Application Of Kynar High Temperature Resistant Heat Shrinkable Tubes

- Dec 11, 2018-

Application History of PVDF heat shrinkable tube Resin Coatings

DuPont in the United States in the 1940s first developed a successful polyvinylidene fluoride, the 1965 study of the successful semi-crystalline polyvinylidene fluoride resin coating, the product is called Kynar¼ ", the coating can not be cured at room temperature, sintering temperature of 240 ℃, but can be used as a high-temperature baking coating" At present, most of these coatings are used in Kynar "00" or Hylar A500 and other PVDF resins, in addition to Japan's Wu Yu Chemical industry kpolymer also belong to similar products "PVDF resin as the main component of the external wall high weather-resistant fluorine resin coating application has more than 40 years of history, In the field of construction applications with long-term use of the coating does not fade! Excellent weatherability! Good flexibility, excellent corrosion resistance and viscosity resistance characteristics of (PVDF coatings need to go through 2,301,250 ℃ baking molten film), so can not be on-site processing and preparation of large workpieces, but very suitable for small size parts of spraying and coil coating, In addition, high performance and price of the coating is not only high requirements for coatings, but also high requirements for coating technology and equipment (quality certification), in recent years has gradually developed the relevant paint and coating evaluation technical standards, such as GB5237 12,008 aluminum alloy building profile standards; gb/ T17748 12,008 building curtain wall with aluminum-plastic composite plate standard; hg/t3793 12,005 hot-melt fluorine resin (PVDF) coating standard; gb/t13448 12,006 color coated steel plate and steel belt test method, but are based on the United States AA2605 or ASCA standards on the basis of the development.

The application of PVDF heat shrinkable tube fluorocarbon resin coating in any coil coating has been quite common in foreign countries.

Fluorocarbon coating can not be used alone, its supporting primer commonly used by the cool primer, Epoxy primer and Fluorine carbon primer, its advantages and disadvantages, epoxy primer on the substrate adhesion is excellent, corrosion resistance is also more prominent, but the flexibility of this primer is poor, sensitive to ultraviolet rays, very easy to be damaged by ultraviolet rays " Coldplay Primer flexibility than epoxy primer has a great improvement, but with PVDF topcoat matching is not good, acrylic primer also has this problem, although these types of primers in the substrate adhesion, corrosion resistance and other aspects have a certain advantage, but with PVDF topcoat, supporting and weather-resistant compared to fluorine carbon primer there is a certain gap, Especially in the harsh weather conditions of the building requirements for long-term use of the occasion "fluorine carbon Primer excellent weatherability, and PVDF fluoride coating strong, but expensive"

In addition to the application of coil coatings, PVDF fluorocarbon resin coatings are also used in the way of spraying processing on a variety of metal profiles with metal substrates such as aluminum alloy galvanized steel and stainless steel, before painting, should first remove the surface of dirt, paint and oxidation, etc., can be polished, surface cleaning, chemical skimming and other processes to achieve the goal, Then a layer of chemical conversion film is formed on the surface, such as the surface treatment of aluminum alloy chromate, the surface phosphating treatment of galvanized steel or the composite treatment of oxidation drill, etc., in order to improve the bonding strength of the coating and substrate.

For more information, please contact to 

lily@gzhelectric.com

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Kynar耐高温热缩管的产生于应用

PVDF热缩管树脂涂料的应用历史

美国杜邦公司在20世纪40年代首先研制成功聚偏二氟乙烯,1965年研究成功半结晶聚偏二氟乙烯树脂涂料,商品名为Kynar¼",该涂料不能常温固化,烧结温度为240℃,但可作为高温烘烤涂料"目前这类涂料大部分使用的是Kynar“00”或Hylar A500等PVDF树脂,此外日本吴羽化学工业的Kpolymer也属于同类产品"以PVDF树脂为主要成分的外墙高耐候氟树脂涂料应用己有40年的历史,在建筑领域应用具有长期使用涂层不褪色!优良的耐候性!柔韧性好!极佳的耐粉化性和耐粘污性等特点〔PVDF涂料需经过230一250℃烘烤熔融成膜),因而不能现场加工和制备大型工件,但非常适用于小尺寸部件的喷涂和卷材涂装,另外高性能高价格的涂层不仅对涂料要求高,而且对涂装技术和设备要求高(质量认证),近年来国内己逐渐制定了的相关的涂料和涂料评价技术标准,如GB5237一2008铝合金建筑型材标准;GB/T17748一2008建筑幕墙用铝塑复合板标准;HG/T3793一2005热熔型氟树脂(PVDF)涂料标准;GB/T13448一2006彩色涂层钢板及钢带试验方法,但均以美国AA2605或ASCA标准为基础来制定的.

PVDF热缩管氟碳树脂涂料任卷材涂装中应用在国外已相当普遍

氟碳涂料不能单独使用,其配套底漆普遍采用的聚酷底漆、环氧底漆和氟碳底漆,其各有优缺点,环氧底漆对基材的附着力极佳,耐腐蚀性也较为突出,但是这种底漆的柔韧性较差,对紫外线较为敏感,很容易被紫外线破坏"聚酷底漆柔韧性较环氧底漆有很大改善,可是与PVDF面漆配套性不好,丙烯酸类底漆也存在这种问题,尽管这些类型的底漆在基材附着力、耐腐蚀性等方面具有一定的优势,但配以PVDF面漆,配套性和耐候性较氟碳底漆存在一定的差距,特别是气候恶劣条件下建筑要求长久使用的场合"氟碳底漆耐候性优异,与PVDF氟碳面漆结合力强,但价格昂贵"

除了卷材涂料中的应用,PVDF氟碳树脂涂料还以喷涂加工的方式用于各种金属型材上跟金属基材如铝合金镀锌钢和不锈钢等,在涂装前,应首先除去表面的污物、油漆和氧化反等,可以通过打磨、表面清洗、化学脱脂等工艺达到目的,然后在表面上形成一层化学转化膜,如铝合金铬酸盐表面处理,镀锌钢材表面磷化处理或氧化钻复合处理等,目的是提高涂层与基材的给合强度。

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