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Is dimethyl silicone oil emulsion suitable for polyurethane (PU) foamed floor mats?
Source:AI+MODIFY Author:QL CHEMICAL Release time:2025-12-12 11:47 Reading times:72

Suitability Analysis of Dimethyl Silicone Oil Emulsion for Polyurethane (PU) Foamed Floor Mat Mold Release

Conclusion: Yes, dimethyl silicone oil emulsion is highly suitable for mold release of PU foamed floor mats and is a mainstream choice in the market.

1. Why is dimethyl silicone oil emulsion particularly suitable for PU foamed floor mats?

1.1 Perfectly matches the high adhesion characteristics of PU foaming

PU foam materials have strong adhesion to mold surfaces due to the large number of polar groups in their molecular structure. Dimethyl silicone oil emulsion can form a uniform lubricating film with low surface energy on the mold surface, effectively overcoming the high adhesion of PU foam materials and achieving smooth mold release.

1.2 Thermal stability perfectly aligns with PU foaming process

The production temperature of PU foamed floor mats is usually 170-230℃, and dimethyl silicone oil emulsion has a heat resistance of 180-250℃, which fully meets the process requirements. It also has good thermal stability and will not decompose under high temperature to affect product quality.

1.3 Forms a durable mold release film to significantly improve production efficiency

High-quality dimethyl silicone oil emulsion (especially the composite system containing silicone resin) can achieve 3-10 consecutive mold releases with one coating, reducing downtime and improving production efficiency.

2. Recommended Products and Technical Parameters

2.1 Optimal viscosity selection

It is recommended to use dimethyl silicone oil emulsion with a viscosity of 350-1000 cSt (mm²/s), which is the golden viscosity range for mold release of PU foamed floor mats:
  • Below 350 cSt: Insufficient film-forming strength and poor durability
  • Above 1000 cSt: Increased emulsification difficulty, higher cost, and potential impact on mold release effect

2.2 Recommendations for high-quality commercial products

Product Model Features Application Scenarios Recommended Dilution Ratio
EA-43 Aqueous emulsion of polydimethylsiloxane, strong mold release force, medium to high gloss, cost-effective, free of REACH-prohibited ingredients PU rigid foam floor mats 1:10~1:15
AT-303 Aqueous silicone emulsion, non-toxic and non-flammable, specially designed to solve the problem of difficult mold release due to strong adhesion of thermosetting foamed PU Various PU foamed products 1:8~1:12
TPD-4210-50 Composite system containing silicone resin, forms a hard high-melting point film, avoiding the defoaming effect of silicone oil High-density PU foaming 1:15~1:20
Silway 5388 80% high solid content, non-ionic, uniform film formation, durable Mass production 1:20~1:30

3. Usage Notes

3.1 Formula optimization suggestions

Optimal formula combination: Dimethyl silicone oil (1000 cSt) + 5-10% silicone resin composite system, which can form a more durable mold release film and prevent silicone oil migration from affecting product performance.

3.2 Key usage methods

  • Mold pretreatment: Thoroughly clean the mold to remove oil stains and residual mold release agent, ensuring a clean surface
  • Dilution and preparation: Dilute strictly according to the product manual (usually 1:10~1:20), and use deionized water for dilution
  • Coating methods:
    • Spraying: 0.8-1.0mm spray gun, 5-6kg pressure, uniform atomization
    • Brushing: Suitable for complex mold structures, ensuring no omissions
  • Drying conditions: 3-5 minutes at room temperature or 1-2 minutes baking at 60-80℃ to ensure complete drying and film formation

4. Why are other types of mold release agents not recommended?

4.1 Comparison with oil-based mold release agents

  • Disadvantages: Pollutes the environment, difficult to clean residues, affects subsequent processing (such as printing, lamination), and does not meet modern environmental requirements
  • Advantages: Good single mold release effect, but overall performance is far inferior to aqueous silicone oil emulsion

4.2 Comparison with wax-based mold release agents

  • Application scenarios: Only suitable for special PU products with extremely high surface gloss requirements
  • Limitations: Poor heat resistance (≤150℃), weak mold release durability, not suitable for high-temperature PU foaming processes

5. Summary and Recommendations

Dimethyl silicone oil emulsion is an ideal choice for mold release of PU foamed floor mats, especially aqueous silicone oil emulsion with a viscosity of 350-1000 cSt or composite systems containing silicone resin.
Recommended procurement and usage strategies:
  1. Prioritize specialized PU foaming mold release agents from well-known brands such as EA-43 and AT-303
  2. Conduct small-batch tests before first use to determine the optimal dilution ratio and coating amount
  3. Strictly follow the principle of "thin and uniform coating, complete drying" to achieve the best mold release effect and longest service life
Note: If the product has special surface treatment requirements (such as high gloss, adhesion requirements), it is recommended to consult the supplier to select a modified silicone oil emulsion with a specialized formula.

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