A method for high-precision molding of protective gloves for glove boxes

Abstract

This invention relates to a high-precision molding method for glove box protective gloves, comprising: preparing a rubber compound; feeding the rubber compound into a calender, calendering it into sheets of fixed thickness each time; based on a modular design, cutting the sheets into several modular pieces of different sizes and shapes; placing the modular pieces of different sizes and shapes into a glove mold according to a set splicing position for compression vulcanization; and obtaining the glove box protective gloves after demolding. This invention, through extrusion calendering and modular design of the sheets, can precisely control the dimensional accuracy of the gloves, improving problems such as waste and high defect rates caused by inconsistent mold design and vulcanized sheet thickness, and achieving the production of large-size, irregularly shaped, high-precision, ultra-thin gloves.

Description

Technical Field

[0001] This invention relates to the field of glove box protective glove manufacturing technology, and in particular to a high-precision molding method for glove box protective gloves. Background Technology

[0002] Glove box protective gloves are widely used as effective protective equipment. In the nuclear industry glove box protective glove sector, in addition to requiring gloves with high shielding performance, existing glove box glove manufacturing processes are mainly divided into dip molding and compression molding. Dip molding involves immersing the mold of the product into a coagulant solution, and then into the latex of the ingredients. The latex gels on the surface of the mold with the coagulant. The wet gel undergoes dehydration, leaching, drying, and vulcanization to obtain the finished glove. However, when using the traditional dip molding process, the thickness and hem dimensional accuracy of the glove box protective gloves are insufficient, leading to a decrease in the airtightness of the glove box and the risk of leakage. For glove box gloves with high radiation protection requirements, a large amount of high-density metal powder needs to be added to the dip latex, which is prone to sedimentation and makes it difficult to produce gloves with uniform protection. Compression molding involves placing a rubber sheet into a mold cavity at the molding temperature, and then closing the mold and applying pressure to vulcanize it. The dimensional accuracy of a single glove produced by this process is improved compared to dip molding.

[0003] Most gloves used in glove boxes are 0.8mm thick, but in some delicate applications, the thickness needs to be further reduced to 0.6mm or even 0.4mm. Generally, the actual thickness accuracy of molded gloves during production is between -0.2 and 0.3mm, and the finished product accuracy is between -0.1 and 0.2mm. When making 0.4mm gloves, the dimensional error is large, making it difficult to meet practical requirements. This is because conventional molding methods typically involve molding a single piece of material. Due to the large size of the molding die and the irregular shape of the palm area, uneven pressure distribution during the glove molding process can easily occur, thus failing to guarantee the precision of the finished glove. Therefore, for the production of large-sized, irregularly shaped, high-precision ultra-thin gloves, existing molding methods are insufficient to produce products with good precision. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-precision molding method for glove box protective gloves, which improves the problems of waste and high defect rate caused by inconsistent mold design and vulcanized sheet thickness, and achieves high-precision manufacturing of ultra-thin gloves.

[0005] The technical solution adopted in this invention is as follows:

[0006] A method for high-precision molding of protective gloves for glove boxes includes the following steps:

[0007] 1) Put the rubber into an internal mixer for plasticizing;

[0008] 2) Add plasticizer, antioxidant, and activator to the internal mixer and perform a single mixing;

[0009] 3) Add reinforcing agent and shielding component for secondary mixing, and then remove glue after reaching the set time and temperature;

[0010] 4) Pass the discharged rubber through a two-roll mill to obtain section A compound rubber, and let it stand at a set temperature for a set time;

[0011] 5) Add the A-section compound, vulcanizing agent, and accelerator into the internal mixer and mix three times. After reaching the set time and temperature, discharge the compound.

[0012] 6) Pass the discharged rubber through a two-roll mill to obtain the B-section compound;

[0013] 7) The B-section compound is fed into a calender and calendered into sheets of a fixed thickness each time;

[0014] 8) Based on modular design, the sheet material is cut into several modular pieces of different sizes and shapes;

[0015] 9) The modular pieces of different sizes and shapes are placed into the glove mold according to the set splicing position for molding and vulcanization. After demolding, the glove box protective gloves are obtained.

[0016] The further technical solution is as follows:

[0017] The plasticizing temperature is 60–100°C; the primary mixing temperature is 70–120°C.

[0018] The secondary mixing temperature is 100–160°C;

[0019] The temperature for the three-stage mixing process is 70–120°C.

[0020] The roll temperature of the calender is 40–95°C;

[0021] The molding and vulcanization temperature is 150–170°C.

[0022] The sheet thickness produced by the calendering machine ranges from 0.6 to 2.5 mm, with a thickness dimensional accuracy of 0.1 mm.

[0023] The module includes a first piece and a second piece, wherein the first piece is a trapezoidal structure and the second piece is an arc-shaped structure.

[0024] The first piece includes a large trapezoidal unit piece, or multiple medium trapezoidal unit pieces arranged along the length of the glove with gradually changing areas; both the large trapezoidal unit piece and the medium trapezoidal unit pieces are isosceles trapezoids;

[0025] The second piece includes a large arc-shaped unit piece, or a small arc-shaped unit piece and a small trapezoidal unit piece arranged along the length of the glove, or a small arc-shaped unit piece and multiple curved trapezoidal unit pieces;

[0026] The small trapezoidal unit piece is an isosceles trapezoid;

[0027] The curved trapezoidal unit piece has an arc-shaped edge; the plurality of curved trapezoidal unit pieces are arranged along the width direction of the glove and spliced ​​at the arc-shaped edge.

[0028] Step 8) further includes: cutting a third piece according to the shape and size of the second piece, wherein the third piece is made of a different material than the second piece;

[0029] Step 9) further includes: placing the modular pieces of different sizes and shapes into the glove mold according to the set splicing positions, stacking the second piece with the first piece, performing molding and vulcanization, and obtaining the glove box protective gloves after demolding.

[0030] The dimensions of the glove mold, calculated by cuff diameter × thickness × length, are (150~285)mm × (0.4~1.0)mm × (700~800)mm.

[0031] The plasticizing time is 30 seconds to 2 minutes;

[0032] The mixing time for each step is 1 to 4 minutes;

[0033] The secondary mixing time is 2 to 6 minutes, and the corresponding discharge temperature is 100 to 160°C.

[0034] The three mixing times are 30s to 4min, and the corresponding discharge temperature is 70 to 120℃.

[0035] The molding and vulcanization time is 8–15 min.

[0036] The open mill is passed through 3 to 5 times when preparing the A-section compound, and then left to stand at 15 to 30°C for 8 hours; the open mill is passed through 3 to 5 times when preparing the B-section compound.

[0037] The rubber includes one or a mixture of several of the following: ethylene propylene diene monomer (EPDM) rubber, butyl rubber, halogenated butyl rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber.

[0038] The beneficial effects of this invention are as follows:

[0039] This invention controls the sheet thickness precision through extrusion calendering, enabling precise control of glove dimensions. This reduces problems such as uneven material feeding and slow sheet feeding speed during the production of large-size glove boxes, and improves issues like waste and high defect rates caused by inconsistent mold design and vulcanized sheet thickness. The modular design of this invention fixes the sheet size, further improving the dimensional accuracy of large-size gloves and enabling the production of large-size, irregularly shaped, high-precision ultra-thin gloves. Specifically, this invention has the following advantages:

[0040] This invention employs a modular design, cutting a sheet of material of fixed thickness into several modular pieces of different sizes and shapes. These modular pieces are then assembled during the molding and vulcanization process. This achieves controllable thickness across different areas of the glove and facilitates uniform pressure distribution, improving the material's anisotropic consistency. It solves the problem of poor anisotropic material consistency, resulting in poor thickness uniformity and low molding precision, caused by the limitations of the mold cavity structure in traditional one-piece molding methods. Specifically, in some products, the palm portion needs to be thicker to cope with various mechanical hazards, while the arm portion needs to be of moderate thickness to provide good protection while ensuring wearing comfort. Therefore, in step 8) of this application, the third piece is cut according to the shape and size of the second piece. In step 9), the modular pieces of different sizes and shapes are placed into the glove mold according to the set splicing positions, and the second and third pieces are stacked together for molding and vulcanization. After demolding, a glove box protective glove with different thicknesses for the palm and arm portions is obtained.

[0041] This invention sets the mixing temperature to 70–160°C, which is higher than the melting point of most additives. This facilitates uniform mixing of the additives and also helps to remove moisture from the mixed rubber, ensuring the yield and quality of the glove products and improving the preparation efficiency.

[0042] Other features and advantages of the invention will be set forth in the following description or may be learned by practicing the invention. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the combined structure of different shaped module pieces according to an embodiment of the present invention.

[0044] Figure 2 This is a side view of the glove structure prepared according to an embodiment of the present invention.

[0045] In the diagram: 1. Large trapezoidal unit piece; 2. Medium trapezoidal unit piece; 3. Large bow-shaped unit piece; 4. Small bow-shaped unit piece; 5. Curved trapezoidal unit piece; 6. Small trapezoidal unit piece; 7. Hand portion; 8. Arm portion. Detailed Implementation

[0046] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0047] This application discloses a high-precision molding method for protective gloves for glove boxes, comprising the following steps:

[0048] 1) Put the rubber into an internal mixer for plasticizing;

[0049] 2) Add plasticizer, antioxidant, and activator to the internal mixer and perform a single mixing;

[0050] 3) Add reinforcing agent and shielding component for secondary mixing, and then remove glue after reaching the set time and temperature;

[0051] 4) Pass the discharged rubber through a two-roll mill to obtain section A compound rubber, and let it stand at a set temperature for a set time;

[0052] 5) Add the A-section compound, vulcanizing agent, and accelerator into the internal mixer and mix three times. After reaching the set time and temperature, discharge the compound.

[0053] 6) Pass the discharged rubber through a two-roll mill to obtain the B-section compound;

[0054] 7) The B-section compound is fed into a calender and calendered into sheets of a fixed thickness each time;

[0055] 8) Based on modular design, the sheet material is cut into several modular pieces of different sizes and shapes;

[0056] 9) The modular pieces of different sizes and shapes are placed into the glove mold according to the set splicing position for molding and vulcanization. After demolding, the glove box protective gloves are obtained.

[0057] This application employs a modular design, cutting a sheet of material of fixed thickness into several modular pieces of different sizes and shapes, which are then assembled during the molding and vulcanization process. This achieves controllable thickness across different areas of the glove and facilitates uniform pressure distribution, improving the material's anisotropic consistency. It solves the problem of poor anisotropic material consistency, resulting in poor thickness uniformity and low molding accuracy, caused by the limitations of the mold cavity structure in traditional one-piece molding methods.

[0058] The sheet material produced by the calendering machine in this application has a thickness range of 0.6–2.5 mm. Through modular splicing, gloves with thickness grades of 0.4 mm, 0.6 mm, 0.8 mm, and 1.0 mm can be produced, with an error of ±0.1 mm (i.e., a thickness dimensional accuracy of 0.1 mm). The resulting gloves have a length of (700–800) ±5 mm, a cuff diameter of (150, 165, 180, 200, 285) ±2 mm, and a glove hem diameter of 5 ±0.5 mm.

[0059] As a specific embodiment, the size of the glove mold of this application is (150~285)mm×(0.4~1.0)mm×(700~800)mm, measured by cuff diameter×thickness×length.

[0060] As a preferred embodiment, the plasticizing temperature of this application is 60-100°C; the temperature of the primary mixing is 70-120°C.

[0061] The secondary mixing temperature is 100–160°C;

[0062] The temperature for the three-stage mixing process is 70–120°C.

[0063] The roll temperature of the calender is 40–95°C;

[0064] The molding and vulcanization temperature is 150–170°C.

[0065] This application sets the mixing temperature to 70–160°C, which is higher than the melting point of most additives. This facilitates uniform mixing between additives and also helps to remove moisture from the mixed rubber, ensuring the yield and quality of the glove products and improving the preparation efficiency.

[0066] In a specific embodiment, the module pieces of different sizes and shapes include a first piece and a second piece;

[0067] The first piece is trapezoidal in shape, and the second piece is arc-shaped.

[0068] The first and second pieces may have the same or different thicknesses.

[0069] See Figure 1 The first piece, corresponding to the arm portion, includes a large trapezoidal unit piece 1 or multiple medium trapezoidal unit pieces 2 arranged along the length of the glove with gradually changing areas; both the large trapezoidal unit piece 1 and the medium trapezoidal unit piece 2 are isosceles trapezoids.

[0070] The second piece, corresponding to the palm portion, includes a large bow-shaped unit piece 3, or a small bow-shaped unit piece 4 and multiple curved trapezoidal unit pieces 5, or a small bow-shaped unit piece 4 and a small trapezoidal unit piece 6 arranged along the length of the glove; the small trapezoidal unit piece 6 is an isosceles trapezoid, and the curved trapezoidal unit piece 5 has an arc-shaped edge.

[0071] Specifically, multiple curved trapezoidal unit pieces 5 are arranged along the width direction of the glove and are connected on one side of the curved edge.

[0072] See Figure 2 ,and Figure 1 Same, Figure 2The area on either side of the central dotted line is the palm portion 7 and the arm portion 8, respectively. In some products, the palm portion 7 needs to be thicker to cope with various mechanical hazards during use, while the arm portion 8 needs to be of moderate thickness to provide good protection while ensuring wearing comfort.

[0073] Therefore, in some specific embodiments, the thickness of the first piece is less than the thickness of the second piece. Alternatively, the thickness of the first piece is the same as the thickness of the second piece, and in step 8), a third piece is cut according to the shape and size of the second piece. The third piece is made of nylon fabric. In step 9), the modular pieces of different sizes and shapes are placed into the glove mold according to the set splicing positions, and the second piece and the third piece are stacked together for molding and vulcanization. After demolding, a glove box protective glove with different thicknesses for the palm part 7 and the arm part 8 is obtained.

[0074] In other products, the requirements for different sections of the glove are also different. Therefore, whether the thickness of the first and second pieces is the same, and whether a third piece needs to be designed, all depend on the actual needs to meet the requirements of different products.

[0075] Therefore, this application, through modular design, allows for the selection of different compounded rubber sheets for use in the same glove, thereby achieving functional integration and partitioning.

[0076] In a specific embodiment, the plasticizing time is 30 seconds to 2 minutes;

[0077] The mixing time for each step is 1 to 4 minutes;

[0078] The secondary mixing time is 2 to 6 minutes, and the corresponding discharge temperature is 100 to 160°C.

[0079] The three mixing times are 30s to 4min, and the corresponding discharge temperature is 70 to 120℃.

[0080] The molding and vulcanization time is 8–15 min.

[0081] As a specific implementation, the open mill is passed through 3 to 5 times when preparing the A-section compound, and then left to stand at 15 to 30°C for 8 hours; the open mill is passed through 3 to 5 times when preparing the B-section compound.

[0082] In a specific embodiment, the rubber includes one or a mixture of several of EPDM rubber, butyl rubber, halogenated butyl rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber.

[0083] The following specific embodiments further illustrate the solution of this application.

[0084] Example 1:

[0085] A method for high-precision molding of protective gloves for glove boxes includes:

[0086] 1) Put the rubber into a mixer and masticate for 30 seconds.

[0087] 2) Add plasticizer, antioxidant, and activator to the internal mixer and mix for 2 minutes.

[0088] 3) Add reinforcing agents and shielding components for secondary mixing, and discharge the adhesive when the temperature reaches 160℃.

[0089] 4) Pass the discharged rubber through a two-roll mill to obtain section A compound rubber, and let it stand at a certain temperature for more than 8 hours.

[0090] 5) Add the A-section compound, vulcanizing agent, and accelerator to the internal mixer and mix three times. Discharge the compound when the temperature reaches 90°C.

[0091] 6) Pass the discharged rubber through a two-roll mill to obtain the B-section compound;

[0092] 7) The B-section compound is fed into a calender and calendered into a sheet with a thickness of 2mm ± 0.05mm. After cooling, it is wound up or cut.

[0093] 8) Based on modular design, the sheet material is cut into several modular pieces of different sizes and shapes.

[0094] Specifically, based on the characteristics of the hand shape—wide upper arm, then palm, and narrowest wrist—and the long arm and short hand, the modular design consists of a large trapezoidal unit (for the arm) and a large arched unit (for the palm), such as... Figure 1 As shown in (a).

[0095] Among them, the large trapezoidal unit piece is an isosceles trapezoid with the following dimensions: short side 8cm, long side 18cm, and height 50cm.

[0096] The large bow-shaped unit piece is a superior arc bow shape, with dimensions of 6cm radius and 8cm chord length.

[0097] 9) Place the modular pieces of different sizes and shapes into the glove mold according to the set splicing position and perform molding and vulcanization at 160°C for 12 minutes. After demolding, a 165mm×1.0mm×750mm glove box protective glove is obtained.

[0098] Specifically, the component allocation ratio in this embodiment is as follows:

[0099] 100 parts butyl rubber, 300 parts tungsten powder (shielding component), 20 parts N110 (reinforcing agent), 5 parts zinc oxide (activator), 1 part stearic acid (plasticizer / softener), 1 part antioxidant D, 10 parts C5 petroleum resin (plasticizer), 3 parts paraffin wax (plasticizer), 1.2 parts sulfur (vulcanizing agent), 0.7 parts thiuram accelerator TMTD, and 1.5 parts thiazole accelerator MBTS.

[0100] Example 2

[0101] A method for high-precision molding of protective gloves for glove boxes includes:

[0102] 1) Put EPDM rubber into a mixer and masticate for 60 seconds.

[0103] 2) Add plasticizer, antioxidant, and activator to the internal mixer and mix for 3 minutes.

[0104] 3) Add reinforcing agents and shielding components for secondary mixing, and discharge the adhesive when the temperature reaches 140℃.

[0105] 4) Pass the discharged rubber through a two-roll mill to obtain section A compound rubber, and let it stand at a certain temperature for more than 8 hours.

[0106] 5) Add the A-section compound, vulcanizing agent, and accelerator to the internal mixer and mix three times. Discharge the compound when the temperature reaches 95°C.

[0107] 6) Pass the discharged rubber through a two-roll mill to obtain the B-section compound rubber.

[0108] 7) The B-section compound is fed into a calender and calendered into a sheet with a thickness of 0.6mm ± 0.05mm. After cooling, it is wound up or cut.

[0109] 8) Based on modular design, the sheet material is cut into several modular pieces of different sizes and shapes.

[0110] Specifically, based on the characteristics of the hand shape—wide upper arm, then palm, and narrowest wrist—and the long arm and short hand, the modular pieces are designed as two medium trapezoidal unit pieces (for the arm), two curved trapezoidal unit pieces, and one small arched unit piece (for the palm), such as... Figure 1 As shown in (b).

[0111] in:

[0112] Both trapezoidal unit pieces 2 are isosceles trapezoids with gradually changing areas, and their dimensions are as follows:

[0113] Trapezoidal unit piece A: short side 10cm, long side 18cm, height 25cm;

[0114] Trapezoidal unit piece B: short side 20cm, long side 24cm, height 25cm.

[0115] The small bow-shaped unit piece is a superior arc shape, with dimensions of 9cm radius and 8cm chord length.

[0116] The dimensions of the two curved trapezoidal unit pieces are: short side 4cm, long side 5cm, height 4cm; arc length 5cm.

[0117] 9) Place the modular pieces of different sizes and shapes into the glove mold according to the set splicing position, and perform molding and vulcanization at 160°C for 15 minutes. After demolding, a glove box protective glove of 180mm×0.4mm×800mm is obtained.

[0118] Specifically, the component allocation ratio in this embodiment is as follows:

[0119] 100 parts EPDM rubber, 300 parts bismuth powder (shielding component), 20 parts N550 (reinforcing agent), 5 parts zinc oxide (activator), 2 parts stearic acid (plasticizer / softener), 1 part antioxidant A, 5 parts C9 petroleum resin (plasticizer), 5 parts paraffin wax (plasticizer), 1.5 parts sulfur (vulcanizing agent), 1 part thiuram accelerator DPTT, and 1.5 parts thiazole accelerator MBT.

[0120] Example 3:

[0121] A method for high-precision molding of protective gloves for glove boxes includes:

[0122] 1) Put the rubber into a mixer and masticate for 60 seconds.

[0123] 2) Add plasticizer, antioxidant, and activator to the internal mixer and mix for 2 minutes.

[0124] 3) Add reinforcing agents and shielding components for secondary mixing, and discharge the glue when the temperature reaches 110℃.

[0125] 4) Pass the discharged rubber through a two-roll mill to obtain section A compound rubber, and let it stand at a certain temperature for more than 8 hours;

[0126] 5) Add the A-section compound, vulcanizing agent, and accelerator into the internal mixer and mix three times. Discharge the compound when the temperature reaches 80°C.

[0127] 6) Pass the discharged rubber through a two-roll mill to obtain the B-section compound;

[0128] 7) The B-section compound is fed into a calender and calendered into a sheet with a thickness of 2.5mm ± 0.05mm. After cooling, it is wound up or cut.

[0129] 8) Based on modular design, the sheet material is cut into several modular pieces of different sizes and shapes.

[0130] Specifically, based on the characteristics of the hand shape—wide upper arm, medium palm, and narrowest wrist—and the long arm / short hand configuration, the modular design consists of three medium trapezoidal units (for the arm), one small arched unit, and one small trapezoidal unit (for the palm), such as... Figure 1 As shown in (c).

[0131] in:

[0132] The three trapezoidal unit pieces are all isosceles trapezoids with gradually changing areas, and their dimensions are as follows:

[0133] Trapezoidal unit piece A: short side 8cm, long side 11cm, height 8cm;

[0134] Trapezoidal unit piece B: short side 12cm, long side 15cm, height 14cm;

[0135] Trapezoidal unit piece C: short side 16cm, long side 18cm, height 14cm;

[0136] The small bow-shaped unit piece is a superior arc bow shape, with dimensions of 7cm radius and 7cm chord length;

[0137] The small trapezoidal unit piece is an isosceles trapezoid with dimensions of 8cm for the short side, 14cm for the long side, and 10cm for the height.

[0138] 9) Place the modular pieces of different sizes and shapes into the glove mold according to the set splicing position and perform molding and vulcanization at 160°C for 10 minutes. After demolding, a glove box protective glove of 200mm×0.8mm×800mm is obtained.

[0139] Specifically, the component allocation ratio in this embodiment is as follows:

[0140] 100 parts chlorinated butyl rubber, 250 parts tungsten powder (shielding component), 25 parts silica (reinforcing agent), 4 parts magnesium oxide (activator), 2 parts stearic acid (plasticizer / softener), 1 part antioxidant D, 15 parts C5 petroleum resin (plasticizer), 1 part paraffin wax (plasticizer), 3 parts surfactant 935P, and 5 parts zinc oxide (vulcanizing agent).

[0141] Example 4:

[0142] 1) Put the rubber into a mixer and masticate for 60 seconds.

[0143] 2) Add plasticizer, antioxidant, and activator to the internal mixer and mix for 2 minutes.

[0144] 3) Add reinforcing agents and shielding components for secondary mixing, and discharge the glue when the temperature reaches 110℃.

[0145] 4) Pass the discharged rubber through a two-roll mill to obtain section A compound rubber, and let it stand at a certain temperature for more than 8 hours.

[0146] 5) Add the A-section compound, vulcanizing agent, and accelerator to the internal mixer and mix three times. Discharge the compound when the temperature reaches 80°C.

[0147] 6) Pass the discharged rubber through a two-roll mill to obtain the B-section compound;

[0148] 7) The B-section compound is fed into a calender and calendered into a sheet with a thickness of 1.5mm ± 0.05mm. After cooling, it is wound up or cut.

[0149] 8) Based on modular design, the sheet material is cut into several modular pieces of different sizes and shapes. Specifically, considering the characteristics of the hand shape—wide upper arm, then palm, then wrist, and long arm / short hand—the modular pieces are designed as a large trapezoidal unit piece (for the arm) and a large arc-shaped unit piece (for the palm), such as... Figure 1 As shown in (a).

[0150] The large trapezoidal unit piece is an isosceles trapezoid with the following dimensions: short side 8cm, long side 20cm, and height 60cm.

[0151] The large bow-shaped unit piece is a superior arc bow shape, with dimensions of 8cm radius and 8cm chord length.

[0152] Then, nylon fabric pieces are cut according to the shape and size of the large bow-shaped unit piece. The radius of the nylon fabric piece is 6cm and the chord length is 8cm.

[0153] 9) Place the modular pieces of different sizes and shapes into the glove mold according to the set splicing positions, and stack the nylon fabric pieces with the large bow-shaped unit pieces. Mold and vulcanize at 160℃ for 12 minutes. After demolding, a glove box protective glove measuring 165mm × (1.0~1.2)mm × 750mm is obtained. After molding, the nylon fabric is located on the outer layer of the palm, and the corresponding rubber layer is located on the inner layer of the palm.

[0154] Specifically, the component allocation ratio in this embodiment is the same as that in Embodiment 3:

[0155] 100 parts chlorinated butyl rubber, 250 parts tungsten powder (shielding component), 25 parts silica (reinforcing agent), 4 parts magnesium oxide (activator), 2 parts stearic acid (plasticizer / softener), 1 part antioxidant D, 15 parts C5 petroleum resin (plasticizer), 1 part paraffin wax (plasticizer), 3 parts surfactant 935P, and 5 parts zinc oxide (vulcanizing agent).

[0156] Example 5

[0157] 1) Put the rubber into a mixer and masticate for 30 seconds.

[0158] 2) Add plasticizer, antioxidant, and activator to the internal mixer and mix for 2 minutes.

[0159] 3) Add reinforcing agents and shielding components for secondary mixing, and discharge the adhesive when the temperature reaches 160℃.

[0160] 4) Pass the discharged rubber through a two-roll mill to obtain section A compound rubber, and let it stand at a certain temperature for more than 8 hours.

[0161] 5) Add the A-section compound, vulcanizing agent, and accelerator to the internal mixer and mix three times. Discharge the compound when the temperature reaches 90°C.

[0162] 6) Pass the discharged rubber through a two-roll mill to obtain the B-section compound;

[0163] 7) The B-section compound is fed into a calender and calendered into a sheet with a thickness of 2mm ± 0.05mm. After cooling, it is wound up or cut.

[0164] 8) Based on modular design, the sheet material is cut into several modular pieces of different sizes and shapes. Specifically, considering the characteristics of the hand shape—wide upper arm, then palm, then wrist, and long arm / short hand—the modular pieces are designed as a large trapezoidal unit piece (for the arm) and a large arc-shaped unit piece (for the palm), such as... Figure 1 As shown in (a).

[0165] The large trapezoidal unit piece is an isosceles trapezoid with the following dimensions: short side 8cm, long side 18cm, and height 50cm.

[0166] The large bow-shaped unit piece is a superior arc bow shape, with dimensions of 6cm radius and 8cm chord length.

[0167] Then, cut nylon fabric pieces according to the shape and size of the large bow-shaped unit piece. The nylon fabric pieces have a radius of 5cm and a chord length of 7cm.

[0168] 9) Place the modular pieces of different sizes and shapes into the glove mold according to the set splicing positions, and stack the nylon fabric pieces with the large bow-shaped unit pieces. Mold and vulcanize at 160℃ for 12 minutes. After demolding, a glove box protective glove measuring 165mm × (1.0~1.2)mm × 750mm is obtained. After molding, the nylon fabric is located on the outer layer of the palm, and the corresponding rubber layer is located on the inner layer of the palm.

[0169] Specifically, the component allocation ratio in this embodiment is the same as that in Embodiment 1:

[0170] 100 parts butyl rubber, 300 parts tungsten powder (shielding component), 20 parts N110 (reinforcing agent), 5 parts zinc oxide (activator), 1 part stearic acid (plasticizer / softener), 1 part antioxidant D, 10 parts C5 petroleum resin (plasticizer), 3 parts paraffin wax (plasticizer), 1.2 parts sulfur (vulcanizing agent), 0.7 parts thiuram accelerator TMTD, and 1.5 parts thiazole accelerator MBTS.

[0171] Comparative Example 1

[0172] 1) Put EPDM rubber into an internal mixer and masticate for 60 seconds;

[0173] 2) Add plasticizers, antioxidants, activators and other additives and mix for 3 minutes.

[0174] 3) Add reinforcing agents, shielding components, etc., and perform secondary mixing. When the temperature reaches 140℃, discharge the glue.

[0175] 4) Pass through a two-roll mill and sheet to obtain section A compound rubber, and let it stand at a certain temperature for more than 8 hours;

[0176] 5) Add the A-section compound, vulcanizing agent, accelerator, etc. into the internal mixer and mix three times. Discharge the compound when the temperature reaches 95℃.

[0177] 6) Pass the discharged rubber through a two-roll mill to obtain the B-section compound;

[0178] 7) Feed the B-section compound into an extrusion calender and calender it into sheets. The sheet thickness is not fixed. After cooling, the sheets are rolled up or cut.

[0179] 8) Place the sheet material into the glove mold and mold it at 160°C for 15 minutes. After demolding, a glove box protective glove of 180mm×0.4mm×800mm is obtained.

[0180] Specifically, the proportions of this comparative sample are the same as those in Example 2:

[0181] 100 parts EPDM rubber, 300 parts bismuth powder (shielding component), 20 parts N550 (reinforcing agent), 5 parts zinc oxide (activator), 2 parts stearic acid (plasticizer / softener), 1 part antioxidant A, 5 parts C9 petroleum resin (plasticizer), 5 parts paraffin wax (plasticizer), 1.5 parts sulfur (vulcanizing agent), 1 part thiuram accelerator DPTT, and 1.5 parts thiazole accelerator MBT.

[0182] In each of the above embodiments and Comparative Example 1, one glove box protective glove was prepared. The thickness of the palm, forearm, upper arm, length, cuff diameter, and rolled edge diameter of each glove were measured. The thickness was measured at five different locations. The test results are shown in Table 1 below.

[0183] Table 1. Measurement results of the glove products obtained in each embodiment and comparative example.

[0184]

[0185]

[0186] The test results show that the dimensional accuracy of the gloves prepared in this embodiment is: thickness accuracy ±0.1mm, length accuracy ±5mm, cuff diameter accuracy ±2mm, and hem diameter ±0.5mm.

[0187] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-precision molding method for protective gloves for glove boxes, characterized in that, Includes the following steps: 1) Put the rubber into an internal mixer for plasticizing; 2) Add plasticizer, antioxidant, and activator to the internal mixer and perform a single mixing; 3) Add reinforcing agent and shielding component for secondary mixing, and then remove glue after reaching the set time and temperature; 4) Pass the discharged rubber through a two-roll mill to obtain section A compound rubber, and let it stand at a set temperature for a set time; 5) Add the A-section compound, vulcanizing agent, and accelerator into the internal mixer and mix three times. After reaching the set time and temperature, discharge the compound. 6) Pass the discharged rubber through a two-roll mill to obtain the B-section compound; 7) The B-section compound is fed into a calender and calendered into sheets of a fixed thickness each time; 8) Based on modular design, the sheet material is cut into several modular pieces of different sizes and shapes; 9) The modular pieces of different sizes and shapes are placed into the glove mold according to the set splicing position for molding and vulcanization. After demolding, the glove box protective gloves are obtained.

2. The method according to claim 1, characterized in that, The plasticizing temperature is 60–100°C; the primary mixing temperature is 70–120°C. The secondary mixing temperature is 100–160°C; The temperature for the three-stage mixing process is 70–120°C. The roll temperature of the calender is 40–95°C; The molding and vulcanization temperature is 150–170°C.

3. The method according to claim 1, characterized in that, The sheet thickness produced by the calendering machine ranges from 0.6 to 2.5 mm, with a thickness dimensional accuracy of 0.1 mm.

4. The method according to claim 1, characterized in that, The module includes a first piece and a second piece, wherein the first piece is a trapezoidal structure and the second piece is an arc-shaped structure.

5. The method according to claim 4, characterized in that, The first piece includes a large trapezoidal unit piece, or multiple medium trapezoidal unit pieces arranged along the length of the glove with gradually changing areas; both the large trapezoidal unit piece and the medium trapezoidal unit pieces are isosceles trapezoids; The second piece includes a large arc-shaped unit piece, or a small arc-shaped unit piece and a small trapezoidal unit piece arranged along the length of the glove, or a small arc-shaped unit piece and multiple curved trapezoidal unit pieces; The small trapezoidal unit piece is an isosceles trapezoid; The curved trapezoidal unit piece has an arc-shaped edge; the plurality of curved trapezoidal unit pieces are arranged along the width direction of the glove and spliced ​​at the arc-shaped edge.

6. The method according to claim 4, characterized in that, Step 8) further includes: cutting a third piece according to the shape and size of the second piece, wherein the third piece is made of a different material than the second piece; Step 9) further includes: placing the modular pieces of different sizes and shapes into the glove mold according to the set splicing positions, stacking the second piece with the first piece, performing molding and vulcanization, and obtaining the glove box protective gloves after demolding.

7. The method according to claim 1, characterized in that, The dimensions of the glove mold, calculated by cuff diameter × thickness × length, are (150~285)mm × (0.4~1.0)mm × (700~800)mm.

8. The method according to claim 1, characterized in that, The plasticizing time is 30 seconds to 2 minutes; The mixing time for each step is 1 to 4 minutes; The secondary mixing time is 2 to 6 minutes, and the corresponding discharge temperature is 100 to 160°C. The three mixing times are 30s to 4min, and the corresponding discharge temperature is 70 to 120℃. The molding and vulcanization time is 8–15 min.

9. The method according to claim 1, characterized in that, The open mill is passed through 3 to 5 times when preparing the A-section compound, and then left to stand at 15 to 30°C for 8 hours; the open mill is passed through 3 to 5 times when preparing the B-section compound.

10. The method according to claim 1, characterized in that, The rubber includes one or a mixture of several of the following: ethylene propylene diene monomer (EPDM) rubber, butyl rubber, halogenated butyl rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber.

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