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Abstract: China is one of the world's leading production bases for consumer electronics, and the damage caused by static electricity to electronic components and integrated circuits in electronic products is destructive or even devastating. With the increasing demand for consumer electronic products and the shortening of the life cycle of consumer electronic products, the application of antistatic nonwoven packaging materials in the packaging of electronic products will be greatly developed.
Keywords: antistatic; electronic products; packaging; non-woven fabric
First, the market situation of electronic products in China
China is one of the most important production bases of consumer electronic products in the world. Since the 1990s, China has attracted a large number of consumer electronics by virtue of its good manufacturing industry supporting resources and strong manufacturing cost advantages. Multinational companies and well-known brands in product manufacturing have successively laid out production in China. Under the background of China's growing economic strength and steady increase in per capita consumption, the demand for consumer electronic products is increasing, and the life cycle of consumer electronic products is shortening. The market share of electronic products will be very huge. The electronics manufacturing industry will also have great development.
Second, the packaging of electronic products needs antistatic
With the rapid development of science and technology, the high efficiency of production and the improvement of automation, the high integration of electronic components makes the electrostatic hazard generated during the production and use of products more and more serious. The damage that static electricity can cause to electronic components and integrated circuits in electronic products is destructive or even devastating.
Let us first understand what is static electricity: static electricity is not static electricity, it is electricity that temporarily stays somewhere in the macro. When a person stands on a carpet or sofa, the human body voltage can be as high as 10,000 volts, while the static electricity in the rubber and plastic film industry can reach more than 100,000 volts. Matter is made up of molecules, molecules are made up of atoms, and atoms are made up of negatively charged electrons and positively charged protons. Under normal conditions, the number of protons of an atom is the same as the number of electrons, positive and negative, so it shows an uncharged phenomenon. However, the electrons surround the nucleus, and they are out of orbit after an external force, leaving the original atom A and invading other atoms B. The A atom has a positive phenomenon due to the reduction of the number of electrons, which is called a cation; the B atom is increased by the number of electrons. Negative with electricity, called anion. The reason for the imbalance of electron distribution is that the electrons are out of orbit by external forces. This external force contains various energies such as kinetic energy, potential energy, thermal energy, and chemical energy.
In the electronic product transportation process will produce a variety of friction and collision, the electronic components of the electronic product will be electrostatically charged by frictional charging, or contact with objects with static electricity to discharge. High-voltage static electricity can break through integrated circuits and precision electronic components, causing complete damage to electronic components, or aging components, reducing component life, and ultimately completely damaging.
To deal with static electricity, we can take preventive measures to prevent static electricity by preventing frictional electrification, reducing the contact between electronic products and insulating materials, and making all surfaces equipotential. By using an antistatic packaging material with conductivity, the electronic product is in an equipotential state, thereby avoiding the generation of static electricity of the electronic product.
Third, the application of non-woven textiles in electronic product packaging
Antistatic electronic product packaging materials generally include: polyethylene plastic film materials and polypropylene PP nonwoven materials. The general polyethylene plastic film material takes 300 years to degrade, and the environmentally friendly degradable polyethylene plastic film material needs 2-3 years of degradation, while the polypropylene PP nonwoven material only needs to be degraded in 90 days outdoors. In today's increasingly environmentally conscious, environmentally friendly nonwovens have been accepted and promoted by many advanced countries as packaging for electronic products.
Kellie Solution released a new survey on the application of nonwovens in the packaging sector. The nonwovens market for packaging has achieved a combined annual growth rate (CAGR) of over 8.3% over the past 10 years, exceeding the general nonwovens and packaging markets. Although the packaging nonwovens now account for only about 2.5% of all applications in nonwovens, this value will increase significantly in the near future. The report assesses the end use and value chain of nonwovens in the packaging market. And forecasted in 2015. Showcasing a world of packaging markets for more than $50 billion a year for nonwovens manufacturers.
The raw material for the production of non-woven fabrics such as spunbond, spunlace and SMS is polypropylene (PP). Since polypropylene (PP) is a non-polar structure, the crystallinity is high, the molecular arrangement is regular, the structure is dense, and the untreated The nonwoven fabric has a contact angle of 148° and has a certain water repellency, so that static electricity is easily generated during rubbing. In order to prevent static electricity from damaging electronic components in electronic products, the generated static charge should be quickly leaked. The ability of a nonwoven material to leak static charge is related to the hydrophilicity and specific resistance of the nonwoven material. A nonwoven material which reaches a specific resistance level of 1010 Ω·cm or less under standard conditions (relative humidity 65%, 20 ° C) is generally referred to as an antistatic nonwoven material.
Generally, the specific resistance of the non-woven fabric material is more than 1013 Ω·cm, and it is necessary to perform antistatic finishing on the non-woven fabric material, and the non-woven fabric material is obtained by the moisture-absorbing modification method by using a hydrophilic antistatic finishing agent. Antistatic levels can be applied to the packaging of electronic products.
4. Antistatic moisture absorbing modification of nonwoven fabric
The antistatic anti-moisture modification method of the non-woven fabric has a chemical modification method and a physical modification method, and now the physical modification method is used more, and the physical modification method has a blend modification method and a post-finishing modification method.
1. Blending modification method is to mix other hydrophilic polymers or surfactants with polypropylene (PP) particles of raw materials for producing non-woven fabric, so that the hydrophilic polymer is filled into the larger spherulites of PP, so that Non-woven fabric with antistatic moisture absorption properties.
Blending modification methods can be divided into:
(1) Masterbatch method, the hydrophilic polymer is made into a hydrophilic master batch, and then mixed with the raw material polypropylene (PP) pellets for producing the nonwoven fabric, and then melt-spun together.
(2) In the whole granulation method, a hydrophilic polymer is mixed with polypropylene (PP), and extruded by a screw extruder to obtain hydrophilic polypropylene (PP) particles, which are then melt-spun.
(3) Pre-spinning injection method, the hydrophilic polymer is injected into a screw extruder, and mixed with a polypropylene (PP) melt.
The disadvantage of the mixing method is that the hydrophilic polymer and the polypropylene (PP) sometimes mix unevenly, and it is easy to block the spinneret, resulting in maintenance and replacement of the spinneret. In addition, it can cause spinnability problems, and silk and drip, a very small slurry drop, can cause the antistatic moisture absorption performance of the entire nonwoven fabric to fail, and is not easy to find, causing quality problems.
2. After finishing, the ordinary non-woven fabric is sizing, and the ordinary non-woven fabric is provided with a hydrophilic active antistatic finishing agent and an auxiliary agent, and then dried to make the finishing liquid and the auxiliary agent fixed on the non-woven fabric. The surface, the continuous hydrophilic group allows the contact angle of the nonwoven fabric to be close to zero, forming a continuous conductive path, so that the ordinary non-woven fabric can be provided with antistatic moisture absorption performance.
Nonwoven sizing is available in three forms: spray, Kissroll add-on rolls and foaming. The spray type is low in cost and takes up a small position, but the effect of sizing is not so good, especially when one or two nozzles are broken, it is impossible to detect, resulting in uneven sizing. The Kissroll filling roller is sizing and foaming, and the sizing effect is good, but the equipment is expensive and takes up a large position. The drying equipment is an oven. According to different hydrophilic antistatic moisture absorption finishing process requirements, a certain drying temperature and a certain drying time are required. The oven needs to be able to adjust the temperature, and the drying time is produced by the production line and the oven. The length of the medium non-woven fabric is determined. The airflow in the oven should be uniform, and the airflow in many inferior or self-made ovens is disordered, which is easy to cause deformation during the drying process of the nonwoven fabric. The good oven has a device for distributing the airflow, so that the drying of the nonwoven fabric achieves the desired effect. And energy saving.
Antistatic nonwoven materials can be widely used in the packaging materials of electronic products such as computers, communications, instrumentation, electronic components and integrated circuits. The application of antistatic nonwoven packaging materials in the packaging of electronic products will be very Great development.
Author information:
Name: Huang Chenxi, concurrently: vice moderator of Alibaba Textile Forum
Unit: Guangzhou Shengpeng Textile Industry Special Equipment Co., Ltd.
Address: No. 2, Third Industrial Zone, Dayongkou Village, Shawan Town, Panyu District, Guangzhou, Guangdong, China
Mobile phone TEL: 86-20-34876872 34833083 FAX: 86-20-34876821
E-mail: Zip code: 511483
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