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Third, the application advantages of various modified plastics in the communication industry are prominent.
Most of the components such as notebook computer casings, bottom plates, and mobile phones use modified plastics
.
Such as ABS/carbon fiber, PA/carbon fiber, PP/carbon fiber, resin/silicon powder and other materials, these new high-strength plastic functional materials have gradually replaced metal materials
.

Fourth, with the increasing requirements of various power tools in terms of insulation, flame retardancy, and light weight, plastic modification can improve or improve their functions, so as to meet the application requirements of products
.

Fifth, modified plastics are more and more widely used in railway, military, medical, aerospace and other fields
.
Artificial organs, artificial bone joints and functional modified plastics with high temperature resistance, aging resistance and high strength have played a positive role in the rapid development of high technology
.

Sixth, bio-based plastic is a new type of biodegradable material, which is polymerized from fully degradable raw materials extracted from renewable plant resources.
After being discarded, it can be degraded and consumed in the natural environment, thereby reducing environmental pollution.
For green plastic
.
Bio-based plastics have very broad market development prospects in biomedicine, green medical equipment, automotive decoration, electronic appliances and disposable daily necessities
.
Bio-based plastics can improve the performance of materials, reduce production costs, and expand application fields through processing techniques such as modification, filling, and foaming
.
Researcher Zhu Jin from Ningbo Institute of Materials Science, Chinese Academy of Sciences has conducted in-depth research on the modification and application of polylactic acid
.

Development Status of Modified Plastics

1.
Modified filling

The main purpose of filling masterbatch is to reduce production cost.
Most of them are produced by using inorganic powder or industrial waste with low price and wide sources as filling material, and adding appropriate amount of additives and synthetic resin
.

Heavy calcium carbonate filling masterbatch is a widely used filling and modified material in the plastics industry.
The manufacturers are all over the country, with an annual output of more than 5 million tons
.

2.
Modified masterbatch

Modified masterbatch is a new modified material developed on the basis of filler masterbatch
.
Add glass fiber, talc, mica, wollastonite, barium sulfate, kaolin and other inorganic materials to the resin, or add synthetic resins or additives with special properties during processing, such as: anti-aging agent, antioxidant, anti-aging agent Fuels and other additives or POE, EVA, etc.
, these composite materials play the functional characteristics of different materials in application
.
Such as automobile bumpers, instrument panels, automobile interior decoration parts, etc.
, the use of PP talc powder has the advantages of improving impact strength, improving flexural modulus, reducing shrinkage, and reducing rigidity loss caused by vehicle impact
.

3.
Functional modification

Various materials such as graphene, silicone powder, rare earth, magnesium hydroxide, metal fine powder (silver, copper, zinc, etc.
) are added to the plastic, and the product index is improved through modification technology, and the flame retardancy, aging resistance, resistance Physical properties such as high and low temperature have been improved, and special properties such as electrical conductivity, antibacterial, insulation, and reinforcement can also be realized, and it has occupied a place in the main durable plastic product market
.

4.
Multi-component compound modification

Multi-component composite modification mainly combines plastics with one or more inorganic materials, polymer materials, chemical additives, etc.
through blending, grafting, block and other forms to make plastics "alloying".
The properties of each component complement each other to form a plastic material with multiple excellent properties, so as to achieve the purpose of improving performance and multi-functionality
.
After these material "alloys" are used in high-tech industries, they have the characteristics of light quality, high strength and excellent performance, and become new functional materials in aviation, aerospace, automobile, railway, mechanical parts, medical materials and so on
.

The main research direction of the School of Materials Science and Engineering of North Central University is the high performance and functionalization of plastics.
The successful nylon flame retardant composite material is modified by nylon/inorganic material/magnesium hydroxide, sodium antimonate and zinc borate.
The flame retardant performance reaches V-0 level, the environmental protection effect is obvious, and the heat resistance is improved.
It is used in electronic, electrical and military products
.

5.
Special modification

Different functional materials or additives are added to the special plastics, so that the expensive special plastics not only maintain the original characteristics, but also have special functions, which are suitable for the market application of various products
.

Such as high-performance resins such as polyphenylene sulfide (PPS), polyimide (PI), polyetheretherketone (PEEK), polysulfone (PSF) and liquid crystal polymer (LCP), adding carbon fiber, graphene, liquid crystal high performance resin Different materials such as molecules and rare earths have good electrical properties, high temperature resistance, dimensional stability and special flame retardancy, radiation resistance, chemical resistance and mechanical properties.
These modified new materials are used in electronic appliances, automobiles, home appliances, aviation, etc.
, petrochemical and cutting-edge science and technology fields such as rockets and aerospace have increasingly important application fields
.
The nylon/liquid crystal polymer and nylon/PC composite modified materials developed and mass-produced by Chongqing Keyiying New Materials Co.
, Ltd.
are used in automobiles and military industries, and have achieved satisfactory results
.

Development trend of modified plastics

1.
Nanoscale inorganic materials

Inorganic materials are widely used in plastics.
The functions of inorganic materials are gradually highlighted with the ultra-fine particle size.
Plastics modified with inorganic nano-powders have many unique properties, bringing new development opportunities to the development of the plastics industry.

.
Inorganic nanoparticles can endow plastics with new functions, improve the aging resistance and flame retardant effect of plastics, and improve the thermal change temperature and wear resistance
.

For example, the thermal deformation temperature of PA6 modified with 5% organic montmorillonite can be increased by 1.
5 times; the gas permeability of the material is greatly reduced after adding nanoclay to PET, which is 100 times smaller than the oxygen permeability of pure PET
.
The amount of inorganic nanoparticles added in the plastic is small, generally 3% to 5%.
Compared with the original resin, the density of the composite material is almost unchanged or has a small increase, and there is no disadvantage that other properties are reduced due to too much filler
.

2.
High-efficiency chemical additives

The development of new high-efficiency additives has become an important development direction for modified plastics.
The additives involved in modified plastics are in addition to those commonly used in plastic processing, such as heat stabilizers, plasticizers, UV absorbers, nucleating agents, antistatic agents, In addition to dispersants and flame retardants, high-efficiency and multi-effect functional additives such as toughening, flame retardant, synergistic, and alloy compatibility (interface compatibility) are also critical to modified plastics
.

Usually the type and quality of some additives play a key role in the performance and cost of modified plastics, especially when new toughening agents, flame retardant synergists, and alloy compatibilizers play a key role in the realization of high-performance engineering plastics and special The cost reduction of engineering plastics is of great significance
.

3.
Environmental protection of modified plastics 

With the enhancement of people's awareness of environmental protection and the increasingly strict environmental regulations, the concepts of environmental protection such as plastics' renewable utilization, environmental digestibility, biodegradability, non-toxicity, odorless, and pollution-free have been integrated into the design and manufacture of modified plastics In the process, attention should be paid to the conservation and rational utilization of energy resources, and the research and development of non-polluting, fully degradable, recyclable and environmentally friendly modified plastic products has become a new hotspot
.

Modified plastics are a fusion of different industries, and attention should be paid to the improvement and improvement of production technology, as well as the theoretical and practical research and promotion of multi-composite materials and various process technologies
.
Especially in the research and production application of green biological additives, the mass production of special functional materials (such as carbon fiber, liquid crystal polymer, graphene, etc.
), the selection of inorganic mineral powder, the application of nano-scale material dispersion and surface modification treatment, etc.
Process technology should attract the attention of the industry, enterprises and experts, and contribute to the green, environmentally friendly and low-carbon development of China's plastics industry
.

China's modified plastics industry is developing rapidly and the competition is fierce.
There are still shortcomings in technical research and product application research that cannot be ignored.
It is necessary to strengthen technical exchanges with the same industry abroad, increase cooperation with international famous enterprises, and speed up modification.
Plastics are developing towards high precision
.

Foreign plastic products attach importance to product durability, functionality and recyclability, while Chinese plastic products regard cost and price as the primary conditions, which not only affects the application effect, but also brings difficulties to the natural environment, especially in agricultural plastics, packaging Films and other aspects are particularly prominent, which has attracted great attention from the government and the industry
.

Recently, the Ministry of Industry and Information Technology issued the "Notice on Responding to the Novel Coronavirus Pneumonia to Help Small and Medium-sized Enterprises Resuming Work and Resuming Production and Overcoming Difficulties".
, public services and other policy measures to help the majority of small and medium-sized enterprises to strengthen their confidence and tide over the difficulties
.
Identify the QR code at the bottom right of the picture to view central and local supportive policies
.