CN110494028A - A kind of preparation method of the human body electromagnetic shielding protection patch for touch-screen mobile phone - Google Patents
A kind of preparation method of the human body electromagnetic shielding protection patch for touch-screen mobile phone Download PDFInfo
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Abstract
一种用于触屏手机的人体电磁屏蔽保护贴片的制备方法，涉及材料与工程科学技术领域，其特征在于：包括以下步骤：将耐老化的高分子材料结合剂、电磁屏蔽主吸波材料石墨以及金属或者金属氧化物粉体搅拌混合，形成主要功能原料；通过冷热加工工艺将功能原料加工成薄片；采用绝缘材料对薄片进行封装；按照手机型号安装面板接口。本发明采用电磁屏蔽材料与高分子材料混合成型，并作为夹层结构置于触屏手机面板后方，专用于屏蔽手机电路板上过高的电磁辐射对使用者脑部的直接伤害；同时，选用的材料具有吸波特性而非金属的反射特性，因此显著削弱电磁辐射对手机用户本身的伤害，而且对于周边人群也不会产生反射增强的电磁辐射。A method for preparing a human body electromagnetic shielding protection patch for a touch-screen mobile phone, which relates to the field of materials and engineering science and technology, and is characterized in that it includes the following steps: combining an aging-resistant polymer material binder and an electromagnetic shielding main wave-absorbing material Graphite and metal or metal oxide powder are stirred and mixed to form the main functional raw materials; the functional raw materials are processed into thin slices through cold and hot processing; the thin slices are packaged with insulating materials; the panel interface is installed according to the mobile phone model. The present invention adopts electromagnetic shielding material and polymer material to be mixed and molded, and is placed behind the panel of the touch screen mobile phone as a sandwich structure, and is specially used to shield the direct damage of the user's brain from the excessive electromagnetic radiation on the circuit board of the mobile phone; at the same time, the selected The material has wave-absorbing properties rather than metal-reflecting properties, so it significantly weakens the damage of electromagnetic radiation to mobile phone users themselves, and it will not produce electromagnetic radiation with enhanced reflection for surrounding people.
Description
技术领域technical field
本发明涉及材料与工程科学技术领域，特别涉及一种用于触屏手机的人体电磁屏蔽保护贴片的制备方法。The invention relates to the field of material and engineering science and technology, in particular to a preparation method of a human body electromagnetic shielding protection patch for a touch-screen mobile phone.
背景技术Background technique
早在上世纪七十年代，联合国人类环境会议已经将电磁辐射列为国际环境保护重点项目之一，定为必须抑制的公害。世界卫生组织(WHO，World Health Organization)把电磁辐射列为继水、气、声之后的第四大污染，并且列出电磁辐射对人体的五大影响：As early as the 1970s, the United Nations Conference on the Human Environment has listed electromagnetic radiation as one of the key projects of international environmental protection, as a public hazard that must be suppressed. The World Health Organization (WHO, World Health Organization) ranks electromagnetic radiation as the fourth largest pollution after water, air, and sound, and lists five major effects of electromagnetic radiation on the human body:
（1）电磁辐射是心血管病、糖尿病、癌突变的主要诱因之一；(1) Electromagnetic radiation is one of the main causes of cardiovascular disease, diabetes and cancer mutation;
（2）电磁辐射对人体生殖系统、神经系统、免疫系统可造成伤害；(2) Electromagnetic radiation can cause damage to the human reproductive system, nervous system, and immune system;
（3）电磁辐射是孕妇流产、不育、畸胎等病变的诱发因素之一；(3) Electromagnetic radiation is one of the predisposing factors for miscarriage, infertility, and teratogenic diseases in pregnant women;
（4）电磁辐射可直接影响儿童的发育、骨髓发育、导致视力下降、视网膜脱落，肝脏造血功能下降；(4) Electromagnetic radiation can directly affect children's development and bone marrow development, leading to vision loss, retinal detachment, and decreased liver hematopoietic function;
（5）电磁辐射可使女性内分泌紊乱、月经失调。(5) Electromagnetic radiation can cause endocrine disorders and menstrual disorders in women.
1975年就有专家指出，城市经济发展和人口增长使得电子、通信、汽车、计算机等设备大量进入家庭，城市中人为电磁能量年增长达7%-14%。按照该增长比率，2000年左右城市环境中的电磁能量密度已超过1975年的25倍，而2025年左右即可达1975年的700倍，由此可见，21世纪后城市的电磁环境将更加复杂与恶化。针对生活环境内电磁辐射的日益增强，采取必要的防护措施已经成为一种刚性越发增大的需求，防辐射材料在原材料市场上的地位也将越发突出。In 1975, some experts pointed out that urban economic development and population growth have brought a large number of electronic, communication, automobile, computer and other equipment into households, and the annual growth of man-made electromagnetic energy in cities has reached 7%-14%. According to this growth rate, the electromagnetic energy density in the urban environment has exceeded 25 times that of 1975 around 2000, and it will reach 700 times that of 1975 around 2025. It can be seen that the electromagnetic environment of cities after the 21st century will be more complex with deterioration. In response to the increasing electromagnetic radiation in the living environment, it has become an increasingly rigid demand to take necessary protective measures, and the position of radiation-proof materials in the raw material market will also become more prominent.
仅以通信行业为例。2008年1月，全国手机用户总量已达5.56亿户，较之1999年的4329万户，国内手机用户数在8年时间内增量多达5亿。美国权威预测机构StrategyAnalysis的数据显示，2001年底全球移动电话用户达到9亿人。到2010年全球移动电话用户总数不少于20亿。为了保证通信网络的覆盖率，满足客户对通话质量的要求，大量的移动通信基站在此期间建成并运转，覆盖了城区、郊县乃至偏远的乡村。这些基站的建设完善了无线信号的覆盖，为社会提供了优质而高效的通信服务，但由此带来的电磁辐射问题也日渐突出，人们在获得经济效益和生活上的方便之外，也被动地承受技术进步带来的负效应——电磁污染。Just take the communications industry as an example. In January 2008, the total number of mobile phone users nationwide reached 556 million, compared with 43.29 million in 1999, and the number of domestic mobile phone users increased by as much as 500 million within 8 years. According to data from Strategy Analysis, an authoritative forecasting agency in the United States, by the end of 2001, the number of mobile phone users in the world reached 900 million. By 2010, the total number of mobile phone users in the world will not be less than 2 billion. In order to ensure the coverage of the communication network and meet the customer's requirements for call quality, a large number of mobile communication base stations were built and operated during this period, covering urban areas, suburban counties and even remote villages. The construction of these base stations has improved the coverage of wireless signals and provided high-quality and efficient communication services for the society. However, the problem of electromagnetic radiation has become increasingly prominent. In addition to obtaining economic benefits and convenience in life, people are also passive. To bear the negative effects brought about by technological progress - electromagnetic pollution.
从污染源头看，移动通信基站的电磁辐射主要来自三方面，一是发射机的电磁泄露，二是发射天线的信号辐射，三是高频电缆及其接头处的电磁泄漏。从污染的方式看，电讯业的电磁污染分为两种情况，一种是移动通信设备在近距离上对个人的辐射伤害；另一种是大量通信基站形成的网络所造成的群体性辐射伤害。From the perspective of pollution sources, the electromagnetic radiation of mobile communication base stations mainly comes from three aspects, one is the electromagnetic leakage of the transmitter, the other is the signal radiation of the transmitting antenna, and the third is the electromagnetic leakage of high-frequency cables and their joints. From the perspective of pollution methods, electromagnetic pollution in the telecommunications industry can be divided into two situations, one is radiation damage caused by mobile communication equipment to individuals at close range; the other is group radiation damage caused by a network formed by a large number of communication base stations .
一般认为，使用移动电话时天线很贴近人的头部，因此其电磁辐射直接可作用于人的头部。当人体吸收的微波信号功率超过一定限值时，会对神经系统、血液和免疫系统等产生不良影响。操冬梅研究了移动电话电磁辐射对小白鼠生殖功能的损伤。结果表明，功率密度为1400μW/cm2的电话辐射可引起白鼠精子活动率下降、LDH-X活性降低以及精子尾部线粒体的超微结构改变，提示一定强度的电话辐射可能影响雄性生殖功能，其机制可能是通过非热效应作用于线粒体、阻碍生精细胞的能量代谢而产生生殖毒性。韩磊通过仿真计算研究了移动通信基站和手机终端产生的电磁辐射对人体的影响。结果表明，移动通信中的基站系统，由于其距离一般人群较远，在现有的卫生安全标准下，可认为它所引起的电磁辐射对多数人体无危害，但是手机对头部的辐射影响是相对明显的。参照通用ANSI /IEEEC95.1-1992国际安全标准，在手机工作频率900MHz、峰值发射功率2W、距离头部1cm的条件下，头部组织中的峰值SAR指标存在超标，但整个头部的平均SAR指标未超标（见表1所示）。It is generally believed that when using a mobile phone, the antenna is very close to the head of the person, so its electromagnetic radiation can directly affect the head of the person. When the microwave signal power absorbed by the human body exceeds a certain limit, it will have adverse effects on the nervous system, blood and immune system. Cao Dongmei studied the damage of electromagnetic radiation from mobile phones to the reproductive function of mice. The results showed that the telephone radiation with a power density of 1400 μW/cm2 could cause a decrease in sperm motility, LDH-X activity, and ultrastructural changes in the mitochondria of sperm tails in white mice, suggesting that a certain intensity of telephone radiation may affect male reproductive function, and the mechanism may be It acts on mitochondria through non-thermal effect and hinders the energy metabolism of germ cells to produce reproductive toxicity. Han Lei studied the influence of electromagnetic radiation generated by mobile communication base stations and mobile phone terminals on the human body through simulation calculations. The results show that the base station system in mobile communication, because it is far away from the general population, under the existing health and safety standards, it can be considered that the electromagnetic radiation caused by it is not harmful to most human bodies, but the radiation impact of mobile phones on the head is relatively obvious. Referring to the general ANSI/IEEEC95.1-1992 international safety standard, under the conditions of mobile phone operating frequency 900MHz, peak transmit power 2W, and 1cm distance from the head, the peak SAR index in the head tissue exceeds the standard, but the average SAR of the whole head The indicators did not exceed the standard (see Table 1).
比吸收率SAR（Specific Absorption Rate）：单位质量生物组织吸收的电磁功率，该量现已被各国研究工作者普遍认可和接受。ANSI/IEEEC95.1- 1992安全标准：以1克组织为测量单位，人体暴露于RF辐射（3KHz至300GHz）下的安全标准为：“对于公众场合下的照射，在任意连续30分钟内，人体全身平均SAR应小于0.08W/Kg，任意1克肌体中最大SAR应小于1.6W/Kg。”Specific Absorption Rate SAR (Specific Absorption Rate): The electromagnetic power absorbed by biological tissue per unit mass, which has been generally recognized and accepted by researchers from all over the world. ANSI/IEEEC95.1-1992 safety standard: Taking 1 gram of tissue as the measurement unit, the safety standard for human exposure to RF radiation (3KHz to 300GHz) is: "For exposure in public places, within any continuous 30 minutes, the human body The average SAR of the whole body should be less than 0.08W/Kg, and the maximum SAR in any 1 gram of body should be less than 1.6W/Kg."
通信基站的电磁辐射是目前的研究热点之一，国内有关文献也比较丰富。蔡梅园通过实测和仿真研究表明，建筑内部的钢筋阵对低频段的屏蔽效果很好，尤其是当波长远大于钢筋阵周期时。但是，随着电磁辐射频率的增大,建筑钢筋阵的屏蔽效果也会变差,透过率增加，并且当钢筋方向与入射波电场方向正交时会失去屏蔽作用。因此，要提高墙的屏蔽效果就必须增加墙的电导率。王强等人的研究也表明，大功率基站因高大建筑物及树木等屏蔽作用，在其电磁污染区内（50~300 m）射频电磁场的实际监测值也比较小，最大监测值为3.15 μW/cm2，由此提出基站-人群安全距离为30米。王淑娟通过研究提出的安全距离为40米。姜维国等人对GSM（Global System of Mobile communication）移动通信基站电磁辐射污染做了抽样分析，结果表明，大多数基站仅可达到国家电磁辐射环境影响标准GB8702-1988的要求，在设备正常运行情况下可认为不会对周围环境造成电磁辐射污染，但是GSM移动通信基站对50m内的建筑物影响仍然比较显著。Electromagnetic radiation of communication base stations is one of the current research hotspots, and domestic related literature is relatively abundant. Cai Meiyuan has shown through actual measurement and simulation research that the steel bar array inside the building has a good shielding effect on low-frequency bands, especially when the wavelength is much longer than the steel bar array period. However, as the frequency of electromagnetic radiation increases, the shielding effect of the building reinforcement array will also deteriorate, and the transmittance will increase, and the shielding effect will be lost when the direction of the reinforcement is perpendicular to the direction of the incident electric field. Therefore, to improve the shielding effect of the wall, the conductivity of the wall must be increased. The research by Wang Qiang and others also shows that due to the shielding effect of tall buildings and trees, the actual monitoring value of the radio frequency electromagnetic field in the electromagnetic pollution area (50~300 m) of the high-power base station is also relatively small, and the maximum monitoring value is 3.15 μW/ cm2, so the safe distance between the base station and the crowd is proposed to be 30 meters. Wang Shujuan proposed a safety distance of 40 meters through research. Jiang Weiguo and others conducted a sampling analysis of the electromagnetic radiation pollution of GSM (Global System of Mobile communication) mobile communication base stations, and the results showed that most base stations can only meet the requirements of the national electromagnetic radiation environmental impact standard GB8702-1988. It can be considered that it will not cause electromagnetic radiation pollution to the surrounding environment, but the impact of GSM mobile communication base stations on buildings within 50m is still significant.
由此不难看出，通信行业存在电磁辐射污染已经得到普遍认同。随着人们对通信质量的要求不断提高，通信设施乃至终端造成的辐射强度还在逐渐增大。虽然技术进步可以使单个设备辐射强度逐渐减小，但是随着设备种类的增多和设备分布密度增大，受害个体总辐射剂量是否按照期望逐渐减小尚属未知。因此，开发电磁屏蔽技术和材料解决人身伤害问题已经是共识，消费需求也迅速增长。It is not difficult to see from this that the existence of electromagnetic radiation pollution in the communication industry has been generally recognized. With the continuous improvement of people's requirements for communication quality, the radiation intensity caused by communication facilities and even terminals is still increasing gradually. Although technological progress can gradually reduce the radiation intensity of a single device, it is still unknown whether the total radiation dose of the victim will gradually decrease as expected with the increase in the types of devices and the increase in the distribution density of devices. Therefore, it has become a consensus to develop electromagnetic shielding technology and materials to solve personal injury problems, and consumer demand is also growing rapidly.
目前见诸报到的电磁屏蔽原材料，主要还是石墨粉体。此外还可以匹配相应的金属、金属氧化物等其他粉体。对于成形用的粘结剂，则因使用条件的差异而不同。当结构强度要求较高时，可采用树脂类高分子材料；对于加工性有较高要求时，可采用塑料或者橡胶等。At present, the electromagnetic shielding raw materials that are reported are mainly graphite powder. In addition, it can also match other powders such as corresponding metals and metal oxides. As for the binder used for forming, it is different due to the difference in use conditions. When the structural strength is required to be high, resin polymer materials can be used; when there is a high requirement for processability, plastic or rubber can be used.
有鉴于此，本发明提供一种用于触屏手机的人体电磁屏蔽保护贴片的制备方法。In view of this, the present invention provides a preparation method of a human body electromagnetic shielding protection patch for a touch screen mobile phone.
发明内容Contents of the invention
本发明的目的是提供一种用于触屏手机的人体电磁屏蔽保护贴片的制备方法，其应用可以显著削弱电磁辐射对手机用户本身的伤害，而且对于周边人群也不会产生反射增强的电磁辐射。The purpose of the present invention is to provide a method for preparing a human body electromagnetic shielding protection patch for a touch-screen mobile phone. Its application can significantly weaken the damage of electromagnetic radiation to the mobile phone user itself, and will not produce electromagnetic radiation with enhanced reflection to the surrounding crowd. radiation.
本发明为解决上述技术问题所采用的技术方案是：The technical scheme that the present invention adopts for solving the problems of the technologies described above is:
一种用于触屏手机的人体电磁屏蔽保护贴片的制备方法，其特征在于：包括以下步骤：A method for preparing a human body electromagnetic shielding protection patch for a touch-screen mobile phone, characterized in that it comprises the following steps:
（1）将耐老化的高分子材料结合剂、电磁屏蔽主吸波材料石墨以及金属或者金属氧化物粉体搅拌混合，其中，石墨与金属或者金属氧化物的比例为15-30:1形成混料；(1) Stir and mix the aging-resistant polymer material binder, graphite as the main absorbing material for electromagnetic shielding, and metal or metal oxide powder. The ratio of graphite to metal or metal oxide is 15-30:1 to form a mixture. material;
（2）通过冷热加工工艺将混料加工成功能薄片；(2) Process the mixture into functional flakes through cold and hot processing;
（3）采用绝缘材料对功能薄片进行封装；(3) Encapsulate the functional sheet with insulating material;
（4）按照手机型号安装面板接口。(4) Install the panel interface according to the mobile phone model.
优选地，结合剂为聚丙烯或者水玻璃。Preferably, the binder is polypropylene or water glass.
优选地，聚丙烯或者水玻璃含量为总质量的5-8%。Preferably, the content of polypropylene or water glass is 5-8% of the total mass.
优选地，金属为铁、镍、钴粉体。Preferably, the metal is iron, nickel, cobalt powder.
优选地，金属氧化物为氧化铁粉体。Preferably, the metal oxide is iron oxide powder.
优选地，功能薄片厚度为0.5-2mm。Preferably, the thickness of the functional sheet is 0.5-2mm.
优选地，通过注射成型工艺将混料加工成指定规格的功能薄片。Preferably, the mixture is processed into functional sheets of specified specifications by injection molding process.
优选地，先将混料加工成薄片，然后通过冲裁工艺将薄片加工成指定规格的功能薄片。Preferably, the mixed material is firstly processed into thin sheets, and then the thin sheets are processed into functional sheets of specified specifications through a punching process.
优选地，封装用绝缘材料为热塑性合成树脂。Preferably, the insulating material for packaging is thermoplastic synthetic resin.
由于采用了上述技术方案，与现有技术相比，本发明的有益效果是：Owing to adopting above-mentioned technical scheme, compared with prior art, the beneficial effect of the present invention is:
采用电磁屏蔽材料与高分子材料混合成型，并作为夹层结构置于触屏手机面板后方，专用于屏蔽手机电路板上过高的电磁辐射对使用者脑部的直接伤害；同时，选用的材料具有吸波特性而非金属的反射特性，因此显著削弱电磁辐射对手机用户本身的伤害，而且对于周边人群也不会产生反射增强的电磁辐射。总结以上技术特色不难发现本项目的创新之处：The electromagnetic shielding material and polymer material are mixed and formed, and placed behind the panel of the touch screen mobile phone as a sandwich structure, which is specially used to shield the direct damage of the user's brain from the excessive electromagnetic radiation on the circuit board of the mobile phone; at the same time, the selected material has The wave-absorbing characteristics are not the reflective characteristics of metals, so the damage of electromagnetic radiation to mobile phone users is significantly weakened, and electromagnetic radiation with enhanced reflection will not be generated for surrounding people. Summarizing the above technical features, it is not difficult to find the innovation of this project:
（1）把常见低成本电磁屏蔽材料石墨粉体等与高分子材料结合，开发出新的电磁屏蔽功能材料；(1) Combining common low-cost electromagnetic shielding materials such as graphite powder with polymer materials to develop new electromagnetic shielding functional materials;
（2）低原料成本、高加工效率、加工性良好，上述特点也为本技术创造了良好应用前景；(2) Low raw material cost, high processing efficiency, and good processability, the above characteristics also create a good application prospect for this technology;
（3）采用的工业化加工原料具有绿色环保特性；(3) The raw materials used for industrial processing are green and environmentally friendly;
（4）通过制作贴片应用于触屏手机，可以显著减少手机使用中电磁辐射对人脑部的伤害。(4) By making patches and applying them to touch-screen mobile phones, it can significantly reduce the damage of electromagnetic radiation to the human brain during the use of mobile phones.
具体实施方式Detailed ways
以下结合较佳实施例，对依据本发明提出的一种用于触屏手机的人体电磁屏蔽保护贴片的制备方法的具体实施方式及其效果，详细说明如后。The specific implementation and effect of the preparation method of a human body electromagnetic shielding protection patch for touch screen mobile phones according to the present invention will be described in detail below in conjunction with preferred embodiments.
实施例1Example 1
一种用于触屏手机的人体电磁屏蔽保护贴片的制备方法，其特征在于：包括以下步骤：A method for preparing a human body electromagnetic shielding protection patch for a touch-screen mobile phone, characterized in that it comprises the following steps:
（1）将耐老化的高分子材料结合剂聚丙烯、电磁屏蔽主吸波材料石墨以及铁粉体搅拌混合；其中，石墨与铁粉的比例为20：1；聚丙烯含量为总质量的8%，并充分混合，形成混料；(1) Stir and mix aging-resistant polymer material binder polypropylene, electromagnetic shielding main absorbing material graphite, and iron powder; among them, the ratio of graphite to iron powder is 20:1; the content of polypropylene is 8% of the total mass %, and fully mixed to form a mixture;
（2）通过注射成型工艺直接加工成1mm厚的功能薄片；(2) Directly processed into functional sheets with a thickness of 1mm by injection molding process;
（3）采用热塑性合成树脂聚氯乙烯对功能薄片进行封装；(3) Encapsulate the functional sheet with thermoplastic synthetic resin polyvinyl chloride;
（4）按照手机型号安装面板接口。(4) Install the panel interface according to the mobile phone model.
铁粉具有导电特性且加工性能较好，可用于电磁屏蔽。Iron powder has conductive properties and good processing performance, and can be used for electromagnetic shielding.
实施例2Example 2
与实施例1不同的是加工功能薄片的工艺，本实施例先将混料加工成1mm厚的薄片，然后通过冲裁工艺将薄片加工成指定规格的功能薄片。The difference from Example 1 is the process of processing the functional sheet. In this embodiment, the mixed material is first processed into a 1mm thick sheet, and then the sheet is processed into a functional sheet of a specified specification through a punching process.
实施例3Example 3
与实施例1不同的是，将铁粉替换为氧化铁粉体。The difference from Example 1 is that iron powder is replaced by iron oxide powder.
实施例4Example 4
与实施例1不同的是，将聚丙烯替换为水玻璃。Different from Example 1, polypropylene is replaced by water glass.
以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，任何未脱离本发明技术方案内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明技术方案的范围内。The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Any simple modification, Equivalent changes and modifications still fall within the scope of the technical solution of the present invention.
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