CN112409659A - Food-grade heat-resistant wear-resistant conveyor belt covering rubber and preparation method thereof - Google Patents
Food-grade heat-resistant wear-resistant conveyor belt covering rubber and preparation method thereof Download PDFInfo
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 30
- 239000005060 rubber Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000006229 carbon black Substances 0.000 claims description 19
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 13
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000011787 zinc oxide Substances 0.000 claims description 9
- 229920003049 isoprene rubber Polymers 0.000 claims description 8
- 239000004200 microcrystalline wax Substances 0.000 claims description 8
- 235000019808 microcrystalline wax Nutrition 0.000 claims description 8
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 claims description 8
- 235000021355 Stearic acid Nutrition 0.000 claims description 7
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 7
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 7
- 239000003549 soybean oil Substances 0.000 claims description 7
- 235000012424 soybean oil Nutrition 0.000 claims description 7
- 239000008117 stearic acid Substances 0.000 claims description 7
- 230000003712 anti-aging effect Effects 0.000 claims description 6
- 239000003963 antioxidant agent Substances 0.000 claims description 6
- 230000003078 antioxidant effect Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 235000013305 food Nutrition 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000002174 Styrene-butadiene Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 3
- 239000003292 glue Substances 0.000 claims 1
- 150000003839 salts Chemical class 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract 1
- 235000002639 sodium chloride Nutrition 0.000 description 20
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 18
- 239000000243 solution Substances 0.000 description 12
- 230000032683 aging Effects 0.000 description 11
- 238000005299 abrasion Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 229910001385 heavy metal Inorganic materials 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 244000043261 Hevea brasiliensis Species 0.000 description 4
- 229920003052 natural elastomer Polymers 0.000 description 4
- 229920001194 natural rubber Polymers 0.000 description 4
- 231100000252 nontoxic Toxicity 0.000 description 4
- 230000003000 nontoxic effect Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000012286 potassium permanganate Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003223 protective agent Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 230000009967 tasteless effect Effects 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 235000021588 free fatty acids Nutrition 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229960002447 thiram Drugs 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Belt Conveyors (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses food-grade heat-resistant wear-resistant conveyor belt covering rubber, which provides a raw material ratio and discloses a preparation method of the food-grade heat-resistant wear-resistant conveyor belt covering rubber based on the raw material ratio. According to the food-grade heat-resistant wear-resistant conveyor belt cover rubber and the preparation method thereof, during material selection, the formula performance is considered to meet the index requirement, and the cover rubber is matched with a conveyor belt framework material, frictioning or rubberizing, so that the prepared cover rubber meets the sanitary requirement, also meets the heat-resistant wear-resistant requirement, meets the production and use requirements of edible salt, improves the quality of a conveyor belt, and prolongs the service life of the adhesive belt.
Description
Technical Field
The invention belongs to the technical field of conveying belts, and particularly relates to food-grade heat-resistant wear-resistant conveying belt covering rubber and a preparation method thereof.
Background
The edible salt is a necessity of daily life of people, is prepared by refining seawater, underground brine, salt lake brine, sea salt, rock salt, lake salt and the like, and a large amount of conveying belts are used in the production process, so that corresponding requirements are provided for the preparation of the conveying belt covering rubber.
The edible salt is definitely required by the current national standard GB/T5461, so that the edible salt does not contain obvious foreign matters irrelevant to salt, and the heavy metal content is strictly controlled and the highest content standard is definitely specified.
Therefore, the edible salt production enterprises strictly control each production link, especially focus on the pollution of the conveying belt in the edible salt process, and find that most of the rubber powder falling off due to the abrasion of the conveying belt enters the conveyed edible salt. Meanwhile, the edible salt needs to be dried in the production process, and the drying temperature is normally controlled at 110 ℃ of 100-.
From the above production process, it can be seen that the conveyer belt used for edible salt production must satisfy at least three of the following conditions:
(1) the food hygiene standard is met, and particularly the heavy metal content needs to be strictly controlled;
(2) the used conveying belt can work for a long time under the condition of 100 ℃;
(3) the conveyer belt is very wear-resistant in the use process, and the falling rubber powder is very little.
The conveying belts produced by the existing adhesive tape production enterprises are produced according to the national standard or the industrial standard organization, most of the conveying belts only meet the condition, and difficulty is brought to purchasing of the salt production enterprises.
Disclosure of Invention
The invention aims to provide food-grade heat-resistant wear-resistant conveyor belt cover rubber and a preparation method thereof.
In order to achieve the above purpose, the solution of the invention is:
a food-grade heat-resistant wear-resistant conveyor belt covering rubber comprises the following raw materials in percentage by mass:
isoprene rubber: 30-40 parts of;
styrene-butadiene rubber: 60-70 parts of;
sublimating sulfur: 0.2 to 0.3;
accelerator TMTD: 2.0-2.5;
zinc oxide: 4-6;
stearic acid: 1.2-1.8;
anti-aging agent RD: 1.2-2.0;
anti-aging agent AW: 1.0-1.5;
microcrystalline wax: 0.6-1.0;
n115 carbon Black: 10-15 parts of;
n234 carbon Black: 15-25;
n220 carbon Black: 20-35;
edible soybean oil: 1.0-3.0.
The styrene-butadiene rubber adopts SBR 1500E.
The sublimed sulfur is 600 mesh sublimed sulfur.
The zinc oxide is produced by an indirect method, and is subjected to secondary calcination to obtain a product with the content of more than or equal to 99.9 percent.
The preparation method of the food-grade heat-resistant wear-resistant conveyor belt covering rubber comprises the following steps:
step 1, weighing 30-40 parts of isoprene rubber and 60-70 parts of styrene butadiene rubber according to the mass ratio, and putting into an internal mixer for plastication for 38-42 seconds;
step 2, adding 4-6 parts by mass of zinc oxide, 1.2-1.8 parts by mass of stearic acid, 1.2-2.0 parts by mass of antioxidant RD, 1.0-1.5 parts by mass of antioxidant AW and 0.6-1.0 parts by mass of microcrystalline wax, and mixing for 55-65 seconds;
step 3, adding the raw materials according to the mass ratio of 10-15 parts of N115 carbon black, 15-25 parts of N234 carbon black and 20-35 parts of N220 carbon black, and mixing at the temperature of 130-140 ℃ for 120-125 seconds;
step 4, adding edible soybean oil with the mass ratio of 1.0-3.0, mixing for 30-35 seconds, taking out pieces and cooling to obtain a rubber material;
step 5, after standing for more than 8 hours, putting the rubber material obtained in the step 4 into internal mixing again for mixing for 35-40 seconds, and controlling the temperature to be 80-90 ℃;
and 6, adding 0.2-0.3 mass percent of sublimed sulfur and 2.0-2.5 mass percent of promoter TMTD, mixing for 30-35 seconds, taking out, and cooling for later use.
After adopting the scheme, the invention has the following characteristics:
(1) the material for preparing the covering rubber not only meets the sanitary requirement, but also meets the heat-resistant and wear-resistant requirements, so that the production and use requirements of edible salt can be met;
(2) when the material selection of the covering rubber is researched and designed, the matching between the formula performance and the framework material of the conveying belt, the frictioning or the rubberizing is considered, the quality of the conveying belt is improved, and the service life of the rubber belt is prolonged.
Drawings
FIG. 1 is a diagram of a manufacturing process of the present invention.
Detailed Description
Through statistics on the conditions of edible salt production enterprises for many years, the following parameters are obtained for the conveying belts required to be used by the edible salt production enterprises:
first, the sanitary requirement (GB2762 and GB2760 standard requirements)
Evaporation residue of 4% acetic acid soak solution is less than or equal to 1000mg/L
The evaporation residue of n-ethane soak solution is less than or equal to 2000mg/L
The potassium permanganate consumption of the water soak solution is less than or equal to 70mg/L
Heavy metal (calculated as Pb) 4% acetic acid soak solution is less than or equal to 1mg/L
Second, heat-resisting requirement (GB/T20021 canvas core heat-resisting conveyer belt T1 type)
After the sample is aged for 7 days at 100 DEG C
The lowest value of the strength is more than or equal to 12MPa
The strength is changed by less than or equal to 25 percent compared with the strength before aging
The lowest elongation at break is more than or equal to 200 percent
The elongation at break is less than or equal to 50 percent compared with the change before aging
Maximum hardness not more than 85IRHD
The hardness change before aging is less than or equal to 20IRHD
Third, the requirement of wear resistance
At present, the wear resistance of a conveying belt at normal temperature is roughly classified into three grades:
the abrasion loss of the common type is less than or equal to 200mm3
The medium wear-resistant abrasion loss is less than or equal to 120mm3
Wear-resisting abrasion loss is less than or equal to 100mm3
In order to ensure that the edible salt is not polluted, the abrasion loss is determined to be less than or equal to 70mm on the basis of comparing the use effects for a plurality of times3
Fourth, the adhesive property with the framework layer of the common conveyer belt
The bonding strength of the common EP canvas rubberizing is more than or equal to 8N/mm
In conclusion, the performance indexes of the food-grade heat-resistant wear-resistant conveyer belt covering rubber are determined as follows:
evaporation residue of 4% acetic acid soak solution is less than or equal to 1000mg/L
The evaporation residue of n-ethane soak solution is less than or equal to 2000mg/L
The potassium permanganate consumption of the water soak solution is less than or equal to 70mg/L
Heavy metal (calculated as Pb) 4% acetic acid soak solution is less than or equal to 1mg/L
After the sample is aged for 7 days at 100 DEG C
The lowest value of the strength is more than or equal to 12MPa
The strength is changed by less than or equal to 25 percent compared with the strength before aging
The lowest elongation at break is more than or equal to 200 percent
The elongation at break is less than or equal to 50 percent compared with the change before aging
Maximum hardness not more than 85IRHD
The hardness change before aging is less than or equal to 20IRHD
At normal temperature:
abrasion loss is less than or equal to 70mm3
The bonding strength of the common EP canvas rubberizing is more than or equal to 8N/mm
In order to achieve the above purpose, the raw and auxiliary materials are screened, and a proper material is selected for testing, so as to determine the final application formula as follows:
1. isoprene rubber is similar to natural rubber, but is purer and has lower impurity content than natural rubber. The material can work for a long time at the temperature of 100 ℃, has excellent wear resistance after optimized matching, has excellent adhesive property with a framework layer of a conveyer belt, and is an excellent material.
2. The styrene butadiene rubber has excellent heat resistance, can work for a long time at 120 ℃, and has excellent wear resistance and other properties, wherein the SBR1500E is an environment-friendly product, does not contain any auxiliary agent, and is one of the best materials of the invention.
3. The vulcanizing agent is 600-mesh sublimed sulfur with high content, the raw material has high purity, and the product has less residue after vulcanization and is not easy to separate out.
4. Activating agent zinc oxide, and selecting indirect method to produce the product with the content more than or equal to 99.9 percent through secondary calcination. Ensuring that the content of heavy metal does not exceed the standard.
5. The activating adjuvant stearic acid is selected from industrial first-grade products, and the content of free fatty acid is reduced to the greatest extent.
6. The reinforcing agent carbon black is selected from varieties with excellent reinforcement and wear resistance, the performance of the rubber material is improved, and the selected varieties are N115, N234 and N220.
7. The promoter is TMTD (TT, chemical name: tetramethylthiuram disulfide), which is white powder, tasteless, nontoxic, insoluble in water and acid-base water solution, heated to above 100 deg.C, slowly decomposed to separate out free sulfur, so that it can be used as vulcanizing agent, effective sulfur content is 13.3%, and vulcanization is carried out at above 140 deg.C, reaction is complete, and residue is little.
8. The anti-aging agent is RD, AW, microcrystalline wax
RD is amber resin powder and is nontoxic. Is insoluble in water. Natural rubber, styrene-butadiene rubber and other synthetic rubber.
AW is a light brown viscous liquid and is non-toxic. Natural rubber and synthetic rubber as excellent protecting agent and protecting weather aging, heat aging and flex cracking.
The microcrystalline wax is the best physical protective agent for rubber, can effectively improve the protective effect, and is nontoxic and tasteless.
9. Edible soybean oil and rubber physical plasticizer are added as little as possible.
Based on the above materials, the following formulations were obtained by testing:
TABLE 1
| Material | Dosage (mass ratio) |
| Isoprene rubber | 30-40 |
| Environment-friendly styrene butadiene rubber | 60-70 |
| Sublimed sulfur | 0.2-0.3 |
| Accelerator TMTD | 2.0-2.5 |
| 99.9% zinc oxide | 4-6 |
| First grade stearic acid | 1.2-1.8 |
| Antiager RD | 1.2-2.0 |
| Anti-aging agent AW | 1.0-1.5 |
| Microcrystalline wax | 0.6-1.0 |
| N115 carbon Black | 10-15 |
| N234 carbon Black | 15-25 |
| N220 carbon Black | 20-35 |
| Edible soybean oil | 1.0-3.0 |
The invention also provides a preparation method of the food-grade heat-resistant wear-resistant conveyor belt covering rubber, which comprises the following steps of:
step 1, weighing isoprene rubber and styrene butadiene rubber according to the proportion provided in table 1, and then putting the isoprene rubber and the styrene butadiene rubber into an internal mixer for plastication for 38-42 seconds, preferably 40 seconds;
step 2, continuously adding zinc oxide, stearic acid, antioxidant RD, antioxidant AW, microcrystalline wax and other small materials according to the proportion provided in Table 1, and mixing for 55-65 seconds, preferably 60 seconds;
step 3, adding large materials such as N115 carbon black, N234 carbon black, N220 carbon black and the like, and adjusting the flow rate of cooling water to control the temperature to be 130-140 ℃, and mixing for 120-125 seconds, preferably 120 seconds;
step 4, adding edible soybean oil, mixing for 30-35 seconds, taking out and cooling, preferably for 30 seconds;
step 5, after standing for more than 8 hours, putting the obtained rubber material into internal mixing again for mixing for 35-40 seconds, preferably 40 seconds; controlling the temperature at 80-90 ℃ by adjusting the flow rate of cooling water;
and 6, adding sublimed sulfur and an accelerator TMTD, mixing for 30-35 seconds, preferably 30 seconds, taking out the slices and cooling for later use.
Compared with the prior art, the invention changes the single performance of the cover rubber of the conveyer belt, fully meets the conveying requirement in the production process of edible salt, greatly prolongs the service life of the rubber belt, improves the benefit of salt industry enterprises, and also improves the economic benefit of the company. The performance conditions are shown in Table 2:
TABLE 2
| Performance designation | Target index | Actual measurement result | Comparison |
| Evaporation of the residue from the 4% acetic acid soak | ≤1000mg/L | 842mg/L | Is superior to the target value |
| N-ethane soak evaporation residue | ≤2000mg/L | 1737mg/L | Is superior to the target value |
| Consumption of potassium permanganate in water soak solution | ≤70mg/L | 58mg/L | Is superior to the target value |
| Heavy metal (calculated as Pb) 4% acetic acid soak solution | ≤1mg/L | 0.78mg/L | Is superior to the target value |
| After the sample is aged for 7 days at 100 DEG C | |||
| Lowest value of intensity | ≥12MPa | 13.8MPa | Is superior to the target value |
| Strength change before aging | ≤25％ | 21％ | Is superior to the target value |
| Lowest elongation at break | ≥200％ | 225％ | Is superior to the target value |
| Elongation at break changed before aging | ≤50％ | 43％ | Is superior to the target value |
| Maximum value of hardness | ≤85IRHD | 81IRHD | Is superior to the target value |
| Change in hardness before aging | ≤20IRHD | 17IRHD | Is superior to the target value |
| At normal temperature | |||
| Bonding strength with common EP canvas rubberizing | ≥8N/mm | 12.8N/mm | Is superior to the target value |
| Amount of wear | ≤70mm3 | 59mm3 | Is superior to the target value |
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (5)
1. The utility model provides a heat-resisting wear-resisting conveyer belt of food level covers and glues which characterized in that: the raw materials comprise the following components in percentage by mass:
isoprene rubber: 30-40 parts of;
styrene-butadiene rubber: 60-70 parts of;
sublimating sulfur: 0.2 to 0.3;
accelerator TMTD: 2.0-2.5;
zinc oxide: 4-6;
stearic acid: 1.2-1.8;
anti-aging agent RD: 1.2-2.0;
anti-aging agent AW: 1.0-1.5;
microcrystalline wax: 0.6-1.0;
n115 carbon Black: 10-15 parts of;
n234 carbon Black: 15-25;
n220 carbon Black: 20-35;
edible soybean oil: 1.0-3.0.
2. The food grade heat and wear resistant conveyor belt cover compound of claim 1, wherein: the styrene-butadiene rubber adopts SBR 1500E.
3. The food grade heat and wear resistant conveyor belt cover compound of claim 1, wherein: the sublimed sulfur adopts 600-mesh sublimed sulfur.
4. The food grade heat and wear resistant conveyor belt cover compound of claim 1, wherein: the zinc oxide is a product which is produced by an indirect method and has a content of more than or equal to 99.9 percent after secondary calcination.
5. The preparation method of the food-grade heat-resistant wear-resistant conveyor belt covering rubber as claimed in claim 1, characterized by comprising the following steps:
step 1, weighing 30-40 parts of isoprene rubber and 60-70 parts of styrene butadiene rubber according to the mass ratio, and putting into an internal mixer for plastication for 38-42 seconds;
step 2, adding 4-6 parts by mass of zinc oxide, 1.2-1.8 parts by mass of stearic acid, 1.2-2.0 parts by mass of antioxidant RD, 1.0-1.5 parts by mass of antioxidant AW and 0.6-1.0 parts by mass of microcrystalline wax, and mixing for 55-65 seconds;
step 3, adding the raw materials according to the mass ratio of 10-15 parts of N115 carbon black, 15-25 parts of N234 carbon black and 20-35 parts of N220 carbon black, and mixing at the temperature of 130-140 ℃ for 120-125 seconds;
step 4, adding edible soybean oil with the mass ratio of 1.0-3.0, mixing for 30-35 seconds, taking out pieces and cooling to obtain a rubber material;
step 5, after standing for more than 8 hours, putting the rubber material obtained in the step 4 into internal mixing again for mixing for 35-40 seconds, and controlling the temperature to be 80-90 ℃;
and 6, adding 0.2-0.3 mass percent of sublimed sulfur and 2.0-2.5 mass percent of promoter TMTD, mixing for 30-35 seconds, taking out, and cooling for later use.
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Citations (7)
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|---|---|---|---|---|
| CN103242565A (en) * | 2013-05-21 | 2013-08-14 | 江苏福莱欧工业制带有限公司 | Food conveying belt |
| CN106366379A (en) * | 2016-08-30 | 2017-02-01 | 林聚 | Conveyor belt cover rubber with good weather resistance and preparation method thereof |
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