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印染海藻酸钠
a．印花浆
海藻酸钠用作经纱上浆、整理浆、印花浆等已有悠久的历史，但主要用在印花浆方面。海藻酸钠用作活性染 料色浆，具有独特性能。纤维和活性染料进行化学反应，将染料固定在纤维上，在染色过程中所用印花浆应不干扰或参与化学反应键合。若色浆参与反应，就会固定在纤维上，这就造成染过的纤维手感发硬，变脆、色泽不好。当使用海藻酸钠作印花浆时，既不影响活性染料与纤维的染色过程，同时印出花纹清晰、鲜艳、给色量高，手感好。不仅适合于棉布印色，也适用于羊毛、丝、合成纤维的印花。
中等粘度和低粘度的海藻酸钠都适用于从筛网式印花到滚筒式印花色浆的要求。实际上用低粘度的海藻酸钠制备印花浆较稳定，这使制备较高含量的印花浆成为可能，这种印花浆可导致在干燥过程中产生致密的膜，使着色率增加。
b．人造纤维
海藻酸钠与石棉短纤维混合，经过醋酸钙溶液凝固处理，可防止石棉纤维飞扬，影响人身健康。
海藻酸钠质量指标
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工业级(农业部SC/T3401-1985) |
食品级(GB1976-80) |
液相食品添加剂(Q/02MYZ009-2003) |
美国食品化学药典(FCCIV) |
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粒度 |
30目100％通过或根据合同要求 |
根据合同要求 |
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粘度(mpa.s) |
根据合同要求 |
≥150或按合同要求 |
符合客户要求 |
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水分(％) |
≤15 |
≤15 |
≤15 |
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PH |
6.0-7.5 |
6.0-8.0 |
6.0-8.0 |
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含钙量％ |
≤0.3 |
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/ |
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硫酸灰份％ |
20.0-24.0 |
30-37 |
30-37 |
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水不溶物％ |
≤0.6 |
≤3.0 |
≤0.6 |
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透明度(0.5％溶液)cm |
≥3 |
合乎规定 |
合乎规定 |
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重金属％ |
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≤0.004 |
≤0.004 |
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砷盐％ |
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≤0.0002 |
≤0.0002 |
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铅％ |
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≤0.0004 |
≤0.0004 |
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游离氯 |
不得检出 |
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/ |
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凝胶强度 |
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低强度≤200；高强度≥500 |
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Sodium alginate series includes industrial dye-printing grade sodium alginate and purpose-made dye-printing sodium alginate.
a. Printing paste
Sodium alginate has already been used in warp sizing, trimming paste and printing paste for a long time in history while mainly in the printing paste. It has specific function when used as active paste and color paste. Fibre has chemical reactions with active dyestuff to fix it onto the fibre. In dyeing process, the printing paste used should not disturb or join in the chemical reactive linkage otherwise it will be fixed onto the fibre, which makes the dyed fibre feel stiff and fragile and the color is not good. While when sodium alginate acts as the printing paste, it will not affect the dyeing process of active dyestuff and fibre nor produce the defects listed above. Thus it is not only fit for chandar ink but also applying to wool, silk and synthetic fibre's printings.
Middle and low-viscosity sodium alginates are all fit for the paste requirements from sieve-style printing to barrel-type printing. Actually, printing made from low-viscosity sodium alginates is more stable, which makes high-content printing paste possible. This kind of printing paste can produce compact film in drying process so as to increase the coloration rate.
b.Synthetic fiber
Mixed with asbestine short fibre and solidified by lime acetate, sodium alginate can prevent lime acetate rising and affecting human health
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