ASA resin is acrylic rubber body lipid the graft copolymer of styrene and acrylonitrile, compared with ABS, due to the introduction does not contain a double bond of acrylate rubber instead of butadiene rubber, and weather resistance with the improvement of nature, is about 10 times higher than ABS, and other mechanical properties, processability, similar to ABS, chemical corrosion resistance.
1. Texture of ASA resin
ASA resin is a two-phase structure composed of rubber phase and resin phase. The rubber phase is dispersed in the continuous resin phase in granular form to form an "island" structure. There are five layers of SAN grafts on the interface of the two phases.ASA resin is closely related to the two-phase structure. Continuous phase SAN resin plays a role in protecting the modulus, strength and glass transition temperature of the whole material.Dispersed-phase rubber can help disperse and absorb impact energy and improve toughness.Therefore, ASA resin greatly improved SAN toughness, but at the same time, its modulus and tensile strength
decreased little, and its heat resistance changed little.
2. Impact performance of ASA resin
The mechanism of rubber-enhanced SAN resin to improve impact strength is that due to the microplastic deformation of the resin, a stress concentration place is formed at the interface between SAN resin and rubber, resulting in "silver grain" to absorb impact energy.At the same time, due to the heat generated by the deformation of entropy of rubber, the relative Tg of the resin near the gum decreases, which promotes the generation of "silver grain".The lower Tg of colloidal phase in the resin is, the higher its impact strength will be. The acrylic rubber used in ASA resin has a higher Tg, but the modified acrylic rubber has a lower Tg and a higher impact strength.
3. Heat resistance of ASA resin
Generally, the thermal deformation temperature of ASA resin is only about 85 degrees. In order to broaden its application range,especially in the automotive industry, the heat resistance of ASA resin must be improved.At present, the methods to improve the heat resistance of ASA include: 1. Copolymerization of ASA with a third monomer, such as A-methylstyrene; 2.3. NPMI and other heat-resistant modifiers were added to modify;4. Add glass fiber and other inorganic materials.
4. Weather resistance of ASA resin
ASA resin has no double bond structure, which greatly improves its weather resistance, overcomes the shortcomings of ABS resin,such as the significant decrease in mechanical strength and the yellower color due to the decomposition of sunlight, etc.Since ASA
resin contains no carbon-carbon double bond, the dissociation energy of hydrogen on the main chain is 376KJ/mol, which is converted into a wavelength of less than 300nm. The image glue in ABS resin is believed to have a carbon-carbon double bond, and the dissociation energy of hydrogen at the double bond position is 163KJ/mol, which is converted into a wavelength of less than 700nm.It can be seen that only light waves with a wavelength of 300nm can have an aging effect on ASA, while the energy of solar energy is basically distributed above 290nm, so ASA resin has excellent weather resistance.
5. Other properties of ASA resin
ASA resin has excellent mechanical properties, good thermal stability and significant weather resistance. Compared with ABS, ASA resin has better chemical resistance and environmental stress cracking resistance.Widely used in outdoor decoration materials, automobiles, electronics, daily necessities and outdoor sports equipment and other fields.
Specification
|
Typical value at 23℃
|
Unit
|
Test standard
|
G8700
|
|
Properties
|
|
|
|
|
Symbol
|
-
|
-
|
ASA
|
|
Specific gravity
|
g/cm³
|
ISO 1183
|
1.15
|
|
Water absorption,24h
|
%
|
ISO 62
|
-
|
|
Saturated water absorption at 23℃
|
%
|
ISO 62
|
-
|
|
Processing
|
|
|
|
|
MFR melt volume flow rate
|
g/10min
|
ISO 1133
|
22
|
|
Melt volume temperature Range
|
℃
|
-
|
200-230
|
|
Mold temperature range
|
℃
|
-
|
-
|
|
Mechanical Properties
|
|
|
|
|
Tensile modules
|
Mpa
|
ISO5 527
|
2300
|
|
Tensile strength, yield
|
Mpa
|
ISO5 527
|
50
|
|
Tensile elongation, break
|
Mpa
|
ISO5 527
|
38
|
|
Breaking elongation
|
%
|
ISO5 527
|
25
|
|
Flexural strength, yield
|
Mpa
|
ISO5 178
|
70
|
|
Flexural modulus
|
Mpa
|
ISO5 178
|
2400
|
|
Izod impact strength, notched
|
KJ/m
|
ISO5 180
|
5
|
|
Thermal Properties
|
|
|
|
|
Vicat softening temperature
|
℃
|
ISO 306
|
79
|
|
HDT, 0.45 Mpa, 3.2mm,Unannealed
|
℃
|
ISO 75
|
-
|
|
HDT,1.82 Mpa, 3.2mm,Unannealed
|
℃
|
ISO 75
|
-
|
|
CTE,-40℃ to 40℃,flow
|
1/℃
|
ISO 11359
|
8.10E-05
|
|
CTE,-40℃ to 40℃,xflow
|
1/℃
|
ISO 11359
|
8.10E-05
|
|
Heat conductivity
|
W/(m.k)
|
ISO 8302
|
-
|
|
Heat index, electrical property
|
℃
|
UL 746B
|
-
|
|
Heat index, mechnical impact property
|
℃
|
UL 746B
|
-
|
|
Heat index, non mechnical impact property
|
℃
|
UL 746B
|
-
|
|
Electrical Properties
|
|
|
|
|
Dielectric factor at 1MHZ
|
-
|
IEC 60250
|
-
|
|
Dissipation factor at 1MHZ
|
-
|
IEC 60250
|
-
|
|
Volume resistivity
|
Ω.m
|
IEC 60250
|
-
|
|
CTI
|
-
|
IEC60250
|
-
|
|
Statement Declaration
|
|
|
|
|
These data should only be used as classical values. Unless expressly agreed in writing,can not be identified as the index or
guarantee value of the material. The properties of the product is affected to some extent by mold/machine head design, processing
conditions and coloring. Unless specified, all data are derived from tests performed on standard samples at room temperature.
|
