In the previous article we introduced two kinds of plastics, PFA and PTFE, and gave a detailed account of the properties and uses of these two kinds of plastics, and today we will introduce the second most used fluoroplastic: PVDF.
1. Simple overview of PVDF
PVDF (full name: polyvinylidene fluoride) is a homopolymer of VDF or a small amount of modified monomer and VDF copolymer, belongs to the melt-processing fluorine resin, is the second largest fluorine resin in the market size after PTFE. PVDF is obtained by polymerization of VDF, and copolymerized monomers such as HFP, CTFE, TFE can be added during polymerization in order to modify it, usually for the purpose of resisting changes in the impact strength and elongation.
2. PVDF's properties
PVDF's working temperature range of -60 ° C to 150 ° C (according to the manufacturer and additives of different slight difference), has good chemical corrosion resistance, hydrolysis resistance, UV resistance, and its mechanical strength is better than other fluorine resins.
PVDF has good physical properties, as follows:
(1) easy to process, can be easily processed into a variety of stable mechanical components;
(2) made of paint used in the construction industry to enhance the building materials such as corrosion resistance, abrasion resistance, pollution resistance, durability, etc.;
(3) The film made of it has better light transmittance and UV resistance;
(4) The orientation of the film also has piezoelectric properties, can be used in sound transmission devices and acoustic wave drive and other fields.
3. The traditional application of PVDF - PVDF powder coating
In the previous discussion, we know that PVDF has many excellent properties, so it has been widely used in the field of coatings. PVDF powder coating commercialized since 1965, are used in landmark buildings such as Chengdu Tianfu International Airport, Harbin Taiping International Airport, Capital International Airport, Shanghai World Financial Center in China, Kuala Lumpur Twin Towers in Malaysia, and Shanghai Oriental Pearl Tower. Due to its excellent anti-aging properties, PVDF coatings have been used outdoors for 20 years with little change in appearance.
In the past, PVDF powder coating had the problem of over-thickness and insufficiently flat surfaces compared to traditional liquid coatings. However, with the progress of science and technology as well as the concept of sustainable development is deeply rooted in people's hearts, the problems of environmental pollution and energy consumption of liquid coatings are becoming more and more obvious; on the other hand, the breakthroughs and applications of ultra-fine powder coating technology have greatly improved the use of powder coatings, and the ultra-fine PVDF powder coating are more environmentally friendly, efficient, and economical compared to the liquid coatings, the competitiveness of the PVDF powder coating compared to other coatings has also thus become stronger and more difficult to be replaced.
Due to the superior performance of PVDF in the field of coatings, in 2017, 65% of PVDF was used in coatings in China. However, with the development of technology, PVDF is becoming more and more important in fields other than coatings. So much so that by 2022, the percentage of PVDF used in coatings drops to 30%. In our next post, we'll reveal why, and show our readers new applications of PVDF.
If you have any further questions, you can contact us directly at [email protected] and we will do our best to answer them.
Fluoroplastics Series:
Fluoroplastics Series (1) - Yize Mould had successfully design and manufacture PFA tube fittings
Fluoroplastics Series (2) - What are the Applications of PFA?
Fluoroplastics Series (3) - What are the similarities and differences between PFA and PTFE?
Fluoroplastics Series (4) - What are the applications of PTFE?
Fluoroplastics Series (5) - What is PVDF?
Fluoroplastics Series (6)--New Applications of PVDF
Fluoroplastics Series (7) - FEP performance
