BX PVC Heat Stabilizer

Introduction – What is PVC Stabilizer?

When PVC is at 100-150°C, ultraviolet light, mechanical force, oxygen, ozone, hydrogen chloride, and some active metal salts and metal oxides will accelerate the decomposition rate on the basis of its own decomposition.

For the processing of PVC, thermal decomposition does not change its properties much, mainly affecting the color of the finished product, and adding heat stabilizers can inhibit the initial colorability of the product. In addition, if there is oxygen in the thermal decomposition process of PVC, there will be colloidal carbon, peroxide, carbonyl and ester-based compounds. In this case, it is necessary to add a heat stabilizer in the process of PVC processing, so that to a certain extent, it can replace the unstable chlorine atoms in PVC, absorb hydrogen chloride, and undergo addition reactions with unsaturated parts. Inhibits the degradation of PVC molecules.

Features of PVC Stabilizer

Generally, an ideal heat stabilizer should have the following basic functions:

(1) It has high thermal stability and good light stability.

(2) It has good compatibility with PVC, low volatility, no sublimation, no migration, no frost, and is not easy to be extracted by water, oil or solvent.

(3) Appropriate lubricity, easy to peel off the product from the roller during calendering, without scaling

(4) It does not react with other additives and is not polluted by sulfur or copper.

(5) It does not reduce the electrical properties and printability of the product, the high-frequency weldability, and the adhesiveness of the second processing performance.

(6) It is non-toxic, odorless and non-polluting, and can be made into transparent products.

(7) Easy to process and use, low price

Heat Stabilizer Types

•  Lead salts Heat stabilizer

Lead salts are the most commonly used heat stabilizers for PVC, and their dosage can account for more than half of PVC heat stabilizers.
Advantages: Excellent thermal stability, long-term thermal stability, excellent electrical insulation performance, and good weather resistance.
Disadvantages: poor dispersibility, high toxicity, initial coloring, difficulty to obtain transparent products, and difficulty to obtain brightly colored products, lack of lubricity, to generate sulfur and prevent pollution.

• Metal soap heat stabilizer

The second largest main stabilizer after lead salts in dosage, although its thermal stability is not as good as that of lead salts, it also has lubricity. It is non-toxic except for Cd and Pb, transparent and non-sulfurized except for Pb and Ca. Pollution, so it is widely used in soft PVC, such as non-toxic, transparent and so on. Metal soaps can be metal (lead, barium, cadmium, zinc, calcium, etc.) salts of fatty acids (lauric acid, stearic acid, naphthenic acid, etc.), among which stearate is the most commonly used, and its thermal stability is in the order of four: zinc salt > cadmium salt > lead salt > calcium salt/barium salt. Metal soaps are generally not used alone, and are often used between metal soaps, or in combination with lead salts and organic tin.

• Organotin heat stabilizer

Organotin is the most effective and widely used class of heat stabilizers, and its outstanding advantages are: superior heat stability, and good transparency, and most of them are non-toxic. The disadvantage is that the price is high (but the amount added is small, generally only 0.5~2 parts), and another major disadvantage is that most of them have no lubricity. Most organotins are liquid, only a few are solid. It can be used alone or often combined with metal soap.

• Organic Antimony heat stabilizer

This is a new type of PVC heat stabilizer. It has excellent initial hue and hue retention, especially when used in low amounts, and its thermal stability is better than that of organotins. It is especially suitable for PVC formulations in twin-screw extruders.

• Rare earth stabilizer

The stabilizer is a unique stabilizer developed by our country and is a new type of heat stabilizer. Rare earth elements include 15 lanthanide elements with original serial numbers ranging from 57 to 71 and 17 elements in total, such as yttrium and thorium, which are similar to them.

• Liquid composite Heat Stabilizer

The liquid composite heat stabilizer is composed of organometallic soaps, phosphites, hindered phenol antioxidants, and solvents. Organometallic soaps are the main components of liquid complex stabilizers. The main products are liquid barium/cadmium/zinc, barium/cadmium, calcium/zinc, barium/zinc and other composite stabilizers, which have been used in soft PVC calendered film, hard PVC transparent sheet, PVC transparent bottle, etc.

BX PVC Heat Stabilizer Products

Heat Stabilizer by PVC process

Baoxu offer heat stabilizer by PVC process below

1. Heat Stabilizer for PVC Foaming
2. Heat Stabilizer for RPVC Extrusion
3. Heat stabilizer for Calendered packaging
4. Heat Stabilizer for RPVC Injection
5. Heat Stabilizer for Transparent PVC
6. Heat Stabilizer for opaque PVC

Heat Stabilizer by Applications

Baoxu offer heat stabilizer by applications below

1. Heat Stabilizer for PVC pipe, fittings
2. Heat Stabilizer for PVC foaming
3. Heat Stabilizer for PVC window, profile
4. Heat Stabilizer for PVC wire, cable
5. Heat Stabilizer for PVC plate, sheets
6. Heat Stabilizer for PVC film

Brochure

Heat Stabilizer brochure baoxu chemical

plastic additive brochure baoxu chemical

Sample and Inquiry

Please contact our online sales or mail at info@additivesforpolymer.com for a sample and general inquiries.