Wear-resistant, anti-skid and anti-static rubber roller and preparation method thereof

Abstract

The invention relates to the technical field of rubber covered rollers, in particular to a wear-resistant, anti-skid and anti-static rubber covered roller and a preparation method of the wear-resistant, anti-skid and anti-static rubber covered roller. 4-6 parts of zinc oxide; 0.8 to 1.2 parts of stearic acid; 13 to 17 parts of fumed silica; 2-3 parts of an anti-aging agent; 10 to 20 parts of tetrapod-like zinc oxide whisker; 15 to 20 parts of potassium titanate whisker; 10-20 parts of a plasticizer; 0.4 to 0.6 part of paraffin wax; 2-4 parts of a silane coupling agent; 3-5 parts of carbon black; 0.5 to 3 parts of sulfur; 2-4 parts of an accelerant; and 0.1 to 0.5 part of scorch retarder. The wear-resistant anti-slip antistatic rubber roller has the advantages of lasting and stable antistatic performance, excellent anti-slip performance, dynamic stability and remarkably improved wear resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber roller, in particular to a wear-resistant, anti-skid and anti-static rubber roller and a preparation method thereof. BACKGROUND

[0002] The rubber roller is a composite product with metal or other materials as the shaft core and rubber layer as the outer coating. The shaft core provides rigid overall support force, and the outer rubber layer provides flexible elastic ability. The rubber roller is widely used in laminating, traction, flattening, coating and buffering processes in printing, textile, papermaking and plastic processing industries.

[0003] The current situation of the rubber roller is that rubber is a poor conductor of heat and electricity, and heat accumulation and a large amount of static electricity are generated during operation. This problem is particularly prominent and serious when the contacted medium is an insulator. At present, the industry generally uses ion-type antistatic agents to improve the antistatic performance, but such additives will gradually precipitate and lose over time, resulting in rapid decay of the antistatic performance, causing more and more static electricity to be generated and slowly accumulated. When the static electricity accumulates to a certain extent, "static sparks" will directly ignite or break through the contacted material, posing a serious safety hazard. In addition, during the rotation of the rubber roller, friction with the contacted material is inevitable, which will gradually reduce the roughness of the rubber roller during contact, resulting in a decrease in the friction coefficient and a loss of the set use efficiency. The rubber roller user has to frequently replace the rubber roller, causing an increase in production cost and a decrease in production capacity.

[0004] Therefore, it is of important practical significance and economic value to develop a rubber roller with long-lasting antistatic, high wear-resistant and stable anti-skid performance. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a wear-resistant, anti-skid and anti-static rubber roller and a preparation method thereof. The rubber roller realizes long-lasting antistatic, high wear-resistant and dynamic stable anti-skid performance by using a special filler system without using ion-type antistatic agents.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: A wear-resistant, anti-skid and anti-static rubber roller comprises the following components by weight: Nitrile rubber 100 parts; Zinc oxide 4-6 parts; Stearic acid 0.8-1.2 parts; Fumed silica 13-17 parts; Anti-aging agent 2-3 parts; Four acicular zinc oxide whiskers 10-20 parts; Potassium titanate whiskers 15-20 parts; Plasticizer 10-20 parts; Paraffin wax 0.4-0.6 parts; Silane coupling agent 2-4 parts; Carbon black 3-5 parts; Sulfur 0.5-3 parts; Accelerator 2-4 parts; Anti-scorching agent 0.1-0.5 parts.

[0007] Preferably, the silane coupling agent is bis-[gamma-(triethoxysilyl)propyl]tetrasulfide.

[0008] Preferably, the accelerator is a complex system of tetra-benzyl thiuram disulfide and 2,2'-dithiobisbenzothiazole.

[0009] Preferably, the plasticizer is dioctyl terephthalate.

[0010] Preferably, the antioxidant is one or more of antioxidant 4010NA, antioxidant RD or antioxidant 4020.

[0011] Preferably, the anti-scorching agent is N-cyclohexylthiophtalimide.

[0012] The present application also provides a preparation method of the rubber roll, comprising the following steps: S1, batching and plasticizing: each component is weighed according to the above raw material ratio, and the nitrile rubber raw rubber is put into the internal mixer for plasticizing, and the plasticizing is carried out at 50-70℃ for 2-3 minutes.

[0013] S2, mixing: zinc oxide, stearic acid, antioxidant, fumed silica, carbon black, silane coupling agent, tetra acicular zinc oxide whisker, potassium titanate whisker, plasticizer, paraffin wax are added in turn, and the mixing is carried out uniformly, then the rubber is discharged, and the discharge temperature is controlled at 100-110℃.

[0014] S3, parking and filtering: the mixed rubber is parked for not less than 24 hours, the parking temperature is 20-30℃, and the relative humidity is <60%, then the rubber is filtered through a rubber filter (filter screen mesh 80-120 mesh) to remove impurities; S4, vulcanization: the filtered rubber is re-rolled on the open mill (roller temperature 45-55℃), sulfur, accelerator (tetra-benzyl thiuram disulfide and 2,2'-dithiobisbenzothiazole) and anti-scorching agent (N-cyclohexylthiophtalimide) are added, thin pass 5-7 times, knead uniformly, then the rubber is discharged, and the final rubber is obtained; S5, molding and vulcanization: the rubber obtained in step S4 is coated on a metal shaft core coated with a hot vulcanizing adhesive (such as CHEMLOK 205) on a molding machine, a nylon water cloth is coated, and is sent into a vulcanization tank for vulcanization treatment at 150-155℃, 0.4-0.6MPa vulcanization pressure for 6-8 hours; S6, post-processing: after vulcanization is completed, the wrapping cloth is removed, and rough turning, rough grinding and fine grinding are processed to the predetermined size and surface roughness, and the wear-resistant, slip-resistant and antistatic rubber roller is obtained.

[0015] Compared with the prior art, the present application has the following advantages: 1. The antistatic performance is stable and durable: the four-needle-shaped zinc oxide whiskers and potassium titanate whiskers are silanized and modified in the rubber matrix to increase the dispersity and uniformity in the rubber, and the four-needle-shaped zinc oxide whiskers and potassium titanate whiskers are self-antistatic, and are needle-shaped fiber structures, which are easy to form a "bridge" structure and expand the conductive path, thereby reducing the volume resistance of the material, increasing the conductivity, reducing the generation of static electricity, and completely solving the problem of antistatic performance decay caused by the precipitation and loss of ionic antistatic agents.

[0016] 2. Excellent slip resistance and dynamic stability: the hardness of the four-needle-shaped zinc oxide whiskers and potassium titanate whiskers is greater than that of the rubber, which will form a hardness difference with the rubber, and the corresponding high temperature generated during the subsequent processing and grinding of the rubber roller will cause inconsistent expansion speed. When the temperature drops to room temperature, the whisker-shaped material will protrude from the surface of the rubber roller, forming micro "needle protrusions" to increase the friction coefficient and surface roughness, thereby effectively improving the slip resistance. Moreover, due to the different wear indexes of the whisker material and the rubber, the roughness will remain in a dynamic balance state during subsequent use, solving the defect that ordinary rubber rollers become smoother and the roughness becomes lower.

[0017] 3. The wear resistance is significantly improved: the four-needle-shaped zinc oxide whiskers and potassium titanate whiskers as high-performance reinforcing materials greatly improve the mechanical strength, hardness and wear resistance of the rubber material, prolonging the service life of the rubber roller.

[0018] 4. High process feasibility: the selected materials have good compatibility, the preparation process is smooth with the traditional rubber roller production process, no special equipment is needed, and large-scale production is easy to realize. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be clearly and completely described below in combination with specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0020] The present application will be described in detail below through specific embodiments, but the protection scope of the present application is not limited thereto.

[0021] Embodiment 1 A wear-resistant, anti-skid and antistatic rubber roller is prepared by using raw materials in the following proportions by weight: Nitrile rubber (N41) 100 parts; Zinc oxide 5 parts; Stearic acid 1 part; Fumed silica (white carbon black) 15 parts; Antioxidant 4010NA 2 parts; Four acicular zinc oxide whiskers (T-ZnOw) 15 parts; Potassium titanate whisker 18 parts; Dioctyl terephthalate (DOTP) 15 parts; Paraffin wax 0.5 part; Bis-[gamma-(triethoxysil) propyl] tetrasulfide (Si-69) 3 parts; Carbon black (N330) 4 parts; Sulfur 1.5 parts; Tetrabenzyl thiuram disulfide (TBzTD) 1.5 parts; 2,2'-dithiodibenzothiazole (DM) 1.5 parts; N-cyclohexyl thio phthalimide (CTP) 0.3 parts.

[0022] The preparation method of the wear-resistant, anti-skid and antistatic rubber roller is as follows: S1, batching and plasticizing: each component is weighed according to the above raw material ratio, and the nitrile rubber raw rubber is put into the internal mixer for plasticizing, and plasticizing is carried out at 65℃ for 3 minutes.

[0023] S2, mixing: zinc oxide, stearic acid, antioxidant, fumed silica, carbon black, silane coupling agent, four acicular zinc oxide whiskers, potassium titanate whisker, plasticizer and paraffin wax are added in sequence, and the mixing is uniform, then the rubber is discharged, and the discharge temperature is controlled at 105℃.

[0024] S3, parking and filtering: the mixed rubber is parked for not less than 24 hours, the parking temperature is 24℃, and the relative humidity is <60%, and then the rubber is filtered through a rubber filter (filter screen mesh 100 mesh) to remove impurities; S4, vulcanization: the filtered rubber compound is re-rolled on an open mill (roller temperature 50°C), sulfur, accelerators (tetrabenzylthiuram disulfide and 2,2'-dithiodibenzo thiazole) and anti-scorching agent (N-cyclohexyl thio phthalimide) are added, and the rubber compound is thin passed 5-7 times and then milled uniformly before being sheeted to obtain the final rubber compound; S5, molding and vulcanization: the rubber compound obtained in step S4 is coated on a metal shaft core coated with a hot vulcanizing adhesive (such as CHEMLOK 205) on a molding machine, a nylon water cloth is coated, and the rubber compound is sent into a vulcanization tank for vulcanization treatment at 150°C and 0.5 MPa vulcanization pressure for 7 hours; S6, post-treatment: after vulcanization is completed, the coating cloth is removed, and the rubber compound is processed to the predetermined size and surface roughness through rough turning, rough grinding and fine grinding to obtain the wear-resistant, slip-resistant and anti-static rubber roller.

[0025] Comparative Example 1 The same raw material ratio and preparation method as in Example 1 are used, but no tetrapod-shaped zinc oxide whiskers and potassium titanate whiskers are added, and the corresponding portions are supplemented with an equal amount of fumed silica.

[0026] Comparative Example 2 The same raw material ratio and preparation method as in Example 1 are used, but the tetrapod-shaped zinc oxide whiskers and potassium titanate whiskers are replaced with an equal amount of ordinary ionic antistatic agent (quaternary ammonium salt).

[0027] Performance Test The rubber rollers obtained in Example 1 and Comparative Examples 1 and 2 are tested for performance, and the relevant test methods refer to the national standards of the rubber industry, and the results are shown in the following table: *Note: Dynamic roughness retention rate: after 100,000 times of friction under simulated working conditions, the percentage of surface roughness relative to the initial value.

[0028] As shown in the above table, the rubber roller prepared by the present application (Example 1) is far superior to Comparative Example 1 which does not use functional whiskers in terms of antistatic property, wear resistance (wear amount is significantly reduced), and friction coefficient. Compared with Comparative Example 2 which uses a traditional ionic antistatic agent, the antistatic performance of the rubber roller of the present application is durable and stable without attenuation, and the mechanical strength, wear resistance and slip resistance are better.

[0029] The above description is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed by the present application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the present application.

Claims

1. A wear resistant, slip resistant, antistatic rubber roll characterized in that, The raw materials include the following components by weight: Nitrile rubber 100 parts; Zinc oxide 4-6 parts; Stearic acid 0.8-1.2 parts; Fumed silica 13-17 parts; Antioxidant 2-3 parts; Four acicular zinc oxide whiskers 10-20 parts; Potassium titanate whiskers 15-20 parts; Plasticizer 10-20 parts; Paraffin wax 0.4-0.6 parts; Silane coupling agent 2-4 parts; Carbon black 3-5 parts; Sulfur 0.5-3 parts; Accelerator 2-4 parts; Anti-scorching agent 0.1-0.5 parts.

2. The anti-static, anti-slip, and anti-abrasion rubber roller according to claim 1, wherein, The silane coupling agent is bis-[γ-(triethoxysil)propyl]tetrasulfide.

3. The anti-static, anti-slip, and anti-abrasion rubber roller according to claim 1, wherein, The accelerator includes tetrabenzylthiuram disulfide and 2,2'-dithiodibenzo-thiazole, and the weight parts of tetrabenzylthiuram disulfide is 1-2 parts and the weight parts of 2,2'-dithiodibenzo-thiazole is 1-2 parts.

4. The anti-static, anti-slip, and anti-abrasion rubber roller according to claim 1, wherein, The plasticizer is dioctyl terephthalate.

5. The anti-static, anti-slip, and anti-abrasion rubber roller according to claim 1, wherein, The antioxidant is one or several of antioxidant 4010NA, antioxidant RD or antioxidant 4020.

6. The anti-static, anti-slip, and anti-abrasion rubber roller according to claim 1, wherein, The anti-scorching agent is N-cyclohexylthiophtalimide.

7. A process for the preparation of the anti-static, anti-slip, anti-abrasion rubber roll as claimed in any one of claims 1 to 6, wherein, The method includes the following steps: S1, batching and plasticizing: each component is weighed according to the raw material ratio, and the nitrile rubber raw rubber is put into the internal mixer for plasticizing; S2, mixing: zinc oxide, stearic acid, antioxidant, fumed silica, carbon black, silane coupling agent, four acicular zinc oxide whiskers, potassium titanate whiskers, plasticizer, paraffin wax are added in sequence, and the mixture is uniformly mixed and then discharged; S3, parking and filtering: the mixed rubber is parked for not less than 24 hours, and then filtered through a rubber filter; S4, vulcanization: the filtered rubber is re-input into the open mill, sulfur, accelerator and anti-scorching agent are added, and the rubber is uniformly thin-passed and kneaded, then discharged to obtain the final rubber; S5, molding and vulcanization: the rubber obtained in step S4 is coated on the metal shaft core which has been brushed with hot vulcanizing adhesive on the molding machine, and nylon water cloth is coated, and then sent into the vulcanization tank for vulcanization treatment; S6, post-treatment: after vulcanization, the wrapping cloth is removed, and the rough turning, rough grinding and fine grinding are processed to the predetermined size and surface roughness, thereby obtaining the wear-resistant, anti-skid and anti-static rubber roller.

8. The method of claim 7, wherein the anti-static rubber roll is prepared by mixing the anti-static rubber composition with a rubber roll, and then curing the rubber roll. The parking temperature in step S3 is 20-30℃, and the relative humidity is <60%.

9. The method of claim 7, wherein the anti-static rubber roll is prepared by mixing the anti-static rubber composition with a rubber roll. The roller temperature of the open mill in step S4 is controlled at 45-55℃.

10. The method of claim 7, wherein the anti-static rubber roll is prepared by mixing the anti-static rubber composition with a rubber roll. The vulcanization treatment in step S5 is carried out at 150-155℃ and 0.4-0.6MPa vulcanization pressure for 6-8 hours.

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