Lead phosphite,dibasic

• CAS: 12141-20-7
• Catalog Number: ACM12141207
• Category: Main Products
• Molecular Weight: 733.58
• Molecular Formula: HO₅PPb₃
• Synonyms: Leadoxidephosphonate;leadoxidephosphonate(pb3o2(hpo3));LEAD PHOSPHITE, DIBASIC;trilead dioxide phosphonate ;plumbous phosphite;Dibasic Lead Phosphite;Dibasic lead(ii) phosphite;Einecs 235-252-2
• IUPAC Name: hydrogenphosphite;lead(2+);oxolead
• Canonical SMILES: OP([O-])[O-].O=[Pb].O=[Pb].[Pb+2]
• InChI Key: LAZQCXJJXWHRDJ-UHFFFAOYSA-N
• Appearance: Solid
• EC Number: 235-252-2
• Exact Mass: 735.88600
• Hazard Statements: Xi,Xn,F
• Packing Group: III
• Safety Description: S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .; S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .; S20:When using, do not eat or drink .
• Stability: Stability
• WGK Germany: 3

Case Study

Effect of Dibasic Lead Phosphite as a Thermal Stabilizer on the Decomposition Temperature of Chemical Blowing Agents

Douibi A, et al. International Journal of Engineering and Technology, 2014, 14(2), 60-64.

The effects of PVC resin and common additives on the decomposition temperature (Td) of azodicarbonamide (ABFA) and their interactions were investigated. The addition of kickers (thermal stabilizers, including dibasic-lead-phosphite) to ABFA resulted in lower Td. Furthermore, it was noted that lead metal based kickers showed the strongest activation effect on Td.
Effect of dibasic Lead phosphite on ABFA
· Accelerators based on lead metal (dibasic lead phosphite) exhibited the strongest activation effect on the decomposition temperature of ABFA.
· It was noted that the experimental Td of the mixture was significantly lower than the predicted Td. This discrepancy can be attributed to the interactions between the kicker and PVC when they are in combination. The presence of the kicker, which serves as a thermal stabilizer, neutralizes the evolved HCl, leading to the elimination of the PVC's effect and allowing the kicker to act predominantly on its own. This occurrence was only evident at a low heating rate.
· At higher heating rates, the decomposition temperature would be delayed, eventually reaching the PVC degradation limit even in the presence of the stabilizer. The increased amount of evolved HCl would then catalyze the PVC degradation, rendering the stabilizer less effective in neutralizing the HCl and resulting in the PVC's predominant role in inhibiting the Td. Consequently, a higher Td than the predicted value would be achieved.

Application of Dibasic Lead Phosphite and Its CALS Production Technology

Kvasyuk A, et al. Chemical Engineering Transactions, 2012, 29(2), 853.

· The composition and structure of dibasic lead phosphite are suitable for stabilizing chlorinated polymers, such as polyvinyl chloride, as it also gives plastics heat resistance and light resistance. The high proportion of lead in the basic salt ensures sufficiently high stability.
· In addition, dibasic lead phosphite is also used in rigid and plasticized cable compositions based on polyvinyl chloride. The photoresist effect of dibasic lead phosphite is better than other known lead salts and has antioxidant properties. It is used in small quantities and at relatively low temperatures (< 200°С).
· Moreover, dibasic lead phosphite is often mixed with tribasic lead sulfate to improve the color of the product and stabilize it.
· The continuous acquisition and life cycle support (CALS) technology can be used in industrial production for the treatment of phosphorus sludge. This work develops a flexible three-product scheme for the treatment of phosphorus sludge, allowing the combination of three productions, namely sodium phosphite and sodium hypophosphite, as well as dibasic lead phosphite.

Study of the anticorrosion properties of dibasic lead phosphite pigments

Bethencourt, M., et al. Progress in Organic Coatings 46.4 (2003): 280-287.

The anticorrosion properties of several commercial inhibitor pigments have been studied. The pigments selected are zinc phosphate, zinc chromate, dibasic lead phosphite. Solutions of pigment extracts of the same pH have been used as corrosive media. To evaluate their inhibitory capacity, the pigments have been extracted in 3.5% NaCl solutions at different pH values. This procedure is designed to simulate the behavior of pigments dispersed in paints. The extracted solutions were then used to evaluate the corrosion rate of commercial carbon steel using electrochemical techniques. Carbon steel samples were not immersed in such solutions and their corrosion rates were measured using electrochemical techniques. The data obtained showed that zinc chromate provided the highest percentage of inhibition in neutral and alkaline solutions, but phosphate-based pigments showed better results in acid solutions. Given this performance advantage, as well as their less harmful effects on the environment, these phosphate-based pigments can be proposed as realistic alternatives to chromates in protective coating formulations used under acidic conditions.
In order to simulate the working conditions of the pigments in paints, extracts of dibasic lead phosphite pigments were prepared at room temperature and at different pH conditions. The extraction was performed by shaking 500 mg of pigment in 1 l of 3.5% NaCl solution at 700 rpm for 24 h. The solution was then filtered to remove undissolved pigment. After filtration, the extract was used as an electrolyte to study the corrosion behavior of carbon steel. Each pigment was extracted under three different pH conditions.

Dibasic lead phosphite used in the study of the decomposition temperature of chemical foaming agents

Douibi, Abdelmalek, et al. International Journal of Engineering and Technology 14.2 (2014): 60-64.

Differential thermal analysis (DTA) was conducted to predict the processing properties of foamed rigid PVC compounds. The effects of common additives on the decomposition temperature (Td) of ABFA and their interactions were investigated. Addition of a kicker (heat stabilizer) to ABFA will result in a decrease in Td. Furthermore, it was noted that the kicker based on dibasic Lead phosphite had the strongest activation effect on Td. However, PVC resin had an inhibitory effect on Td. Finally, when the kicker and PVC resin were used together, the former showed a dominant effect at low heating rates, while the latter showed a dominant effect at high heating rates.
In order to predict the processing properties of foamed rigid PVC compounds, the effects of common additives on ABFA Td were examined separately by differential thermal analysis (DTA). In further thermogram determinations, the effects of sample weight and heating rate were investigated. Different heating rates (4, 8, 10, 12, 14 and 16 °C/min) and different sample weights (20, 30 and 42 mg) were used. The raw materials were mixed with PVC in a kitchen blender at full speed for 10 minutes to obtain a dry white free-flowing powder. ABFA was dispersed with all ingredients (dibasic Lead phosphite kicker, lubricant and PVC) by stirring with a high-speed kitchen blender for 10 minutes to obtain a dry white free-flowing powder. The required amount of sample was then loaded into the crucible.

Custom Q&A

What is the molecular formula of lead phosphite, dibasic?

The molecular formula is HO5PPb3.

What are the synonyms of lead phosphite, dibasic?

The synonyms are Trilead dioxide phosphonate, 12141-20-7, Dibasic lead(II) phosphite, hydrogen phosphite; lead(2+); oxolead, and Lead oxide phosphite.

What is the molecular weight of lead phosphite, dibasic?

The molecular weight is 7.3e+02 g/mol.

What are the component compounds of lead phosphite, dibasic?

The component compounds are Lead monoxide (CID 14827) and Lead (CID 5352425).

When was lead phosphite, dibasic created?

It was created on August 8, 2009.

When was lead phosphite, dibasic last modified?

It was last modified on October 21, 2023.

What is the IUPAC name of lead phosphite, dibasic?

The IUPAC name is hydrogen phosphite; lead(2+); oxolead.

What is the InChI of lead phosphite, dibasic?

The InChI is InChI=1S/HO3P.2O.3Pb/c1-4(2)3;;;;;/h1H;;;;;/q-2;;;;;+2.

What is the InChIKey of lead phosphite, dibasic?

The InChIKey is LAZQCXJJXWHRDJ-UHFFFAOYSA-N.

What is the CAS number of lead phosphite, dibasic?

The CAS number is 12141-20-7.