Natural rubber glove box protective glove suitable for compression molding and manufacturing method thereof

Abstract

The invention discloses a natural rubber glove box protective glove suitable for compression molding. The natural rubber glove box protective glove comprises rubber, zinc oxide, stearic acid, an anti-aging agent, an internal lubricant, a plasticizer, white carbon black, a silane coupling agent Si69, a toner, sulfur and an accelerant. The natural rubber glove box protective glove is manufactured through a mold pressing process, and the process comprises the working procedures of mixing, mold pressing forming and the like. By means of the manufacturing method, direct forming of the solid sizing material can be achieved, sizing material distribution is accurately controlled through the mold, the fluidity influence is avoided, the thickness consistency of all parts of the glove is ensured, local too thin or too thick parts are avoided, and therefore higher size precision is obtained. By mixing the rubber with other specific components, the mechanical property and the chemical protection property of the protective gloves are remarkably improved, and the glove box protective gloves manufactured by the method can meet all standard requirements of glove box gloves.

Description

Technical Field

[0001] This invention belongs to the field of rubber product preparation technology, and in particular relates to a natural rubber glove box protective glove suitable for compression molding and its manufacturing method. Background Technology

[0002] Most commercially available natural rubber gloves are manufactured using the dip-molding method. In the traditional dip-molding method, the fingertips and palms are immersed in the coagulant and latex solution first, followed by the upper arm. Due to gravity, the amount of coagulant and latex solution adhering to the fingertips and palms is higher than that to the upper arm. This results in a thicker film at the fingertips and palms and a thinner film near the rolled edge on the upper arm, sometimes with a thickness difference exceeding 0.15mm. The rolling process in the traditional dip-molding method relies heavily on manual operation, and inconsistent force and angle lead to significant differences in the rolled edge diameter. Rolling must be done before the latex is completely dry, but residual moisture evaporates during vulcanization, forming internal bubbles and weakening the rolled edge structure. If rolled after drying, the latex film becomes too dry, resulting in insufficient adhesion and causing the rolled edge to be weak or open. Due to these limitations in the dip-molding method of latex glove manufacturing, approximately 50% of products have problems such as uneven thickness and insufficient dimensional accuracy of the rolled edge, thus creating a risk of gas leakage from the glove box protective gloves. Therefore, there is an urgent need to develop a manufacturing method for natural rubber glove boxes and protective gloves to overcome the shortcomings of the existing impregnation method for manufacturing latex gloves. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a natural rubber glove box protective glove suitable for compression molding and its manufacturing method. The manufacturing method of this invention, by employing a compression molding process to precisely control the distribution of the rubber compound, achieves higher dimensional accuracy compared to the traditional impregnation method. Furthermore, the use of a compression molding process to blend rubber with other components can also improve the mechanical and chemical protective properties of the protective glove.

[0004] In a first aspect, the present invention discloses a protective glove for a natural rubber glove box suitable for compression molding, comprising the following components in parts by weight: 100 parts rubber, 4-5 parts zinc oxide, 1-2 parts stearic acid, 1-2 parts antioxidant, 0.1-3 parts internal lubricant, 5-15 parts plasticizer, 10-20 parts silica, 1-2 parts silane coupling agent Si69, 0.5-3 parts colorant, 1.5-3 parts sulfur, and 1-4 parts accelerator.

[0005] Furthermore, the rubber is selected from natural rubber or a combination of natural rubber and at least one of butyl rubber, EPDM rubber, and chloroprene rubber.

[0006] Furthermore, the natural rubber is selected from at least one of SCR-5, SCR-10, SCR-20, SCR-WF, and premium wind-blown rubber ADS-XL.

[0007] Furthermore, the antioxidant is selected from at least one of antioxidant 4010Na, antioxidant 4020, and antioxidant RD.

[0008] Furthermore, the internal lubricant is selected from at least one of paraffin wax, surfactants, fatty acids and their derivatives.

[0009] Furthermore, the plasticizer is selected from at least one of petroleum resin, paraffin wax, paraffin oil, and naphthenic oil.

[0010] Furthermore, the colorant is permanent yellow and titanium dioxide, and the mass ratio of permanent yellow to titanium dioxide is 1:20~40.

[0011] Furthermore, the accelerator is selected from at least one of thiuram, thiazole, sulfenamide, dithiocarbamate, guanidine, thiophosphate, and thiourea accelerators.

[0012] Secondly, the present invention also discloses a method for manufacturing a molded natural rubber glove box protective glove, wherein the molded natural rubber glove box protective glove is the same as the natural rubber glove box protective glove of the first aspect of the present invention, and the manufacturing method includes: S1. Mixing According to the weight ratio of each component of the natural rubber glove box protective gloves, rubber, zinc oxide, stearic acid, antioxidant, internal lubricant, plasticizer, silica, silane coupling agent Si69, and colorant are added to the internal mixer and mixed. After uniform mixing, the mixture is allowed to cool to obtain section A rubber. After the section A rubber cools, sulfur and accelerator are added and mixed evenly. Then, it is passed through a two-roll mill three times. After passing through the two-roll mill, it is sent to a three-roll calender for calendering. The sheet thickness is 1~2.5mm to obtain section B rubber. S2. Compression molding Section B rubber is vulcanized on a molding machine at a temperature of 145~155℃ for 8~15 minutes and a pressure of 15~20MPa.

[0013] Furthermore, the discharge temperature of the A-section rubber compound is 130~135℃, and the discharge temperature of the B-section rubber is 80~85℃.

[0014] This invention provides a protective glove for a natural rubber glove box suitable for compression molding and a method for manufacturing the same. Compared with the prior art, this invention has at least the following advantages: 1. The manufacturing method of this invention can directly form solid rubber material by using a molding process. The distribution of the rubber material can be precisely controlled by the mold without the influence of flowability, thereby ensuring the consistency of the thickness of the fingers, palms, wrists, and arms, avoiding local thinning or thickening, and obtaining higher dimensional accuracy. The thickness tolerance can be controlled within ±0.05mm.

[0015] 2. The present invention uses a molding process to blend rubber with other components, which can effectively improve the mechanical and chemical protective properties of protective gloves. The natural rubber gloves manufactured in this way can meet all the requirements of glove box protective gloves. Detailed Implementation

[0016] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0017] Unless otherwise specified, all temperatures mentioned herein are in degrees Celsius, and the preferred embodiments can be freely combined as needed. Those skilled in the art will understand that the data and parameters described in the examples are merely exemplary and do not constitute a limitation of the invention. All components used in the following examples and comparative examples are compounds known in the art, and all equipment used is equipment publicly known in the art. All components and equipment used in this invention can be obtained commercially or prepared using known techniques.

[0018] Example 1 The manufacturing process for natural rubber glove boxes involves the following steps: S1. Mixing According to the weight ratio, add 100 parts of natural rubber SCR-WF, 5 parts of zinc oxide, 1 part of stearic acid, 1 part of antioxidant 4010Na, 3 parts of paraffin wax, 5 parts of petroleum resin, 10 parts of silica, 1 part of silane coupling agent Si69, 0.02 parts of permanent yellow, and 0.48 parts of titanium dioxide to a mixer and mix. After mixing evenly, let it stand for 15 hours to obtain section A rubber. The mixing and discharge temperature of section A rubber is 130℃. Add 3 parts sulfur, 0.5 parts accelerator DM, and 0.5 parts accelerator M to section A rubber. After mixing evenly, pass the mixture through a two-roll mill three times to obtain section B rubber. The discharge temperature of section B rubber is 80℃. After passing through the open mill, the sheet is conveyed to a three-roll calender for calendering, and the sheet thickness is 2.5mm, resulting in section B sheet material; S2. Compression molding The B-section rubber sheet was vulcanized on a molding machine at a temperature of 145℃ for 15 minutes and a pressure of 20MPa. This process produced a natural rubber glove box protective glove.

[0019] Example 2 The manufacturing process for natural rubber glove boxes involves the following steps: S1. Mixing According to the weight ratio, add 100 parts of natural rubber premium grade ADS-XL, 4.5 parts of zinc oxide, 1.5 parts of stearic acid, 1.5 parts of antioxidant 4020, 2 parts of surfactant 935P, 5 parts of petroleum resin, 5 parts of paraffin wax, 15 parts of silica, 1.5 parts of silane coupling agent Si69, 0.06 parts of permanent yellow, and 1.9 parts of titanium dioxide to a mixer and mix thoroughly. After mixing, let stand for 15 hours to obtain section A rubber. The mixing and discharge temperature of section A rubber is 133℃. Add 2 parts sulfur, 1.5 parts accelerator DM, and 1 part accelerator M to section A rubber. After mixing evenly, pass the mixture through a two-roll mill three times to obtain section B rubber. The discharge temperature of section B rubber is 82℃. After passing through the open mill, the sheet is conveyed to the three-roll calender for calendering, and the sheet thickness is 2mm, resulting in section B sheet material. S2. Compression molding Section B of the rubber sheet was vulcanized on a molding machine at a temperature of 150°C for 10 minutes and a pressure of 17 MPa. This produced a natural rubber glove box protective glove.

[0020] Example 3 The manufacturing process for natural rubber glove boxes involves the following steps: S1. Mixing According to the weight ratio, add 80 parts of natural rubber SCR-10, 20 parts of butyl rubber, 4 parts of zinc oxide, 2 parts of stearic acid, 2 parts of antioxidant RD, 0.1 parts of erucamide, 5 parts of paraffin oil, 10 parts of naphthenic oil, 20 parts of silica, 2 parts of silane coupling agent Si69, 0.07 parts of permanent yellow, and 2.8 parts of titanium dioxide to a mixer and mix. After uniform mixing, let stand for 15 hours to obtain section A rubber. The mixing and discharge temperature of section A rubber is 135℃. Add 1.5 parts sulfur, 2 parts accelerator DM, and 2 parts accelerator M to section A rubber. After mixing evenly, pass the mixture through a two-roll mill three times to obtain section B rubber. The discharge temperature of section B rubber is 85℃. After passing through the open mill, the sheet is conveyed to the three-roll calender for calendering, and the sheet thickness is 1mm, resulting in section B sheet material. S2. Compression molding Section B of the rubber sheet was vulcanized on a molding machine at a temperature of 155℃ for 8 minutes and a pressure of 15MPa. This process produced natural rubber glove boxes and protective gloves.

[0021] Mechanical property testing and analysis of protective gloves in natural rubber glove box The dimensional accuracy and mechanical properties of the natural rubber glove boxes manufactured in Examples 1-3 were tested, and the test results are shown in Table 1.

[0022] Table 1. Performance test results of the protective gloves in the natural rubber glove box of the present invention.

[0023] The protective gloves for glove boxes have high requirements for the rolled edge diameter and glove thickness. The rolled edge size should match the glove interface size. When the size deviation is large, it can easily lead to poor sealing performance. When the thickness is insufficient, the airtightness is poor, while when the thickness is too large, the wearing comfort is poor. As shown in Table 1, the hardness of the protective gloves in all embodiments of the present invention is less than 42 (Shore A), which meets the standard requirements, is comfortable to wear, and is easy to grip. The rolled edge diameter and glove thickness of the protective gloves in all embodiments of the present invention have extremely high precision, far exceeding the error requirements for rolled edge diameter and glove thickness.

[0024] In addition, protective gloves also need to possess certain mechanical strengths, including tear resistance, puncture resistance, cut resistance, abrasion resistance, 50% constant elongation stress, and tensile strength. As shown in Table 1, the tensile strength, elongation at break, 50% constant elongation stress, and tear resistance, puncture resistance, cut resistance, and abrasion resistance of each embodiment of the present invention are significantly better than the standard values. The puncture resistance of Embodiment 1 even reaches more than twice the standard value, all meeting national standard requirements. Therefore, Table 1 shows that Embodiments 1-3 of the present invention, through molding processes, have all produced high-performance natural rubber protective gloves for glove boxes that meet the requirements for use in glove boxes.

[0025] All materials used in this invention are commercially available and can be purchased from retail sources. The above description is merely a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A protective glove for a natural rubber glove box suitable for compression molding, characterized in that, It comprises the following components in parts by weight: 100 parts rubber, 4-5 parts zinc oxide, 1-2 parts stearic acid, 1-2 parts antioxidant, 0.1-3 parts internal lubricant, 5-15 parts plasticizer, 10-20 parts silica, 1-2 parts silane coupling agent Si69, 0.5-3 parts colorant, 1.5-3 parts sulfur, and 1-4 parts accelerator.

2. The natural rubber glove box protective glove according to claim 1, characterized in that, The rubber is selected from natural rubber or a combination of natural rubber and at least one of butyl rubber, EPDM rubber, and chloroprene rubber.

3. The natural rubber glove box protective glove according to claim 2, characterized in that, The natural rubber is selected from at least one of SCR-5, SCR-10, SCR-20, SCR-WF, and premium wind-blown rubber ADS-XL.

4. The natural rubber glove box protective glove according to claim 1, characterized in that, The antioxidant is selected from at least one of antioxidant 4010Na, antioxidant 4020, and antioxidant RD.

5. The natural rubber glove box protective glove according to claim 1, characterized in that, The internal lubricant is selected from at least one of paraffin wax, surfactants, fatty acids and their derivatives.

6. The natural rubber glove box protective glove according to claim 1, characterized in that, The plasticizer is selected from at least one of petroleum resin, paraffin wax, paraffin oil, and naphthenic oil.

7. The natural rubber glove box protective glove according to claim 1, characterized in that, The colorant is permanent yellow and titanium dioxide, and the mass ratio of permanent yellow to titanium dioxide is 1:20~40.

8. The natural rubber glove box protective glove according to claim 1, characterized in that, The accelerator is selected from at least one of the following: thiuram, thiazole, sulfenamide, dithiocarbamate, guanidine, thiophosphate, and thiourea accelerators.

9. A method for manufacturing protective gloves for a natural rubber glove box suitable for compression molding, characterized in that, The natural rubber glove box protective glove suitable for compression molding is the natural rubber glove box protective glove as described in any one of claims 1-8, and the manufacturing method includes: S1. Mixing According to the weight ratio of each component of the natural rubber glove box protective gloves, rubber, zinc oxide, stearic acid, antioxidant, internal lubricant, plasticizer, silica, silane coupling agent Si69, and colorant are added to the internal mixer and mixed. After uniform mixing, the mixture is allowed to cool to obtain section A rubber. After the section A rubber cools, sulfur and accelerator are added and mixed evenly. Then, it is passed through a two-roll mill three times. After passing through the two-roll mill, it is sent to a three-roll calender for calendering. The sheet thickness is 1~2.5mm to obtain section B rubber. S2. Compression molding Section B rubber is vulcanized on a molding machine at a temperature of 145~155℃ for 8~15 minutes and a pressure of 15~20MPa.

10. The method for manufacturing protective gloves for a natural rubber glove box according to claim 9, characterized in that, The discharge temperature of the A-section rubber compound is 130~135℃, and the discharge temperature of the B-section rubber is 80~85℃.

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