Protective clothing product framework and development model based on engineering perspective

Abstract

Protective clothing product development is a typical complex engineering application problem, relates to multiple basic subjects and engineering technologies, and aims at solving the problem of how to effectively implement protective clothing product development in the clothing field in order to better understand multiple factors and correlativity in the protective clothing product development process. According to the invention, a protective clothing product framework with three levels of'foundation-support-application 'is provided based on the perspective of engineering around the idea of human ergonomics. According to a protective clothing product framework, a universal protective clothing product development model including four stages of problem definition, demand analysis, solution scheme and specific implementation, and field testing and shaping is provided, and the model has a good guiding effect on protective clothing product development.

Description

Technical Field

[0001] The present invention relates to the field of protective clothing product development, and particularly to a protective clothing product framework and a development model from an engineering perspective. Background Art

[0002] The progress of science and technology has greatly improved our quality of life and expanded the scope of human activities. However, during our life or work, we will inevitably encounter physical, chemical, and biological hazards, facing different forms of risk factors such as heat and cold, viruses, bacteria, chemical substances, and radiation. In the face of different hazards, humans have developed various effective protective measures, such as protective clothing.

[0003] Currently, the research and focus on protective clothing mainly concentrate on two aspects: the development of new materials and the evaluation of performance. The emergence of new technologies and new materials represented by high-performance fibers, nanotechnology, and intelligent technology has continuously improved the protection and comfort of protective clothing.

[0004] The development of protective clothing products involves multidisciplinary knowledge and technologies such as physics, materials, and chemistry. The development of protective clothing is different from the design and production of conventional clothing. It is a typical complex engineering application problem involving multiple basic disciplines and engineering technologies. Establishing a general protective clothing development model has important guiding significance for guiding the development of various protective clothing. However, how to better understand the many factors and their relationships in the process of protective clothing product development and how to effectively implement the development of protective clothing products in the clothing field are major problems in the field of protective clothing research. Summary of the Invention

[0005] Based on the idea of ergonomics and from an engineering perspective, the present invention proposes a protective clothing product framework at three levels: "foundation - support - application". According to the protective clothing product framework, a general protective clothing product development model including four stages: "definition of the problem - analysis of requirements - solution and specific implementation - on-site testing and finalization" is proposed. This model has good guiding effects on the development of protective clothing products.

[0006] According to the concept of modern ergonomics, the development of protective clothing products must be user-centered. Combining the actual application environment of protective clothing, full consideration should be given to the movement, physiological and psychological needs of users, which is the basis and starting point for the development of protective clothing products. On this basis, the development of protective clothing products is carried out using four core supports: clothing design, materials science, performance evaluation, and engineering technology. Clothing design mainly focuses on the design of the style and structure of protective clothing to meet the needs of protective styles and functions, while also taking into account the protection, comfort, and functional requirements of protective clothing; materials science mainly focuses on the development and selection of materials to meet the protection, comfort, and functional needs of protective clothing; performance evaluation provides evaluation methods for clothing materials and the overall performance of clothing, which is an essential technology for the development of protective clothing products; the development of protective clothing products involves multidisciplinary knowledge and is an engineering problem affected by multiple objectives and factors, requiring optimization among multiple different solutions. Therefore, engineering technologies such as experiments, theoretical analysis, or computer simulation calculations are needed for different implementations and evaluations.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: A protective clothing product framework, which is composed of three levels: "foundation - support - application". The foundation layer includes the application environment and the user. The application environment includes hazard factors and climatic conditions, and the user includes morphology and actions; the support layer includes engineering technology, materials science, performance evaluation, and clothing design; the application layer includes different types of protective clothing, and the different types of protective clothing include chemical protective clothing, bulletproof vests, and fire-fighting suits.

[0008] A development model for a general protective clothing from an engineering perspective, including problem definition, requirements analysis, solution and implementation, on-site testing and finalization. The development model follows three basic principles: the protection principle, the system principle, and the balance principle.

[0009] Optionally, the development model for the general protective clothing from an engineering perspective is based on the protective clothing product framework.

[0010] Optionally, the problem definition includes application environment information, user information, and work information. The application environment information includes harmful factors, climatic conditions, space, and other factors. Among them, the harmful factors include the category of hazard factors, the form of hazard factors, and the degree of harm; the climatic conditions include the temperature range, humidity range, and airflow range; the space includes the size of the working space, indoor or outdoor; the other factors include other environmental factors that may interact with the protective clothing. The user information includes gender, age, and body type characteristics. The work information includes the work process, work intensity, interaction with the environment, and working hours. The work process includes actions, the work intensity includes static or continuous movement or intermittent movement, and the interaction with the environment includes the category of interaction.

[0011] Optionally, the requirements analysis includes: (1) clarifying the type, series or single piece of the protective clothing and the protected parts, and selecting the corresponding standards for the protective clothing; (2) clarifying the requirements for the protective performance and wearing performance of the protective clothing fabric, and at the same time selecting the evaluation standards corresponding to various performance of the fabric; (3) clarifying the characteristics that the clothing style and structure should have, including the treatment and requirements of the split, one-piece or vest style and the opening parts; (4) clarifying the requirements for the ergonomic performance of the clothing, including the mobility, thermal comfort and the longest working time of the protective clothing, and the requirements are closely related to the ergonomic performance of the protective clothing; (5) finally forming two core results of the requirements analysis for the fabric performance requirements and the clothing style and structure requirements of the protective clothing.

[0012] Optionally, the solution and implementation go through multiple cycles of "design - implementation - evaluation - optimization", and finally obtain the solution of the protective clothing and get the protective clothing that meets the requirements.

[0013] Optionally, the solution and implementation include fabric selection and development, and the design and production of protective clothing.

[0014] Optionally, the fabric selection and development include three methods: selecting existing fabrics, developing new fabrics from scratch, and partially developing new fabrics; first, according to the fabric performance requirements and standard requirements, clarify the performance indicators of the fabric, and at the same time formulate an evaluation plan for the fabric performance indicators; then formulate a fabric development plan, the main content of which is the number of fabric layers, the performance requirements of each layer of fabric, materials and combination methods, and at the same time, a detailed fabric selection or development process needs to be formulated, and a reasonable experimental plan needs to be designed; then, according to the formulated plan, select or develop the fabric, and after obtaining the fabric, evaluate the protective and wearing performance of the fabric according to the evaluation plan, and focus on evaluating the overall protective and wearing performance of multi-layer fabrics. If the fabric cannot meet the requirements, it is necessary to re-review the fabric performance indicators or modify the fabric development plan, and repeat the above process until the fabric that meets the requirements is obtained.

[0015] Optionally, on the premise of ensuring safety, the design and manufacture of the protective clothing is centered around the wearer, considering the interaction between the human body - protective clothing - environment, and the cooperation with other protective equipment. The structure and style of the protective clothing are designed from an overall perspective to obtain a sample garment. The design and manufacture of the protective clothing include first clarifying the performance indicators of the protective clothing according to the performance and standard requirements of the clothing, and at the same time formulating an evaluation plan for the performance indicators of the protective clothing, such as harmful liquid barrier performance testing, human wearing tests, etc.; then designing the structure and style of the protective clothing according to the requirements of protection and ergonomic performance. The key points to be considered in the design are how the clothing can effectively protect the human body and how the wearer can efficiently carry out corresponding work after wearing the protective clothing; then making the sample garment. After the sample garment is made, combined with the performance evaluation plan of the protective clothing, a reasonable and scientific evaluation of the protective and ergonomic performance of the protective clothing sample is carried out. If the protective clothing sample fails to meet the protection or ergonomic performance, such as movement performance, it is necessary to re-review the performance indicators of the protective clothing or modify the clothing design plan, and repeat the process of making and evaluating the sample garment until the design requirements are met.

[0016] Optionally, field testing is also required before on-site testing and finalization. According to the 5-level evaluation system, field testing is a human wearing test, which is carried out in the order of limited field and large-scale field testing.

[0017] Optionally, the 5-level evaluation system is such that levels 1 and 2 are objective tests, level 3 is a wearing test, and levels 4 and 5 are on-site tests. Level 1 is fabric performance testing, level 2 is clothing performance testing, level 3 is a climate chamber clothing human test, level 4 is a restricted on-site test, and level 5 is an on-site test.

[0018] The beneficial effects of the present invention are as follows: Serving the development of protective clothing, based on the idea of human ergonomics and from an engineering perspective, this paper proposes a protective clothing product framework at three levels of "foundation - support - application". Through this framework, it is possible to better understand and master the different objects and technologies involved in the protective clothing product development process. On the basis of the protective clothing product framework, a protective clothing product development model is proposed, which includes four stages of "problem definition - requirement analysis - solution and implementation - on-site testing and finalization". This model is a general protective clothing development model applicable to the development of all protective clothing. The model details the work in different stages and has good guiding significance for the development of protective clothing.

[0019] The verification results show that the protective performance, thermal and moisture comfort, movement comfort, and aesthetic comfort of the chemical protective clothing developed by this model can meet the requirements, and this model has certain scientificity and stability, which has important guiding significance for the development of protective clothing. Description of the Drawings

[0020] Figure 1 It is the protective clothing product framework of the embodiment of the present invention; Figure 2 This is the development process of the chemical protection suit based on the model in the embodiments of the present invention; Figure 3 This is the development process of the liquid-tight chemical protection suit in the embodiments of the present invention. Specific embodiments

[0021] The following elaborates on the preferred embodiments of the present invention in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the protection scope of the present invention more clearly defined. Embodiment

[0022] A protective clothing product framework, which is composed of three levels: "foundation - support - application". The foundation layer includes the application environment and the user. The application environment includes hazard factors and climatic conditions. The user includes morphology and movements. The support layer includes engineering technology, materials science, performance evaluation, and clothing design. The application layer includes different types of protective clothing, and the different types of protective clothing include chemical protection suits, bulletproof vests, and fire protection suits. Embodiment

[0023] A development model of a general protective clothing from an engineering perspective, including problem definition, requirements analysis, solution and implementation, on-site testing and finalization. The development model follows three basic principles: the protection principle, the system principle, and the balance principle.

[0024] Optionally, the development model of the general protective clothing from an engineering perspective is based on the protective clothing product framework.

[0025] Optionally, the problem definition includes application environment information, user information, and work information. The application environment information includes harmful factors, climatic conditions, space, and other factors. Among them, the harmful factors include the category of hazard factors, the form of hazard factors, and the degree of harm. The climatic conditions include the temperature range, humidity range, and air flow range. The space includes the size of the working space and indoor or outdoor. The other factors include other environmental factors that may interact with the protective clothing. The user information includes gender, age, and body type characteristics. The work information includes the work process, work intensity, interaction with the environment, and working hours. The work process includes movements. The work intensity includes static or continuous movement or intermittent movement. The interaction with the environment includes the category of interaction.

[0026] Optionally, the requirements analysis includes: (1) clarifying the type of protective clothing, whether it is a series or a single piece, and the protected parts, and selecting the corresponding standards for protective clothing; (2) clarifying the requirements for the protective performance and wearing performance of the protective clothing fabric, and at the same time selecting the evaluation standards corresponding to various performance of the fabric; (3) clarifying the characteristics that the clothing style and structure should have, including the treatment and requirements of the split, one-piece or vest style, and the opening parts; (4) clarifying the requirements for the ergonomic performance of the clothing, including mobility, thermal comfort, and the longest working time of the protective clothing, and the requirements are closely related to the ergonomic performance of the protective clothing; (5) finally forming two core results of the requirements analysis for the fabric performance requirements of the protective clothing and the clothing style and structure requirements.

[0027] Optionally, the solution and implementation go through multiple cycles of "design - implementation - evaluation - optimization", and finally obtain the solution for the protective clothing, and obtain the protective clothing that meets the requirements.

[0028] Optionally, the solution and implementation include fabric selection and development, and the design and production of protective clothing.

[0029] Optionally, the fabric selection and development include three methods: selecting existing fabrics, newly developing new fabrics, and partially developing new fabrics; first, according to the fabric performance requirements and standard requirements, clarify the performance indicators of the fabric, and at the same time formulate an evaluation plan for the fabric performance indicators; then formulate a fabric development plan, the main content of which is the number of fabric layers, the performance requirements of each layer of fabric, materials and combination methods, and at the same time, a detailed fabric selection or development process needs to be formulated, and a reasonable experimental plan needs to be designed; then, according to the formulated plan, select or develop the fabric, and after obtaining the fabric, evaluate the protective and wearing performance of the fabric according to the evaluation plan, and focus on evaluating the overall protective and wearing performance of multi-layer fabrics. If the fabric cannot meet the requirements, it is necessary to re-review the fabric performance indicators or modify the fabric development plan, and repeat the above process until the fabric that meets the requirements is obtained.

[0030] Optionally, when designing and manufacturing the protective clothing, on the premise of ensuring safety and centered around the wearer, considering the interaction between the human body, the protective clothing, and the environment, and the coordination with other protective equipment, the structure and style of the protective clothing are designed from an overall perspective to obtain a prototype. The design and manufacturing of the protective clothing include first clarifying the performance indicators of the protective clothing according to the performance and standard requirements of the clothing, and formulating an evaluation plan for the performance indicators of the protective clothing, such as testing the barrier performance of harmful liquids and conducting human wearing tests; then designing the structure and style of the protective clothing according to the requirements of protection and ergonomic performance. The key points to be considered in the design are how the clothing can effectively protect the human body and how the wearer can efficiently carry out corresponding work after wearing the protective clothing; then making the prototype. After the prototype is made, combined with the performance evaluation plan of the protective clothing, a reasonable and scientific evaluation of the protective performance and ergonomic performance of the protective clothing prototype is carried out. If the protective clothing prototype fails to meet the protection or ergonomic performance, such as the movement performance, it is necessary to re-review the performance indicators of the protective clothing or modify the clothing design plan, and repeat the process of making the prototype and evaluation until the design requirements are met.

[0031] Optionally, field testing is also required before on-site testing and finalization. According to the 5-level evaluation system, field testing is a human wearing test, which is carried out in the order of limited field and large-scale field testing.

[0032] Optionally, the 5-level evaluation system is such that levels 1 and 2 are objective tests, level 3 is a wearing test, and levels 4 and 5 are on-site tests. Level 1 is a fabric performance test, level 2 is a clothing performance test, level 3 is a clothing human test in a climate chamber, level 4 is a limited on-site test, and level 5 is an on-site test. Embodiment

[0033] A development model of a liquid-tight chemical protective suit from an engineering perspective includes problem definition, requirements analysis, solution and implementation, field testing and finalization.

[0034] The usage method of the development model of the liquid-tight chemical protective clothing from an engineering perspective includes: (1) Problem definition step: Problem definition includes application environment information, user information, and work information. Application environment information includes harmful factors, climatic conditions, space, and other factors. Among them, harmful factors include the category of harmful factors, the form of harmful factors, and the degree of harm; climatic conditions include temperature range, humidity range, and air flow range; space includes the size of the working space, indoor or outdoor; other factors include other environmental factors that may interact with the protective clothing. User information includes gender, age, and body shape characteristics. Work information includes the work process, work intensity, interaction with the environment, and working hours. The work process includes actions, the work intensity includes static or continuous movement or intermittent movement, and the interaction with the environment includes the category of interaction; (2) Requirement analysis step: It is clear that the type of protective clothing is a single-piece liquid-tight chemical protective clothing and the protected part is the whole body. Select the standard GB 24539-2009 "Protective Clothing - General Technical Requirements for Chemical Protective Clothing" corresponding to the liquid-tight chemical protective clothing; clarify the requirements for the protective performance and wearing performance of the protective clothing fabric, and clarify the characteristics that the clothing style and structure should have, including being one-piece and having an opening in the front of the chest; clarify the requirements for the ergonomic performance of the clothing; (5) Finally, two core results of requirement analysis, namely the performance requirements of the protective clothing fabric and the requirements for the clothing style and structure, are formed.

[0035] (3) Solution and implementation step: After multiple "design - implementation - evaluation - optimization" cycles, a solution for the chemical protective clothing is finally obtained, and a chemical protective clothing that meets the requirements is obtained. The solution and implementation include fabric selection and development, and the design and production of the chemical protective clothing. The fabric selection and development include three methods: selecting existing fabrics, newly developing new fabrics, and partially developing new fabrics; the fabric selection iteration process of the chemical protective fabric starts with polyvinyl chloride fabric with a relatively high degree of matching with the requirements. The results show that this fabric has a high protection level but poor breathability and does not meet the requirements for the time being. Continue to iterate on the microporous membrane material, and the breathability level is improved, but the protective performance decreases accordingly and still does not meet the requirements. According to the feedback of the previous two results, iterate to the coated composite material, which meets the protective and thermo-hygroscopic comfort performance, but has poor durability and poor cooling performance, etc. On this basis, review material development is carried out. On the basis of meeting the basic protective performance and thermo-hygroscopic comfort, the defects in the previous stage are made up. Finally, it is feedback that the chemical protective clothing fabric selection is the sequential lamination of a heat-absorbing layer, a coating layer, a mesh layer, and a high-reflective layer. Conduct a level 1 objective test on the fabric, and all the required performances can be met. The cost is slightly high, but within an acceptable range. Therefore, the multi-layer composite fabric is determined as the chemical protective clothing fabric; conduct iterative design on the structure of the chemical protective clothing, and analyze the requirement to balance movement comfort and aesthetics while ensuring protective performance. The iterative optimization data includes the straight crotch length, the underarm bend amount, and the head circumference. The length, circumference, and looseness structure data that meet movement comfort and aesthetics are obtained, and a sample garment is made; (4)On-site testing and finalization steps: Test the protective performance, thermal and moisture comfort performance of the sample garment and the comparison samples. Conduct a Level 2 test on the sample garment, a Level 3 human test in a climate chamber, a Level 4 test in a restricted site, and a Level 5 on-site test. Compare the test data with the requirements until a liquid-tight chemical protective suit that meets the requirements is obtained.

[0036] The comparison sample 1 is a polymer film-coated fabric, and the comparison sample 2 is a rubber composite fabric. The verification results are as follows. The results show that the protective performance, thermal and moisture comfort, movement comfort, and aesthetic comfort of the chemical protective suit can meet the requirements, and the model has a certain scientificity and stability.

[0037] Evaluation items Liquid-tight spraying Penetration performance (level) Liquid pressure-resistant penetration (level) Thermal resistance (clo) Moisture resistance (m2·Pa / W) Core temperature Human subjective evaluation Index <3 times the standard contamination area Not less than 3 Not less than 1 —— —— 38.5 is the human limit value Extremely cold, cold, slightly cold, normal, slightly warm, warm, extremely warm Control sample 1 1.5 times 4 3 1.6 632 37.4 Normal Control sample 2 0.8 times 5 3 1.7 715 37.6 Slightly warm This chemical protective suit 0.9 times 4 2 1.2 248 37.4 Normal The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered by the protection scope of the present invention.

Claims

1. A protective clothing product frame, characterized in that: The framework consists of three levels: basic layer, supporting layer and application layer. The basic layer includes application environment and users. The application environment includes hazard factors and climatic conditions. The users include form and movement. The supporting layer includes engineering technology, material science, performance evaluation and clothing design. The application layer includes different types of protective clothing, including chemical protective clothing, bulletproof vests and firefighting clothing.

2. A development model for universal protective clothing based on an engineering perspective, including problem definition, requirements analysis, solutions and implementation, field testing and finalization.

3. According to the development model of a universal protective clothing based on an engineering perspective described in claim 2, the problem definition includes application environment information, user information, and work information. The application environment information includes harmful factors, climate conditions, space, and other factors. The harmful factors include the category of harmful factors, the form of harmful factors, and the degree of harm; the climate conditions include temperature range, humidity range, and airflow range; the space includes the size of the workspace, indoors or outdoors; the other factors include other environmental factors that may interact with the protective clothing, the user information includes gender, age, and body shape characteristics, the work information includes work process, work intensity, interaction with the environment, and work time, the work process includes actions, the work intensity includes static or continuous movement or intermittent movement, and the interaction with the environment includes interaction categories; The demand analysis includes: (1) clarifying the type, series or single piece of protective clothing, and the protective parts, and selecting the corresponding standards for protective clothing; (2) clarifying the protective performance and wearing performance requirements of the protective clothing fabric, and selecting the evaluation standards corresponding to the various performances of the fabric; (3) clarifying the characteristics that the clothing style and structure should have, including the treatment and requirements of split, one-piece or vest, and the opening parts; (4) clarifying the ergonomic performance requirements of the clothing, including mobility, thermal comfort, and the maximum working time of the protective clothing. The requirements are closely related to the ergonomic performance of the protective clothing; (5) ultimately forming the core results of the two demand analyses of protective clothing fabric performance requirements and clothing style and structure requirements; the solution and implementation are obtained through multiple cycles of "design-implementation-evaluation-optimization" to finally obtain a solution for the protective clothing and obtain protective clothing that meets the requirements; the solution and implementation include fabric Selection and development, design and production of protective clothing. The fabric selection and development includes three methods: selecting existing fabrics, developing new fabrics and partially developing new fabrics. First, according to the fabric performance requirements and standard requirements, the performance indicators of the fabrics are clarified, and a fabric performance indicator evaluation plan is formulated; then a fabric development plan is formulated, the main contents of which are the number of fabric layers, the performance requirements of each layer of fabric, the materials and the combination methods. At the same time, a detailed fabric selection or development process needs to be formulated, and a reasonable experimental plan needs to be designed; then, fabrics are selected or developed according to the formulated plan. After obtaining the fabrics, the fabric protection and wearing performance need to be evaluated according to the evaluation plan, with a focus on the overall protection and wearing performance of multi-layer fabrics. If the fabrics cannot meet the requirements, it is necessary to review the fabric performance indicators or modify the fabric development plan, and repeat the above process until fabrics that meet the requirements are obtained; The protective clothing design and production is based on the premise of ensuring safety, with the wearer as the center, focusing on the human body-protective clothing-environment, considering the mutual coordination of protective clothing and other protective equipment, and designing the structure and style of protective clothing from an overall perspective to obtain sample clothing. The protective clothing design and production includes first clarifying the performance indicators of protective clothing according to the performance and standard requirements of the clothing, and formulating a protective clothing performance indicator evaluation plan, including harmful liquid barrier performance test and human wearing test; then designing the structure and style of protective clothing according to the protection and ergonomic performance requirements. The key content that needs to be considered in the design is how the clothing can effectively protect the human body and how the human body can efficiently carry out the corresponding work after wearing the protective clothing; then making sample clothing, after the sample clothing is made, combined with the protective clothing performance evaluation plan, the protective clothing sample clothing is reasonably and scientifically evaluated for its protection and ergonomic performance. If the protective clothing sample clothing cannot achieve the protection or ergonomic performance, such as sports performance, it is necessary to review the protective clothing performance indicators or modify the clothing design plan, and repeat the sample clothing production and evaluation process until the design requirements are met; The field test mentioned above is also required before finalization. According to the 5-level evaluation system, the field test is a human wearing test, which is carried out in the order of limited field test and large-scale field test; The 5-level evaluation system is as follows: Level 1 and Level 2 are objective tests, Level 3 is a wearing test, and Level 4 and Level 5 are field tests. Level 1 is a fabric performance test, Level 2 is a clothing performance test, Level 3 is a climate chamber clothing human test, Level 4 is a restricted field test, and Level 5 is a field test.

4. A method for using a development model of a liquid-tight chemical protective clothing based on an engineering perspective, comprising: (1) Problem definition step: The problem definition includes application environment information, user information, and work information. The application environment information includes harmful factors, climate conditions, space, and other factors. The harmful factors include the category of harmful factors, the form of harmful factors, and the degree of harm. The climate conditions include temperature range, humidity range, and airflow range. The space includes the size of the workspace, indoor or outdoor. The other factors include other environmental factors that may interact with protective clothing. The user information includes gender, age, and body shape. The work information includes work process, work intensity, interaction with the environment, and working time. The work process includes movements. The work intensity includes static or continuous movement or intermittent movement. The interaction with the environment includes the interaction category. (2) Requirements analysis steps: clarify that the type of protective clothing is a single-piece liquid-tight chemical protective clothing, and the protection part is the whole body, and select the corresponding standards for liquid-tight chemical protective clothing; clarify the protective performance and wearing performance requirements of the protective clothing fabric, and clarify the characteristics that the clothing style and structure should have, including one-piece and chest opening; clarify the clothing ergonomic performance requirements; and finally form the core results of the requirements analysis of protective clothing fabric performance requirements and clothing style and structure requirements; (3) Solution and implementation steps: After multiple cycles of "design-implementation-evaluation-optimization", the solution for chemical protective clothing was finally obtained, and chemical protective clothing that met the requirements was obtained. The solution and implementation included fabric selection and development, chemical protective clothing design and production. The fabric selection and development included three methods: selecting existing fabrics, developing new fabrics, and partially developing new fabrics. The iterative process of fabric selection for chemical protective fabrics started with polyvinyl chloride fabrics that had a high degree of match with the requirements. The results showed that the fabric had a high protection level but poor air permeability and did not meet the requirements for the time being. The microporous membrane material was further iterated, and the air permeability level was improved, but the protection performance decreased accordingly, which still did not meet the requirements. Based on the feedback from the previous two results, the coating composite material was iterated to meet the protection and thermal and moisture comfort performance, but its durability and cooling performance were poor. On this basis, the material development was reviewed to make up for the defects in the previous stage while meeting the basic protective performance and thermal and hygroscopic comfort. The final feedback was that the chemical protective clothing fabric was selected as a heat-absorbing layer, a coating, a mesh layer, and a high-reflective layer in sequence. The fabric was subjected to a level 1 objective test, and the required performance was met. The cost was slightly higher, but within an acceptable range. Therefore, the multi-layer composite fabric was determined as the chemical protective clothing fabric; Iteratively design the structure of chemical protective clothing, and analyze the requirements to ensure both comfort and aesthetics while ensuring protective performance. Iteratively optimize data including straight crotch length, armpit bend, and hood circumference, and obtain length, circumference, and looseness structure data that meet comfort and aesthetics, and make samples; (4) On-site testing and finalization steps: Test the protective performance and thermal comfort performance of the sample clothing and the comparison sample, conduct a Level 2 test on the sample clothing, conduct a Level 3 test on the human body in a climate chamber, conduct a Level 4 test in a restricted field and a Level 5 field test, compare the test data with the requirements, until a liquid-tight chemical protective suit that meets the requirements is obtained.

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