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class="xypg-detail-info-bar"> <div class="detail-info-time"><i class="icon-font icon-shijian"></i>2021-09-25 09:21:41</div> <div class="detail-info-numbers"><i class="icon-font icon-chakan"></i><script src="http://www.afterlifeshow.com/source/include/browse.php?model=news&id=513"></script>次</div> </div> <div class="xypg-detail-con"><p style="text-indent: 2em;">石膏粉我们都见过，那您知道该怎样区分它的优劣吗？下面让<a href="http://www.afterlifeshow.com/" target="_self"><a href='http://www.afterlifeshow.com/' target='_blank' class='key_tag'><font><strong>石膏粉生产线厂家</strong></font></a></a>教您该怎样辨别吧！</p><p style="text-indent: 2em;">1、从外形上分辨</p><p style="text-indent: 2em;">根据外型上观查和触感可分析判断嵌缝石膏品质的好坏。便是看嵌缝石膏的外表色调，触感便是拿手搓一搓嵌缝石膏的糙细水平(粒度)。</p><p style="text-indent: 2em;">外型上看，细度高的嵌缝石膏粒度筛网目数高，性价比高，价钱较高;而发灰变黑，里边有灰黑色残渣的嵌缝石膏品质较弱。拿手的食指和无名指捏弄嵌缝石膏,触感发沙不光滑的嵌缝石膏粒度糙，品质较弱，价钱较低;而触感细致的石音粉表明粒度细，品质不错，价钱也会较高。</p><p style="text-indent: 2em;">2、测量羧基成分</p><p style="text-indent: 2em;">嵌缝石膏是一种结晶体混合物质，在其中会带有生石膏，半水熟石膏和无水石膏(过烧石膏)。在炮制历程中欠火半生不熟会发生生石膏,或是上火，炮制時间太长导致粗晶会出現无水石膏，这种都是危害熟石膏的凝固時间,危害生产加工的常规应用。有时候因为嵌缝石膏置放的时间太长返潮,也会影响到正常的应用。依据工作经验和材料详细介绍,根据测量羧基的成分，可分辨嵌缝石膏品质的优劣。一般达标的嵌缝石膏羧基的占比在4.5?5.5%中间若嵌缝石膏的羧基成分远小于此指标值,则表明嵌缝石膏粗晶,注模时凝固的时间过长乃至不凝结;若嵌缝石膏的羧基成分远超此指标值，则表明嵌缝石膏欠火或是返潮,注模时凝固时间较短。之上二种情形的嵌缝石膏都不过关,在生产加工中无法应用。</p><p style="text-indent: 2em;">检验嵌缝石膏羧基成分的办法是：准确称量4(TC烘干处理后制冷至室内温度的样品品质G(—般为2?5g),置放于恒重的铂金坩埚(或瓷坩埚)中，准确称量其品质为G1;在230±5°C下烧灼2h，取下移进空气干燥器内，制冷至常温后称量其品质为G2，则其羧基百分之成分为(Gt—G2)/GX100%。</p><p style="text-align:center"><img src="http://cdn.myxypt.com/62bd608b/21/09/a4ceb6e4d4ab94b768aecea3aee401a5e1a848d5.jpg" width="200" height="150" border="0" vspace="0" title="石膏粉生产线厂家" alt="石膏粉生产线厂家" style="width: 200px; height: 150px;"/></p><p style="text-indent: 2em;">3、测量嵌缝石膏的凝固時间</p><p style="text-indent: 2em;">凝固時间包含初凝時间和终凝時间。嵌缝石膏凝固的时间的技术标准是：在规范砂浆稠度下，一般初凝時间不小于6min,终凝時间不超25min。适合的凝固时间嵌缝石膏在生产加工中常规运用的先决条件和必要性的标准。初凝時间过短或终凝時间太长都不适合。假如在应用中初凝時间过短，低于6min,则证实嵌缝石膏沒有炒过半生不熟，或返潮內部带有生石裔，危害注模实际操作,主要表现为生产制造中注桶，耽搁生产制造;若终凝時间过长，远高于25tnin,则表明熟石膏在炮制时粗晶，里边带有过烧石膏，主要表现为注模的时候容易跑浆,乃至熟石膏浆不凝结，危害生产制造。</p><p style="text-indent: 2em;">这2种情形的嵌缝石膏在生产制造上都不可以应用。故根据凝固的时间的测量可判断嵌缝石膏品质的好坏或是决策该嵌缝石膏在生产加工中能不能应用。</p><p style="text-indent: 2em;">4、简单测定法为</p><p style="text-indent: 2em;">1）按生产制造的膏水占比称量100ml水所需的嵌缝石膏试件，把水引入500ml器皿中，将样品在lmin内匀称地撒进水里，并静放30s,迅速拌和30s，并把熟石膏料浆马上倒人置放在玻璃上的钢管内，接着迟缓竖直往上提到空调铜管20mm,使熟石膏料浆铺平成厚约5mm的试饼。</p><p style="text-indent: 2em;">2）用直径大约5nun的玻璃棒划割试饼，间距30s划一次,每一次划后拿布将玻璃棒擦干净。当刮痕两侧的料浆恰好不会再并拢时即是初凝。以试件资金投入水里逐渐至初凝的间隔时间便是初凝時间；</p><p style="text-indent: 2em;">3）在测量初凝后的试饼上放拇指以约50N的力持续轻按，间距15s—次，当轻按至划痕边沿沒有水分发生时即是终凝。以试件投入水里逐渐至终凝的间隔时间便是终凝時间</p><p style="text-indent: 2em;">依据检验效果与产品质量标准或与一切正常生产里时的嵌缝石膏的凝固時间标值开展比照，就可以判断嵌缝石膏品质的好坏和决策其在生产加工中能不能应用。</p><p style="text-align:center"><img src="http://cdn.myxypt.com/62bd608b/21/08/90f309ae5a3fc29814cc6e13d252e9b7fcf12b66.jpg" width="200" height="120" border="0" vspace="0" title="石膏粉生产线厂家" alt="石膏粉生产线厂家" style="width: 200px; height: 120px;"/></p><p style="text-indent: 2em;">05、测量试饼直徑</p><p style="text-indent: 2em;">按生产制造中熟石膏和水的占比，可仔细观察和准确测量试饼的孔径尺寸(流通性),来分辨嵌缝石膏品质的好坏和决策其在生产加工中能不能应用。试饼直徑的尺寸与水流量，膏水占比及其嵌缝石膏的品质等原因相关。试验检验时要固定不动水流量的尺寸,所运用的工具和实验方法应一致。在生产熟石膏和水的百分比下，若以制造中常规运用的达标嵌缝石膏的试饼直徑为D，待检嵌缝石膏试饼直徑为d。假如d远远地低于D，乃至不流动性铺平，则表明嵌缝石膏品质不太好,沒有炒过半生不熟，或返潮內部带有生石膏，危害注模实际操作乃至无法应用;假如d远远地超过D,料浆很稀流通性强，则表明嵌缝石膏粗晶，注模时凝固的时间过长以致不凝结，也没法应用。用此方式还可以区别一般P嵌缝石膏和高韧性a嵌缝石膏。在相同的膏水占比下,若料浆流通性强，试饼直徑大，则说明是a嵌缝石膏;相反，若料浆流通性差，乃至不流动性,试饼直徑小,则说明是c嵌缝石膏。</p><p style="text-indent: 2em;">06、生产制造中试注</p><p style="text-indent: 2em;">按生产制造中熟石膏和水的占比，保证所运用的器材，实际操作工作人员，机器设备和技术方式一致，挑选一个中小型胎型母?？股圃炷Ｊ降氖宰?，与制造中常规运用的达标嵌缝石膏的实体模型浇筑全过程开展比照。若被测石裔粉凝固時间一切正常有效，实际操作顺利不注桶，则表明该嵌缝石膏是符合标准的嵌缝石膏;若被测嵌缝石膏凝固時间异常，凝固時间过短注桶，或是凝固的时间过长乃至不凝结，那样的嵌缝石膏不过关，生产制造中一定不可以应用。</p><p><br/></p></div> <div 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