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Effect of Electron Beam I Irradiation on Breaking Strength of Medical Disposable Protective Clothing Material

Feb. 23, 2021

Abstract: Disinfection or sterilization is an important part of the production process of medical disposable protective clothing (referred to as medical protective clothing). Compared with ethylene oxide sterilization method, irradiation is faster and more efficient.


Since medical protective clothing has strict requirements in terms of protection performance,the radiation effect of its materials has important research significance. The electron beam accelerator was used to treat three kinds of medical protective clothing materials polypropylene (PP), polyester fiber (PET) and Tyvek with different absorbed doses. Then the samples were subjected to aging tests for different time. The main performance indicators related to radiation effect in GB 19082-2009 were tested. Test results show that the performances of the three kinds of medical protective gown such as resistance to water penetration, resistance to synthetic blood penetration, and filtration efficiency are not significantly affected when absorbed dose is below 50 kGy. How ever, the breaking strengths of PP and Tyvek materials protective coveralls are greatly affected. Two-factor analysis of variance was used to study the significance of the effects of radiation and aging on the breaking strengths of the three kinds of medical protection clothes materials.

Results show that the absorbed dose and the aging time after irradiation have different effects on the breaking strength of the three protective clothing materials. Among them, the absorbed dose has the most significant radiation effect on the breaking strength of PP protective clothes. It proves that improving the initial breaking strength of PP protective gown can make its performance meet the standard after irradiation.


Radiation processing technology is a physical effect, chemical effect, and biological effects generated by nuclear radiation and substance interaction.

The product is processed to reach the scheduled goal. The irradiation techniques are mainly used in disinfection, food preservation, material modification. Irradiation sterilization is a process work of microorganisms to kill microorganisms with γ-rays and X-rays below 5 meV or 10 MEV. The principle is a gamma ray, electron beam or X-ray produced by the radiation source to microorganisms, directly or indirectly destroy microbial ribonucleic acid, protein, and enzyme to kill microorganisms to sterilize. This method is one of the most advantageous sterilization methods in the international, irradiated sterilization method has the advantages of rapid and efficient, energy-saving and environmentally friendly, no harm, sealing processing, controllable, continuous and efficient, normal temperature.


The irradiation technology has also been widely used in textile technology, such as processing or modifying materials by irradiation crosslinking, polymerization, grafting, degradation, etc. More traditional processing methods, electron beam irradiation techniques short, less time consumption, high efficiency, greatly improve the benefits of textile enterprises. In the early days of the new crown epidemic, the number of medical protection suites in AnHui Province is up to 100,000 sets. In 2019, chinese national standard medical care service was only 400,000. The demand for epidemic exploding is a major test for the production and processing capacity of medical protective clothing. Sterilization is an important part of medical protective clothes production. The traditional ethylene oxide fumigation sterilization method also needs to prepare 7 to 14 days of toxic harmful residue under certain conditions. Therefore, the ethylene oxide disinfection sterilization cannot meet the urgency requirements of new championships, and the sterilization is a key bottleneck that limits the supply of medical protection clothes. The number of industrial electronic accelerator irradiation devices to deal with medical protective coveralls can reach 5 to 100,000, and the fast and efficient advantages are obvious. Therefore, only irradiation techniques can solve the urgent urgent in an emergency at the time.


New crown epidemic epidemic prevention medical protective clothing fabric is multi-spun bonding, water thorn, SMS composite nonwoven fabric and adhesive film products. The materials used in the market in the market are mainly polypropylene (PP). Polyester fiber (PET), DuPont, developed by special processes. Tyvek developed by Polyethylene (PE).


Due to the γ-ray, X-rays, electron beams, the ionization effect can be generated by the chemical bonds such as the polymer, affecting material properties. Therefore, medical protective gown is not only to achieve disinfection effect, but also considering the effects of irradiation on their materials. The new crown epidemic medical protective coveralls mainly uses ethylene oxide sterilization, and systematic study on the irradiation effect of medical protection clothing is almost blank. Therefore, related content research is carried out, and the application of irradiation techniques is of great significance in medical protective clothes sterilization. This paper studies the PP. PET. Tyvek materials for different manufacturers, the medical disposable protective gown, using high energy electron beams for gradient absorbing dose irradiation, and accelerates aging, and then detects and analyzes.


1 test process and results

1.1 test process

After different absorbed dose irradiation, 5 corresponding samples were tested, and 120 medical protective clothing samples per material were sampled, 360 samples were 360 samples. Deleting the test results in each set of samples greater than 2 times the abnormal value of the standard deviation, and the average value is the final result.

1) In terms of liquid barrier performance, PP and PET material medical protective gown sample anti-seepage water pressure ≥10 kPa, Tyvek's 4 kPa or more, all meet GB 19082--2009 requirements; no significant change in irradiation before and after irradiation . Three samples antheloided blood penetration indicators are ≥7kpa, namely 4 levels, no significant changes in the irradiation, irradiation absorption dose and aging time factors are small.

2) The above three materials medical protective clothes filtration efficiency is ≥90%. There is no significant change in the irradiation before and after irradiation, so irradiation absorption dose and aging time factors have little effect.

3) Sample microorganism indicators after irradiation treatment of absorbent doses greater than sterilization dose.

4) As the amount of irradiation absorbed dose, the breakage of PP and TYVEK material medical protective clothing has different degrees of decrease, and PET has no significant change, and the aging time has less affected.


2.2 Fracture strength test results

The higher the non woven fabric, the better the quality, the more excellent strength. Follow the standard GB / T 2923. 1 Error analysis of breakage strength measurements. According to the recommendation, the test error is trimmed to 5n when the average value of 1000 N, the average value 1000n and or more is repaired by calculating 95% confidence interval (average number 0), and the average value is <1000 N.


The longitudinal breakage strength of 90 to 100 N, the lateral breakage strength of about 50 to 100 N, and the lateral breakage force is ≥45 n in the lateral breakage of 50 N (the requirements of the gb 19082--2009). As the absorbed dose increases, longitudinal and lateral breakage Strongly declined, after absorbing the dose of more than 20 kgy, PP material medical protective clothing transverse breakage is <45 N, which does not meet the standard requirements. Within the absorbent dose and aging time in the test, the medical protective clothing in PET material is almost unaffected. The vertical and transverse breakage strong is much greater than the standard requirements of 45 n.Tyvek material medical protective clothing longitudinal and lateral fault strength with the absorbent dose. The increase in the gradual decline, but the decline is lower than the PP material. Within the absorption dose and aging time of the trial, its longitudinal and lateral breaking strength meet the standard requirements.


3 results analysis

3.1 Material irradiation modification effect

The mechanical properties after the irradiation of polymer materials are mainly influenced by the two reactions of radiation cracking and irradiation crosslinking, and the irradiation cleavage is simultaneously transmitted, and one of them dominates. When the irradiation crosslinks occupies, the polymer molecules finally form three dimensions. Network structures, called irradiation cross-linking polymers; when radiation degradation is dominated, the polymer molecular weight is significantly reduced, called it. Type polymer. Two reaction processes transmitted and degraded during irradiation are randomly present, and are affected by absorbent dose, absorption dose rate, temperature and irradiation.


Since the PP material medical protective coverall is very sensitive to the absorbent dose, the elongation and breakage of breakage should be significantly decreased when the absorbed dose increases. The research used PP material medical protective cloth samples were largely decreased by 20 kGy absorbed dose irradiation, and it was finally desirable to meet the requirements of GB19082-2009.


For PET, since the conjugate structure of the benzene ring can be dispersed in the main chain, the radiation energy can be dispersed, rather than concentrated on a key, so the radiation resistance of PET material containing a benzene ring is better. For polymer materials, aging is mainly a process of degradation, with the increase of aging time, product structure and physicochemical properties vary from degrees. The breakage of the medical protective clothing of the above three materials is slowly declining with aging time.


In the experiment, it was found that the mechanical properties of some test materials were not regularly reduced in accordance with the increase of the absorption dose. When the PP material medical protective gowns not aging and the absorbed dose is 30 kgy or less, the longitudinal breakage has a small change in the longitudinal breakage, and 30 kGy will have a significant decrease in tendency. The perpetratilation of PET and TYVEK materials is slightly rising in 20 kGy, and the overall of the breakage of the breakage is small. Preliminary analysis, irradiation crosslinking in lower absorption doses is the main effect, and irradiation degradation in higher absorbing doses is also dominated.


After 10KGY absorbed dose irradiation, PP material medical protective clothing may generate crosslinking effect under high temperature aging conditions, and the role will gradually release with the incident after the irradiation, and the irradiation degradation is exceeded at a certain time. Aging degradation. Introducing this is the reason for the 3 months of PP material medical protection clothing samples. It has no reduction in aging for 1 month without reducing, and the extension of the aging time is gradually declined.


4 small knot

The results show that the selection of three material medical protective clothing is anti-seepage. Anti-blood penetration. Filtration efficiency. Microbial indicators are met. However, the breakage of break is affected to varying degrees, in which PP material medical protective clothing is the largest, and after 20 kgy absorbed dose irradiation, the breakage has not met the national standard strong requirements. The following recommendations were proposed for medical protective jewelry and sterilization process based on the analysis of the experiment.


1) Medical protective gown products of PP materials should be confirmed to confirm the transverse breakage strength initial indicators before batch irradiation. Generally, the medical protective equipment sterilized dose of PP material is between 20 and 30 kgy, in order to ensure that it is not less than 45 N after the 30 kgy absorbed dose irradiation, the initial lateral breakage is greater than 60n. At the same time Strictly control the level of biological load and minimize the absorbed dose as much as possible in the premise of satisfying the sterilization effect. Effective irradiation sterilization of PP material medical protective clothing products can be achieved by the above manner.


2) PET material medical protective cloth is excellent in resistance, the future should focus on PP material protective clothing in the future

Three-resistance performance improvement. In particular, in particular the improvement of its break.


3) Compared with traditional ethylene oxide sterilization, irradiation techniques are rapid and efficient, and the advantages of energy conservation and environmental protection are obvious. However, it is necessary to reduce the irradiation of medical protective coveralls by lifting the technology level of the irradiation device to reduce the irradiation of medical protective clothing.


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