1、High

This review paper presents the most relevant published information on poly (vinyl acetate) paint materials to help inform subsequent research and to provide information on the risks related to the surface cleaning treatment of poly (vinyl acetate) paint or poly (vinyl acetate)-painted works of art.

2、Yellowing mechanisms of epoxy and vinyl ester resins under thermal, UV

Polymer resins have yellowing issue when subjected to elevated temperatures or UV exposure, which limit their applications in color-sensitive fields. This paper presents an experimental study on the yellowing mechanisms of epoxy and vinyl ester resins under thermal, UV and natural aging conditions.

3、Yellowing Mechanisms of Epoxy and Vinyl Ester Resins

Polymer resins have yellowing issue when subjected to elevated temperatures or UV exposure, which limit their applications in color-sensitive fields. This paper presents an experimental study on...

4、Yellowing mechanisms of epoxy and vinyl ester resins under

Yellowing mechanisms of epoxy and vinyl ester resins under thermal, UV and natural aging conditions and protection methods

The Slight Yellowing of Vinyl Acetate

At lower temperatures, vinyl acetate may appear darker yellow; under high temperatures or intense lighting, its color might shift slightly, even exhibiting a faint blue tinge.

High

The high-temperature-resistant yellowing-resistant high- hardness vinyl acetate -acrylic emulsion has the advantages of favorable yellowing resistance, favorable high- temperature resistance and higher hardness.

Formula of yellowing

The invention discloses a formula of a yellowing-resistant polyvinyl acetate emulsion for a fiber shoe insole and a preparation method thereof.

Perspectives on yellowing in the degradation of polymer materials

Presents an expert perspective on the phenomenon of yellowing in the manufacture and processing degradation of polymer materials. Structural and stability relationships are described for thermal stabilisers confirming the role of quinone-imine and methide formation.

The Yellowing of Polyvinyl Acetate

This review paper presents the most relevant published information on poly (vinyl acetate) paint materials to help inform subsequent research and to provide information on the risks related to the surface cleaning treatment of poly (vinyl acetate) paint or poly (vinyl acetate)-painted works of art.

Aspects of the thermal oxidation, yellowing and stabilisation

The thermal oxidation of ethylene-vinyl acetate copolymer [EVA-17 and 28% w/w VA (vinyl acetate) units] has been examined by thermo-gravimetric and hydroperoxide analysis, FTIR (Fourier transform infra-red), fluorescence spectroscopy and yellowness index.

In the chemical industry, vinyl acetate is a critical synthetic material widely used in plastics, adhesives, and coatings. Its stability directly impacts product quality and performance. vinyl acetate tends to yellow during storage and application, which not only affects its appearance but may also reduce its lifespan and performance. studying the yellowing resistance of vinyl acetate is crucial for enhancing its reliability in practical applications.

1. Phenomenon and Impact of Yellowing

Yellowing refers to the color change in materials exposed to light or heat. In vinyl acetate, yellowing manifests as an intensified yellow hue, primarily caused by oxidative reactions of unsaturated bonds under light or thermal stress. Yellowing diminishes aesthetic appeal and may degrade material properties, such as strength and heat resistance. Additionally, it can complicate packaging and transportation, leading to economic losses for enterprises.

2. Mechanism of Yellowing

The yellowing of vinyl acetate is controlled by the following factors:

1. UV Irradiation: Ultraviolet light is a primary trigger for yellowing. It activates unsaturated bonds in the material, initiating oxidation and color changes.
2. Temperature Variations: Elevated temperatures accelerate the activity of unsaturated bonds, promoting oxidation and yellowing.
3. Oxygen Exposure: Atmospheric oxygen reacts with unsaturated bonds, forming peroxides that drive yellowing.
4. Additive Effects: Antioxidants, UV absorbers, and other additives can inhibit yellowing, but they may also affect material performance and cost.

3. Strategies for Improving Yellowing Resistance

To mitigate yellowing in vinyl acetate, the following strategies are recommended:

1. Material Selection: Use yellowing-resistant raw materials, such as formulations with higher copolymer or blend ratios, to reduce yellowing potential.
2. Antioxidant Addition: Incorporate antioxidants like hindered amines or phenolic compounds to suppress oxidation-induced yellowing.
3. Storage Control: Store vinyl acetate away from direct sunlight and high temperatures to slow yellowing.
4. Surface Treatment: Apply yellowing-resistant coatings to protect the material from environmental stressors.

4. Experimental Verification

To validate these strategies, experiments can assess how different factors affect yellowing. For example:

• Vary storage conditions (temperature, humidity, light intensity) to observe yellowing trends.
• Compare the efficacy of different antioxidants in inhibiting yellowing.
• Test the long-term yellowing resistance of surface-treated samples.

5. Conclusions and Prospects

yellowing in vinyl acetate is a complex process influenced by multiple factors. By analyzing mechanisms and conducting experiments, effective anti-yellowing strategies can be developed. Future advancements in materials and technology may enable more efficient and cost-effective solutions to meet industrial demands. Research on vinyl acetate’s yellowing resistance will also provide valuable insights for studying other polymer materials.