Rubber composition for cleaning scale deposit on mold

Abstract

The invention relates to a rubber composition for cleaning mold scale. The rubber composition is prepared from the following components in parts by mass: 100 parts of ethylene propylene rubber, 50-80 parts of white carbon black, 8-20 parts of octoxinol, 7-15 parts of p-butyl benzyl alcohol, 5-15 parts of potassium hydroxide, 1-5 parts of nonylphenol polyoxyethylene ether and 0.5-2.5 parts of vulcanizing agent DCP. The invention belongs to the field of rubber, and has the advantages of simple production process, no need of mold disassembly and in-situ mold cleaning, good mold cleaning effect, simple formula, low cost, no pollution to the environment, high strength and small Mooney viscosity.

Description

Technical Field

[0001] The invention belongs to the field of rubber, and particularly relates to a rubber composition for cleaning mold fouling. Background Art

[0002] In the rubber processing industry, mold scaling is a common phenomenon. During the rubber vulcanization process, a layer of deposits will form on the mold wall, which will firmly bond to the mold surface and gradually accumulate in the subsequent production links. As the thickness of the scale increases, it will affect the product appearance and dimensional accuracy, and will also affect the heat transfer between the mold and the rubber, affecting the molding of the product. In more serious cases, the scale will adhere to the molded product, causing surface quality problems of the product, and may also corrode the mold and affect production efficiency. Especially when it appears in certain key parts, it will also cause the rubber product to be scrapped.

[0003] There are many methods for cleaning mold scale at present. Conventional mold cleaning methods are: first, manual descaling: rubbing with a metal brush or sandpaper surface; second, mechanical descaling: sandblasting, water grinding, etc.; third, chemical descaling: cleaning with special mold washing water; fourth, electrolytic descaling: in an alkaline electrolytic cell, water is electrolyzed into hydrogen and oxygen, forming bubbles on the metal surface of the mold to wash away mold scale; fifth, ultrasonic descaling: using the principle of frequency and wavelength to shake off the scale in the mold, and the effect is better when used with mold washing water. Sixth, in-situ cleaning: using mold glue to wash the mold, the mold glue can be attached to the mold surface during the vulcanization process, and the mold scale is removed by demolding.

[0004] Most of the above methods require raising and lowering the temperature, which is complicated to operate; the mold needs to be disassembled, the cleaning cycle is long, and the cleaning efficiency is low; manual descaling, mechanical descaling, etc. will also cause irreversible damage to the mold; the formula has many components, the ingredients are complex, and it often contains pigments, which is not only costly, but also easy to cause secondary pollution; for precision structure molds, it is not easy to clean; ultrasonic descaling and electro-etching descaling have very high cleaning costs, and the cleaning ingredients often contain cleaning ingredients such as acids, alkalis, and metal salts, which have potential corrosion effects on the mold under cleaning conditions. The problems existing in the above existing technologies have limited mold cleaning to a certain extent, and greatly increased the cost of mold cleaning. Therefore, in-situ cleaning is the main direction of the current development of mold scaling cleaning technology.

[0005] Patent application CN201310082200.1 provides a mold cleaning glue for in-situ cleaning of molds: the raw material components are: 100 parts by mass of unvulcanized rubber or modified rubber, 30-60 parts by mass of reinforcing agent, 10-30 parts by mass of cleaning agent, 1-3 parts by mass of vulcanizing agent, 1-10 parts by mass of vulcanization accelerator and 1-10 parts by mass of pigment. This technical solution uses butadiene rubber as the base material and compounding agent as the auxiliary material. The strength is relatively low, less than 6MPa. When cleaning the mold, the glue is easy to remain in the mold. In addition, sulfur is used, which is easy to produce sulfide, which is also easy to produce fouling, causing secondary fouling of the mold.

[0006] Patent application CN202211472011.0 provides a mold cleaning glue for cleaning mold scale, which is used for mold cleaning and is composed of the following components in weight percentage: 30.0-65.0% raw rubber; 12.5-41.0% reinforcing agent; 0.5-3.0% active agent; 2.5-8.5% tackifier; 1.0-5.0% penetrant; 2.5-10.5% cleaning agent; 0.3-2.0% vulcanizer. The mold cleaning glue has a high Mooney value, between 60-80, and the lowest is above 59.8; high Mooney is not good for complex molds, it is not easy to enter every corner of the mold, and the cleaning efficiency is low; and there are many components, complex ingredients, high cost, and the preparation process also requires two mixing steps, which is relatively cumbersome.

[0007] Patent application CN201710306380.5 provides an online non-disassembly and assembly-free mold cleaning material for rubber product molds and a preparation method thereof. The raw material components include, by mass: 100 parts of unvulcanized rubber, 40-70 parts of reinforcing filler, 5-30 parts of cleaning agent, 5-15 parts of cleaning aid, 1-5 parts of vulcanizing agent, 0.5-3 parts of vulcanizing aid, 5-15 parts of processing aid, and 1-5 parts of dye. The cleaning agent used in this technical solution includes low-boiling point substances such as water, so the smoke is particularly large during high-temperature vulcanization, and the addition of dyes will cause secondary pollution. Summary of the invention

[0008] In view of the above problems, the present invention provides a composition for cleaning mold scale, which has a simple production process, does not require mold disassembly, can clean the mold in situ, has good mold cleaning effect, simple formula, low cost, no pollution to the environment, high strength, low Mooney viscosity, and less smoke during the vulcanization process, and has a good cleaning effect on complex and fine molds.

[0009] In order to achieve the above object, the technical solution proposed by the present invention is:

[0010] A rubber composition for cleaning mold scale, comprising the following components (expressed in parts by mass):

[0011] 100 parts of ethylene propylene rubber, 50-80 parts of white carbon black, 8-20 parts of octoxynol, 7-15 parts of p-butylbenzyl alcohol, 5-15 parts of potassium hydroxide, 1-5 parts of nonylphenol polyoxyethylene ether, and 0.5-2.5 parts of vulcanizing agent DCP;

[0012] The EPDM rubber is raw rubber. EPDM rubber has good high temperature resistance and is suitable for peroxide vulcanization. In the prior art, natural rubber is used as the base material. Although natural rubber is relatively cheap, it is easily degraded at high temperatures when vulcanized with peroxides. In particular, when the vulcanization temperature exceeds 160°C, the strength is significantly reduced and there is a tendency to stick to the mold. EPDM rubber has good aging resistance and does not require the addition of antioxidants. Moreover, the rubber composition used for cleaning mold scale is vulcanized during use after mixing and is used once, so there is no need to add antioxidants. Anti-aging agents are generally amines or phenolic compounds, which interfere with the peroxide vulcanization process.

[0013] The white carbon black is a reinforcing agent. In the prior art, calcium carbonate, talcum powder, etc. are added. These inorganic substances have poor reinforcing effects and are prone to sticking to the mold if added too much. White carbon black has high strength. After a large number of experimental tests, the white carbon black content is continuously adjusted. Only using white carbon black as a reinforcing agent can achieve a good reinforcing effect;

[0014] The octoxynol and p-butylbenzyl alcohol are cleaning agents. Both octoxynol and p-butylbenzyl alcohol are proton solvents, both are high boiling point solvents (boiling point not less than 250°C), both can dissolve potassium hydroxide, and are conducive to the activity of potassium hydroxide. In the prior art, ethylene glycol or ethanol is used. Although these can dissolve potassium hydroxide and sodium hydroxide, they have a low boiling point and are easy to volatilize. A large amount of smoke will be released during the high-temperature vulcanization and mold opening of rubber. The boiling point of octoxynol and p-butylbenzyl alcohol is higher than that of ethylene glycol at 197°C. Both alcohols are liquids. Because they contain multiple carbons and benzene rings, they are less polar than ethylene glycol and triethanolamine, and have better compatibility with the ethylene-propylene rubber. The use of two alcohols can avoid the risk of precipitation. Because a single alcohol is used, it is easy to precipitate on the rubber surface in large quantities, affecting processability and physical properties, especially tensile strength, thereby also affecting the mold washing effect. By using two alcohols in combination, with the amount of each alcohol being relatively small, both alcohols can be within the saturated solubility of EPDM rubber, so there will be no precipitation problem, and the mold cleaning effect is also ensured. By combining with the cleaning agent white carbon black, a lower Mooney viscosity can be obtained. These two alcohols are relatively safe for the human body. The prior art uses monoethanolamine (boiling point 170°C, relatively low), triethanolamine, and diethanolamine, which are irritating and toxic; they also have a flammable risk and are highly corrosive. The use of octoxynol and p-butylbenzyl alcohol can effectively overcome the above shortcomings;

[0015] The potassium hydroxide has a strong alkalinity and a high reactivity with mold scale, and is more effective than triethanolamine, sodium hydroxide, and sodium metasilicate;

[0016] The nonylphenol polyoxyethylene ether is a surfactant, which is beneficial to the mixing of octoxynol, p-butylbenzyl alcohol and rubber, and is also beneficial to the mixed rubber to better infiltrate the metal mold;

[0017] The vulcanizing agent is a peroxide, and the peroxide is a compound containing diisopropylbenzene peroxide (DCP) and no sulfur. The DCP vulcanization has a simple formula, and only the amount of DCP needs to be adjusted, and no auxiliary cross-linking agent needs to be added. In particular, sulfur-containing substances, such as various sulfur-containing accelerators and sulfur, are not used in this technical solution. Sulfur-containing substances themselves are also the main factor causing mold fouling, and the components of the mold cleaning glue in the prior art are mostly alkaline, which will react with the sulfur-containing accelerator, reduce the performance of the mold cleaning glue, and also cause mold pollution. BIPB vulcanization is also used in the prior art. The thermal decomposition temperature of BIPB is higher than that of DCP, and the corresponding vulcanization temperature is above 180°C. This temperature is not good for low-boiling point mold cleaning components and is more likely to volatilize. When the vulcanization temperature is high, the rubber strength will decrease, which will also reduce the ability of the mold cleaning glue to remove fouling; if natural rubber is used as raw rubber, such a high vulcanization temperature will cause more serious degradation of natural rubber and worse cleaning effect;

[0018] Preferably, the rubber composition for cleaning mold scale is composed of the following components (expressed in parts by mass): 100 parts of ethylene propylene rubber, 55-65 parts of white carbon black, 10-16 parts of octoxynol, 10-14 parts of p-butylbenzyl alcohol, 8-12 parts of potassium hydroxide, 2-4 parts of nonylphenol polyoxyethylene ether, and 1-2 parts of vulcanizing agent DCP;

[0019] Preferably, the rubber composition for cleaning mold scale is characterized in that the rubber composition for cleaning mold scale is composed of the following components (expressed in parts by mass): 100 parts of ethylene propylene rubber, 56-63 parts of white carbon black, 11-14 parts of octoxynol, 11-13 parts of p-butylbenzyl alcohol, 9-11 parts of potassium hydroxide, 2.4-3.5 parts of nonylphenol polyoxyethylene ether, and 1.2-1.8 parts of vulcanizing agent DCP;

[0020] Preferably, the rubber composition for cleaning mold scale is characterized in that the ratio of octoxynol to p-butylbenzyl alcohol is 0.8:1 to 1.5:1;

[0021] Preferably, the rubber composition for cleaning mold scale is characterized in that the ratio of the sum of the amount of octoxynol and p-butylbenzyl alcohol to potassium hydroxide is not less than 1:1;

[0022] The synergistic effect of several components: mold scale is in the form of flakes and tightly adheres to the mold. The cleaning process is a process of first soaking, breaking, coating and dissolving it, and then taking it away. Potassium hydroxide is the main component for decomposing mold scale. In order to fully exert its effect, octoxynol and 4-butylbenzyl alcohol are used as catalysts. These two alcohols can soak and dissolve potassium hydroxide, making potassium hydroxide dispersed and dissociated, making potassium hydroxide more easily react with mold scale. Nonylphenol polyoxyethylene ether is a surfactant with good compatibility with polar and non-polar substances. On the one hand, it makes these two alcohols more compatible with EPDM rubber, and at the same time, it also has the function of soaking and coating the mold scale molecules reacted by potassium hydroxide. EPDM and white carbon black play a role similar to that of adhesives. Before vulcanization, they have a certain fluidity, carry the mold cleaning agent to fill the mold cavity, and can adhere to mold scale and its decomposition products. Under the action of peroxide DCP, EPDM is vulcanized, and under the action of white carbon black reinforcement, it has a certain mechanical strength, so it can adhere to the above decomposition products. With vulcanization and demolding, it can remove the mold scale decomposition residues, thereby achieving the effect of cleaning the mold. The appropriate ratio of these components can maximize the synergistic effect of each component and reduce waste.

[0023] The present invention also discloses a method for preparing the rubber composition for cleaning mold scale, and the method comprises the following steps in sequence:

[0024] (1) Preparation of materials: weigh and set aside in order according to the proportion;

[0025] (2) using an internal mixer to mix, adjusting the mixing temperature of the mixer to 55-70° C., adding ethylene propylene rubber, white carbon black, butylbenzyl alcohol, octoxynol, potassium hydroxide, and nonylphenol polyoxyethylene ether for mixing, and mixing for 180-300 seconds;

[0026] (3) When the temperature reaches 100°C, add DCP and mix for 30-60 seconds;

[0027] (4) placing the mixture obtained in step (3) on an open mill and refining the sheet, leaving it for not less than 16 hours and cutting it for later use;

[0028] (5) placing the rubber composition for cleaning mold scale prepared in step (4) on the dirty mold, closing the mold, and vulcanizing at a temperature of 170° C. for 200-300 seconds. During the vulcanization process, the cleaning agent in the rubber composition for cleaning mold scale flows through the rubber composition for cleaning mold scale and impregnates every corner of the mold, reacting with the scale on the mold, and the scale adheres to the rubber composition for cleaning mold scale. After the vulcanization is completed, the rubber composition for cleaning mold scale is taken out;

[0029] (6) For very dirty molds, repeat step (5) until they are clean.

[0030] The above technical solution has the following beneficial effects:

[0031] 1. Simple formula, few components, low cost, simple and fast production process, only one mixing step is needed;

[0032] Second, the rubber composition used for cleaning mold fouling has high strength (tensile strength greater than 13MPa) and low Mooney viscosity (Mooney viscosity less than 55);

[0033] 3. There is less smoke during the vulcanization process, no secondary pollution, and no harm to the human body;

[0034] Fourth, when using this mold cleaning glue for cleaning, there is no need to disassemble the mold, and it can be cleaned in situ, saving time and cost;

[0035] Fifth, the comprehensive synergistic benefits of each component are fully utilized. The rubber composition for cleaning mold scale prepared by the present invention has a high degree of saturation, good stability to heat and chemicals, is not easy to be over-refined and over-sulfurized, is not easy to age, deteriorate, and self-sulfurize during storage, and has no secondary pollution to the mold. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with embodiments.

[0037] Example 1: A rubber composition for cleaning mold fouling, consisting of the following components (expressed in parts by mass):

[0038] 100 parts of ethylene propylene rubber, 50 parts of white carbon black, 8 parts of octoxynol, 7 parts of p-butylbenzyl alcohol, 15 parts of potassium hydroxide, 5 parts of nonylphenol polyoxyethylene ether, and 0.5 parts of DCP.

[0039] Example 2: A rubber composition for cleaning mold fouling, consisting of the following components (expressed in parts by mass):

[0040] 100 parts of ethylene propylene rubber, 55 parts of white carbon black, 10 parts of octoxynol, 10 parts of p-butylbenzyl alcohol, 12 parts of potassium hydroxide, 4 parts of nonylphenol polyoxyethylene ether, and 2 parts of DCP.

[0041] Example 3: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0042] 100 parts of ethylene propylene rubber, 60 parts of white carbon black, 12.5 parts of octoxynol, 12.5 parts of p-butylbenzyl alcohol, 10 parts of potassium hydroxide, 3 parts of nonylphenol polyoxyethylene ether, and 1.5 parts of DCP.

[0043] Example 4: A rubber composition for cleaning mold fouling, consisting of the following components (expressed in parts by mass):

[0044] 100 parts of ethylene propylene rubber, 65 parts of white carbon black, 16 parts of octoxynol, 14 parts of p-butylbenzyl alcohol, 8 parts of potassium hydroxide, 2 parts of nonylphenol polyoxyethylene ether, and 1 part of DCP.

[0045] Example 5: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0046] 100 parts of ethylene propylene rubber, 80 parts of white carbon black, 20 parts of octoxynol, 15 parts of p-butylbenzyl alcohol, 5 parts of potassium hydroxide, 1 part of nonylphenol polyoxyethylene ether, and 2.5 parts of DCP.

[0047] Example 6: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0048] 100 parts of ethylene propylene rubber, 57 parts of white carbon black, 12 parts of octoxynol, 12 parts of p-butylbenzyl alcohol, 14 parts of potassium hydroxide, 1.6 parts of nonylphenol polyoxyethylene ether, and 0.8 parts of DCP.

[0049] Example 7: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0050] 100 parts of ethylene propylene rubber, 63 parts of white carbon black, 14 parts of octoxynol, 11 parts of p-butylbenzyl alcohol, 11 parts of potassium hydroxide, 2.4 parts of nonylphenol polyoxyethylene ether, and 1.2 parts of DCP.

[0051] Example 8: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0052] 100 parts of ethylene propylene rubber, 56 parts of white carbon black, 11 parts of octoxynol, 13 parts of p-butylbenzyl alcohol, 9 parts of potassium hydroxide, 3.5 parts of nonylphenol polyoxyethylene ether, and 1.8 parts of DCP.

[0053] Example 9: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0054] 100 parts of ethylene propylene rubber, 67 parts of white carbon black, 13 parts of octoxynol, 9 parts of p-butylbenzyl alcohol, 6 parts of potassium hydroxide, 4.5 parts of nonylphenol polyoxyethylene ether, and 2.1 parts of DCP.

[0055] Example 10: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0056] 100 parts of ethylene propylene rubber, 75 parts of white carbon black, 18 parts of octoxynol, 14 parts of p-butylbenzyl alcohol, 7 parts of potassium hydroxide, 1.4 parts of nonylphenol polyoxyethylene ether, and 2.3 parts of DCP.

[0057] Embodiment 11: The preparation and use method of the rubber composition for cleaning mold fouling comprises the following steps:

[0058] (1) Material preparation: ethylene propylene rubber, white carbon black, p-butylbenzyl alcohol, octoxynol, potassium hydroxide, nonylphenol polyoxyethylene ether, and DCP are weighed in order according to the ratio and set aside;

[0059] (2) using an internal mixer to mix, adjusting the mixing temperature of the mixer to 55-70° C., adding ethylene propylene rubber, white carbon black, butylbenzyl alcohol, octoxynol, potassium hydroxide, and nonylphenol polyoxyethylene ether for mixing, and mixing for 180-300 seconds;

[0060] (3) When the temperature reaches 100°C, add DCP and mix for 30-60 seconds;

[0061] (4) placing the mixture obtained in step (3) on an open mill and refining the sheet, leaving it for not less than 16 hours and cutting it for later use;

[0062] (5) placing the rubber composition for cleaning mold scale prepared in step (4) on the dirty mold, closing the mold, and vulcanizing at a temperature of 170° C. for 200-300 seconds. During the vulcanization process, the cleaning agent in the rubber composition for cleaning mold scale flows through the rubber composition for cleaning mold scale and impregnates every corner of the mold, reacting with the scale on the mold, and the scale adheres to the rubber composition for cleaning mold scale. After the vulcanization is completed, the rubber composition for cleaning mold scale is taken out;

[0063] (6) For very dirty molds, repeat step (5) until they are clean.

[0064] The cleaning effect of the rubber composition for cleaning mold deposits is evaluated as follows: one clean is excellent; two cleans are good; three cleans are medium; four cleans are fair; and four cleans are poor.

[0065] Regarding the smoke evaluation of the rubber composition used for cleaning the above-mentioned mold scale: when the mold is opened after the mold cleaning rubber is vulcanized, if there is an obvious sound accompanied by smoke emission, it is loud; if there is no sound and no obvious smoke, it is small.

[0066] The present invention uses fewer formula components than the prior art, obtains the best formula content through a large number of experimental verifications, and obtains performance indicators that are better than the prior art, achieving unexpected technical effects.

[0067] The formulations and performance results of Comparative Examples 1-5 and Examples 1-10 are detailed in the table below.

[0068] Comparative Example 1: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0069] 100 parts of ethylene propylene rubber, 60 parts of white carbon black, 10 parts of sodium hydroxide, 3 parts of isooctyl polyoxyethylene ether monophosphate, 1.5 parts of DCP, and 25 parts of ethylene glycol.

[0070] Comparative Example 2: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0071] 100 parts of natural rubber, 60 parts of white carbon black, 3 parts of monoalkyl ether potassium phosphate, 1.5 parts of BIPB, and 25 parts of propylene glycol methyl ether.

[0072] Comparative Example 3: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0073] 100 parts of ethylene propylene rubber, 60 parts of white carbon black, 10 parts of sodium hydroxide, 3 parts of monoalkyl ether phosphate potassium salt, 1.5 parts of DCP, and 25 parts of triethanolamine.

[0074] Comparative Example 4: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0075] 100 parts of ethylene propylene rubber, 60 parts of talc, 10 parts of sodium hydroxide, 3 parts of isooctyl polyoxyethylene ether monophosphate, 1.5 parts of DCP, 12.5 parts of ethylene glycol, and 12.5 parts of triethanolamine.

[0076] Comparative Example 5: A rubber composition for cleaning mold scale, consisting of the following components (expressed in parts by mass):

[0077] 100 parts of ethylene propylene rubber, 60 parts of calcium carbonate, 10 parts of sodium hydroxide, 3 parts of monoalkyl ether potassium phosphate, 1.5 parts of DCP, 12.5 parts of propylene glycol dimethyl ether, and 12.5 parts of triethanolamine.

[0078]

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rubber composition for cleaning mold fouling, characterized in that: The invention is composed of the following components (expressed in parts by mass): 100 parts of ethylene propylene rubber, 50-80 parts of white carbon black, 8-20 parts of octoxynol, 7-15 parts of p-butylbenzyl alcohol, 5-15 parts of potassium hydroxide, 1-5 parts of nonylphenol polyoxyethylene ether and 0.5-2.5 parts of vulcanizing agent DCP.

2. A rubber composition for cleaning mold fouling according to claim 1, characterized in that: The rubber composition for cleaning mold scale is composed of the following components (expressed in parts by mass): 100 parts of ethylene propylene rubber, 55-65 parts of white carbon black, 10-16 parts of octoxynol, 10-14 parts of p-butylbenzyl alcohol, 8-12 parts of potassium hydroxide, 2-4 parts of nonylphenol polyoxyethylene ether, and 1-2 parts of vulcanizing agent DCP.

3. The rubber composition for cleaning mold fouling according to claim 1, characterized in that: The rubber composition for cleaning mold scale is composed of the following components (expressed in parts by mass): 100 parts of ethylene propylene rubber, 56-63 parts of white carbon black, 11-14 parts of octoxynol, 11-13 parts of p-butylbenzyl alcohol, 9-11 parts of potassium hydroxide, 2.4-3.5 parts of nonylphenol polyoxyethylene ether, and 1.2-1.8 parts of vulcanizing agent DCP.

4. The rubber composition for cleaning mold fouling according to claim 1, characterized in that: The ratio of octoxynol to p-butylbenzyl alcohol is 0.8:1 to 1.5:

1.

5. The rubber composition for cleaning mold scale according to claim 1, characterized in that: The ratio of the sum of the amounts of octoxynol and p-butylbenzyl alcohol to potassium hydroxide is not less than 1:

1.

6. A method for preparing a rubber composition for cleaning mold fouling according to claim 1, the method comprising the following steps in sequence: (1) Preparation of materials: weigh and set aside in order according to the proportion; (2) using an internal mixer to mix, adjusting the mixing temperature of the mixer to 55-70° C., adding ethylene propylene rubber, white carbon black, butylbenzyl alcohol, octoxynol, potassium hydroxide, and nonylphenol polyoxyethylene ether for mixing, and mixing for 180-300 seconds; (3) When the temperature reaches 100°C, add DCP and mix for 30-60 seconds; (4) placing the mixture obtained in step (3) on an open mill and re-refining the sheet, leaving it for not less than 16 hours and cutting it for later use; (5) placing the rubber composition for cleaning mold scale prepared in step (4) on the dirty mold, closing the mold, and vulcanizing at a temperature of 170° C. for 200-300 seconds. During the vulcanization process, the cleaning agent in the rubber composition for cleaning mold scale flows through the rubber composition for cleaning mold scale and impregnates every corner of the mold, reacting with the scale on the mold, and the scale adheres to the rubber composition for cleaning mold scale. After the vulcanization is completed, the rubber composition for cleaning mold scale is taken out; (6) For very dirty molds, repeat step (5) until they are clean.

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