Sole rubber for oil-proof shoes and preparation and application methods thereof

Abstract

The invention discloses sole rubber for oil-proof shoes as well as a preparation method and an application method of the sole rubber. The rubber is prepared from the following raw materials in parts by weight: 10-15 parts of natural rubber, 85-90 parts of chloroprene rubber, 3.5-4.5 parts of a vulcanizing agent, 0.8-1.2 parts of a vulcanization accelerator, 7-9 parts of a vulcanization activator, 0.4-0.8 part of an anti-aging agent CD, 8-12 parts of solid coumarone, 12-16 parts of a softening agent and 58-62 parts of N220 carbon black. According to the present invention, the external force resistance of the rubber is enhanced, the wear resistance of the rubber is improved, the service life of the outsole is substantially prolonged, the requirements of the service life and the oil resistance are fundamentally met, and the rubber compound has advantages of rapid vulcanization, excellent processing property, simple operation and the like in the sole manufacturing process. The sole is made of chloroprene rubber as a main material, the oil resistance requirement is met, the oil-proof requirement of shoes in an oil environment is met, and the service life of the rubber sole is prolonged by more than two times. And the wearing comfort performance of the rubber sole of the shoe is well ensured.

Description

Technical Field

[0001] The invention relates to a sole rubber for oil-proof shoes and a preparation and application method thereof, belonging to the technical field of shoemaking. Background Art

[0002] Generally speaking, the oil resistance of the rubber outsole of rubber shoes is not high, and such rubber shoes cannot meet the requirements of wearing in oily environments. Due to the influence of factors such as rubber aging, production conditions and manufacturing process limitations, the service life of rubber soles in oily environments is not long and may cause slips.

[0003] The factors that affect the oil resistance of the outsole of rubber shoes mainly include three aspects: rubber formula design, rubber processing technology and sole vulcanization technology.

[0004] From the perspective of formula design, the vulcanization depth of rubber is too high, and oil-resistant rubber is not conducive to molding and bonding, making it difficult to successfully produce oil-resistant rubber shoes, which limits the richness of product styles.

[0005] However, in general, when CR121 chloroprene rubber or SN12 chloroprene rubber is used to make oil-resistant rubber for shoes, due to the characteristics of 12-type chloroprene rubber, the rubber is extremely affected by the temperature of the rubber mixing equipment during the rubber refining process, causing the rubber to stick to the roller, which seriously restricts the normality of the rubber molding process. At the same time, 12-type chloroprene rubber shrinks severely, and the pattern of the rubber sheet produced by its mixed rubber is severely deformed due to the shrinkage of the rubber, which greatly affects the appearance quality of the rubber shoes. The company urgently needs an oil-resistant shoe rubber with clear patterns, stable process and non-stick rollers. In order to improve the appearance quality and production efficiency of oil-resistant rubber shoes. Summary of the invention

[0006] The purpose of the present invention is to provide a sole rubber for oil-proof shoes and a preparation and application method thereof. The oil resistance, process performance and appearance quality of the sole of the rubber shoe are improved by selecting raw rubber, designing the rubber formula of the sole of the rubber shoe, the processing conditions of the sole of the rubber shoe and the vulcanization process of the sole, so as to solve the problem that the existing oil-resistant shoe rubber has poor process performance and poor appearance quality.

[0007] The technical solution of the present invention is as follows: a sole rubber for oil-proof shoes is prepared from the following raw materials in parts by weight: 10-15 parts of natural rubber, 85-90 parts of chloroprene rubber, 3.5-4.5 parts of vulcanizing agent, 0.8-1.2 parts of vulcanization accelerator, 7-9 parts of vulcanization activator, 0.4-0.8 parts of antioxidant CD, 8-12 parts of solid coumarone, 12-16 parts of softener and 58-62 parts of N220 carbon black.

[0008] The aforementioned oil-proof shoe sole rubber is made of the following raw materials in parts by weight: 13 parts of natural rubber, 87 parts of chloroprene rubber, 4.0 parts of vulcanizing agent, 1.0 parts of vulcanization accelerator, 8 parts of vulcanization activator, 0.6 parts of antioxidant CD, 10 parts of solid coumarone, 16 parts of softener, and 60 parts of N220 carbon black.

[0009] In the aforementioned oil-proof shoe sole rubber, the natural rubber is 2# standard rubber; the model of the chloroprene rubber is CR322; the vulcanizing agent is light magnesium oxide; the vulcanization accelerator is composed of 0.2 parts of accelerator DM and 0.8 parts of accelerator NA-22 per 1.0 parts of the vulcanization accelerator; the activator is composed of 4 parts of nano zinc oxide and 4 parts of stearic acid per 8 parts of the vulcanization activator; and the softener is composed of 6 parts of 5# spindle oil and 10 parts of dibutyl phthalate per 16 parts of the softener.

[0010] A method for preparing oil-proof shoe sole rubber comprises the following steps:

[0011] (1) Ingredients: Measure N220 carbon black as a coarse material; put a softener in an open barrel to obtain a softener; mix a vulcanization accelerator, a vulcanization activator, an antioxidant, and solid coumarone together to obtain a medium material;

[0012] (2) Mixing: natural rubber, chloroprene rubber, medium material and half of N220 carbon black are put into a rubber mixer and mixed at a temperature of 85-115°C and a pressure of 0.39-0.40 MPa for 1-1.5 minutes, then the remaining N220 carbon black is added and mixed for 5'50"-6'20", then a softener is added and mixed evenly, the material is discharged to a flat mill, the temperature is lowered, a vulcanizing agent is added and mixed to obtain a mixed rubber, the mixed rubber is sliced ​​and cooled to obtain product A; the starting point of vulcanization of product A under the condition of 143°C flat plate vulcanization is 2'30"-3'10";

[0013] (4) Heat refining and molding: After product A is evenly heat refining at 45-55°C, it is rolled by a patterned roller, cooled, and then cut into rubber sheets for oil-proof shoe soles using a sole punching die.

[0014] The invention discloses an application method of sole rubber for oil-proof shoes. The adhesive surface of a rubber sheet of sole rubber for oil-proof shoes is brushed with chloroprene glue, dried naturally for 2 hours, and then attached to the upper of a shoe last, assembled with an oil-proof rubber sheet to form a rubber shoe, and then vulcanized. The vulcanization molding process is mixed gas hot vulcanization, the vulcanization temperature is 136-139°C, the working pressure is 0.36-0.39MPa, and the vulcanization time is 30 minutes.

[0015] Beneficial effects of the present invention: Compared with the prior art, the rubber compound formula and preparation method of the rubber sole for oil-proof shoes proposed by the present invention enhance the rubber's own ability to resist external forces and improve the rubber's wear resistance, greatly increase the life of the outsole, and fundamentally achieve the service life and oil resistance requirements. The mixed rubber in the present invention has the advantages of rapid vulcanization, excellent process performance, and simple operation in the process of manufacturing the sole. The present invention uses chloroprene rubber as the main material to make the sole, which meets the oil resistance requirements (the mass increase percentage after immersion in 46# engine oil for 24 hours is less than 2.5%), meets the oil resistance requirements of shoes in an oily environment, and increases the life of the rubber sole by more than 2 times. The wearing comfort performance of the rubber sole of the shoe is well guaranteed. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the embodiments, but they are not intended to limit the present invention.

[0017] Embodiment 1 of the present invention: A sole rubber for oil-proof shoes is made of the following raw materials in parts by weight: 13 parts of natural rubber, 87 parts of chloroprene rubber, 4.0 parts of vulcanizing agent, 1.0 parts of vulcanization accelerator, 8 parts of vulcanization activator, 0.6 parts of antioxidant CD, 10 parts of solid coumarone, 16 parts of softener, and 60 parts of N220 carbon black.

[0018] Embodiment 2 of the present invention: A sole rubber for oil-proof shoes is made of the following raw materials in parts by weight: 10 parts of natural rubber, 85 parts of chloroprene rubber, 3.5 parts of vulcanizing agent, 0.8 parts of vulcanization accelerator, 7 parts of vulcanization activator, 0.4 parts of antioxidant CD, 8 parts of solid coumarone, 12 parts of softener, and 58 parts of N220 carbon black.

[0019] Embodiment 3 of the present invention: A sole rubber for oil-proof shoes is made from the following raw materials in parts by weight: 15 parts of natural rubber, 90 parts of chloroprene rubber, 4.5 parts of vulcanizing agent, 1.2 parts of vulcanization accelerator, 9 parts of vulcanization activator, 0.8 parts of antioxidant CD, 12 parts of solid coumarone, 16 parts of softener, and 62 parts of N220 carbon black.

[0020] Embodiment 4 of the present invention: A sole rubber for oil-proof shoes is made from the following raw materials in parts by weight: 12 parts of natural rubber, 86 parts of chloroprene rubber, 3.8 parts of vulcanizing agent, 0.9 parts of vulcanization accelerator, 8 parts of vulcanization activator, 0.5 parts of antioxidant CD, 9 parts of solid coumarone, 13 parts of softener, and 59 parts of N220 carbon black.

[0021] Embodiment 5 of the present invention: A sole rubber for oil-proof shoes is made from the following raw materials in parts by weight: 14 parts of natural rubber, 88 parts of chloroprene rubber, 4.2 parts of vulcanizing agent, 1.1 parts of vulcanization accelerator, 8 parts of vulcanization activator, 0.7 parts of antioxidant CD, 11 parts of solid coumarone, 15 parts of softener, and 61 parts of N220 carbon black.

[0022] In the above embodiment, the standard rubber (natural rubber) is 2# standard rubber; the model of the chloroprene rubber is CR322; the vulcanizing agent is light magnesium oxide; the vulcanization accelerator is composed of 0.2 parts of accelerator DM and 0.8 parts of accelerator NA-22 per 1.0 parts of vulcanization accelerator; the activator is composed of 4 parts of nano zinc oxide and 4 parts of stearic acid per 8 parts of vulcanization activator; the softener is composed of 6 parts of 5# spindle oil and 10 parts of dibutyl phthalate per 16 parts of softener.

[0023] The method for preparing the oil-proof shoe sole rubber of the above embodiment comprises the following steps:

[0024] (1) Ingredients: Measure N220 carbon black as a coarse material; put a softener in an open barrel to obtain a softener; mix a vulcanization accelerator, a vulcanization activator, an antioxidant, and solid coumarone together to obtain a medium material;

[0025] (2) Mixing: natural rubber, chloroprene rubber, medium material and half of N220 carbon black are put into a rubber mixer and mixed at a temperature of 85-115°C and a pressure of 0.39-0.40 MPa for 1-1.5 minutes, then the remaining N220 carbon black is added and mixed for 5'50"-6'20", then a softener is added and mixed evenly, the material is discharged to a flat mill, the temperature is lowered, a vulcanizing agent is added and mixed to obtain a mixed rubber, the mixed rubber is sliced ​​and cooled to obtain product A; the starting point of vulcanization of product A under the condition of 143°C flat plate vulcanization is 2'30"-3'10";

[0026] (4) Heat refining and molding: After product A is evenly heat-refined at 45-55°C, it is rolled by a patterned roller, cooled, and then cut into rubber sheets for oil-proof shoe soles using a sole punching die.

[0027] During the use of the prepared oil-proof shoe sole rubber, the adhesive surface of the oil-proof shoe sole rubber rubber sheet is brushed with chloroprene glue, dried naturally for 2 hours, and then attached to the upper of the upper shoe last, and assembled with the oil-proof surrounding rubber sheet to form a rubber shoe. The rubber shoe is then vulcanized, and the vulcanization molding process is mixed gas hot vulcanization, the vulcanization temperature is 136-139°C, the working pressure is 0.36-0.39MPa, and the vulcanization time is 30 minutes.

[0028] In order to further verify the effect of the present invention, the following experiments were conducted, and the experimental data are shown in Tables 1 and 2.

[0029] Research on raw material formula

[0030] Table 1

[0031]

[0032]

[0033] Table 1 continued

[0034]

[0035]

[0036] It can be seen from Table 1 that the formula "13 parts of natural rubber (2# standard rubber), 87 parts of chloroprene rubber (CR322), 4.0 parts of light magnesium oxide, 1.0 parts of vulcanization accelerator, 8 parts of vulcanization activator, 0.6 parts of antioxidant CD, 10 parts of solid coumarone, 16 parts of softener (including 6 parts of 5# spindle oil and 10 parts of dibutyl phthalate) and 60 parts of N220 carbon black" has the best physical properties.

[0037] Study on preparation method

[0038] 1. Methods

[0039] The preparation of rubber soles is generally divided into four steps: plasticizing, mixing, cutting, and sole making. In this process, plasticizing effect and mixing time are the main parameters affecting various properties.

[0040] (1) Mixing process research:

[0041] Table 2 Effect of mixing time on sole wear and oil resistance

[0042]

[0043]

[0044] It can be concluded from Table 2 that in the mixing process, the mixing time of the plasticized rubber and the masterbatch before adding carbon black is preferably 1 to 1.5 minutes, and when the net pressing time of carbon black is between 6'00" and 6'20", the wear performance and oil resistance of the sole are the best.

[0045] in conclusion

[0046] (1) The sole rubber adopts the plasticizing and mixing process to ensure wear resistance and oil resistance.

[0047] (2) The key time for mixing is to control the mixing time of the plasticized rubber and the intermediate material before adding carbon black, which should be 1 to 1.5 minutes, and the net pressing time for carbon black should be between 6'00" and 6'20".

[0048] Research on vulcanization process

[0049] 1. Methods

[0050] The rubber sheets for oil-proof soles produced under the same process conditions were used to make rubber shoes, and then vulcanized once in a steamer. The vulcanization molding process was mixed gas hot vulcanization, the vulcanization temperature was 136-139℃, the working pressure was 0.36-0.39MPa, and the vulcanization time was 30 minutes. The oil resistance performance index was compared and tested.

[0051] 2. Raw materials and equipment

[0052] (1) Raw materials: for making vulcanized soles.

[0053] (2) Equipment: A mixed gas vulcanization tank that uses air and water vapor as the vulcanization medium.

[0054] 3. Experimental data

[0055] Table 3 Effect of vulcanization molding process on oil resistance

[0056]

[0057] From Table 3, it can be seen that the oil resistance data is no higher than 2.5% when the vulcanization temperature of the steam tank is between 136 and 139°C, ensuring that the oil resistance performance meets the design requirements.

Claims

1. A rubber sole for oil-proof shoes, characterized in that: The invention is prepared from the following raw materials in parts by weight: 10-15 parts of natural rubber, 85-90 parts of chloroprene rubber, 3.5-4.5 parts of vulcanizing agent, 0.8-1.2 parts of vulcanization accelerator, 7-9 parts of vulcanization activator, 0.4-0.8 parts of antioxidant CD, 8-12 parts of solid coumarone, 12-16 parts of softener and 58-62 parts of N220 carbon black.

2. The oil-proof shoe sole rubber according to claim 1, characterized in that: The invention is prepared from the following raw materials in parts by weight: 13 parts of natural rubber, 87 parts of chloroprene rubber, 4.0 parts of vulcanizing agent, 1.0 parts of vulcanization accelerator, 8 parts of vulcanization activator, 0.6 parts of antioxidant CD, 10 parts of solid coumarone, 16 parts of softener and 60 parts of N220 carbon black.

3. The oil-proof shoe sole rubber according to claim 1 or 2, characterized in that: The natural rubber is 2# standard rubber; the model of the chloroprene rubber is CR322; the vulcanizer is light magnesium oxide; the vulcanization accelerator is composed of 0.2 parts of accelerator DM and 0.8 parts of accelerator NA-22 per 1.0 parts of the vulcanization accelerator; the activator is composed of 4 parts of nano zinc oxide and 4 parts of stearic acid per 8 parts of the vulcanization activator; and the softener is composed of 6 parts of 5# spindle oil and 10 parts of dibutyl phthalate per 16 parts of the softener.

4. A method for preparing a sole rubber for oil-proof shoes according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Ingredients: Measure N220 carbon black as a coarse material; put a softener in an open barrel to obtain a softener; mix a vulcanization accelerator, a vulcanization activator, an antioxidant, and solid coumarone together to obtain a medium material; (2) Mixing: natural rubber, chloroprene rubber, medium material and half of N220 carbon black are put into a rubber mixer and mixed at a temperature of 85-115°C and a pressure of 0.39-0.40 MPa for 1-1.5 minutes, then the remaining N220 carbon black is added and mixed for 5'50"-6'20", then a softener is added and mixed evenly, the material is discharged to a flat mill, the temperature is lowered, a vulcanizing agent is added and mixed to obtain a mixed rubber, the mixed rubber is sliced ​​and cooled to obtain product A; the starting point of vulcanization of product A under the condition of 143°C flat plate vulcanization is 2'30"-3'10"; (4) Heat refining and molding: After product A is evenly heat refining at 45-55°C, it is rolled by a patterned roller, cooled, and then cut into rubber sheets for oil-proof shoe soles using a sole punching die.

5. The method for applying the oil-proof shoe sole rubber according to claim 4, characterized in that: Brush the adhesive surface of the rubber sheet of the sole of the oil-proof shoe with chloroprene glue, dry it naturally for 2 hours, and then stick it on the upper of the upper shoe last, assemble it with the oil-proof rubber sheet to form a rubber shoe, and then vulcanize the rubber shoe. The vulcanization molding process is mixed gas hot vulcanization, the vulcanization temperature is 136-139℃, the working pressure is 0.36-0.39MPa, and the vulcanization time is 30 minutes.

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