the mutual solubility of the mixed resin and plastic processing aid in

 Auxiliary plasticizer; inserted only partially crystalline molecular plasticizer amorphous regions of the polymer, the plasticizer, the plasticizer is also called non-solvent. Compatibility: the ability to dissolve the plasticizer and resin mixed with each other, and is one of the most basic requirements of plasticizer. Cohesive energy density (CED): energy per unit volume of solvent evaporation. Solubility parameters: the square root of the value of the energy of vaporization per unit volume of solvent. Cloud point (Tc): dilute homogeneous polymer solution and a plasticizer, at a temperature becomes cloudy during cooling. By measuring the cloud point can be estimated plasticizer and resin compatibility. The lower the cloud point, a plasticizer compatible with the polymer, the better. Plasticizing efficiency; plasticizing efficiency of the resin reaches a certain degree of softness is called the amount of plasticizer plasticizer. Plasticizing efficiency is a relative value, the plasticizer can be used to compare the plasticizing effect. The method used for representing plasticizing efficiency glass transition temperature (Tg) and reduce the decrease in modulus is represented. Oxidation of the polymer is the time increases with the decrease of the performance of the polymer, also known as auto-oxidation. Into the induction period, a strong oxidizing period. Antioxidants; refers to polymers by oxidation and slow the aging phenomenon can play the role of a class of chemicals. Primary antioxidant; antioxidant is considered to be the main cleaning agent, a free radical, it is through the coupling reaction (i.e., the termination reaction) to give a hydrogen atom or to prevent the damaging effects of free radicals in the polymer. Secondary antioxidants; role of antioxidants is to help decompose the peroxide oxidation of the resulting polymer. Antioxidants including an aid phosphite 2, 3 thioether antioxidants, metal deactivators metal ion deactivators; preventing the heavy metal ion induced oxidation of the resulting polymer material, often referred to as metal ions blunt agent or a metal deactivator, a metal chelating agent, also known as copper inhibitors. Stabilizer: to prevent or retard the polymer during processing, storage and use of chemical aging deterioration. Thermal stabilizers; mainly for PVC and other chlorine-containing polymers, which will not affect the processing and application, but also a certain degree of thermal decomposition of delaying the action of a class of additives. Light stabilizers; Where can inhibit or slow down the aging of optical oxygen substance called ultraviolet light stabilizer or stabilizers. Radical scavengers: a class of piperidine derivatives light stabilizer with steric effects, referred to as hindered amine WSD zinc stearate  light stabilizer (HALS) - aging or photoaging: molecular material long-term or short-term exposure to the sun set under strong fluorescence, due to absorption of UV energy, causing auto-oxidation reaction, leading to degradation of the polymer, making the products discoloration, brittleness, performance degradation, which can not be reused. This process is called oxidative aging or photoaging light flame retardants; able to increase the flame resistance of the material substance called flame retardants. They are mostly first periodic table V, compound VII and combustion speed of the group III element: refers to the length of the sample per unit time of combustion. Synergistic effect: refers to two or more with the use of additives, the total effect is greater than the sum of the individual effects when used alone. Synergy system: complex flame retardant with the use of the interaction between the flame-retardant to improve performance, the system is called a synergistic effect. Synergistic systems commonly antimony - halogen system, phosphorus halide system, phosphorus - nitrogen system. Burning speed: denotes the length of the sample per unit time of WSD Aluminum hydroxide  combustion. Burning speed is horizontal and vertical burning combustion method to measure too. Oxygen index: refers to the sample continued to burn like a candle shape, nitrogen - oxygen mixed gas stream must minimum oxygen content. External friction: polymer materials during the molding process, the polymer melt friction between the surface and processing equipment. Friction: polymer material during the molding process, the molten polymer molecules exist between friction. Lubricants; polymer to reduce friction and external friction, improved melt flow plastics, polymer material during processing to prevent the sticking of the device to ensure the surface smoothness of the added substance called lubricant. Lubricants: prior to processing the plastic ingredients, add a certain compatibility with the polymer lubricant and uniformly dispersed into the material, can reduce the friction between the resin molecules sky lubrication. External lubrication in two ways: one is in the polymer material forming the lubricant coated on the surface processing apparatus, allowed to melt at processing temperatures, and the metal surface of a "thin layer" is formed, the plastic melt and processing equipment to isolate, without adhering to the equipment, or ease of stripping off the roll; Another is compatible with the polymer is very small, it is easy to migrate from inside the polymer during processing On the surface, thereby forming WSD Calcium stearate  a spacer layer material, before the processing of the ingredients added to the plastic dispersion, and migration to the surface during processing, providing lubrication. Mold release agent: Mold and machining the workpiece remain completely chemically inert substance called a release agent. Blowing agents; make a class of blowing agents are liquid or plastic state within a certain viscosity range of rubber, plastic material forming the microporous structure.

Field of PVC processing aid applications overview of some of the development

Plasticizer addition, other competitors to enter the market to make additives become more enthusiastic. " Plasticizer market WSD one pack stabilizer  is very active in recent years ." Renewable energy technologies have significant market interest , as an alternative to traditional petroleum-based plasticizer raw materials. Benzoate, phthalate plasticizers. Reportedly showed that a plasticizer having a low viscosity compared to traditional , conventional defects can be eliminated to improve the  WSD PVC plasticizer efficiency of the production process and also as a heat stabilizer and a stabilizer formulation to reduce demand .
Other PVC additives company also announced this year , and some claim that " green" ( or at least the plant ) . By chemical modification of soybean oil -based wax. The company claims that when the injection molding, its performance is superior to the fatty acid -based lubricant , stronger liquidity and dimensional stability. When used in the manufacture of rigid PVC is particularly suitable , especially cadmium or WSD Polyethylene wax  zinc extrusion steady stable PVC or tin.
Earlier this year, for the production of calendered or extruded sheet and profiles . Especially those who need to print , composite , or a combination . Pick some plant materials ( non-animal ) as is said to provide the same optical performance and handling characteristics as a standard lubricant .

Types of additives and introduction

Sweeteners - commonly used artificial sweetener saccharin sodium,

sodium cyclamate. The purpose is to increase the sweetness sensation.
Preservatives - are commonly used sodium benzoate, potassium sorbate,

sulfur dioxide and lactic acid. For jams, preserves and other food

processing.
Spice - synthetic fragrances, but  WSD Metallic stearate also natural, flavor a lot. Consumers

eat chocolate all tastes, widely used in the production process of

various spices, it has a variety of unique flavors.
Coloring agents - commonly used synthetic pigment has carmine,

amaranth, lemon yellow, indigo and so on. It can change the appearance

of the food, it increased appetite.
Thickeners and stabilizers - can improve or stabilize the physical

properties of cold food, make food look smooth and delicate. They make

ice cream and other frozen food long-term organizational structure

soft, loose.
Nutritional supplements - can enhance and supplement certain

nutritional content of food. Such additives are a variety of vitamins,

amino acids, inorganic salts, etc., can make food food nutrition

fortifier meet different consumer needs. Such as various infant formula

to contain a variety of nutrition  WSD Plastic impact modifier enhancer, so milk to ensure the needs

of children of different ages on a variety of nutrition.
Antioxidants - can extend shelf life of food. Commonly used dimensions

C, C, etc. A different dimension.
Leavening agent - part of the candy and chocolate add leavening agent,

can contribute to ribosomes produce carbon dioxide, which play the role

of leavening. Leavening agents are WSD Aluminum hydroxide  commonly used sodium bicarbonate,

ammonium bicarbonate, composite leavening agent.
Sour agent - part drinks, candy and other sour agent often used to

regulate and improve the flavor effect. Common citric acid, tartaric

acid, malic acid, lactic acid and the like.
Brightener - benzoyl peroxide is the main ingredient of flour

brightener. China's food allowed in the flour to add maximum dose of

0.06g/kg. Brighteners exceeded, will destroy the nutritional flour

produced after acid hydrolysis may cause liver damage, benzoyl peroxide

in the EU and other developed countries has been banned as a food

additive. Green food production, processing, A grade, AA grade products

depending on the product itself or production needs, food additives can

be used in AA grade green food only allows the use of natural food

additives are not allowed to use synthetic chemical food additives, in

A grade green synthetic chemical can be used in food additives, in

green food production, in accordance with national standards and

reasonable use of additives, it is because, in addition to raw, fresh,

and can achieve commercial sterility of conditions of production,

storage, unpackaged food, processed foods have direct or indirect, more

or less use of food additives, the raw salt Take for example, our legal

elements in salt iodization, and adding iodine supplements, food

additives is in a class. So green food production enterprises,

especially the production and processing products.
Food additives to improve food quality and color, smell, taste, shape,

nutritional value, as well as the preservation and processing of food

needed to join in chemical synthesis or natural substances, green food

processing products, in production should be higher level, the rational

use of additives, developed a variety of varieties of products and

constant innovation to meet consumer needs, according to the current

food processing enterprise view of the problems reflected in the use of

food additives on the main The following two questions:
First, because the safety of food additives, misunderstanding, people

tend to think that natural than synthetic chemical food additive

safety, the actual toxicity of many natural products due to the current

detection methods, content detection limit, still can not make accurate

judgment, and, comparing the detected results had natural food additive

is not smaller than synthetic toxicity.

Effect on the performance of PVC heat stabilizers how much you know

A series of complex organic PVC heat stabilizers have begun to enter the market and gradually replaced the traditional heavy metal stabilizers.
PVC heat stabilizers are indispensable in the process additives , awareness of their concerns with human health and  iron oxide black the surrounding environment is gradually increased, the world has promulgated a series of measures to limit the use of heavy metal heat stabilizers .
Outside the industry generally believe that awareness of PVC heat stabilizers environmental protection has become an irreversible trend, in the process of environmental protection PVC heat stabilizer , research and development , non-toxic , non-polluting , complex , and efficient heat stabilizers have been more widely application .
PVC resin having a self- HCL released catalytic or structural instability polyolefin produced PVC resin capable of addition reflection to prevent or reduce the decomposition of PVC resin . General characteristics of the formulations selected thermal stabilizer , features and requirements of the article to be considered. Here are some characteristics of people stabilizer :
1 lead salt stabilizer is mainly used in hard articles . Lead salt stabilizer has good heat stabilizers , excellent electrical properties , low cost and so on. However, its toxicity, easily contaminated products , can only produce opaque products. In recent years, large  iron oxide yellow numbers of composite stabilizer , stabilizer dangerous single component has been replaced . Features composite stabilizer is a dedicated and strong, little pollution , the advantages of simple ingredients and processing enterprises . But because no uniform standard , so the difference between the various composite stabilizer great .
2 barium cadmium -based stabilizers is a better performance heat stabilizers . PVC plastic sheeting used in wider . Usually barium cadmium and zinc and organic phosphite antioxidants and use .
3 . Calcium zinc stabilizers can be used as non-toxic stabilizers used in food packaging and medical devices, pharmaceutical packaging , but its stability is relatively low education , calcium -based stabilizers large amount of poor transparency , easy to bloom . Calcium zinc stabilizers usually used polyols and antioxidants to improve its performance, the PVC heat stabilizer  country has recently been Ca-Zn composite stabilizer for rigid pipes appear.
4 good thermal properties of the organic tin-based stabilizers , are preferred species for the transparent rigid PVC products , particularly octyl tin packaging products become almost indispensable toxic stabilizers .

PVC composite heat stabilizer

Stabilizers to an increased solution, gel, solid, chemical stability of the mixture. It can slow down the reaction, to maintain chemical balance, reduce surface tension and prevent light, thermal decomposition or oxidative decomposition effect. Generalized chemical stabilizers wide range of sources, mainly based formulation designed to organic pigments  designers, the flexibility to use any chemicals to achieve the purpose of product quality and stability. Narrowly speaking, mainly refers to maintaining high polymer plastics, rubber, synthetic fibers such as stability, to prevent its decomposition, the aging of the reagent. PVC sheet composite heat stabilizer is a compound of lead from the dust symbiotic (Co-reaction) reaction technology, to ensure thermal stability of the base element composition (such as two. Three salt, metal soaps) in the reaction system was in the beginning of the body Eco grain size and mixed with various lubricants to ensure the  potassium stearate product groups were thoroughly mixed uniformly PVC products widely used performance indicators:
1, at the processing temperature can improve the stability, effectively prevents a partial coking material.
2, compatibility with PVC and dispersion, and do not migrate, non-blooming, easy to be water, oil or solvent dissolution without grinding.
3, to improve the flow properties of PVC materials, to facilitate a smooth process, improve product yield, reduce processing machinery running wear.
4, not only the ability to learn a better defense, and electrical properties of products, high frequency welding, adhesion and second processing performance is also good.
5, various additives to reduce the potassium soap deposition surface in the processing machinery, product appearance and good quality.
6, reduce pollution, reduce labor intensity, inexpensive, easy to use.

Lead-based heat stabilizer and application

Heating and kneading under the  plastic flame retardant conditions of a synergistic effect of various lead salt stabilizer, heat stabilizer and external auxiliary lubricant fully
Mixed into granules or flakes of lead salt composite stabilizer products. Lead salt compound heat stabilizer application has advantages: 
The various components in the production process can be fully mixed with the resin mixed and dispersed greatly improved uniformity.  reasonably stable
Fixed dose selection and matching, to maximize the strengths of each component and the synergistic effect and increase product cost.  with efficient lubrication
Agent mix, has a wide range of processing, to increase applicability.  formulation mix, reducing the  PVC lubricants  measurement error, thereby reducing
Small losses.  simple supply and reserves of the  Metal soap materials is conducive to production and quality management.  clean production products,
Improved production conditions. Composite lead stabilizers trends:  functional, professional, personalized 
 low lead Pb-free lead salts to improve their performance