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影响荧光增白剂增白的要素


网址:http://www.jilinghuagong.com  时间:2019-03-05 10:28:50

1.原浆白度
1. Whiteness of raw pulp
纸浆的白度越高,增白剂的增白效果越好。只要在高白度的纸浆中运用增白剂才较爲经济合理。例如原浆的白度在70%/SO以下时,白度越低,增白效果越差。增白剂用量相反时,白度的增值很小。当原浆白度在80%ISO时较容易增白,运用4~6kg/t纸液体增白剂NT一3或NT一3一B白度可到达9o%~95%ISO。假如受制浆漂白工艺设备条件的制约,原浆白度只能在75%ISO以下,建议运用NT一8,但必需使pH在7以上,方能有较理想的增白效果。假如是脱墨回收纸,思索到一局部废纸中已运用过增白剂,靠添加普通增白剂要分明进步成品纸的白度是困难的,可选择试用特殊增白剂F1Nw,由于价钱较昂贵,要慎重选择,NT一3一B型也是可选择的产品。
The brighter the pulp, the better the brightening effect of brightener. Only when whitening agent is used in high brightness pulp can it be more economical and reasonable. For example, when the whiteness of raw pulp is below 70%/SO, the lower the whiteness, the worse the whitening effect. When the dosage of brightener is opposite, the increment of whiteness is very small. When the whiteness of raw pulp is 80% ISO, it is easier to whiten. The whiteness of liquid brightener NT-3 or NT-3-B can reach 9o%-95% ISO with 4-6kg/t paper. If the whiteness of raw pulp can only be below 75% ISO due to the restriction of bleaching process and equipment, NT-8 is recommended, but the pH must be above 7 in order to achieve better whitening effect. If it is deinked recycled paper, considering that some waste paper has used whitening agent, it is difficult to improve the whiteness of finished paper by adding ordinary whitening agent. Special whitening agent F1Nw can be selected for trial. Because of its high price, NT-131B is also an optional product.
2.增自剂的用量
2. The dosage of self-increasing agent
在一定的工艺条件、原浆白度条件下,增白剂对绝干浆料的用量是非常重要的。首先是随着增白剂用量的添加,白度迅速进步,并到达某一个峰值。峰值后随着增白剂用量添加,白度峰值变化很小,甚至下降。
Under certain technological conditions and whiteness of raw pulp, whitening agent is very important to the dosage of dry pulp. First, with the addition of whitening agent, whiteness improves rapidly and reaches a certain peak. After the peak value, the whiteness peak value changed little or even decreased with the addition of whitening agent.
当增白剂用量从0进步到0.4%时,白度呈线性添加;但当用量从0.4%添加到0.8%时,白度增值添加很小。而此时增白剂的本钱则添加了1倍!消费中增白剂用量到达12~16kg/t纸,而白度仍然变化不大,就是这个道理。超越了发生峰值的用量,再多加增白剂用量,对进步白度没有意义。当然在某一机台、特定的纸种、特定的工艺条件下,到达白度峰值的增白剂用量是多少,或许说增白剂的经济合理用量是多少,各厂是不一样的,要做一些研究任务。我们引荐的经济用量,NT一3、NT一3一B普通爲4~8kg/t纸,NT一8普通爲3~6kg/t纸。
When the dosage of whitening agent increases from 0% to 0.4%, the whiteness increases linearly, but when the dosage increases from 0.4% to 0.8%, the whiteness increases little. At this time, the cost of whitening agent was doubled! The consumption of whitening agent reached 12-16kg/t paper, whiteness still remained unchanged, which is the reason. It is not meaningful to improve whiteness if the dosage of whitening agent exceeds the peak value. Of course, in a certain machine, specific paper, specific process conditions, the amount of whitening agent to reach the peak whiteness is how much, perhaps the economic and reasonable amount of whitening agent is how many, the factory is different, to do some research tasks. The recommended economic consumption of NT-3 and NT-3-B is 4-8 kg/t paper and NT-8 is 3-6 kg/t paper.
3.pH值和明矾用量
3. pH value and alum dosage
就普通状况而言,增白剂在pH7.0~9.0时能获得更好的增白效果,尤其是NT一8,建议在pH6.5以上运用,如pH值在6.5以下,建议运用NT一3,因NT一8爲二磺酸型,虽然增白强度比NT一3高,但耐酸性较差。抄纸零碎中明矾的参加对增白效果有一定影响,首先是随着明矾的参加,零碎的pH下降;其次明矾用量增多,阳电性加强,对增白剂的搅扰加强;第三是明矾含有较多的铁离子,而增白剂对铁、铜离子忍受性较差。
In general, whitening agent can get better whitening effect at pH 7.0-9.0, especially NT-8. It is suggested that NT-3 should be used at pH 6.5 or above. If the pH value is below 6.5, NT-3 should be used because NT-8 is disulfonic acid type. Although its whitening strength is higher than NT-3, its acid resistance is poor. The addition of alum in paper-making fragments has a certain effect on the whitening effect. Firstly, with the participation of alum, the fragmentary pH decreases; secondly, the dosage of alum increases, the positive electricity strengthens, and the disturbance to whitening agent strengthens; thirdly, alum contains more iron ions, while whitening agent has poor tolerance to iron and copper ions.
荧光增白剂厂家
4.填料对增白剂的影响
4. The influence of filler on whitening agent
随着填料用量的添加,纸张的增白效果也遭到一定的影响。当增白剂用量W爲0.4%,填料用量从W=10%进步到W=20%时,白度增值下降2个单位。不同的填料对增白剂的影响不同,例如Ti0,的影响比高岭土或白垩要大些。另一点很重要,消费不同白度的纸种还应选择不同品级的填料,例如消费9o%ISO双胶纸就不宜选用白度83%ISO的滑石粉。
With the addition of filler, the whitening effect of paper is also affected. When the dosage of whitening agent W is 0.4% and filler W = 10% to W = 20%, the whiteness increment decreases by 2 units. Different fillers have different effects on whitening agents, such as Ti0, which has greater effects than kaolin or chalk. Another important point is that different grades of fillers should be selected for paper with different whiteness. For example, talc powder with 83% ISO whiteness should not be used for 9o% ISO double adhesive paper.
5.配浆和损纸对增白剂增白效果的影响
5. The influence of pulping and paper loss on whitening effect of whitening agent
不同白度要求的纸种选择适宜的浆料配比非常重要。消费高白度的纸种不宜选用含木素的机械浆,如SWG、TMP、C3"MP等。由于木素对增白效果影响非常分明。含有此类浆料的纸种难以到达高白度,不同漂白水平的纤维对增白剂有不同的反响性。从经济效益动身,损纸的回用量是必不可少的,损纸的回用对增白效果有负面影响,这是由于损纸中有阳离子性化学品存在,搅扰了增白剂的增白效果。因而消费进程中应该保证浆料配比波动,损纸要波动地回抄,这样才干保证白度和色彩的波动。
It is very important to select suitable pulp proportion for paper with different whiteness requirements. The mechanical pulp containing lignin, such as SWG, TMP, C3 "MP, etc., should not be used for the consumption of high whiteness paper. Because the effect of lignin on whitening is very clear. It is difficult to achieve high whiteness for paper containing this kind of pulp. Fibers with different bleaching levels have different reactivity to whitening agents. Starting from the economic benefits, the recycling amount of damaged paper is indispensable. The recycling of damaged paper has a negative impact on the whitening effect. This is due to the presence of cationic chemicals in damaged paper, which disturbs the whitening effect of whitening agent. Therefore, in the process of consumption, we should ensure the fluctuation of pulp proportion and the fluctuation of paper loss, so as to ensure the fluctuation of whiteness and color.
6.阳离子化学品对增白剂增白效果的影响
6. Effect of Cationic Chemicals on Whitening Effect of Whitener
随着纸机车速进步和质量要求添加,阳离子性化学品在造纸中的使用非常普遍,如阳离子聚丙烯酰胺等。一切的阳离子性化学品都对增白剂增白效果有负面影响。假如处置不当即便大批的阳离子化学品都会严重降低纸张的白度。化学品的阳电性越强,这种影响越大,如阳离子淀粉的取代度越高或聚丙烯酰胺的电荷密度越高,对增白效果的搅扰越大。
With the improvement of speed and quality requirement of paper locomotive, cationic chemicals are widely used in papermaking, such as cationic polyacrylamide. All cationic chemicals have a negative impact on the whitening effect of whitening agents. If improperly handled, even large quantities of cationic chemicals can seriously reduce the whiteness of paper. The stronger the positive electricity of the chemical is, the greater the influence is. For example, the higher the degree of substitution of cationic starch or the higher the charge density of polyacrylamide, the greater the disturbance to whitening effect.
在高白度初级文明用纸中,施胶剂、助留剂、增白剂都是不可少的添加剂,如何控制它们的负面效应,控制它们之间的相关搅扰非常重要。普通的措施是把增白剂和阳离子化学品辨别在不同的部位参加,或坚持它的间隔。特别重要的是参加增白剂前配料中最好没有任何阳离子性添加物。因而在造纸化学品的使用中细心选择各种物料的添加点非常重要。
Sizing agent, retention aid and whitening agent are indispensable additives in high whiteness primary civilized paper. How to control their negative effects and the perturbation between them is very important. Common measures are to distinguish whitening agents from cationic chemicals in different parts or to adhere to their intervals. Especially important is that there is no cationic additive in the ingredients before whitening agent is added. Therefore, it is very important to carefully select the adding points of various materials in the use of paper chemicals.
本文由山东吉凌化工有限公司http://www.jilinghuagong.com整理,想了解更多荧光增白剂厂家,感兴趣的朋友可以关注我们,为你提供优质服务。
This article is organized by Shandong Jiling Chemical Co., Ltd. http://www.jilinghuagong.com. I want to know more manufacturers of fluorescent brighteners. Interested friends can pay attention to us and provide you with high-quality services.

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