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Related problems of plastic additives

Related problems of plastic additives

2022-04-26

1. Definition of lubricant and the difference between internal and external lubricants?

Lubricant - it can improve the friction and adhesion between the particles in each layer of plastic and between the melt and the metal surface of processing equipment, increase the fluidity of resin, regulate the plasticizing time of resin and maintain continuous production, which is called lubricant. Sainuo's lubricant polyethylene wax has good lubrication effect, takes into account the balance of internal and external lubrication, and has high cost performance.

The external lubricant can increase the lubricity of the plastic surface during processing, reduce the adhesion between the plastic and the metal surface, and minimize the mechanical shear force, so as to achieve the purpose of easy processing and molding without damaging the performance of the plastic. Internal lubricant can reduce the internal friction of polymer, increase the melting rate and melt deformation of plastic, reduce melt viscosity and improve plasticization performance.

Differences between internal and external lubricants: internal lubricants are required to have good compatibility with polymers, reduce friction between molecular chains and improve flow performance; The external lubricant requires certain compatibility with the polymer to reduce the friction between the polymer and the surface of processing machinery.

2. What is a coupling agent and what are its molecular structure characteristics?

Coupling agent is a kind of substance that can improve the interface characteristics between filler and polymer materials.

There are two functional groups in its molecular structure: one can react with polymer matrix or at least have good compatibility; The other can form chemical bond with inorganic filler.

Sainuo aluminate coupling agent has the functions of coupling, lubrication and dispersion, which makes the formula simpler and has good lubrication performance, which is conducive to enhancing the flow performance of materials or melts and reducing resistance. 

3. What is color masterbatch?

Answer: it is an aggregate made by uniformly attaching super constant pigments or dyes to the resin; Basic composition: pigment or dye, carrier, dispersant, additive; 

Functions: ① it is conducive to maintaining the chemical stability and color stability of pigments; ② Make pigments have better dispersibility in plastics; ③ Protect the health of operators; ④ Simple process and easy color conversion; ⑤ The environment is clean and does not contaminate the utensils; ⑥ Save time and raw materials.

4. What are polymer processing aids? What is its function? 

Additives are various auxiliary chemicals that need to be added in the production or processing of some materials and products to improve the production process and product performance. Various auxiliary chemicals are required in the process of processing resin and raw rubber into plastic and rubber products.?

Functions: ① improve the process performance of polymer, optimize processing conditions and submit processing efficiency; ② Improve the performance of products and improve their service value and service life.

5. What is the function of plasticizer?

Weaken the subvalent bond between polymer molecules, that is, van der Waals force, so as to increase the mobility of polymer molecular chain and reduce the crystallinity of polymer molecular chain.

6. What are the reasons for the unstable heating of PVC?

① The molecular chain structure contains initiator residues and allyl chloride plays the role of activating group, and the double bond of end group reduces the thermal stability;

② The effect of oxygen accelerates the removal of HCl during the thermal degradation of PVC;

③ HCl produced by the reaction can catalyze the degradation of PVC;

④ The amount of plasticizer.

7. Based on the current research results, what are the main functions of heat stabilizers?

① Absorb and neutralize HCl and inhibit its autocatalysis;

② Replace the unstable allyl chloride atom in PVC molecule to inhibit the removal of HCl;

③ The addition reaction with polyene structure destroys the formation of large conjugate system and reduces coloring;

④ Capture free radicals and prevent oxidation reaction;

⑤ Neutralize or passivate metal ions or other harmful substances that catalyze degradation;

⑥ It can protect, shield and weaken ultraviolet radiation.

8. Why is UV most damaging to polymers?

Ultraviolet waves are long and powerful, breaking most polymer chemical bonds.

9. What kind of synergistic system does intumescent flame retardant belong to, and what is its basic principle and function?

Intumescent flame retardant belongs to phosphorus nitrogen synergistic system.

Mechanism: when the polymer containing the flame retardant is heated, a uniform carbon foam layer can be formed on the surface to insulate heat, isolate oxygen, suppress smoke and prevent dripping, so it has good flame retardant performance.

10. According to the current research, what are the action mechanisms of flame retardants?

① The decomposition products of flame retardants at combustion temperature form a non-volatile and non oxidizing glass like film, which can isolate the reflected energy of air or have low thermal conductivity.

② The flame retardant is decomposed by heating to generate non combustible gas, so as to dilute the combustible gas and dilute the oxygen concentration in the combustion area;

③ Heat consumption of flame retardants due to dissolution and decomposition;

④ Flame retardant promotes the formation of a porous thermal insulation and carbon stabilizing layer on the plastic surface to prevent heat conduction and continuous combustion.

11. Why are plastics prone to static electricity during processing or use?

Because the molecular chains of the main polymer are almost composed of covalent bonds, they can neither ionize nor transfer electrons. In the process of its processing and use of products, when it wants to contact and rub with other objects or itself, it will be charged due to the gain and loss of electrons, and it is difficult to disappear through its own conduction.

12. What factors affect the strength of reinforced plastics?

① The strength of the reinforcing agent is selected to meet the requirements;

② The strength of basic polymers can be met through the selection and modification of polymers;

③ Surface adhesion of plasticizer and basic polymer;

④ Tissue material of reinforcing material.

13. What is foaming agent?

Foaming agent is a kind of material that can make rubber and plastic in liquid or plastic state in a certain viscosity range form microporous structure.

Physical foaming agent: a kind of compound that achieves the purpose of foaming by relying on the change of its own physical state in the foaming process.

Chemical foaming agent: it will be thermally decomposed at a certain temperature to produce one or more gases to make the polymer foam.

14. What does coloring power mean?

Is the ability of colorant to affect the color of the whole mixture with its own color; When colorants are used in plastic products, the meaning of hiding power refers to its ability to prevent light from penetrating the products/*

Qingdao Sainuo Chemical Co., Ltd. We are a manufacturer forPE wax, PP wax, OPE wax, EVA wax, PEMA, EBS,Zinc/Calcium Stearate…. Our products have passed the REACH, ROHS, PAHS, FDA testing. Sainuo rest assured wax, welcome your inquiry!

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