New developped PVC extrusion profile for power socket rail
others
Plastic water imbibition
by：CSSSLD
2021-01-23
Injection molding processing material blocking the ability of water molecules through, has called the moisture resistance.
When moisture resistance is dry food moisture-proof packaging design is an important parameter.
Moisture permeability coefficient of permeability is material and moisture transmission.
Moisture permeability coefficient is the standard condition, per unit time and unit vapor pressure difference, through unit thickness and area of steam.
Moisture transmission is standard condition, a certain thickness of thin films by the amount of water vapor within 24 h.
plastic suction process is actually internal penetration and diffusion of water molecules to the polymer process. Bibulous rate is largely depends on the size of the basic types and molecular composition of materials. Contains only hydrogen and carbon materials, such as PE, PS is very water resistant, and contains hydrogen, nitrogen, or OH groups of material is very easy to water absorption. Nylon is a typical example of plastic water imbibition. All kinds of nylon water imbibition is proportional to the size and its nitrogen content.
to modification of absorbent material, improves the water imbibition. Such as nylon can blending with polyolefin alloy, thus effectively improved. Due to changes in humidity affects the performance of the plastic, so with relative humidity 50% as a plastic sample state adjustment and test of standard humidity, as the basis of a comparison of all kinds of plastic performance. Permeability refers to the water in the air molecules adsorbed on the surface of solid materials, and inside the solid material to penetration and the spread of a kind of ability. Adsorption, infiltration, diffusion, through, is a continuous process.
molecules containing chlorine, bromine, fluorine plastic has the waterproof, such as PTFE water proofing property is good material. Compared with thermoplastics, thermosetting plastic usually has higher water imbibition. According to the material is easy to determine polymer polarity to the water absorption ability. Water is a polar material, so easy to absorbing water, polar polymer nonpolar polymer is more resistant to water. Adding additive components, such as inorganic filler, glass fiber and plasticizer, will change the plastic water imbibition, because these additives present a greater affinity for water. In addition, the close degree is one of the factors affecting the molecular chain.
the environment temperature has influence to the water, some plastic suction volume is small at room temperature, at high temperatures may absorb more moisture. Plastic material after absorbing water, have effects on the performance of the two aspects of physical change and chemical change. Physical changes include influence the appearance of the material, surface performance and size change caused by swelling, as well as the mechanical properties such as stiffness and strength is reduced, but the impact toughness will increase. In addition, the optical performance, especially the electrical have considerable influence.
the nature of the plastic material impregnated in water absorb water as absorbent. Similarly, the same mechanism, characterization of another term of the same behavior is hygroscopic. Hygroscopic generally refers to solid material absorption properties of the moisture in the air. Absorbent material injection tooling for parts design using in water environment, an indicator is very important. Absorbent material is bibulous rate is to say, he is under a certain temperature, materials within the prescribed period of time, absorb the moisture after the additional weight percentage. Plastic bibulous rate is in commonly 0. 06% - 3. Within 0%.
is the feature of a physical change, when the moisture absorption equilibrium, the change of mechanical properties, generally not to continue, another is that change is a reversible process, the absorption of moisture was removed after drying, mechanical properties were restored. Chemical change is mainly refers to containing ester base or amide group a class of polymer structure, can be in the water under the action of hydrolysis, especially at high temperature, such as polycarbonate, thermoplastic polyester, polyester polyurethane, etc.
more wonderful articles, plastic index, click directly.
http://www。 csssld。 cn//html/2017/Info_0126/475。 HTML
nantong on suye's official website: http://www. csssld。 cn//
plastic suction process is actually internal penetration and diffusion of water molecules to the polymer process. Bibulous rate is largely depends on the size of the basic types and molecular composition of materials. Contains only hydrogen and carbon materials, such as PE, PS is very water resistant, and contains hydrogen, nitrogen, or OH groups of material is very easy to water absorption. Nylon is a typical example of plastic water imbibition. All kinds of nylon water imbibition is proportional to the size and its nitrogen content.
to modification of absorbent material, improves the water imbibition. Such as nylon can blending with polyolefin alloy, thus effectively improved. Due to changes in humidity affects the performance of the plastic, so with relative humidity 50% as a plastic sample state adjustment and test of standard humidity, as the basis of a comparison of all kinds of plastic performance. Permeability refers to the water in the air molecules adsorbed on the surface of solid materials, and inside the solid material to penetration and the spread of a kind of ability. Adsorption, infiltration, diffusion, through, is a continuous process.
molecules containing chlorine, bromine, fluorine plastic has the waterproof, such as PTFE water proofing property is good material. Compared with thermoplastics, thermosetting plastic usually has higher water imbibition. According to the material is easy to determine polymer polarity to the water absorption ability. Water is a polar material, so easy to absorbing water, polar polymer nonpolar polymer is more resistant to water. Adding additive components, such as inorganic filler, glass fiber and plasticizer, will change the plastic water imbibition, because these additives present a greater affinity for water. In addition, the close degree is one of the factors affecting the molecular chain.
the environment temperature has influence to the water, some plastic suction volume is small at room temperature, at high temperatures may absorb more moisture. Plastic material after absorbing water, have effects on the performance of the two aspects of physical change and chemical change. Physical changes include influence the appearance of the material, surface performance and size change caused by swelling, as well as the mechanical properties such as stiffness and strength is reduced, but the impact toughness will increase. In addition, the optical performance, especially the electrical have considerable influence.
the nature of the plastic material impregnated in water absorb water as absorbent. Similarly, the same mechanism, characterization of another term of the same behavior is hygroscopic. Hygroscopic generally refers to solid material absorption properties of the moisture in the air. Absorbent material injection tooling for parts design using in water environment, an indicator is very important. Absorbent material is bibulous rate is to say, he is under a certain temperature, materials within the prescribed period of time, absorb the moisture after the additional weight percentage. Plastic bibulous rate is in commonly 0. 06% - 3. Within 0%.
is the feature of a physical change, when the moisture absorption equilibrium, the change of mechanical properties, generally not to continue, another is that change is a reversible process, the absorption of moisture was removed after drying, mechanical properties were restored. Chemical change is mainly refers to containing ester base or amide group a class of polymer structure, can be in the water under the action of hydrolysis, especially at high temperature, such as polycarbonate, thermoplastic polyester, polyester polyurethane, etc.
more wonderful articles, plastic index, click directly.
http://www。 csssld。 cn//html/2017/Info_0126/475。 HTML
nantong on suye's official website: http://www. csssld。 cn//
Custom message
Related Products
