CN118063898A

CN118063898A - Rubber material for cleaning mold

Info

Publication number: CN118063898A
Application number: CN202410167634.XA
Authority: CN
Inventors: 陈增宝; 孙卫华; 田友峰; 凌毅; 秦岩; 金贝
Original assignee: Anhui Cooper Sealing Technology Co ltd
Current assignee: Anhui Cooper Sealing Technology Co ltd
Priority date: 2024-02-06
Filing date: 2024-02-06
Publication date: 2024-05-24

Abstract

The invention discloses a rubber material for cleaning a die, which comprises the following raw materials in parts by mass: 100 parts of EPDM raw rubber, 15-25 parts of triethanolamine, 10-15 parts of isopropanolamine, 10-15 parts of emulsifier OP-10-15 parts of rubber self-cleaning agent ZJ-1 5-10 parts of talcum powder 30-50 parts, 10-15 parts of white carbon black, 3-5 parts of zeolite powder, 0.8-2 parts of vulcanizing agent, 0.5-1.5 parts of vulcanization accelerator, 2-5 parts of zinc oxide and 0.5-2 parts of lubricant. The rubber material for cleaning the mold has excellent cleaning effect, can improve the cleaning effect of the production mold of the rubber product with a complex structure, can clean the rubber mold more thoroughly, and effectively improves the production efficiency of the rubber product.

Description

Rubber material for cleaning mold

Technical Field

The invention relates to the technical field of rubber materials, in particular to a rubber material for cleaning a die.

Background

During the long-term use of the rubber product mold, substances such as exudates and release agents in the rubber are decomposed and carbonized by repeated heating, and adhere to the inner surface of the mold, so that scaling is inevitably generated. These dirt are difficult to remove, and can affect the surface smoothness of the rubber product, so that the appearance quality of the rubber product is seriously reduced, and even the accuracy of the product size can be affected with the increment of the thickness of the dirt layer. In order to ensure proper use of the mold, the mold must be cleaned periodically. The conventional mold cleaning methods mainly comprise sand blasting, alkali cleaning, ultrasonic waves and the like, and the methods have the problems of poor cleaning effect, long cleaning time or complex equipment and the like. The use of the mold cleaning glue is a relatively simple and convenient cleaning means which does not damage the mold and has high cleaning precision, the vulcanizable rubber material is filled in the mold, the mold is vulcanized, dirt in the mold is softened and adhered on the surface of the rubber under the action of a cleaning agent in the rubber material, and the mold is removed and the dirt is removed. The formula of the rubber material for cleaning the die has great influence on the cleaning effect, especially the rubber product with a complex structure, and the cleaning effect is more dependent on the performance of the rubber material for cleaning the die. Therefore, in order to more thoroughly clean the rubber mold, thereby improving the production efficiency of the rubber product, it is necessary to further optimize the formulation of the rubber material for cleaning the mold. In addition, in order to facilitate storage and turnover, the rubber material for cleaning the mold preferably has good performance stability after storage while ensuring excellent cleaning effect.

Disclosure of Invention

Based on the technical problems in the background technology, the invention provides a rubber material for cleaning a mold.

The invention provides a rubber material for cleaning a mold, which comprises the following raw materials in parts by mass: 100 parts of EPDM raw rubber, 15-25 parts of triethanolamine, 10-15 parts of isopropanolamine, 10-15 parts of emulsifier OP-10-15 parts of rubber self-cleaning agent ZJ-1 5-10 parts of talcum powder 30-50 parts, 10-15 parts of white carbon black, 3-5 parts of zeolite powder, 0.8-2 parts of vulcanizing agent, 0.5-1.5 parts of vulcanization accelerator, 2-5 parts of zinc oxide and 0.5-2 parts of lubricant;

The EPDM raw rubber is prepared from low-Mooney EPDM and high-Mooney EPDM according to the mass ratio of (20-40): (60-80); the Mooney viscosity of the low Mooney EPDM is 20-30MU under the test condition of ML (1+4) 125 ℃, and the Mooney viscosity of the high Mooney EPDM is 60-80MU under the test condition of ML (1+4) 125 ℃.

Wherein the rubber self-cleaning agent ZJ-1 is produced by Shanghai Maotong Industry Co., ltd.

Preferably, the EPDM raw rubber has an ethylene content of 50 to 60% by weight and the third monomer ENB has a content of 5 to 9% by weight.

Preferably, the white carbon black is hyperbranched polyester grafted white carbon black.

Preferably, the preparation method of the hyperbranched polyester grafted white carbon black comprises the following steps: and (3) reacting the white carbon black modified by the silane coupling agent KH-550 with 2, 2-dimethylolpropionic acid under the catalysis of p-toluenesulfonic acid to obtain the hyperbranched polyester grafted white carbon black.

Specifically, the preparation method of the hyperbranched polyester grafted white carbon black comprises the following steps:

Adding white carbon black modified by a silane coupling agent KH-550 into dimethylbenzene under nitrogen atmosphere, dispersing uniformly, then adding p-toluenesulfonic acid, carrying out heating reflux reaction at 130-140 ℃, adding 2, 2-dimethylolpropionic acid in 3-5 batches in the reaction process, adding each batch for 20-30 min at a time interval, cooling, filtering and drying after the reaction is finished, thus obtaining the catalyst; wherein the dosage of the p-toluenesulfonic acid is 0.1-0.2% of the mass of the white carbon black modified by the silane coupling agent KH-550, the total addition amount of the 2, 2-dimethylolpropionic acid is 30-50% of the mass of the white carbon black modified by the silane coupling agent KH-550, and the ratio of the white carbon black modified by the silane coupling agent KH-550 to the dimethylbenzene is 1g: (200-500) mL.

Preferably, the vulcanizing agent is sulfur.

Preferably, the vulcanization accelerator is at least one of vulcanization accelerator DM, vulcanization accelerator TMTD and vulcanization accelerator MBTS.

Preferably, the lubricant is at least one of stearic acid, sodium stearate, calcium stearate, and oleamide.

In the present invention, EPDM refers to ethylene propylene diene monomer.

The preparation method of the rubber material for cleaning the mold comprises the following steps: mixing EPDM raw rubber, talcum powder, white carbon black and zeolite powder uniformly, mixing at 120-140 ℃ for 2-5min, adding other raw materials, and mixing at 85-95 ℃ for 1-2min to obtain the product.

The beneficial effects of the invention are as follows:

The invention uses low-Mooney EPDM and high-Mooney EPDM as raw rubber, so that the rubber material has good processing fluidity and mechanical strength, can enter into a die with a complex structure, can sufficiently clean the corner of the die, can be smoothly stripped from the die after vulcanization, and has no residue; the triethanolamine, the isopropanolamine, the emulsifier OP-10 and the rubber self-cleaning agent ZJ-1 are mixed in a proper proportion to be used as the cleaning agent, so that excellent cleaning effect can be ensured, the cleaning agent is not easy to volatilize, the precipitation amount is low, and the processing and the use are convenient; talcum powder, white carbon black and zeolite powder are used as fillers, so that the zeolite powder can absorb odor while the mechanical strength is ensured, and the odor is reduced. The invention can also adopt hyperbranched polyester grafted white carbon black, can limit the migration, volatilization and precipitation of the cleaning agent in the sizing material, further improve the storage stability of the sizing material, greatly reduce the volatilization and precipitation amount of the cleaning agent in the sizing material in storage, and can be stored for a long time to maintain excellent cleaning performance. In summary, the rubber material for cleaning the mold has excellent cleaning effect, can improve the cleaning effect of the production mold of the rubber product with a complex structure, can clean the rubber mold more thoroughly, effectively improves the production efficiency of the rubber product, has good stability, and is convenient for storage and turnover use.

Drawings

FIG. 1 is a photograph of the surface of the rubber compound of example 1 after the rubber material was vulcanized and the mold was cleaned.

Detailed Description

The technical scheme of the invention is described in detail through specific embodiments.

In the following examples and comparative examples, the rubber self-cleaning agent ZJ-1 was produced by Shanghai Maotong Industry Co., ltd.

Example 1

The rubber material for cleaning the die comprises the following raw materials in parts by mass: 100 parts of EPDM raw rubber, 20 parts of triethanolamine, 12 parts of isopropanolamine, 12 parts of emulsifier OP-10 parts, ZJ-1 8 parts of rubber self-cleaning agent, 40 parts of talcum powder, 12 parts of fumed silica, 4 parts of zeolite powder, 1 part of sulfur, 1 part of vulcanization accelerator DM, 3 parts of zinc oxide and 1 part of sodium stearate;

The EPDM raw rubber consists of low-Mooney EPDM and high-Mooney EPDM according to the mass ratio of 30:70; the Mooney viscosity of the low-Mooney EPDM under the ML (1+4) 125 ℃ test condition is 20-30MU, and the Mooney viscosity of the high-Mooney EPDM under the ML (1+4) 125 ℃ test condition is 60-80MU;

The EPDM raw rubber has an ethylene content of 50 to 60wt% and the third monomer ENB has a content of 5 to 9wt%.

Example 2

The rubber material for cleaning the die comprises the following raw materials in parts by mass: 100 parts of EPDM raw rubber, 15 parts of triethanolamine, 15 parts of isopropanolamine, 15 parts of emulsifier OP-10 parts, 30 parts of rubber self-cleaning agent ZJ-1 5 parts of talcum powder, 15 parts of fumed silica, 5 parts of zeolite powder, 0.8 part of sulfur, 0.5 part of vulcanization accelerator DM, 2 parts of zinc oxide and 0.5 part of sodium stearate;

The EPDM raw rubber consists of low-Mooney EPDM and high-Mooney EPDM according to the mass ratio of 20:80; the Mooney viscosity of the low-Mooney EPDM under the ML (1+4) 125 ℃ test condition is 20-30MU, and the Mooney viscosity of the high-Mooney EPDM under the ML (1+4) 125 ℃ test condition is 60-80MU;

The method for producing the rubber material for mold cleaning was the same as in example 1.

Example 3

The rubber material for cleaning the die comprises the following raw materials in parts by mass: 100 parts of EPDM raw rubber, 25 parts of triethanolamine, 10 parts of isopropanolamine, 10 parts of emulsifier OP-10 parts, 1 part of rubber self-cleaning agent ZJ-1, 50 parts of talcum powder, 10 parts of fumed silica, 3 parts of zeolite powder, 2 parts of sulfur, 1.5 parts of vulcanization accelerator DM, 5 parts of zinc oxide and 2 parts of sodium stearate;

The EPDM raw rubber consists of low-Mooney EPDM and high-Mooney EPDM according to the mass ratio of 40:60; the Mooney viscosity of the low-Mooney EPDM under the ML (1+4) 125 ℃ test condition is 20-30MU, and the Mooney viscosity of the high-Mooney EPDM under the ML (1+4) 125 ℃ test condition is 60-80MU;

Comparative example 1

The rubber material for cleaning the die comprises the following raw materials in parts by mass: 100 parts of EPDM raw rubber, 32 parts of triethanolamine, 10 parts of emulsifier OP-10 parts of rubber self-cleaning agent ZJ-1 8 parts of talcum powder 40 parts of gas-phase white carbon black 12 parts of zeolite powder 4 parts of sulfur 1 part of vulcanization accelerator DM 1 part of zinc oxide 3 parts of sodium stearate 1 part of sodium stearate; the EPDM rubber was identical in composition and parameters to example 1.

Comparative example 2

The rubber material for cleaning the die comprises the following raw materials in parts by mass: 100 parts of EPDM raw rubber, 32 parts of triethanolamine, 12 parts of isopropanolamine, 40 parts of talcum powder, 12 parts of fumed silica, 4 parts of zeolite powder, 1 part of sulfur, 1 part of vulcanization accelerator DM, 3 parts of zinc oxide and 1 part of sodium stearate; the EPDM rubber was identical in composition and parameters to example 1.

Comparative example 3

The rubber material for cleaning the die comprises the following raw materials in parts by mass: 100 parts of EPDM raw rubber, 28 parts of triethanolamine, 12 parts of isopropanolamine, 12 parts of emulsifier OP-10, 40 parts of talcum powder, 12 parts of fumed silica, 4 parts of zeolite powder, 1 part of sulfur, 1 part of vulcanization accelerator DM, 3 parts of zinc oxide and 1 part of sodium stearate; the EPDM rubber was identical in composition and parameters to example 1.

Comparative example 4

The EPDM raw rubber is low-Mooney EPDM, and the Mooney viscosity of the EPDM raw rubber is 20-30MU under the testing condition of ML (1+4) 125 ℃; the EPDM raw rubber has an ethylene content of 50 to 60wt% and the third monomer ENB has a content of 5 to 9wt%.

Comparative example 5

The EPDM raw rubber is high-Mooney EPDM, and the Mooney viscosity of the EPDM raw rubber is 60-80MU under the testing condition of ML (1+4) 125 ℃; the EPDM raw rubber has an ethylene content of 50 to 60wt% and the third monomer ENB has a content of 5 to 9wt%.

Test example 1

The rubber materials of example 1 and comparative examples 1-5 were used to clean the mold of the fouled rubber seal ring, respectively, by the following method: and (3) placing the rubber material into a dirt rubber sealing ring mould, vulcanizing for 600 seconds at the temperature of 180 ℃, taking out the vulcanized rubber material, and observing the cleaning effect of the mould. The cleaned mould is continuously used for production, and the production conditions are as follows: 8h, producing 3500 sealing ring products per shift by each die, wherein the sealing ring products comprise HNBR and hydrogenated nitrile rubber three shifts per day; observing the days that the appearance of the sealing ring produced by the cleaned die is qualified, wherein the appearance qualification standard of the sealing ring is according to ISO3601-N level, and no obvious die dirt appearance defect exists; the results are shown in Table 1:

TABLE 1

As can be seen from table 1, the rubber material for cleaning the mold in example 1 has a good effect of cleaning the mold and the inside of the mold is thoroughly cleaned, so that the appearance quality of the product can be maintained for a longer time after cleaning, thereby effectively improving the production efficiency.

Fig. 1 is a photograph of the surface of the rubber material after the mold was vulcanized and cleaned by the rubber material in example 1, and it can be seen that a large amount of sediment is adhered to the surface of the rubber material, which indicates that the rubber material has a good cleaning effect on the rubber seal mold.

Example 4

Wherein:

Preparing a silane coupling agent KH-550 modified white carbon black:

Adding the fumed silica into toluene under the nitrogen atmosphere for uniform dispersion, then adding a silane coupling agent KH-550, heating at 60-80 ℃ for reaction for 3 hours, cooling, filtering and drying after the reaction is finished, thus obtaining the silica; wherein the dosage of the silane coupling agent KH-550 is 80% of the mass of the fumed silica, and the proportion of the fumed silica to toluene is 1g:60mL.

Preparing hyperbranched polyester grafted white carbon black:

Adding white carbon black modified by a silane coupling agent KH-550 into dimethylbenzene under nitrogen atmosphere, dispersing uniformly, then adding p-toluenesulfonic acid, carrying out heating reflux reaction at 130-140 ℃, adding 2, 2-dimethylolpropionic acid in 4 batches in the reaction process, adding each batch for 25min at a time interval, cooling, filtering and drying after the reaction is finished, thus obtaining the catalyst; wherein the dosage of the p-toluenesulfonic acid is 0.15 percent of the mass of the white carbon black modified by the silane coupling agent KH-550, the total addition of the 2, 2-dimethylolpropionic acid is 40 percent of the mass of the white carbon black modified by the silane coupling agent KH-550, and the ratio of the white carbon black modified by the silane coupling agent KH-550 to the dimethylbenzene is 1g:300mL.

The preparation method of the rubber material for cleaning the mold comprises the following steps: mixing EPDM raw rubber, talcum powder, hyperbranched polyester grafted white carbon black and zeolite powder uniformly, mixing for 2-5min at 120-140 ℃, adding other raw materials, and mixing for 1-2min at 85-95 ℃ to obtain the modified EPDM.

Test example 2

The rubber materials of example 1 and example 4 were stored at 25.+ -. 5 ℃ and 50.+ -. 5% humidity for 6 months, and then the mold of the rubber seal ring was cleaned, the cleaning method was: and (3) placing the rubber material into a dirt rubber sealing ring mould, vulcanizing for 600 seconds at the temperature of 180 ℃, taking out the vulcanized rubber material, and observing the cleaning effect of the mould. The cleaned mould is continuously used for production, and the production conditions are as follows: 8h, producing 3500 sealing ring products per shift by each die, wherein the sealing ring products comprise HNBR and hydrogenated nitrile rubber three shifts per day; observing the days that the appearance of the sealing ring produced by the cleaned die is qualified, wherein the appearance qualification standard of the sealing ring is according to ISO3601-N level, and no obvious die dirt appearance defect exists; the results are shown in Table 2:

TABLE 2

As is clear from table 2, the rubber material for cleaning a mold in example 4 can maintain an excellent cleaning effect as compared with example 1, and is high in stability, and can ensure less volatilization or precipitation of the internal cleaning agent after storage for 6 months, thereby maintaining an excellent cleaning effect.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims

1. The rubber material for cleaning the mold is characterized by comprising the following raw materials in parts by mass: 100 parts of EPDM raw rubber, 15-25 parts of triethanolamine, 10-15 parts of isopropanolamine, 10-15 parts of emulsifier OP-10-15 parts of rubber self-cleaning agent ZJ-1 5-10 parts of talcum powder 30-50 parts, 10-15 parts of white carbon black, 3-5 parts of zeolite powder, 0.8-2 parts of vulcanizing agent, 0.5-1.5 parts of vulcanization accelerator, 2-5 parts of zinc oxide and 0.5-2 parts of lubricant;

The EPDM raw rubber is prepared from low-Mooney EPDM and high-Mooney EPDM according to the mass ratio of (20-40): (60-80); the Mooney viscosity of the low-Mooney EPDM under the ML (1+4) 125 ℃ test condition is 20-30MU, and the Mooney viscosity of the high-Mooney EPDM under the ML (1+4) 125 ℃ test condition is 60-80MU;

The rubber self-cleaning agent ZJ-1 is produced by Shanghai Maotong Industry Co., ltd.

2. The rubber material for mold cleaning according to claim 1, wherein the EPDM raw rubber has an ethylene content of 50 to 60wt% and the third monomer ENB has a content of 5 to 9wt%.

3. The rubber material for cleaning a mold according to claim 1, wherein the white carbon black is hyperbranched polyester grafted white carbon black.

4. The rubber material for cleaning a mold according to claim 3, wherein the preparation method of the hyperbranched polyester grafted white carbon black comprises the following steps: and (3) reacting the white carbon black modified by the silane coupling agent KH-550 with 2, 2-dimethylolpropionic acid under the catalysis of p-toluenesulfonic acid to obtain the hyperbranched polyester grafted white carbon black.

5. The rubber material for cleaning a mold according to claim 1, wherein the vulcanizing agent is sulfur.

6. The rubber material for mold cleaning according to claim 1, wherein the vulcanization accelerator is at least one of a vulcanization accelerator DM, a vulcanization accelerator TMTD, and a vulcanization accelerator MBTS.

7. The rubber material for cleaning a mold according to claim 1, wherein the lubricant is at least one of stearic acid, sodium stearate, calcium stearate, and oleamide.

8. A method for producing a rubber material for cleaning a mold according to any one of claims 1 to 7, comprising the steps of: mixing EPDM raw rubber, talcum powder, white carbon black and zeolite powder uniformly, mixing at 120-140 ℃ for 2-5min, adding other raw materials, and mixing at 85-95 ℃ for 1-2min to obtain the product.