KR102096516B1 - Manufacturing methods of police boots - Google Patents

Abstract

The present invention relates to a method of manufacturing police boots which provide excellent wearing sensation due to significantly reduced weight as well as improved mechanical properties compared to the conventional police boots. More specifically, the present invention relates to a method comprising: a fabric manufacturing step of manufacturing rubber sheet fabric having a certain thickness by mixing 1.5-2.5 parts by weight of a vulcanizing agent, 4-5 parts by weight of a rubber oxidizing agent, 3.5-4.5 parts by weight of a vulcanization accelerator, 5-6 parts by weight of an activator, 45-50 parts by weight of a filler, 1.5-2.5 parts by weight of an anti-aging agent, and 1.5-2.5 parts by weight of a polymer dispersant with respect to 100 parts by weight of a base material consisting of 40-45 parts by weight of natural rubber and 55-60 parts by weight of vinyl sheath rubber; a fabric cutting step of cutting the rubber sheet fabric as a part of the boots; a fabric attaching step of attaching the cut rubber sheet fabric to an inner layer fabric to form in the form of the boots; a reinforcing material bonding step of bonding a reinforcing material to an outer surface of the formed boots; a compressing step of strengthening the adhesion between the reinforcing material and the boots by compressing the boots in all directions; and a vulcanizing step of vulcanizing the natural rubber and vinyl sheath rubber by heating the boots in a heating furnace for 70-90 minutes at a temperature of 120-150 degrees.

Description

{Manufacturing methods of police boots}

The present invention relates to a method of manufacturing police boots, and more particularly, to a method of manufacturing police boots that provides excellent ignition feeling while simultaneously improving mechanical properties and significantly reducing weight compared to conventional police boots.

In general, in the case of injection boots made of polyvinyl chloride as materials, they are cheaper than rubber boots, have high productivity, and are used in fashion boots, sanitary boots, rain boots, etc. with excellent fashion characteristics.

However, in the case of polyvinyl chloride boots, it is difficult to apply to police boots requiring mechanical properties of a certain level or higher due to a problem that mechanical strength is significantly reduced compared to general rubber boots.

Republic of Korea Registered Patent Publication No. 10-0609406

The present invention is to solve the above problems, to improve the mechanical properties significantly, to provide a method for manufacturing a police boot of high physical properties.

The present invention relates to 1.5 to 2.5 parts by weight of a vulcanizing agent, 4 to 5 parts by weight of a rubber oxidizing agent, and 3.5 to 4.5 parts by weight of a vulcanizing accelerator based on 100 parts by weight of a base material comprising 40 to 45 parts by weight of natural rubber and 55 to 60 parts by weight of vinyl sheath rubber. And, 5 to 6 parts by weight of the activator, 45 to 50 parts by weight of the filler, 1.5 to 2.5 parts by weight of the anti-aging agent and 1.5 to 2.5 parts by weight of the polymer dispersant, a fabric manufacturing step for producing a rubber sheet fabric having a certain thickness, and the rubber Fabric cutting step of cutting the sheet fabric as a part of the boots, and attaching the cut rubber sheet fabric to the endothelial fabric, attaching the fabric to form in the form of boots, and a reinforcing material that adheres the reinforcing material to the outer surface of the formed boots Adhesion step, the compression step to strengthen the adhesion between the reinforcing material and the rain boots by compressing the boots in all directions, and putting the rain boots into the heating furnace within 120 At a temperature condition of 150 ℃ heated for 70 to 90 minutes and is characterized in that it comprises a vulcanization step of the vulcanized natural rubber and a vinyl-cis rubber.

In addition, preferably, in the fabric manufacturing step, the active agent is characterized by comprising a mixture of stearic acid (ST) and polyethylene glycol (Polyethylene glycol, PEG).

In addition, preferably, in the fabric manufacturing step, the vulcanization accelerator is dibenzothiazyl disulfide (MBTS), tetramethylthiuram monosulfide (TMTM), mercapto benzothiazole (Mercapto benzo) thiazole, MBT) and ethylene thiourea (Na22).

The present invention significantly reduces the weight compared to conventional boots by using a base material mixed with natural rubber and vinyl sheath rubber, but significantly improves the mechanical strength and can be applied to police boots requiring mechanical properties of a certain level or higher. A method for manufacturing rain boots can be provided.

1 is a view showing the police boots made in accordance with the present invention.
2 is a test report measuring the tensile strength and elongation of the police boots upper made in accordance with the present invention.
3 and 4 are analysis reports of police boots upper produced according to the present invention.

Hereinafter, the technical spirit of the present invention will be described in more detail with reference to the accompanying drawings.

The accompanying drawings are only examples shown in order to describe the technical spirit of the present invention in more detail, so the technical spirit of the present invention is not limited to the form of the accompanying drawings.

The present invention relates to a method of manufacturing a police boots that provides excellent ignition feeling by simultaneously reducing the weight while improving mechanical properties compared to the conventional police boots, fabric manufacturing step, fabric cutting step, fabric attaching step, reinforcing material adhesion step, compression It comprises a stage and a vulcanization stage.

First, the fabric manufacturing step is 1.5 to 2.5 parts by weight of a vulcanizing agent, 4 to 5 parts by weight of a rubber oxidizing agent, and 3.5 to 4.5 parts of a vulcanizing accelerator, based on 100 parts by weight of a base made of 40 to 45 parts by weight of natural rubber and 55 to 60 parts by weight of vinyl sheath rubber. It is a step of preparing a rubber sheet fabric having a certain thickness by mixing parts by weight, 5 to 6 parts by weight of an active agent, 45 to 50 parts by weight of a filler, 1.5 to 2.5 parts by weight of an anti-aging agent and 1.5 to 2.5 parts by weight of a polymer dispersant.

In the case of natural rubber, it has good compatibility with other synthetic rubbers, and mechanical properties including tensile strength and elongation, wear resistance and dynamic properties are superior to other synthetic rubbers, but has a disadvantage of high price. The natural rubber is blended with 40 to 45 parts by weight based on parts by weight.

More specifically, when the blending ratio of the natural rubber is less than 40 parts by weight, the mechanical properties, abrasion resistance and dynamic properties may be weakened as the content of the natural rubber is lowered, while the blending ratio of the natural rubber is 45 weight. When the amount is exceeded, the weight per foot of the police boots is greatly increased, and thus an excellent ignition feeling cannot be provided, and the production cost is increased.

In addition, it is preferred that the natural rubber used in the present invention is a grade 3 natural rubber of RSS (Ribbed smoked sheet).

In the case of vinyl-sheath rubber (VCR), it is a rubber-resin composite, and not a reinforcement by a filler, but a resin in the raw rubber itself is formed in a short fiber shape during polymerization, and can serve as a reinforcing material, and has a specific gravity compared to other synthetic rubbers. It has low characteristics.

And, based on 100 parts by weight of the base, the vinyl sheath rubber is blended with 55 to 60 parts by weight, and accordingly, the present invention is a blend of vinyl sheath rubber as a main material, thereby significantly reducing the weight per foot of the police boots and providing an excellent ignition feeling. Can provide

In addition, when the mixing ratio of the vinyl sheath rubber is less than 55 parts by weight. While the effect as the above-described reinforcing material cannot be properly exhibited, on the other hand, when the compounding ratio of the vinyl sheath rubber exceeds 60 parts by weight, too many resin components may occur, which may cause difficulties in processing.

The vulcanizing agent used in the present invention serves to crosslink the rubber used as the substrate, and one or more selected from the group consisting of organic peroxides, sulfur, polyamines, thioureas, and mercaptan triazines and mixtures thereof can be used. You can.

Further, it is preferable that the vulcanizing agent is used in an amount of 1.5 to 2.5 parts by weight based on 100 parts by weight of the substrate in consideration of the vulcanization temperature and time.

When the compounding ratio of the vulcanizing agent is less than 1.5 parts by weight, the abrasion resistance of the police boots finally produced due to uncrosslinking occurs, whereas, when the compounding ratio of the vulcanizing agent exceeds 2.5 parts by weight, the police are over-crosslinked. The appearance of the boots tends to twist.

The rubber oxidizing agent used in the present invention is a substance having an oxidizing effect such as imparting oxygen or depriving hydrogen, and is directly involved in the oxidation reaction, and can promote the chemical reaction of the rubber, the vulcanizing agent, and the vulcanizing accelerator.

The rubber oxidizer is preferably used zinc oxide (ZnO, Zinc Oxide).

Specifically, in the case of zinc oxide, it can be used not only as a natural rubber but also as an accelerating activator for synthetic rubber, and has a characteristic of providing heat resistance to rubber due to its good thermal conductivity.

Therefore, the present invention can promote the vulcanization reaction by mixing zinc oxide and improve the heat resistance of the police boots finally produced.

And it is preferable that 4 to 5 parts by weight of the rubber oxidizing agent is used with respect to 100 parts by weight of the substrate, and when the mixing ratio of the rubber oxidizing agent is less than 4 parts by weight, the role of the rubber oxidizing agent is negligible to promote the chemical reaction of the rubber, the vulcanizing agent and the vulcanizing accelerator. On the other hand, when the compounding ratio of the rubber oxidizer is more than 5 parts by weight, it is preferable that the rubber oxidizer is mixed within the above range because there is a possibility that mechanical properties including tensile strength and elongation of the police boots finally produced may be deteriorated.

The vulcanization accelerator used in the present invention is used in combination with a vulcanizing agent to promote a vulcanization reaction, and it is preferable to use 3.5 to 4.5 parts by weight based on 100 parts by weight of the substrate in consideration of vulcanization time.

When the blending ratio of the vulcanization accelerator is less than 3.5 parts by weight, polysulfur bonding cannot be achieved because an effective vulcanization system is not formed, whereas when the blending ratio of the vulcanization accelerator exceeds 4.5 parts by weight, process defects due to scorch may occur. , If used excessively, there is a problem in that the molding time is shortened due to short processing time.

In addition, the vulcanization accelerator is dibenzothiazyl disulfide (MBTS), tetramethylthiuram monosulfide (TMTM), mercapto benzo thiazole (MBT) and ethylene thiourea (Ethylene) It is preferred that a mixture of thiourea, Na22) is used.

The vulcanization accelerators described above are compatible with each other, and when used in combination, have excellent acceleration compared to single use, thus shortening the vulcanization time and having low-temperature vulcanization. In addition, the total amount of the vulcanization accelerator is reduced, thereby reducing the unit cost.

In addition, the combination of a thiazole-based vulcanization accelerator and a thiuram-based vulcanization accelerator improves tensile strength and induces C-S-C bonding, thereby improving the dynamic properties of natural rubber and vinyl sheath rubber for continuous stress deformation.

More specifically, 36 to 37 parts by weight of dibenzothiazole disulfide, 2 to 3 parts by weight of tetramethylthiuram monosulfide, 10 to 11 parts by weight of mercapto benzothiazole and ethylene thio relative to 100 parts by weight of the vulcanization accelerator It is preferred that 50 to 51 parts by weight of urea is used in combination.

In the case of dibenzothiazole disulfide, which is a thiazole-based vulcanization accelerator, and mercapto benzo thiazole, the mixing ratio of dibenzothiazole disulfide is less than 36 as 100 parts by weight of the substrate as a long scorch time and a relatively fast vulcanization rate. And, when the blending ratio of mercapto benzothiazole is less than 10, the vulcanization rate is too delayed, or the vulcanization is not promoted to degrade physical properties, while the blending ratio of dibenzothiazole disulfide relative to 100 parts by weight of the substrate When it is more than 37, and the mercapto benzothiazole compounding ratio is more than 11, the vulcanization rate is too fast to control the vulcanization rate, resulting in deterioration in formability, and the desired physical properties cannot be obtained due to overvulcanization.

In addition, in the case of tetramethylthiuram monosulfide, which is a thiuram-based vulcanization accelerator, as a super-strong accelerator, when the blending ratio is less than 2 parts by weight, there is a problem of deterioration in vulcanization efficiency and vulcanization rate, while when the blending ratio is more than 3 parts by weight , C-Sx-C bonds with weaker binding energy than CSC bonds with strong binding energy and CS bonds may induce the dynamic properties and mechanical properties of the police boots that are finally produced.

In addition, in the case of the thiourea-based vulcanization accelerator, ethylene thiourea, not only increases the vulcanization rate, but also improves the vulcanization density and improves the scorch resistance and adhesion between the substrate compositions. Due to the electronic effect between the double bonds, it serves to further activate the reaction with the vulcanizing agent, that is, sulfur.

That is, when the blending ratio of the ethylene thiourea is less than 50 parts by weight, the role of the vulcanization accelerator is negligible to realize the above-described effect, whereas when the blending ratio is more than 51 parts by weight, the physical properties of the police boots that are finally produced are lowered. There is a fear to do.

The active agent used in the present invention allows the substrate to be in an emulsion state, and preferably 5 to 6 parts by weight based on 100 parts by weight of the substrate.

When the blending ratio of the active agent is less than 5 parts by weight, emulsification is difficult, whereas when the blending ratio of the active agent exceeds 6 parts by weight, a problem in that the vulcanization time is prolonged may occur.

In addition, the active agent is preferably a mixture of stearic acid (ST) and polyethylene glycol (Polyethylene glycol, PEG) is used.

In detail, it is preferable that 16 to 18 parts by weight of stearic acid and 82 to 84 parts by weight of polyethylene glycol are mixed with respect to 100 parts by weight of the active agent.

In the case of stearic acid, it is an unsaturated fatty acid that provides proper hardness and shape retention. The urea to have, if the blending ratio of stearic acid is less than 16 parts by weight, or exceeds 18 parts by weight, there is a fear that formability may be deteriorated.

In the case of polyethylene glycol, it is not only excellent in miscibility with the stearic acid as a nonionic activator, but also has an advantage of excellent activity, and when the blending ratio of polyethylene glycol is less than 82 parts by weight, the dispersion and mixing power of the substrate may be insufficient. On the other hand, when the blending ratio of polyethylene glycol exceeds 84 parts by weight, the relative amount of stearic acid is lowered and there is a fear that the moldability is lowered.

The filler used in the present invention may use one or more selected from the group consisting of carbon black master batch (CMB) white carbon, hard coal, and mixtures thereof, and the filler is 100 parts by weight of the substrate. It is preferred that 45 to 50 parts by weight are used.

When the blending ratio of the filler is less than 45 parts by weight, the abrasion resistance of the police boots may not be deteriorated or the surface may not be sufficiently modified, whereas when the blending ratio of the filler exceeds 50 parts by weight, there is a fear that workability may be deteriorated. Do not.

The anti-aging agent used in the present invention prevents aging of police boots, suppresses contamination, etc., and as the anti-aging agent, one or more selected from the group consisting of amine-based anti-aging agents, phenol-based anti-aging agents and mixtures thereof can be used. However, it is preferred that styrenated phenol (SP-S) is used.

In the case of styrenated phenol, it can be used in the combination of natural and synthetic rubbers, and is an anti-aging agent that has good heat resistance and bending resistance and is not affected by a vulcanization accelerator.

Accordingly, the present invention can prevent aging by mixing styrenated phenol and at the same time give heat resistance and flex resistance to the police boots that are finally produced.

In addition, it is preferable that the anti-aging agent is used in an amount of 1.5 to 2.5 parts by weight based on 100 parts by weight of the substrate in consideration of the anti-aging effect and contamination, and if the blending ratio of the anti-aging agent is less than 1.5 parts by weight, a sufficient anti-aging effect is not realized. On the other hand, when the blending ratio of the anti-aging agent exceeds 2.5 parts by weight, the physical properties of the rubber used as the substrate may be deteriorated, resulting in white swelling blooming around the rubber after molding.

The polymer dispersant used in the present invention improves homogeneity when mixing rubber substrates having different polarities and viscosities, improves the dispersibility of the substrate, and smoothly induces kneading operations between the substrate and the additives, thereby acting as a bridge between the substrate and the additives. Performed, it is preferred that 1.5 to 2.5 parts by weight based on 100 parts by weight of the substrate.

Specifically, when the blending ratio of the polymer dispersant is less than 1.5 parts by weight, the role of the polymer dispersant is insignificant, so that the smooth dispersion of the substrate is not achieved, and thus the above-described homogeneity improvement and dispersibility improvement effect is not realized, whereas the blending ratio of the polymer dispersant is 2.5 When it exceeds the weight part, the molecules of the dispersing agent may associate with each other to form spherical or rod-shaped micelles, which may cause a problem of instability of the substrate particles.

That is, as described above, in the fabric manufacturing step, natural rubber, vinyl sheath rubber and various additives are kneaded, and a sheet-shaped rubber sheet fabric having a constant thickness is produced through a calendar operation.

The produced rubber sheet fabric is applied to the upper portion of the police boots, see FIG. 1.

1 is a view showing the police boots made in accordance with the present invention.

Next, the fabric cutting step is a step of cutting each of the rubber sheet fabric into parts of boots including a body rubber and a waterproof window.

The fabric attaching step is a step of attaching the cut rubber sheet fabric to the endothelial fabric and forming it in the form of rain boots.

More specifically, an endothelial fabric is covered on the outer circumferential surface of a mold having a rain boots shape, and an adhesive is applied to the outer surface of the fabric while the fabric is covered with the mold and dried at room temperature so that the rubber sheet fabric adheres smoothly to the outer surface of the fabric. Prepare.

And, by attaching the cut rubber sheet fabric to the outer surface of the fabric can be formed to have the form of rain boots.

In addition, it is preferred that the fabric for endothelial use of polyester-based synthetic fibers, and the polyester-based synthetic fibers have better durability than other synthetic fibers, and are not well formed in shape deformation, and recover when wet. It is suitable as an endothelial fabric due to its higher degree of drying and faster drying.

In addition, the polyester-based synthetic fiber has a tensile strength of 50MPa in the longitudinal direction, 9MPa or more in the width direction, a tensile strength of 20% in the longitudinal direction, 150% or more in the width direction, and a bursting strength of 830kgf / cm2 or more, satisfying the requirements of police boots. It is preferred that the fibers being used are used.

The step of adhering the reinforcing material is a step of completing the appearance of the boot by adhering a reinforcing material including a nose wrap rubber, a sole and a reinforcing tape rubber to the outer surface of the formed boots.

The compression step is a step of strengthening the adhesion between the reinforcing material and the boots by compressing the boots in all directions.

More specifically, the compressing step is to press the reinforcement tape rubber adhered to the outer surface of the boots with a roller so that there are no unbonded areas, and the boots are compressed in all directions to enhance the adhesion between the reinforcement and the boots.

After the compression step, an enamel coating step of applying enamel to the outer surface of the rain boots may be further performed, and the enamel coating step smoothly forms the surface of the rain boots, as well as deterioration of physical properties due to chemical effects including yellowing and hydrolysis. It has the effect of preventing.

The vulcanizing step is a step of vulcanizing the natural rubber and the vinyl sheath rubber by heating the rain boots at a temperature of 120 to 150 ° C. for 70 to 90 minutes by putting the boots into a heating furnace.

The vulcanization conditions are vulcanization conditions according to the type and mixing ratio of the base material, vulcanizing agent and vulcanization accelerator, and more specifically, the temperature conditions promote the reaction between the base material in which natural rubber and vinyl sheath are mixed and the vulcanizing agent, thereby vulcanizing time. Not only can it be shortened, but as an optimal condition to improve the physical properties of the final vulcanized product, the applicant undergoes a number of experiments and undergoes sufficient vulcanization reaction to ensure excellent physical properties of the first vulcanized product. It is meaningful as a threshold derived as an optimal ratio.

That is, when the vulcanization step is performed in a temperature condition of less than 120 ° C for less than 70 minutes, sufficient vulcanization between the substrate and the vulcanizing agent may not be achieved, resulting in poor elasticity and deterioration in physical properties. When the temperature exceeds 150 ° C and exceeds 90 minutes, there is a problem in that the police boots that are finally produced are deteriorated due to the over cure, resulting in a decrease in surface light or a decrease in mechanical properties.

After the vulcanization step is completed, the boots are separated from the mold, and after washing the surface, the quality is checked through quality inspection including a water pressure test, and the final packaging is completed when the quality is met.

This completes the description of the method for manufacturing police boots according to the present invention.

<Experimental Example 1>

Hereinafter, the present invention will be described in detail based on Experimental Example 1.

The following [Table 1] is an example and a comparative example according to the present invention, the content is indicated by weight (unit: g), and is not limited to the examples.

division Example Comparative Example 1 Comparative Example 2 materials Natural rubber (RSS Level 3) 15,000 - 17,500 Vinyl sheath rubber (VCR) 20,000 35,000 17,500 Vulcanizing agent Sulfur (S) 700 700 700 Rubber oxidizer ZnO, Zinc Oxide 1,500 1,500 1,500 Activator Stearic acid (ST) 350 350 350 Polyethylene glycol
(Polyethylene glycol, PEG) 1700 1700 1700 Vulcanization accelerator Dibenzothiazole disulfide
(Dibenzothiazyl disulfide, MBTS) 500 500 500 Tetramethylthiuram monosulfide
(Tetramethylthiuram monosulfide, TMTM) 30 30 30 Mercapto benzothiazole
(Mercapto benzo thiazole, MBT) 150 150 150 Ethylene thiourea
(Ethylene thiourea, Na22) 700 700 700 Filler White carbon 17,000 17,000 17,000 Anti-aging agent Styreneate diphenol
(Styrenated phenol, SP-S) 700 700 700 Polymer dispersant 60NS
(Manufacturer_STRUKTOL) 700 700 700

As disclosed in Table 1 above, Examples, Comparative Examples 1 and 2, but the content of the substrate is different, the vulcanization step was performed under the same conditions for 80 minutes at a temperature condition of 140 ℃.

Physical properties of the police boots specimens prepared by the above Examples and Comparative Examples 1 and 2 were evaluated according to the following test methods, and the results are shown in [Table 2].

1) Tensile strength: Measured using KS M ISO 1798: 2008 method.

2) Elongation: It was measured using KS M 6518: 2016 method.

Evaluation items unit Example Comparative Example 1 Comparative Example 2 The tensile strength MPa 11.6 8.4 9.1 Elongation % 513 370 420

For police boots (knee boots) upper, physical properties of tensile strength of 9.5 MPa or higher and elongation of 400% or higher are required,

As shown in [Table 2] and FIG. 2, the embodiment according to the present invention showed a result of satisfying the requirements of police boots with a tensile strength of 11.6 Mpa and an elongation of 513%, as well as a comparative example of an existing material. It showed excellent mechanical strength compared to 1 and Comparative Example 2.

In addition, as shown in Figures 3 and 4, the embodiment according to the present invention is proved to be a product that meets the safety standards as no harmful chemicals are detected.

In conclusion, the police boots produced by the present invention have improved mechanical strength compared to the existing materials, and at the same time, by mixing vinyl sheath rubber with a lower specific gravity than other synthetic rubbers as the main material, the weight per family is greatly increased compared to the existing materials. It can be reduced to provide excellent ignition.

As described above, the method for manufacturing police boots according to the present invention has been described through the above preferred embodiment, and its superiority has been confirmed, but those skilled in the art will depart from the spirit and scope of the present invention as set forth in the claims below. It will be understood that various modifications and changes may be made to the present invention without departing from the scope.

Claims (3)

Vulcanizing agent 1.5 to 2.5 parts by weight, rubber oxidizing agent 4 to 5 parts by weight, vulcanization accelerator 3.5 to 4.5 parts by weight, activator 5 to 40 parts by weight of natural rubber and 100 parts by weight of vinylsys rubber 55 to 60 parts by weight A fabric manufacturing step of mixing 6 parts by weight, 45 to 50 parts by weight of a filler, 1.5 to 2.5 parts by weight of an anti-aging agent, and 1.5 to 2.5 parts by weight of a polymer dispersant to prepare a rubber sheet fabric having a certain thickness;
A fabric cutting step of cutting the rubber sheet fabric into a part of boots;
Attaching the cut rubber sheet fabric to an endothelial fabric, which is a polyester-based synthetic fiber, and attaching the fabric in the form of rain boots;
A reinforcing material adhesion step of adhering a reinforcing material to the outer surface of the formed boots;
Compression step to strengthen the adhesion between the reinforcing material and the boots by compressing the boots in all directions;
An enamel coating step of applying enamel to the outer surface of the boots subjected to the compression step; And
Including the vulcanization step of vulcanizing the natural rubber and vinyl sheath rubber by heating the rain boots at a temperature condition of 120 to 150 ° C. for 70 to 90 minutes by putting the boots into a heating furnace.
In the fabric manufacturing step,
The active agent is mixed with stearic acid (ST) 16 to 18 parts by weight and polyethylene glycol (PEG) 82 to 84 parts by weight with respect to 100 parts by weight of the active agent,
The vulcanization accelerator, Dibenzothiazyl disulfide (MBTS) 36 to 37 parts by weight, tetramethylthiuram monosulfide (TMTM) 2 to 3 parts by weight, 100 parts by weight of the vulcanization accelerator, mer Capto benzo thiazole (Mercapto benzo thiazole, MBT) 10 to 11 parts by weight and ethylene thiourea (Ethylene thiourea, Na22) 50 to 51 parts by weight of the police boots manufacturing method characterized in that mixed. delete delete

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