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Your Position:Home > News> Industry news > A summary of the modified knowledge necessary for plastics.
A summary of the modified knowledge necessary for plastics.
Source: http://www.huazongsj.com Release time: 2017-12-22
What sex is modification?
On the basis of the general plastics and engineering plastics, by physical, chemical, machinery, after filling, blending, and enhance processing method, improves the performance of the plastic or increase the function of the plastic flame retardancy, strength, impact resistance, toughness and other mechanical performance is improved and improve, so that you can apply plastic in special environment, such as electric, magnetic, optical, thermal conditions.
The application scope of the modified technology.
From the production of raw material resins to various specifications and varieties of modified plastic masterbatch, it is widely used in the raw materials and molding process of almost all plastic products.
Such as appearance, transparency, density and precision of the plastic, workability, mechanical properties, chemical properties, magnetic properties, corrosion resistance, aging resistance, wear resistance, hardness, thermal properties, flame retardancy, barrier property, etc.
In order to reduce the cost of plastic products, improve performance and improve function, plastic modification technology is indispensable.

Commonly used modification methods.

1. Filling modification
By adding inorganic mineral (organic) powder to ordinary plastics, it can improve the rigidity, hardness and heat resistance of plastic materials.
There are many types of fillers and their characteristics are complex.
The effect of plastic filler: improve the plastic processing performance, improve the physicochemical property, increase the volume and reduce the cost.

Requirements for plastic additives:

(1) the chemical property is inert, inert, and does not have adverse reactions with the resin and other additives;
(2) it does not affect water resistance, chemical resistance, weather resistance and heat resistance of plastics;
(3) do not reduce the physical properties of plastics;
(4) can be filled in large quantities;
(5) small relative density and little influence on the density of products;
(6) the price is relatively low.

2. Enhanced modification
Enhancement: through the addition of glass fiber, carbon fiber and other fibrous materials.
Enhancement effect: it can obviously improve the rigidity, strength, hardness and heat resistance of the material.
Adverse effects of modification: but a lot of materials can lead to poor surface and elongation at break.

Enhancement principle:

(1) the reinforced materials have higher strength and modulus;
(2) resin has many inherent good physics, chemistry (corrosion resistance, insulation, irradiation, instantaneous high temperature ablation, etc.) and processing performance;
(3) after the composite resin and reinforced material, reinforced material can rise to improve mechanics or other performance of the resin, the resin of reinforced material can have the effect of bonding and load, the reinforced plastics with excellent performance.

3. Toughening modification
There are many materials that are not flexible enough and too brittle. They can increase the toughness and low temperature performance of materials by adding materials with good toughness or ultra-fine inorganic materials.
Toughening agent: in order to reduce the brittleness of plastic, increase its impact strength and elongation and add an additive in resin.

Commonly used toughening agents - mostly maleic anhydride graft compatibilizer:
Ethylene - vinyl acetate copolymer (EVA)
Polyolefin elastomer (POE)
Chlorinated polyethylene (CPE)
Acrylonitrile-butadiene-styrene copolymer (ABS)
Styrene-butadiene thermoplastic elasticity (SBS)
EPDM (EPDM)

4. Flame retardant modification
In many industries, such as electronic appliances and automobiles, the material has flame retardancy, but many plastic materials have low flame retardancy.
Increased flame retardancy can be achieved by adding flame retardant.
Flame retardant: it is also called refractory, fire retardant or fire retardant, which gives the flammability of flammable polymer functional auxiliaries.
Most of them are in the periodic table first Ⅴ (p), A Ⅶ A (bromine, chlorine) and Ⅲ A elements of compounds, antimony, aluminium).
Have smoke suppression effect of molybdenum compounds, tin compounds and iron and so on also belong to the category of flame retardants, mainly suitable for the demand of flame retardant plastic, delay or prevent plastic especially plastic polymer combustion.
Make it ignite time increase, ignite self-extinguishing, difficult to ignite.

Plastic flame retardant grade:
From HB, V-2, V-1, V- 0,5 VB to 5VA.

5. Resistance modification
Generally refers to the plastic under the low temperature cold resistant ability, due to the low temperature brittleness, inherent plastic to make plastic brittle at low temperatures, and thus for many plastic products used in low temperature environment, general requirements of its cold resistance.
Weather resistance: refers to the plastic products by sunlight, temperature change, drench the influence of the external conditions such as the wind blows, and the fading, discoloration, cracks, pulverization and strength decline and a series of aging phenomenon.
Ultraviolet radiation is a key factor in the aging of plastics.
6. Modified alloy

Plastic alloy is to use physical blending or chemical grafting method, copolymerization, the preparation of two or more materials into a high performance, functional, specialty a kind of new material, to improve the properties of a material or the purpose of both two kinds of material properties.
It can improve or improve the performance of existing plastics and reduce costs.
General plastic alloy: such as PVC, PE, PP, PS alloy is widely used, production technology has been widely held.
Engineering plastics alloy: blend of general engineering plastics (resin), mainly including to PC, PBT, PA, POM (POM), PPO, such as PTFE (polytetrafluoroethylene) engineering plastics as the main body of the blending system, and ABS resin modified materials.
The output of PC/ABS alloy is growing at about 10% a year, and its growth rate is in the forefront of the plastic field.
At present, the research on PC/ABS alloying has become a hot topic in polymer alloys.
Main categories of modified plastics.
1 flame retardant resin
Flame retardant plastic products can greatly reduce the risk of fire when short circuit, overload, flooding, etc.
Strengthen the toughening resin class.
It is mainly divided into the special materials for resistance and toughening PP, and glass fiber reinforced thermoplastics.
Toughening PP special material (1) weather resistance, weather resistance toughening PP special material is a new material of polypropylene with engineering plastic properties, has good low temperature toughness, molding shrinkage of small, the advantages of high rigidity, good weathering resistance, mainly used for outdoor environment to climate, uv resistant.
Its main consumer groups are home appliance enterprises, auto parts enterprises and so on.
(2) glass fiber reinforced thermoplastics: the products mainly include glass fiber reinforced AS/ABS, glass fiber reinforced PP, glass fiber reinforced nylon, glass fiber reinforced PBT/PET, glass fiber reinforced PC, glass fiber reinforced PPE/PPS, etc.
Its main consumer groups include computer parts enterprises, machinery parts enterprises, electric tools enterprises, lamps and lanterns enterprises.
3 plastic alloy
It is mainly divided into PC alloy, PVC alloy and polyester alloy.
Characteristics of PC alloy products: high impact strength, creep resistance, heat resistance, low water absorption rate, non-toxic and excellent dielectric properties.
PC alloy application: automotive instrument panel, computer and office automation equipment, electric tool housing, cellular telephone, etc.
PVC/ABS alloy: it is made of PVC and ABS, adding toughening agent, lubricant, stabilizer, flame retardant and other modifier.

Performance advantages: excellent mechanical properties, weathering ability, processing rheological properties, good surface gloss, injection molding and extrusion effect, is a kind of alloy material with excellent performance.
Application scope: it can be used as an alternative to flame retardant ABS, PC, etc., which can be used in home appliance shell, electric switch, meter shell, lamp decoration material, communication network, building materials, etc.
: polyester alloy with excellent mechanical properties (fatigue) resistance, dimensional stability, resistance to chemical reagent, the ability of resistance to environmental stress cracking, scope of application: automobile, household appliances, electric tools, etc.

4 functional color masterclass

It mainly refers to the high impact polystyrene toughened flame retardant color masterbatch.
The feature of functional color master-can both reduce production cost and improve product quality.
(1) meet the flame retardant requirements of UL94, IEC-65 and GB8898, etc.
(2) improve the toughness, processing fluidity and demodulation of HIPS resin;
(3) give HIPS resin color.
In the field of materials in the forefront.
At present, the research on PC/ABS alloying has become a hot topic in polymer alloys.

Key words: 华纵塑机,清洁机批发,塑料造粒机生产厂家