<section data-role="outer" class="article135" label="edit by 135editor"><section data-role="paragraph" class="_135editor"><p style="margin-bottom: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgba(0, 0, 0, 0.9); font-size: 17px; letter-spacing: 0.544px; text-align: justify; line-height: 2em; font-family: system-ui, -apple-system, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; overflow-wrap: break-word !important;" align="justify"><span style="font-size: 14px; color: #000000;font-family: 微软雅黑, &quot;Microsoft YaHei&quot;;"><strong style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; line-height: 1.6; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; line-height: 1.6; overflow-wrap: break-word !important;"></span></strong></span></p><section class="_135editor" data-tools="135编辑器" data-id="126874"><section style="margin: 10px auto;"><section style="display: flex;justify-content: flex-start;"><section style="display: flex;justify-content: flex-start;align-items: center;"><section style="flex-shrink: 0;"><section style="width: 20px; height: 20px; border-radius: 100%; background: linear-gradient(to right bottom, rgb(255, 220, 208), rgb(255, 230, 189)); overflow: hidden;"></section></section><section style="margin: 20px 0 0 -12px;"><section style="font-size: 16px; color: rgb(158, 225, 229); text-align: center; padding: 0px 15px 4px 0px;"><p style="line-height:2em"><span style="font-size: 14px; color: #000000;font-family: 微软雅黑, &quot;Microsoft YaHei&quot;;"><strong class="135brush" data-brushtype="text">何为pH敏感性？</strong></span></p></section></section></section></section><section style="background-color: rgb(243, 251, 252); padding: 10px;"><section data-autoskip="1" class="135brush" style="text-align: justify; line-height: 1.75em; letter-spacing: 1.5px; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255); padding: 15px;"><p style="line-height:2em"><span style="color: rgb(0, 0, 0); font-family: 微软雅黑, &quot;Microsoft YaHei&quot;;">分散染料的品种多、色谱广，对pH的敏感性很不一样，不同pH值的染液常会导致不同的染色结果，影响得色深浅，严重的甚至产生色变。在弱酸性介质（pH4.5～5.5）中，分散染料处于最稳定状态。<br></span></p><p><br></p><p style="line-height:2em"><span style="color: rgb(0, 0, 0); font-family: 微软雅黑, &quot;Microsoft YaHei&quot;;">商品染料溶液的pH值不尽相同，有些是中性，也有些带微碱性。染色前，都要用醋酸调节至规定的pH值。染色过程中，有时染液的pH值会逐渐升高，必要时可加蚁酸和硫酸铵，使染液始终保持弱酸性状态。</span></p></section></section></section></section><section class="_135editor" data-tools="135编辑器" data-id="126874"><section style="margin: 10px auto;"><section style="display: flex;justify-content: flex-start;"><section style="display: flex;justify-content: flex-start;align-items: center;"><section style="flex-shrink: 0;"><section style="width: 20px; height: 20px; border-radius: 100%; background: linear-gradient(to right bottom, rgb(255, 220, 208), rgb(255, 230, 189)); overflow: hidden;"></section></section><section style="margin: 20px 0 0 -12px;"><section style="font-size: 16px; color: rgb(158, 225, 229); text-align: center; padding: 0px 15px 4px 0px;"><p style="line-height:2em"><span style="font-size: 14px; color: #000000;font-family: 微软雅黑, &quot;Microsoft YaHei&quot;;"><strong class="135brush" data-brushtype="text">染料结构对pH敏感性的影响：</strong></span></p></section></section></section></section><section style="background-color: rgb(243, 251, 252); padding: 10px;"><section data-autoskip="1" class="135brush" style="text-align: justify; line-height: 1.75em; letter-spacing: 1.5px; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255); padding: 15px;"><p style="line-height:2em"><span style="color: rgb(0, 0, 0); font-family: 微软雅黑, &quot;Microsoft YaHei&quot;;">偶氮结构的分散染料有些对碱十分敏感，也不耐还原作用。带酯基、氰基或酰胺基的分散染料，多数会受碱水解作用，影响正常的色光。也有些品种即使在中性或弱碱性条件下高温染色，无色变现象，可以和直接染料同浴染色，或与活性染料同浴轧染。</span></p><p><br></p><p style="line-height:2em"><span style="color: rgb(0, 0, 0); font-family: 微软雅黑, &quot;Microsoft YaHei&quot;;">印花色浆在需要用分散染料和活性染料同浆印花时，只能选用对碱稳定的染料品种，方可不受小苏打或纯碱的作用影响色光，在拼色时尤其要注意。在更换染料品种前必须通过试验，并查明该染料对pH值稳定的范围。</span></p></section></section></section></section></section></section>