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Low-temperature Impact Modifier Tensile Strength Is Large
May 15, 2017

low-temperature Impact Modifier Plastic toughness and rigidity are the opposite concept. There are two physical quantities of stiffness and flexibility in mechanics.

"Stiffness" refers to the size of the force required when the unit is deformed;

"Flexibility" refers to the size of the object in the unit under the deformation occurred.

low-temperature Impact Modifier It can be seen that the "stiffness" of the larger objects, the less prone to deformation (performance in the elongation is very small); "flexibility" the greater the object more prone to deformation (performance in the elongation).

low-temperature Impact Modifier An ideal state in which the stiffness of an object approaches infinity (or the extent to which the object is subjected to its deformation to a negligible degree), we call the object rigid. In the mechanical analysis, you can not consider its own deformation. Therefore, rigidity is a property that reflects the degree of deformation of an object.

low-temperature Impact Modifier Toughness of the material is relatively soft, physical properties of the tensile elongation at break, impact strength is greater; hardness, tensile strength and tensile modulus is relatively small.

While the rigid material of its hardness, tensile strength; breaking elongation and impact strength may be lower; tensile elastic modulus is greater. Bending strength The weight of the reaction material, the bending strength is large, the rigidity of the material is large, and vice versa. In the ASTM D790 bending performance standard test method, these test methods are suitable for rigid materials also suitable for semi-rigid materials. It is not suitable for tough materials, so the toughness of the elastomer is not to test the bending strength.

low-temperature Impact Modifier The toughness and rigidity above are relative to the mechanical properties of the test. There may be an accident. For example, with glass fiber reinforced plastic, its rigidity becomes larger, but may also be the possibility of increased tensile strength and impact strength. In the impact, vibration load, the material can absorb a large amount of energy to produce a certain deformation without damage to the nature known as toughness or impact toughness. Building steel (mild steel), wood, plastic, etc. is a typical toughness material. Pavement, bridges, crane beams and seismic requirements of the structure should consider the toughness of the material.

Rigidity and brittleness are generally linked together. Fragility means that when the external force reaches a certain limit, the material occurs without sudden loss of aura, and there is no obvious plastic deformation of the nature. The mechanical properties of brittle materials are characterized by a compressive strength greater than the tensile strength, and the ultimate strain at break is minimal. Brick, stone, ceramics, glass, concrete, cast iron, etc. are brittle materials. Compared with the tough materials,low-temperature Impact Modifier they are resistant to shock loads and bear the shock effect is quite unfavorable.

As engineering plastics, we hope it has both good toughness and rigidity. In improving the toughness of the material, should also try to improve the rigidity. Generally add the elastomer can increase the toughness, adding inorganic filler can increase the rigidity. The most effective way is to combine the toughening of the elastomer and the reinforcement of the filler.

low-temperature Impact Modifier Poor impact resistance is a performance defect for some important plastics in the industry. Such as PVC, PS, PP, etc., especially at low temperatures due to the impact resistance is too low and its application is limited. However, in thermoplastics, by adding "impact modifier" can greatly improve their impact resistance.

There are many varieties of impact modifiers, commonly used ACR-acrylic resin, MBS-methyl methacrylate-butadiene-styrene copolymer, CPE-chlorinated polyethylene, ABS, EVA, EPT-ternary Vinyl acetate and so on. From the perspective of the modification of plastic products, low-temperature Impact Modifier ACR is the best comprehensive performance category, MBS is an important impact of transparent products modified agent, in the global impact modifier market occupies an important position. Although the impact modifier can improve the impact strength, but the other mechanical strength has a negative impact. Such as MBS added to the PVC tensile strength and bending strength decreased. ACR addition, will also make HPVC-high molecular weight PVC tensile strength, hardness and Vicat heat resistance has declined. CPE addition, but also to the blend of tensile strength, bending strength, Vicat softening point down. So the use of impact modifier, you must take into account other performance, be taken into account. To determine the appropriate amount.


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