OPE wax for foam board

OPE wax for foam board Specification

Storage
Room Temperature

Usage
Recommended dosage: Typically 0.3 0.5 phr for integral-skin foam boards; do not exceed this range. Dosages >0.8 phr can cause surface hazing, reduced gloss, and compromised mechanical properties. It is common to combine this with a small amount of PE wax (0.2 0.3 phr) to supplement late-stage external lubrication and create a balanced lubrication system.

Shelf Life
2 Years

Physical Form
Powder

Melting Point
130~140

Taste
Other

HS Code
390490

Application
Industrial

Shape
other

Poisonous
NO

Grade
OX316

Product Type
General chemical

Properties
Oxidized wax serves as a core lubricant and processing aid in PVC foam board formulations. Leveraging its polar carboxyl and hydroxyl groups, it provides both internal and external lubrication, facilitates filler dispersion, and enhances melt strength; it directly determines cell structure, surface appearance, and extrusion stability. Foam boards demand higher standards for melt strength, balanced plasticization, and lubrication compared to standard solid boards, and oxidized wax is the key material for addressing the specific challenges of this system.

Smell
Other

Purity
100%

OPE wax for foam board About

Oxidized wax serves as a core lubricant and processing aid in PVC foam board formulations. Leveraging its polar carboxyl and hydroxyl groups, it provides both internal and external lubrication, facilitates filler dispersion, and enhances melt strength; it directly determines cell structure, surface appearance, and extrusion stability. Foam boards demand higher standards for melt strength, balanced plasticization, and lubrication compared to standard solid boards, and oxidized wax is the key material for addressing the specific challenges of this system.

1. Five Core Functions in Foam Boards

1. Regulating plasticization and balancing internal/external lubrication

Its polar groups are highly compatible with PVC, providing internal lubrication by reducing friction between PVC molecules and promoting uniform plasticization. Meanwhile, the carbon chain segment provides external lubrication, reducing friction between the melt and metal components (screw and die), improving mold release, and preventing sticking or material scorching.

Foaming processes are highly sensitive to two issues: insufficient plasticization (leading to coarse cells and a crumbly surface) and excessive plasticization (causing a loss of melt strength and cell collapse). Oxidized wax allows for the smooth regulation of the gelation rate, preventing erratic fluctuations.

2. Dispersing calcium carbonate and blowing agents

In high-calcium-filled foam boards, calcium carbonate tends to agglomerate. The polar groups of the oxidized wax wet the powder particles, ensuring uniform dispersion of calcium powder and AC blowing agents. This prevents localized clustering of blowing agents, thereby reducing surface defects such as pinholes, pits, and uneven cell sizes.

3. Enhancing melt strength and stabilizing cell structure (critical for foaming)

During foaming, the AC blowing agent releases gas; the melt requires sufficient toughness to "contain" the bubbles without rupture, coalescence, or collapse. A suitable high-density oxidized wax enhances the melt's strain-hardening capability, resulting in a fine, uniform cell structure necessary for low-density foam boards. Insufficient melt strength leads to large bubbles, perforations, and voids in the board core.

4. Improving the appearance of the integral skin layer

It facilitates the formation of a complete, dense skin layer, enhancing surface gloss. It also reduces die plate-out and buildup, making it suitable for long-term continuous production while minimizing surface defects such as pitting and clouding marks. Compared to standard PE wax, oxidized wax carries a lower risk of plate-out (migration/exudation).

5. Reduces equipment wear

High-calcium formulations cause significant wear on screws and barrels; the lubricating film formed by oxidized wax mitigates the abrasive effect of powders on metal components, thereby extending equipment lifespan.

2. Impact of parameter selection on foam boards

- Acid Value: A medium acid value (1828 mg KOH/g) is standard for foam boards. Excessively high acid values lead to excessive internal lubrication and rapid plasticization, risking over-plasticization and foam collapse. Conversely, excessively low acid values result in insufficient polarity, poor dispersion, and increased plate-out.

- Molecular Weight / Viscosity: High-density, higher-viscosity OPE waxes are preferred as they significantly enhance melt strength. Low-viscosity oxidized waxes focus primarily on flow and offer poor melt strength enhancement, making them unsuitable for low-density foam boards.

> Recommended dosage: Typically 0.30.5 phr for integral-skin foam boards; do not exceed this range. Dosages >0.8 phr can cause surface hazing, reduced gloss, and compromised mechanical properties. It is common to combine this with a small amount of PE wax (0.20.3 phr) to supplement late-stage external lubrication and create a balanced lubrication system.

3. Typical foam board defects caused by improper use of oxidized wax

1. Insufficient dosage: Under-plasticization; results in coarse cells, rough board surfaces, and material sticking to the die.

2. Excessive dosage: Over-plasticization; results in reduced melt strength, cell collapse, brittleness, and a hazy board surface.

3. Incorrect grade (low viscosity/low acid value): Insufficient melt strength; prevents the production of low-density boards and leads to cell rupture.

4. Lubrication imbalance: Improper ratios with polyol esters or PE wax can lead to blooming (exudation) and die buildup. 4. Fundamental differences between oxidized wax and standard PE wax in foam boards

- Standard PE wax: Provides almost exclusively external lubrication and has poor compatibility with PVC; primarily serves as a mold-release agent. It offers little to no improvement in melt strength; using it alone in foam boards often leads to uncontrolled cell structure, so it is generally used only as a supplementary external lubricant.

- Oxidized wax (OPE): Combines internal and external lubrication and offers good compatibility. It provides both dispersing properties and enhanced melt strength, serving as the primary lubricant component in foam board formulations.

5. Summary of formulation logic

Foam board logic: Stabilizer + Blowing agent + ACR foaming regulator (primary source of melt strength) + Oxidized wax (lubrication + auxiliary melt strength + dispersion) + PE wax (late-stage external lubrication) + Calcium powder.

ACR regulators are the key driver of melt strength; while oxidized wax cannot replace ACR, it maximizes ACR's effectiveness through lubrication and dispersion. The two work synergistically to produce fine, uniform cells and a smooth surface skin.

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