Powder calcium zinc stabilizer, also known as Ca-Zn stabilizer, is a revolutionary product that aligns with the advanced concept of environmental protection. Notably, this stabilizer is free of lead, cadmium, barium, tin, and other heavy metals, as well as harmful compounds, making it a safe and eco-friendly choice for various applications.
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The outstanding thermal stability of the Ca-Zn stabilizer ensures the integrity and durability of PVC products, even under high-temperature conditions. Its lubricity and dispersion properties contribute to smoother processing during manufacturing, enhancing the overall efficiency of production.
One of the unique features of this stabilizer is its exceptional coupling ability, facilitating a strong bond between PVC molecules and further improving the mechanical properties of the final products. As a result, it meets the stringent requirements of the latest European environmental protection standards, including REACH and RoHS compliance.
The versatility of powder complex PVC stabilizers makes them indispensable across several industries. They find extensive application in wires and cables, ensuring reliable and long-lasting performance in electrical installations. Moreover, they play a vital role in window and technical profiles, including foam profiles, providing the necessary stability and strength for diverse architectural and construction applications.
Item
Ca Content %
Recommended Dosage (PHR)
Application
TP-120
12-16
4-6
PVC wires ( 70℃ ）
TP-105
15-19
4-6
PVC wires ( 90℃ ）
TP-108
9-13
5-12
White PVC cables and PVC wires ( 120℃ ）
TP-970
9-13
4-8
PVC white flooring with low/middle extrusion speed
TP-972
9-13
4-8
PVC dark flooring with low/middle extrusion speed
TP-949
9-13
4-8
PVC flooring with high extrusion speed
TP-780
8-12
5-7
PVC foamed board with a low foaming rate
TP-782
6-8
5-7
PVC foamed board with a low foaming rate, good whiteness
TP-880
8-12
5-7
Rigid PVC transparent products
8-12
3-4
Soft PVC transparent products
TP-130
11-15
3-5
PVC calendering products
TP-230
11-15
4-6
PVC calendering products, better stability
TP-560
10-14
4-6
PVC profiles
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TP-150
10-14
4-6
PVC profiles, better stability
TP-510
10-14
3-5
PVC pipes
TP-580
11-15
3-5
PVC pipes, good whiteness
TP-
8-12
4-6
PVC foamed board with a high foaming rate
TP-
8-12
4-6
PVC foamed board with a high foaming rate, good whiteness
Additionally, the Ca-Zn stabilizer proves highly beneficial in the production of various types of pipes, such as soil and sewer pipes, foam core pipes, land drainage pipes, pressure pipes, corrugated pipes, and cable ducting. The stabilizer ensures the structural integrity of these pipes, making them durable and suitable for a wide range of applications.
Furthermore, the corresponding fittings for these pipes also benefit from the Ca-Zn stabilizer's exceptional properties, ensuring a secure and reliable connection.
In conclusion, the powder calcium zinc stabilizer exemplifies the future of environmentally responsible stabilizers. Its lead-free, cadmium-free, and RoHS-compliant nature aligns with the latest environmental standards. With remarkable thermal stability, lubricity, dispersion, and coupling ability, this stabilizer finds widespread use in wires, cables, profiles, and various types of pipes and fittings. As industries continue to prioritize sustainability and safety, the powder calcium zinc stabilizer stands at the forefront of providing effective and eco-friendly solutions for PVC processing.
Introduction:
Manufacturers of UPVC pipes using lead stabilizers often face problems, when they shift to Zn-Ca stabilizers.
The stabilizing power of Zn-Ca stabilizer is lower than lead stabilizers. Whenever processors try to increase stabilizer level to increase stability, they face problems like waviness, colour variation, lines and deposit on calibrator, lower impact strength etc. attributed to over lubrication.
On the other hand, some of the reasons for the emergence of Zn-Ca stabilizers are specific problems like cost, toxicity, cross staining, non suitability for food applications etc. occurring with other stabilizer systems.
FDA grade Zn-Ca stabilizers used for UPVC pipes are usually in powder form.
Role of lubricants in solid stabilizer:
It is advisable that solid process stabilizers tend to be either lubricants or materials that coordinate to and travel with the lubricants to the point of strain.
Zn-Ca stabilizer systems mostly consist of Zn and Ca soaps (metal carboxylates), with other additives.
These soaps being lubricants affect the lubricity of Zn-Ca stabilizers system during processing.
The problem:
Whenever Zn: Ca stabilizer needs to be increased for increasing stability, lubricating effect also increases. On the other hand, if it is reduced to match lubrication requirements, the stability reduces.
This compels Zn: Ca stabilizer manufacturers to use costabilizers to provide additional stability as well as to match the lubricity.
FDA grade – Zinc - Calcium compounds are available in powder, paste or liquid forms.
To improve its effectiveness and efficiency, many ingredients such as – β di ketone, salts, soaps, bases, antioxidants, mineral co stabilizers like hydrotalcites, zeolites or similar materials, polyols, chelators, plasticizers, ESBO etc. are added to the Zn: Ca stabilizer system.
As a result, Zn-Ca stabilizer systems are proprietary, more versatile, usually custom made and available in many grades. This poses problems to the user in terms of its selection, use and compound modification to suit their processing.
Lubricity of Zn-Ca system -
Zinc soaps of fatty acids (Lauric –C 12, Myristic – C 14, Palmitic – C 16, Stearic – C 18 acids) are primary stabilizers.
The secondary stabilizer is more di polar than primary stabilizer.
If the cations (+ ve charge) are metals like Ca, and anions (- ve charge) are long chain carboxylates (laurates or stearates), the resultant mixed metal blend will be in powder form.
Balancing the lubrication in the Zn-Ca stabilizer system:
1. If anions present are long chain carboxylates (laurates - C 12 to stearates - C 18), the resultant mixed metal blend is powder.
2. As the length of carbon chain is increased, the trend is towards increased lubrication strength, exudation to surface during processing and delayed fusion.
3. On the other hand, if the length of carbon chain is reduced, the resultant blend is liquid, tends to plate out and they are not lubricants.
Moderately lubricating Zn- Ca powders are based on laurates (12 Carbon atoms).
Adjusting lubrication during processing:
Commercially available Zn-Ca stabilizers may not always suit the PVC formulation without adjusting lubrication.
Depending on other ingredients in the formulation as well as prevailing trend of adding different levels of filler, one may find that the lubrication is either more or lower.
Care has to be taken to balance the lubrication, as over or under lubrication may pose processing as well as product quality problems.
Generally, the output of Zn-Ca stabilized compound is lower than lead based formulations.
Also problems like colour variation, flow marks, lines from calibrator as well as failure in impact properties are encountered.
However, with the adjustment of lubrication level as well as by adding costabilizers, the output as well as mechanical strength of the pipe can be matched with the pipes from lead stabilized formulations.
Solid carboxylic acids like stearic acid are sometimes added to the powdered blends, if increased lubrication is required.
Benzoic acid may be added if further lubrication is not required. In this case fusion will be promoted and melt viscosity increased.
Incidentally, calcium and zinc terephthalates are non- lubricating and may be incorporated in Zn- Ca stabilizer system.
Polar lubricants like Stearyl stearate is also found useful.
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