色一情一乱一伦麻豆,国产精品综合Av一二三,国产精品久久亚洲av,精品久久综合无码AⅤ,夜夜爱夜鲁夜鲁很鲁,国产黄大片在线观看画质优化,成在人线AV无码免观看,免费无码无遮挡裸体视频在线观看,午夜人性色福利无码视频在线观看,久久激情免费视频

  • <strike id="oa0kk"><rt id="oa0kk"></rt></strike>
  • <strike id="oa0kk"></strike>
    <del id="oa0kk"></del>
  • <fieldset id="oa0kk"></fieldset>
    <strike id="oa0kk"><menu id="oa0kk"></menu></strike>
  • <strike id="oa0kk"></strike>
    The company produces and sells "Yuanzheng" brand matting powder (MATTING AGENT)
    News
    Home > News
    How to solve the leveling problem of home improvement powder coatings What is the specific operation method?
    Time:2021-08-06

    Powder coatings are currently one of the most environmentally friendly coating systems due to their complete absence of organic solvents and low VOC (Volatile Organic Compound) emissions during curing. The so-called leveling property of the coating refers to the smooth and smooth state of the coating film after the coating is applied. The surface with good leveling property should have no irregularities such as orange peel, brush marks, ripples, and shrinkage holes.

    Generally, the method of direct observation with the naked eye is to compare the sample and the standard sample in parallel to judge the pros and cons of the leveling of the coating film. This method varies from person to person and is highly subjective. The wavelength scanning method used in the automobile industry is used to characterize the surface state of the coating film, which has a semi-quantitative effect. Long-wave (10-0.6mm) and short-wave (0.6-0.1mm) are used for scanning, and the measured value is between 0 and 100. The lower the value, the smoother the surface of the coating film and the better the leveling.

    The factors that affect the leveling of powder coatings mainly include three aspects. One is leveling additives. Add appropriate leveling additives to the formula of powder coatings, such as GL588 of Nanhai Company, H98 of Leith Company, and of Worlee-chemie Company. PV88, etc., when the powder coating is melted, these additives can quickly reduce the surface tension of the coating, promote the rapid flow of the coating before curing and film formation, and eliminate or reduce surface defects such as orange peel, brush marks, ripples, and shrinkage craters; the second is the powder coating. The melt viscosity of the coating, for thermosetting powder coatings, in the melt flow process, along with the cross-linking curing reaction, the higher the temperature, the faster the curing reaction, the faster the system viscosity rises, the shorter the flow time, and the more restricted the leveling. .

    Therefore, the melt viscosity of the powder coating cannot accurately reflect the final leveling property of the coating film, and the influence of the baking process, heating rate, cross-linking curing temperature, etc. on the leveling property of the coating film must be considered at the same time; the third is the baking process. There is a heating process when powder coating is baked, and the heating rate has a considerable influence on the leveling of the coating. The trend of dynamic viscosity changes with temperature is basically the same, that is, the viscosity decreases with the increase of temperature at the beginning and reaches the minimum value, and then the viscosity increases with the increase of temperature, which is caused by the cross-linking reaction. More importantly, the faster the heating rate, the smaller the minimum value of the viscosity, and the higher the corresponding temperature, the better the curing of the coating film and the better the leveling of the coating film.

    The leveling of powder coatings is restricted by the structure and curing mechanism of leveling aids, film-forming resins. With appropriate leveling additives, resin system with low melt viscosity and matching curing process (UV curing), a coating film with excellent leveling performance can be obtained.

    Zhejiang Yuanzheng Technology

    Address: Room 1107, Building 1, Chenxin Building, Wuyang Sub-District, Deqing County, Zhejiang Province, China
    Tel: +86-572-8816606 8817606
    Mobile: +86-13967262286(Pan Xuewei)
    E-mail: sales@yzfm.com
    Website: http://m.isyv.cn

    Copyright(C)2022, Zhejiang Yuanzheng Technology Co., Ltd. All Rights Reserved. Supported by  ChemNet ChinaChemNet Toocle
    娇妻被别人带去杂交| 成人片黄网站色大片免费观看软件| 国产性生交xxxxx免费| 精品国产成人亚洲午夜福利| 精品一區二區久久久久久久網站| 人妻无码一区二区三区| 国产午夜A理论毛片| 亚洲欧美一区二区三区图片| 色综合久久综合网| 中国少妇BBWBBWHD| 这里只有精品视频自拍| 久久成人国产精品免费| 福利在线免费视频| 少妇扒开毛茸茸的B自慰| 国产人成视频在线观看| 免费视频久久| 亚洲日韩欧美一区二区三区| 国产欧美亚洲精品第一页| 好紧好湿好黄的视频| 亚洲AV日韩综合一区二区三区| 精品国产免费观看一区| 亚洲AV无码片在线播放| 中文字幕啪啪| 伊人久久精品亚洲午夜| 中文字幕无码久久一区| 国产精品免费久久久久影院无码| 隔壁人妻偷人在线观看| 精品久久久久久无码中文野结衣| 波多野结衣中文字幕一区二区三区| 亚洲国产日本一区二区| 精品国产网站| 国产亚洲精品AA片在线爽| 亚洲系列中文字幕一区二区| 欧美综合区自拍亚洲综合绿色| 久久无码人妻一区二区三区午夜| 国产又粗又猛又黄又爽无遮挡| 熟妇人妻AV在线| 波多野结衣中文字幕久久| 九九视频免费在线观看| 亚洲中文精品一区二区| 裸体女人亚洲精品一区|