Modeling forming and use performance evaluation method of glove box protective gloves

Abstract

The invention provides a glove box protective glove modeling forming and use performance evaluation method, according to the method, a hand-shaped mold is obtained through a hand three-dimensional modeling and 3D printing method, the glove is prepared through the processes of dip forming, casting forming and the like, and the use performance of the formed glove is evaluated through a wearing performance test and a fatigue sense test. Wherein the hand mold is made of a high-performance photosensitive resin material, and the shackle that expensive materials such as alloy and ceramic are mostly adopted in a traditional glove forming process is broken; the evaluation results of the wearing performance test and the fatigue feeling test are directly associated to whether the initial modeling size is appropriate or not, the modeling size is correspondingly modified according to the results, and a circulation process is started until the most comfortable glove size is obtained. The rapid modeling, efficient forming and use performance evaluation method for the glove box protective gloves is simple in process and obvious in effect, time and cost are saved to a greater extent, and a new thought and a reliable basis are further provided for size improvement of rubber gloves in different fields.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear radiation protection materials, and in particular to a modeling and forming method of a glove box protective glove and a method for evaluating its performance in use. Background Art

[0002] In the nuclear industry, workers need to wear multiple layers of protective gloves during operations to protect them from radiation, chemicals, nuclear waste, etc. Multi-layer gloves are designed to provide comprehensive protection, but they may also affect operational dexterity and increase fatigue when worn for a long time. Therefore, the wearing effect of the last layer of protective gloves is crucial. It not only needs to provide adequate protection, but also should take into account the convenience and comfort of wearing.

[0003] The protective gloves commonly used in the nuclear industry are mostly made of rubber. The preparation and evaluation of rubber protective gloves is a complex process involving multiple steps. First, it is necessary to select a suitable rubber material and design a rubber formula according to the expected performance of the gloves; then mix the rubber material with various additives to ensure uniform distribution; then use the glove mold to form the rubber material into the shape of the glove by means of dipping, calendering, and compression molding. The performance evaluation of rubber protective gloves includes physical performance tests such as tensile strength, elongation, tear resistance, and puncture resistance, chemical performance tests such as oil resistance, acid and alkali resistance, and protective performance tests such as radiation protection and chemical penetration resistance. The evaluation of the convenience, comfort, and fatigue of wearing rubber gloves is mainly based on the subjective feelings of the users. The direct feelings in actual use help improve the design of gloves and reduce the fatigue caused by long-term wearing. Although this method can provide a reference for the design of gloves to a certain extent, it is too subjective and cannot provide comparable objective data. At present, there is a lack of objective evaluation methods for the wearing performance of rubber protective gloves. Therefore, it is necessary to seek more objective means to evaluate the wearing performance of the prepared rubber gloves, and obtain modification suggestions for size design based on the evaluation results to ensure that the rubber gloves with the most wearing comfort are obtained.

[0004] Existing glove box protective glove molds are mostly made of expensive materials such as ceramics, stainless steel, and alloys, and the material selection is relatively limited. Although these materials have advantages such as smooth surface and corrosion resistance, they are expensive to make. In particular, ceramic materials have low strength and are easily damaged, which greatly increases the replacement cost. The evaluation of the performance of rubber gloves, such as the convenience, comfort, and fatigue of operation, is mostly based on the subjective feelings of the users, which is too subjective to provide comparable objective data. The methods of modeling, mold preparation, glove preparation, and evaluation of glove box protective gloves are relatively complicated. Summary of the invention

[0005] The present invention aims to provide a method for modeling and evaluating the performance of glove box protective gloves in view of the defects of the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for modeling and evaluating the performance of glove box protective gloves, characterized by comprising the following steps:

[0008] S1: Collect the hand size data of operators after multiple protections in actual application scenarios, calculate the average hand size, and establish a three-dimensional hand model based on the average hand size;

[0009] S2: Based on the three-dimensional hand model, a protective glove mold is obtained by 3D printing;

[0010] S3: preparing the glove forming raw materials into a compound latex, and preparing the protective gloves by a dipping molding or casting molding method;

[0011] S4: Evaluate the performance of the gloves through wearing performance test and fatigue test;

[0012] S5: modify the size of the three-dimensional hand model, and repeat steps S2-S5 until a protective glove with suitable performance is obtained.

[0013] Furthermore, the wearing performance test includes selecting testers whose finger sizes are closest to the size of the protective gloves, and after the hands are subjected to multiple protections according to the actual nuclear radiation protection scenario, recording the time from picking up the protective gloves to the fingers being fully inserted into the gloves, accurate to 0.01s, and wearing each glove three times. The average time of the three wearing times is calculated as the time the tester wears the gloves.

[0014] Furthermore, the fatigue test utilizes a physiological testing instrument to perform a grip strength test, and the strength of the physiological testing instrument is adjusted to 20% of the test subject's maximum grip strength, so that the test subject grips and releases the physiological testing instrument at the same frequency and times the test; when the test subject self-perceives that a certain fatigue level has been reached, the timing is paused and the duration and number of grips are quickly recorded, and then the fatigue test is continued, and the above steps are repeated until the test subject is completely fatigued; the fatigue levels include no obvious fatigue, mild fatigue, moderate fatigue, severe fatigue, and complete fatigue.

[0015] Furthermore, the dipping molding includes dipping the protective glove mold soaked with a coagulant into the compound latex, and then slowly lifting it up to form a rubber film on the surface of the mold.

[0016] Furthermore, the casting molding includes injecting the compound latex into the gap of the protective glove mold shell and forming the gloves after vulcanization.

[0017] Furthermore, the protective glove mold is made of high temperature resistant resin or photosensitive resin material.

[0018] Furthermore, a handle is provided at the tail of the three-dimensional hand model.

[0019] Furthermore, the glove molding raw materials include natural rubber latex, chloroprene rubber latex, and butyl latex.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention includes four important steps: modeling - 3D printing mold - dipping / casting molding - wearing performance and fatigue evaluation. The advantages and disadvantages of the initial modeling size are obtained according to the evaluation results, and corresponding modifications are made and then a cycle process is entered. This method can provide new ideas and reliable basis for the size improvement of gloves in different fields.

[0022] (2) The present invention evaluates the performance of gloves through wearing performance test and fatigue test, so that the wearing and fatigue performance of gloves can be presented through objective numerical values, which improves the current situation of evaluating the performance of gloves based on subjective comfort and fills the gap in the current glove performance evaluation system. The results of glove wearing performance and fatigue test can be compared with each other under the condition of controlling variables.

[0023] (3) Natural rubber latex, chloroprene latex and butyl latex are selected as glove molding materials. The latex under the corresponding formula system is impregnated or cast to produce gloves of a certain thickness and hardness. The dipping method and casting method are used to prepare rubber gloves. The most suitable molding process can be selected according to the characteristics of different rubbers, and the applicability is strong.

[0024] (4) The present invention establishes a three-dimensional model and further adopts a 3D printing method to obtain a glove mold that is resistant to high temperature, resistant to corrosion by chemical reagents, has a smooth surface, and is easy to demold, thereby reducing the mold manufacturing cost and broadening the range of mold material selection for the glove molding process, which is of great significance to the innovation of glove mold materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a schematic flow chart of the modeling and performance evaluation method of the glove box protective gloves of the present invention. DETAILED DESCRIPTION

[0026] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0027] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a method for modeling and forming a glove box protective glove and evaluating its performance, which specifically includes the following steps:

[0028] S1: Collect as much hand size data of operators after multiple protections in actual application scenarios as possible, and calculate the average hand size. In order to meet the requirements of subsequent preparation processes and the comfort of wearing gloves, the measured hand size is appropriately adjusted. Based on the above hand size, a three-dimensional hand model is established. In order to facilitate subsequent experimental operations, a handle part is designed at the end of the three-dimensional hand model. The handle part can provide a good grip and operational flexibility, so that operators can perform experimental operations more freely and improve operational efficiency; it can also effectively avoid contact between hands and chemical reagents and protect the safety of operators.

[0029] S2: Based on the three-dimensional model of the hand, a protective glove mold is obtained by 3D printing. Considering the needs of subsequent glove production processes (dip molding, casting molding, etc.), the selected materials for 3D printing need to meet the requirements of high temperature resistance, easy demoulding, smooth surface (surface roughness Ra < 5μm), and chemical corrosion resistance, and materials such as ceramics, aluminum alloys and stainless steel are used as new glove molding mold materials. At present, the more mature 3D printing processes on the market mainly include melt deposition, powder molding, and photocuring molding. The melt deposition process is represented by ABS resin, with obvious boundaries between layers, not smooth enough, and the use temperature of ABS is low; the powder molding process is represented by nylon, and the product surface has obvious granularity and large roughness; the photocuring molding process mostly uses photosensitive resins, which are of many types, smooth product surface, and good resistance to chemical solvent corrosion. Among them, high-temperature resistant photosensitive resins are important materials for new glove molding molds. A red translucent high-temperature resistant resin, GH100, produced by Shenzhen Youlian Manufacturing Co., Ltd., was selected as the 3D printing material for the nuclear radiation protection glove mold. Its operating temperature is as high as 150°C, it is dimensionally stable, has good rigidity, and is suitable for rapid molds and products requiring temperature resistance. The specific properties of GH100 are shown in Table 1. It has excellent mechanical properties, thermal stability, and chemical resistance, and can withstand the complex chemical environment during the molding process of rubber protective gloves and the high temperature during vulcanization. Therefore, it can be used for the preparation of nuclear radiation rubber protective gloves by processes such as dipping molding and casting molding.

[0030] Table 1 GH100 performance parameters

[0031] performance Numeric Tensile modulus 3235MPa Tensile Strength 42.7MPa Elongation at break 1.5％ Flexural modulus 3165MPa Shore Hardness 83HD Thermal deformation 150℃

[0032] In addition to GH100, UTR Perform, another product of Shenzhen Youlian Manufacturing Co., Ltd., has excellent performance: tensile modulus up to 9800MPa, flexural modulus 9030MPa, hardness 93HD, heat deformation temperature up to 260℃; other photosensitive resins such as Carbon's cyanate ester also have high strength and excellent thermal stability, etc. These materials can be used as 3D printing mold materials. High-performance photosensitive resins have great potential in replacing ceramics, aluminum alloys, and stainless steel as glove molding mold materials.

[0033] S3: Select natural latex, chloroprene latex, and butyl latex as raw materials for glove molding, prepare the raw materials for glove molding into compound latex, and make protective gloves by dipping molding or casting molding. Among them, dipping molding is to immerse the protective glove mold soaked in coagulant into the compound latex, and then slowly lift it up to form a film on the surface of the mold. Casting molding is to inject the compound latex into the gap of the protective glove mold shell (the shell / body shape is the same, and the thickness of the obtained glove is the gap thickness), and then vulcanize to form the gloves.

[0034] S4: Evaluate the performance of the gloves through wearing performance test and fatigue test. Among them, the wearing performance test includes selecting a tester whose finger size is closest to the size of the protective gloves. After the hands are multiple-protected according to the actual nuclear radiation protection scenario, the time from picking up the protective gloves to the fingers being fully inserted into the gloves is recorded, accurate to 0.01s. Each glove is worn 3 times, and the average time of the 3 wearing times is calculated as the time the tester wears the gloves. The fatigue test uses a physiological test instrument to test the grip strength. The physiological test instrument is composed of a spring, a handle and a counter. The force can be adjusted. The purpose of evaluating the hand fatigue index can be achieved by holding the handle with the hand to pull the spring apart. The strength of the physiological test instrument is adjusted to 20% of the tester's maximum grip strength, so that the tester grips and releases the physiological test instrument at the same frequency and counts. When the tester's self-perception reaches a certain fatigue level, the timing is paused and the duration and grip strength are quickly recorded, and then the fatigue test is continued. Repeat the above steps until the tester is completely fatigued. The fatigue levels include no obvious fatigue, mild fatigue, moderate fatigue, severe fatigue, and complete fatigue. The fatigue level and fatigue status comparison table of the fatigue test is shown in Table 2.

[0035] Table 2: Fatigue test comparison table

[0036] Fatigue level Fatigue status Status description 1 No obvious fatigue No difference from the initial feeling 2 Mild fatigue Slightly grip 3 Moderate fatigue Grip 4 Severe fatigue It takes a lot of force to hold it 5 Complete fatigue Can't hold it at all

[0037] S5: modify the size of the three-dimensional hand model, and repeat steps S2-S5 until a protective glove with suitable performance is obtained.

[0038] Example 1

[0039] According to the above method, natural rubber latex is used as a glove molding raw material to prepare a compound latex, and a latex glove with a thickness of about 1 mm is prepared by a dipping molding method. After the glove is worn, it fits the palm well, and a wearing performance test and a fatigue test are performed on it.

[0040] Example 2

[0041] The model size is the same as that used in Example 1. According to the above method, natural rubber latex is used as the glove molding raw material to prepare the compound latex, and a latex glove with a thickness of about 1 mm is prepared by the casting molding method. The wearing performance test and fatigue test are also performed on the latex.

[0042] Example 3

[0043] The model size is the same as that used in Example 1. According to the above method, chloroprene latex is used as the glove molding raw material to prepare a compound latex, and a latex glove with a thickness of about 1 mm is prepared by a dipping molding method. The wearing performance test and fatigue test are also performed on the latex.

[0044] Example 4

[0045] The model size is the same as that used in Example 1. According to the above method, butyl latex is used as the glove molding raw material to prepare the compound latex, and the latex gloves with a thickness of about 1 mm are prepared by the dipping molding method. The wearing performance test and fatigue test are also performed on the latex gloves.

[0046] The results of the wearing performance test and fatigue test of Examples 1-4 are shown in Table 3, Table 4 and Table 5, respectively. Due to the consistency of the glove sizes, the wearing time of the four gloves is relatively close. Although the gloves are of the same size, the fatigue test results of the gloves are different due to the difference in hardness of the gloves prepared under different rubber formula systems, while the fatigue test results of the gloves prepared by different processes with the same rubber are relatively close. The gloves prepared by natural latex are softer, and the stress on the workers when wearing them is less, so they are more fatigue-resistant and have the best performance.

[0047] Table 3 Wearing performance test results of Examples 1-4

[0048] Example 1 2 3 4 Wearing time / s 2.93 2.97 3.03 3.03

[0049] Table 4 Fatigue test results of Examples 1-4

[0050]

[0051] Table 5 Fatigue test results of Examples 1-4 2

[0052]

[0053] Example 5

[0054] According to the performance test process and results of Examples 1-4, the model was modified for the area of ​​the hand that was subjected to the greatest stress during the test, the mold was reprinted, and natural rubber latex gloves were prepared using the same material formulation and process conditions as in Example 1, and the wearing performance test and fatigue test were also performed on them. The wearing time of the gloves obtained in Example 5 was 2.62 s, the time to reach fatigue levels 1-5 was 11 s, 20 s, 3 s, 41 s and 59 s respectively, and the number of grips to reach fatigue levels 1-5 was 15 times, 28 times, 41 times, 52 times and 68 times respectively.

[0055] Example 6

[0056] According to the performance test results of Example 5, the glove model was modified again, the mold was reprinted, and natural rubber latex gloves were prepared by the same material formula and process conditions as in Example 1, and the wearing performance test and fatigue test were also performed on them. The wearing time of the gloves obtained in Example 6 was 2.45s, the time to reach fatigue levels 1-5 was 12s, 20s, 36s, 50s and 63s respectively, and the number of grips to reach fatigue levels 1-5 was 16 times, 28 times, 44 times, 59 times and 75 times respectively.

[0057] From the above examples, it can be seen that Example 6 is the glove that best meets the requirements. After the protective glove modeling-printing mold-molding-evaluation process is cyclically carried out, the optimal size of the last layer of gloves under the multi-layer protection of workers in the nuclear industry is determined, which can minimize the fatigue during use and ensure the wearing comfort. This method is also applicable to other fields involving hand protection and glove preparation and evaluation. The results of the glove wearing performance and fatigue test support mutual comparison under the condition of controlling variables.

[0058] The above specific implementation methods are only for illustrating the technical concept and structural features of the present invention, and the purpose is to enable relevant persons familiar with this technology to implement it. However, the above content does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. A method for modeling and evaluating the performance of glove box protective gloves, characterized in that: The steps include: S1: Collect the hand size data of operators after multiple protections in actual application scenarios, calculate the average hand size, and establish a three-dimensional hand model based on the average hand size; S2: Based on the three-dimensional hand model, a protective glove mold is obtained by 3D printing; S3: preparing the glove forming raw materials into a compound latex, and preparing the protective gloves by a dipping molding or casting molding method; S4: Evaluate the performance of the gloves through wearing performance test and fatigue test; S5: modify the size of the three-dimensional hand model, and repeat steps S2-S5 until a protective glove with comfortable performance is obtained.

2. The method for modeling and evaluating the performance of a glove box protective glove according to claim 1, characterized in that: The wearing performance test includes selecting testers whose finger sizes are closest to the size of protective gloves, and after the hands are given multiple protections according to the actual nuclear radiation protection scenario, recording the time from picking up the protective gloves to the fingers being fully inserted into the gloves, accurate to 0.01s. Each glove is put on three times, and the average time of the three wearing times is calculated as the time the tester wears the gloves.

3. The method for modeling and evaluating the performance of a glove box protective glove according to claim 1, characterized in that: The fatigue test utilizes a physiological testing instrument to perform a grip strength test, and the strength of the physiological testing instrument is adjusted to 20% of the test subject's maximum grip strength, so that the test subject clench and release the physiological testing instrument at the same frequency and time is measured. When the test subject self-perceives that a certain fatigue level has been reached, the timing is paused and the duration and the number of grip strengths are quickly recorded, and then the fatigue test is continued. The above steps are repeated until the test subject is completely fatigued. The fatigue levels include no obvious fatigue, mild fatigue, moderate fatigue, severe fatigue, and complete fatigue.

4. The method for modeling and evaluating the performance of a glove box protective glove according to claim 1, characterized in that: The dipping molding comprises dipping the protective glove mold soaked with a coagulant into the compound latex, and then slowly lifting it up to form a rubber film on the surface of the mold.

5. The method for modeling and evaluating the performance of a glove box protective glove according to claim 1, characterized in that: The casting molding comprises injecting the compound latex into the gap of the protective glove mold shell and forming the gloves after vulcanization.

6. The method for modeling and evaluating the performance of a glove box protective glove according to claim 1, characterized in that: The protective glove mold is made of high temperature resistant resin or photosensitive resin material.

7. The method for modeling and evaluating the performance of a glove box protective glove according to claim 1, characterized in that: A handle is arranged at the tail of the three-dimensional hand model.

8. The method for modeling and evaluating the performance of a glove box protective glove according to claim 1, characterized in that: The glove molding raw materials include natural rubber latex, chloroprene rubber latex and butyl rubber latex.

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