-clay masterbatch, unsaturated metal salt, fiber material, white carbon black and carbon black are matched, and the type and the dosage of a proper vulcanizing agent are controlled, so that a covering rubber material with excellent wear resistance and tear resistance is developed;

(2) the developed material has simple preparation process, and the product preparation requirement of the technology can be met by carrying out process fine adjustment in the existing conveyer belt equipment;

(3) the developed covering rubber material can obviously prolong the service life of the conveying belt and effectively reduce the material cost in the material conveying process.

Drawings

FIG. 1 is a transmission electron micrograph of the nanoclay in the rubber coating in example 1.

Fig. 2 is a photograph showing crack growth in the samples prepared in example 1 and comparative example 1.

Detailed Description