High-precision forming method for glove box protective gloves

Abstract

The invention relates to a high-precision forming method of glove box protective gloves. The method comprises the following steps: preparing a rubber compound; putting the rubber compound into a calender, and calendering the rubber compound into a sheet with a fixed thickness each time; cutting the sheet into a plurality of module sheets with different sizes and shapes based on modular design; the module pieces with different sizes and shapes are put into a glove mold according to set splicing positions for mold pressing vulcanization, and the glove box protective gloves are prepared after demolding. Through extrusion rolling and sheet modular design, the size precision of the glove can be accurately controlled, the problems of waste, high defective rate and the like caused by die design, inconsistent thickness of vulcanized sheets and the like are solved, and preparation of large-size, special-shaped and high-precision ultrathin gloves is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of glove box protective gloves preparation, in particular to a high-precision molding method for glove box protective gloves. Background Art

[0002] Glove box protective gloves are widely used as an effective protective device. In the nuclear industry, glove box protective gloves require high shielding properties. Existing glove box glove manufacturing processes are mainly divided into dipping and compression molding. Dipping involves dipping the mold of the product into a coagulant solution, then into the latex ingredient. The latex gels on the surface of the product mold when it encounters the coagulant. The wet gel undergoes dehydration, leaching, drying, and vulcanization to produce the finished glove. However, when using the traditional dipping process, the thickness and hem dimensional accuracy of the glove box protective gloves are insufficient, resulting in reduced airtightness and the risk of leakage. For glove box gloves with higher radiation protection requirements, a large amount of high-density metal powder must be added to the dipping latex, which is prone to sedimentation, making it difficult to produce uniformly protective gloves. Compression molding involves placing a rubber sheet into a mold cavity at the molding temperature, then closing the mold and applying pressure to vulcanize it. The dimensional accuracy of single gloves produced by this process is significantly improved compared to dipping.

[0003] The thickness of glove box gloves is mostly 0.8mm, but in some delicate application scenarios, the thickness of the gloves needs to be further reduced to 0.6mm or even 0.4mm. The thickness accuracy of general molded gloves in actual production is between -0.2 and 0.3mm, and the accuracy of the finished product is between -0.1 and 0.2mm. When 0.4mm gloves are made, the size error is large and it is difficult to meet actual requirements. This is because the conventional compression molding preparation method is usually a whole piece molding. Because the molding mold is large and the palm part is irregular, it is easy to cause uneven pressure distribution during the glove molding process, and thus the accuracy of the glove product cannot be guaranteed. Therefore, for the preparation of large-sized, irregular-shaped, high-precision ultra-thin gloves, the existing compression molding method is difficult to produce products with good precision. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a high-precision molding method for glove box protective gloves, which improves the problems of waste and high defective rate caused by mold design and inconsistent thickness of vulcanized sheets, and realizes the high-precision production of ultra-thin gloves.

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

[0006] A high-precision molding method for glove box protective gloves comprises the following steps:

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

[0008] 2) Adding plasticizer, antioxidant and active agent into internal mixer for primary mixing;

[0009] 3) Add reinforcing agent and shielding component for secondary mixing, and perform binder removal after reaching the set time and temperature;

[0010] 4) The discharged rubber is passed through an open mill to obtain a stage A mixed rubber, and the mixed rubber is kept at a set temperature for a set time;

[0011] 5) putting the mixed rubber, vulcanizing agent and accelerator of stage A into an internal mixer and mixing them three times, and then performing the discharge after reaching the set time and temperature;

[0012] 6) The discharged rubber is passed through an open mill to obtain a stage B mixed rubber;

[0013] 7) feeding the mixed rubber of stage B into a calender and rolling the mixed rubber into a sheet of fixed thickness each time;

[0014] 8) Based on modular design, cutting the sheet into a plurality of modular pieces of different sizes and shapes;

[0015] 9) placing the modular pieces of different sizes and shapes into a glove mold according to the set splicing positions for compression molding and vulcanization, and then demolding to obtain the glove box protective gloves.

[0016] Further technical solutions are:

[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 three mixing temperatures are 70-120°C;

[0020] The roller temperature of the calender is 40-95°C;

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

[0022] The sheet calendered by the calender has a thickness range of 0.6 to 2.5 mm and a thickness dimensional accuracy of 0.1 mm.

[0023] The module sheet includes a first sheet and a second sheet, the first sheet is a trapezoidal structure, and the second sheet is a major arc shape.

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

[0025] The second piece includes a large arcuate unit piece, or a small arcuate unit piece and a small trapezoidal unit piece arranged along the length direction of the glove, or a small arcuate unit piece and a plurality of curved-edge trapezoidal unit pieces;

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

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

[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 sheets of different sizes and shapes into a glove mold according to the set splicing positions, stacking the second sheet on the first sheet, performing molding and vulcanization, and demolding to obtain the glove box protective gloves.

[0030] Measured by cuff diameter×thickness×length, the size of the glove mold is (150-285) mm×(0.4-1.0) mm×(700-800) mm.

[0031] The plasticizing time is 30s to 2min;

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

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

[0034] The three mixing times are 30s to 4min, and the corresponding binder removal temperature is 70 to 120°C;

[0035] The molding vulcanization time is 8 to 15 minutes.

[0036] When preparing the A-stage rubber mix, the open mill is thinned 3 to 5 times and parked at 15 to 30° C. for 8 hours; when preparing the B-stage rubber mix, the open mill is thinned 3 to 5 times.

[0037] The rubber includes one or a mixture of EPDM rubber, butyl rubber, halogenated butyl rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber.

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

[0039] This invention controls sheet thickness precision through extrusion calendering, enabling precise control of glove dimensional accuracy. This reduces issues such as uneven material discharge and slow sheet discharge speeds during the production of large-sized glove box gloves. It also alleviates issues such as waste and high defective product rates caused by mold design and inconsistent vulcanized sheet thickness. The modular design of this invention stabilizes sheet size, further improving the dimensional accuracy of large-sized gloves and enabling the production of large-sized, special-shaped, high-precision ultrathin gloves. The present invention has the following specific advantages:

[0040] The present invention employs a modular design, cutting a sheet of fixed thickness into several modular pieces of varying sizes and shapes. These modular pieces are then spliced ​​together during the compression and vulcanization process. This not only allows for controllable thickness across various regions of the glove, but also facilitates uniform pressure distribution and improves the material's isotropic consistency. This overcomes the problem of traditional monolithic molding methods, which suffers from poor isotropic material consistency, resulting in poor thickness uniformity and low molding precision due to the limitations of the mold cavity structure. Specifically, in some products, the palm portion requires a thicker thickness to withstand various mechanical hazards, while the arm portion requires a moderate thickness to provide good protection while ensuring wearer comfort. Therefore, in step 8), the third sheet is cut to the shape and dimensions of the second sheet. In step 9), the modular pieces of varying sizes and shapes are placed into the glove mold according to the predetermined splicing positions. The second and third sheets are then stacked and compression vulcanized. After demolding, a glove box protective glove with varying thicknesses in the palm and arm portions is produced.

[0041] The present invention sets the mixing temperature at 70-160° C., which is higher than the melting point of most additives, thereby facilitating uniform mixing of the additives and also facilitating the removal of moisture from the rubber mix, thereby ensuring the yield and quality of the glove products and improving the production efficiency.

[0042] Other features and advantages of the present invention will be set forth in the following description or may be learned by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the combined structure of module pieces of different shapes according to an embodiment of the present invention.

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

[0045] In the figure: 1. Large trapezoidal unit cell; 2. Medium trapezoidal unit cell; 3. Large bow-shaped unit cell; 4. Small bow-shaped unit cell; 5. Curved-edge trapezoidal unit cell; 6. Small trapezoidal unit cell; 7. Palm part; 8. Arm part. DETAILED DESCRIPTION

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

[0047] The present invention provides a high-precision molding method for glove box protective gloves, comprising the following steps:

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

[0049] 2) Adding plasticizer, antioxidant and active agent into internal mixer for primary mixing;

[0050] 3) Add reinforcing agent and shielding component for secondary mixing, and perform binder removal after reaching the set time and temperature;

[0051] 4) The discharged rubber is passed through an open mill to obtain a stage A mixed rubber, and the mixed rubber is kept at a set temperature for a set time;

[0052] 5) putting the mixed rubber, vulcanizing agent and accelerator of stage A into an internal mixer and mixing them three times, and then performing the discharge after reaching the set time and temperature;

[0053] 6) The discharged rubber is passed through an open mill to obtain a stage B mixed rubber;

[0054] 7) feeding the mixed rubber of stage B into a calender and rolling the mixed rubber into a sheet of fixed thickness each time;

[0055] 8) Based on modular design, cutting the sheet into a plurality of modular pieces of different sizes and shapes;

[0056] 9) placing the modular pieces of different sizes and shapes into a glove mold according to the set splicing positions for compression molding and vulcanization, and then demolding to obtain the glove box protective gloves.

[0057] This application utilizes a modular design, cutting a sheet of material of fixed thickness into several modular pieces of varying sizes and shapes. These modular pieces are then joined together during the compression and vulcanization process to form the glove. This design not only allows for controllable thickness across different regions of the glove, but also facilitates uniform pressure distribution and improves the material's isotropic consistency. This addresses the issue of traditional monolithic molding methods, which, due to the limitations of the mold cavity structure, results in poor isotropic material consistency, resulting in poor thickness uniformity and low molding precision.

[0058] The sheet material calendered by the calendering machine in this application has a thickness range of 0.6 to 2.5 mm. Through modular splicing and forming, gloves with thickness grades including 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 length of the gloves produced is (700-800) ±5 mm, the cuff diameter is (150, 165, 180, 200, 285) ±2 mm, and the glove hem diameter is 5 ±0.5 mm.

[0059] As a specific embodiment, the size of the glove mold of the present 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 the present application is 60-100°C; the primary mixing temperature is 70-120°C;

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

[0062] The three mixing temperatures are 70-120°C;

[0063] The roller temperature of the calender is 40-95°C;

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

[0065] The mixing temperature in this application is set at 70-160°C, which is higher than the melting point of most additives, thereby facilitating uniform mixing of the additives and also facilitating the removal of moisture from the rubber mix, thereby ensuring the yield and quality of the glove products and improving production efficiency.

[0066] As a specific embodiment, the module sheets of different sizes and shapes include a first sheet and a second sheet;

[0067] The first piece is a trapezoidal structure, and the second piece is a major arc shape;

[0068] The thickness of the first sheet and the second sheet are the same or different.

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

[0070] The second piece corresponds to the palm part, and 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 direction of the glove; the small trapezoidal unit piece 6 is an isosceles trapezoid, and the curved trapezoidal unit piece 5 has an arc-shaped side.

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

[0072] See also Figure 2 ,and Figure 1 Same, Figure 2On both sides of the middle dotted line are the palm portion 7 and the arm portion 8. In some products, the palm portion 7 needs to be thicker to cope with various mechanical hazards, and the arm portion 8 needs to be moderately thick to provide good protection while ensuring wearing comfort.

[0073] Therefore, in some specific embodiments, the thickness of the first sheet is less than that of the second sheet. Alternatively, the thickness of the first sheet is the same as that of the second sheet. In step 8), a third sheet is cut to the shape and size of the second sheet, and the third sheet is made of nylon fabric. In step 9), the modular sheets of different sizes and shapes are placed into a glove mold according to the predetermined splicing positions. The second sheet and the third sheet are then stacked and press-vulcanized. After demolding, a glove box protective glove having different thicknesses in the palm portion 7 and the arm portion 8 is produced.

[0074] For other products, the requirements for different partitions of the gloves are also different. Therefore, whether the thickness of the first and second pieces are the same, and whether a third piece is needed, are determined according to actual needs to meet the requirements of different products.

[0075] Therefore, through modular design, the present application can select different mixed rubber sheets for use in the same glove, thereby achieving functional combination and zoning.

[0076] As a specific embodiment, the plasticizing time is 30s to 2min;

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

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

[0079] The three mixing times are 30s to 4min, and the corresponding binder removal temperature is 70 to 120°C;

[0080] The molding vulcanization time is 8 to 15 minutes.

[0081] As a specific embodiment, when preparing the stage A rubber mix, the open mill is thinned 3 to 5 times and parked at 15 to 30° C. for 8 hours; when preparing the stage B rubber mix, the open mill is thinned 3 to 5 times.

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

[0083] The solutions of this application are further illustrated below with specific examples.

[0084] Example 1:

[0085] A high-precision molding method for glove box protective gloves, comprising:

[0086] 1) Put the rubber into the internal mixer and plasticize for 30 seconds.

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

[0088] 3) Add reinforcing agent and shielding component for secondary mixing, and remove glue when the temperature reaches 160℃.

[0089] 4) The discharged rubber is passed through an open mixing mill to obtain a stage A mixed rubber, which is then kept at a certain temperature for more than 8 hours.

[0090] 5) The mixed rubber of stage A, the vulcanizing agent and the accelerator are put into an internal mixer and mixed three times. When the temperature reaches 90° C., the rubber is discharged.

[0091] 6) The discharged rubber is passed through an open mill to obtain a stage B mixed rubber;

[0092] 7) The mixed rubber of stage B is fed into a calender and rolled into a sheet with a thickness of 2 mm ± 0.05 mm. After cooling, the sheet is rolled or cut.

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

[0094] Specifically, according to the characteristics of the hand shape, which is wide at the upper arm, second at the palm, and thinnest at the wrist, and the hand is long and short, the module chip is designed as a large trapezoidal unit chip (at the arm) and a large arched unit chip (at the palm), such as Figure 1 As shown in (a).

[0095] Among them, the large trapezoidal unit piece is an isosceles trapezoid with dimensions of 8 cm on the short side, 18 cm on the long side, and 50 cm in height;

[0096] The large bow unit piece is a major arc bow with dimensions of 6 cm radius and 8 cm chord length.

[0097] 9) The modular pieces of different sizes and shapes are placed in a glove mold according to the predetermined splicing positions and subjected to compression vulcanization at 160° C. for 12 minutes. After demolding, 165 mm × 1.0 mm × 750 mm glove box protective gloves are produced.

[0098] Specifically, the composition ratio of this embodiment is:

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

[0100] Example 2

[0101] A high-precision molding method for glove box protective gloves, comprising:

[0102] 1) Put the EPDM rubber into the internal mixer and plasticate for 60 seconds.

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

[0104] 3) Add reinforcing agent and shielding component for secondary mixing, and remove glue when the temperature reaches 140℃.

[0105] 4) The discharged rubber is passed through an open mixing mill to obtain a stage A mixed rubber, which is then kept at a certain temperature for more than 8 hours.

[0106] 5) The mixed rubber of stage A, the vulcanizing agent and the accelerator are put into an internal mixer and mixed three times. When the temperature reaches 95° C., the rubber is discharged.

[0107] 6) The discharged rubber is passed through an open mixing mill to obtain the B-stage mixed rubber.

[0108] 7) The mixed rubber of stage B is fed into a calender and calendered into a sheet with a thickness of 0.6 mm ± 0.05 mm. After cooling, the sheet is rolled or cut.

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

[0110] Specifically, according to the characteristics of the hand shape, which is wide at the upper arm, second at the palm, and thinnest at the wrist, and the characteristics of long arms and short hands, the module piece is designed into two middle trapezoidal unit pieces (at the arm), two curved trapezoidal unit pieces and one small arched unit piece (at the palm), as shown in the following figure. Figure 1 As shown in (b).

[0111] in:

[0112] The two middle trapezoidal unit pieces 1 are both isosceles trapezoidal with gradually varying areas and sizes as follows:

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

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

[0115] The small bow unit piece is a major arc bow with dimensions of 9 cm radius and 8 cm chord length.

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

[0117] 9) The modular pieces of different sizes and shapes are placed in a glove mold according to the predetermined splicing positions and subjected to compression vulcanization at 160° C. for 15 minutes. After demolding, a glove box protective glove of 180 mm × 0.4 mm × 800 mm is produced.

[0118] Specifically, the composition ratio of this embodiment is:

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

[0120] Example 3:

[0121] A high-precision molding method for glove box protective gloves, comprising:

[0122] 1) Put the rubber into the internal mixer and plasticize for 60 seconds.

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

[0124] 3) Add reinforcing agent and shielding component for secondary mixing, and remove glue when the temperature reaches 110℃.

[0125] 4) The discharged rubber is passed through an open mill to obtain a stage A mixed rubber, which is then kept at a certain temperature for more than 8 hours;

[0126] 5) putting the mixed rubber of stage A, the vulcanizing agent and the accelerator into an internal mixer and mixing them three times, and draining the rubber when the temperature reaches 80°C;

[0127] 6) The discharged rubber is passed through an open mill to obtain a stage B mixed rubber;

[0128] 7) feeding the rubber mix of stage B into a calender and rolling it into a sheet with a thickness of 2.5 mm ± 0.05 mm, and then winding or cutting it after cooling;

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

[0130] Specifically, according to the characteristics of the hand shape, which is wide at the upper arm, second at the palm, thinnest at the wrist, and long arms and short hands, the module chip is designed into three medium trapezoidal unit chips (at the arm), a small arched unit chip and a small trapezoidal unit chip (at the palm), such as Figure 1 As shown in (c).

[0131] in:

[0132] The three middle trapezoidal units are all isosceles trapezoidal with gradually changing areas. Their sizes are:

[0133] Medium trapezoidal unit A: short side 8cm, long side 11cm, height 8cm;

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

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

[0136] The small arc unit piece is a major arc arc with dimensions of 7 cm radius and 7 cm chord length;

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

[0138] 9) The modular pieces of different sizes and shapes are placed in a glove mold according to the set splicing positions and compression-vulcanized at 160° C. for 10 minutes. After demolding, a 200 mm×0.8 mm×800 mm glove box protective glove is produced.

[0139] Specifically, the composition ratio of this embodiment is:

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

[0141] Example 4:

[0142] 1) Put the rubber into the internal mixer and plasticize for 60 seconds.

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

[0144] 3) Add reinforcing agent and shielding component for secondary mixing, and remove glue when the temperature reaches 110℃.

[0145] 4) The discharged rubber is passed through an open mixing mill to obtain a stage A mixed rubber, which is then kept at a certain temperature for more than 8 hours.

[0146] 5) The mixed rubber of stage A, the vulcanizing agent and the accelerator are put into an internal mixer and mixed three times. When the temperature reaches 80° C., the rubber is discharged.

[0147] 6) The discharged rubber is passed through an open mill to obtain a stage B mixed rubber;

[0148] 7) The mixed rubber of stage B is fed into a calender and rolled into a sheet with a thickness of 1.5 mm ± 0.05 mm. After cooling, the sheet is rolled or cut.

[0149] 8) Based on modular design, the sheet is cut into several modular pieces of different sizes and shapes. Specifically, according to the characteristics of the hand shape, which is wide at the upper arm, the palm is the second largest, and the wrist is the thinnest, and the hand is long and short, the modular piece is designed into a large trapezoidal unit piece (at the arm) and a large arched unit piece (at the palm), such as Figure 1 As shown in (a).

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

[0151] The large bow unit piece is a major arc bow with dimensions of 8 cm radius and 8 cm chord length.

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

[0153] 9) The modular sheets of varying sizes and shapes are placed into a glove mold according to the predetermined splicing positions. The nylon fabric sheet and the large bow-shaped unit sheet are then stacked. The mold is press-cured at 160°C for 12 minutes. After demolding, a 165 mm × (1.0-1.2) mm × 750 mm glove box protective glove is produced. The nylon fabric is located on the outer palm layer of the glove, and the corresponding rubber layer is located on the inner palm layer.

[0154] Specifically, the composition ratio of this embodiment is the same as that of embodiment 3:

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

[0156] Example 5

[0157] 1) Put the rubber into the internal mixer and plasticize for 30 seconds.

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

[0159] 3) Add reinforcing agent and shielding component for secondary mixing, and remove glue when the temperature reaches 160℃.

[0160] 4) The discharged rubber is passed through an open mixing mill to obtain a stage A mixed rubber, which is then kept at a certain temperature for more than 8 hours.

[0161] 5) The mixed rubber of stage A, the vulcanizing agent and the accelerator are put into an internal mixer and mixed three times. When the temperature reaches 90° C., the rubber is discharged.

[0162] 6) The discharged rubber is passed through an open mill to obtain a stage B mixed rubber;

[0163] 7) The mixed rubber of stage B is fed into a calender and rolled into a sheet with a thickness of 2 mm ± 0.05 mm. After cooling, the sheet is rolled or cut.

[0164] 8) Based on modular design, the sheet is cut into several modular pieces of different sizes and shapes. Specifically, according to the characteristics of the hand shape, which is wide at the upper arm, the palm is the second largest, and the wrist is the thinnest, and the hand is long and short, the modular piece is designed into a large trapezoidal unit piece (at the arm) and a large arched unit piece (at the palm), such as Figure 1 As shown in (a).

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

[0166] The large bow unit piece is a major arc bow with dimensions of 6 cm radius and 8 cm chord length.

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

[0168] 9) The modular sheets of varying sizes and shapes are placed into a glove mold according to the predetermined splicing positions. The nylon fabric sheet and the large bow-shaped unit sheet are then stacked. The mold is press-cured at 160°C for 12 minutes. After demolding, a 165 mm × (1.0-1.2) mm × 750 mm glove box protective glove is produced. The nylon fabric is located on the outer palm layer of the glove, and the corresponding rubber layer is located on the inner palm layer.

[0169] Specifically, the composition ratio of this embodiment is the same as that of embodiment 1:

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

[0171] Comparative Example 1

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

[0173] 2) Add plasticizer, antioxidant, surfactant and other additives and mix for 3 minutes;

[0174] 3) Add reinforcing agent, shielding component, etc. for secondary mixing, and remove glue when the temperature reaches 140℃;

[0175] 4) Open the mill and thin it out to produce the A-stage mixed rubber, which is then kept at a certain temperature for more than 8 hours;

[0176] 5) Put the mixed rubber, vulcanizing agent, accelerator, etc. of stage A into the internal mixer and mix them three times. When the temperature reaches 95℃, discharge the rubber;

[0177] 6) The discharged rubber is passed through an open mill to obtain a stage B mixed rubber;

[0178] 7) Put the mixed rubber of stage B into the extruder and calender to form a sheet with variable thickness. After cooling, the sheet is rolled or cut;

[0179] 8) The sheet was placed in a glove mold and vulcanized at 160° C. for 15 min. After demolding, a glove box protective glove with a size of 180 mm × 0.4 mm × 800 mm was obtained.

[0180] Specifically, the composition ratio of this comparative example is the same as that of Example 2:

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

[0182] One glove box protective glove was prepared for each of the above Examples and Comparative Example 1. The palm thickness, forearm thickness, upper arm thickness, length, cuff diameter, and hem diameter of each glove were measured. Thickness measurements were taken at five different locations. The test results are shown in Table 1.

[0183] Table 1 Measurement results of gloves obtained in various examples and comparative examples

[0184]

[0185]

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

[0187] Those skilled in the art will understand that the foregoing descriptions are merely preferred embodiments of the present invention and are 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 will be able to modify the technical solutions described in the foregoing embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A high-precision molding method for glove box protective gloves, characterized in that: The following steps are involved: 1) Put the rubber into an internal mixer for plasticization; 2) Adding plasticizer, antioxidant and activator to the internal mixer for mixing; 3) Add reinforcing agent and shielding component for secondary mixing, and perform debonding after reaching the set time and temperature; 4) The discharged rubber is passed through an open mixing mill to obtain a stage A mixed rubber, and the mixed rubber is kept at a set temperature for a set time; 5) putting the mixed rubber, vulcanizing agent and accelerator of stage A into an internal mixer, mixing for three times, and performing rubber discharge after reaching the set time and temperature; 6) The discharged rubber is passed through an open mixing mill to obtain a B-stage mixed rubber; 7) putting the mixed rubber of stage B into a calender and calendering it into a sheet with a fixed thickness each time; 8) Based on modular design, the sheet is cut into a plurality of modular sheets of different sizes and shapes; 9) placing the module sheets of different sizes and shapes into a glove mold according to the set splicing positions for compression vulcanization, and obtaining the glove box protective gloves after demoulding.

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 three mixing temperatures are 70-120°C; The roller temperature of the calender is 40-95°C; The molding vulcanization temperature is 150-170°C.

3. The method according to claim 1, characterized in that: The sheet calendered by the calender has a thickness range of 0.6 to 2.5 mm and a thickness dimensional accuracy of 0.1 mm.

4. The method according to claim 1, characterized in that The module sheet includes a first sheet and a second sheet, the first sheet is a trapezoidal structure, and the second sheet is a major arc shape.

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

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

7. The method according to claim 1, characterized in that Measured by cuff diameter×thickness×length, the size of the glove mold is (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 30s to 2min; The mixing time is 1 to 4 minutes; The secondary mixing time is 2 to 6 minutes, and the corresponding debinding temperature is 100 to 160°C; The three mixing times are 30s to 4min, and the corresponding debinding temperature is 70 to 120°C; The molding vulcanization time is 8 to 15 minutes.

9. The method according to claim 1, characterized in that: When preparing the A-stage rubber mix, the open mill is thinly passed 3 to 5 times and is parked at 15 to 30° C. for 8 hours; when preparing the B-stage rubber mix, the open mill is thinly passed 3 to 5 times.

10. The method according to claim 1, characterized in that The rubber includes one or a mixture of EPDM rubber, butyl rubber, halogenated butyl rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber.

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