A kind of darkened lignin and its application in the inner layer paper of the outer bag of the fruit breeding cover
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A lignin and inner layer technology, applied in the field of papermaking, can solve the problems of large gaps and affecting the opacity of paper, and achieve the effect of low cost, low price, non-toxic, and wide sources
Active Publication Date: 2020-11-03
NANJING TECH UNIV
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Problems solved by technology
However, most industrial lignin is brownish-yellow or light brown, which is quite different from the black color of carbon black. Using lignin that has not been darkened and modified will affect the opacity of the paper
Method used
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Embodiment 1
[0048]1), at room temperature, 150g alkali lignin ( figure 1 a) be dissolved in 3000mL pH and be in the sodium hydroxide solution of 13;
[0049] 2), stirring the alkali lignin solution obtained in step 1) at room temperature to fully dissolve it;
[0050] 3), add 30g ferric chloride in the alkali lignin solution obtained in step 2);
[0051] 4), the solution obtained in step 3) is subjected to solid-liquid separation;
[0052] 5), the solid obtained in step 4) is washed to neutrality, and dried, and the solid obtained is the darkened lignin ( figure 1 b).
Embodiment 2
[0054] 1), at room temperature, dissolve 150g of alkali lignin in 3000mL of sodium hydroxide solution whose pH is 13;
[0055] 2), stirring the alkali lignin solution obtained in step 1) at room temperature to fully dissolve it;
[0056] 3), add 50g ferric chloride in the alkali lignin solution obtained in step 2);
[0057] 4), the solution obtained in step 3) is subjected to solid-liquid separation;
[0058] 5), washing the solid obtained in step 4) to neutrality, and drying, and the obtained solid is darkened lignin.
Embodiment 3
[0060] 1), at room temperature, dissolve 150g of alkali lignin in 3000mL of sodium hydroxide solution whose pH is 13;
[0061] 2), stirring the alkali lignin solution obtained in step 1) at room temperature to fully dissolve it;
[0062] 3), add 15g ferric chloride in the alkali lignin solution obtained in step 2);
[0063] 4), the solution obtained in step 3) is subjected to solid-liquid separation;
[0064] 5), washing the solid obtained in step 4) to neutrality, and drying, and the obtained solid is darkened lignin.
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Abstract
The invention discloses deep-color lignin and application thereof to inner-layer paper of an outer bag of a fruit cultivating sleeve. A preparation method of the deep-color lignin comprises the following steps: (1) mixing ferric salt and lignin in an alkaline solution; and (2) carrying out solid-liquid separation on the product obtained in the step (1), washing the obtained solid to be neutral, and drying to obtain the deep-color lignin. The method has the beneficial effects that (1) the lignin which is wide in source, low in price and non-toxic is used as a substitute material of carbon black, so that the economic cost is saved; (2) the dark lignin is used for replacing the carbon black, the quantification, Cobb and wet tensile strength and light absorption of the paper are basically notinfluenced, the cost is reduced, and meanwhile, the ultraviolet aging resistance of the inner-layer paper of the outer bag of the fruit cultivating sleeve is improved, so that the inner-layer paper ofthe outer bag of the fruit cultivating sleeve has more durable stability; and (3) pulping black liquor is used as a raw material, so that the cost is lower, and the problem of environmental pollutioncaused by the pulping black liquor is solved.
Description
technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a darkened lignin and its application in the inner layer paper of the outer bag of a fruit-raising cover. Background technique [0002] The inner layer paper of the outer bag of the fruit bag is a special agricultural paper, which is often used for fruit bagging of various fruits. It is generally composed of an inner bag and an outer bag. The inner layer is black and requires shading, and the outer layer is light yellow or other light colors. , to reflect as much light as possible. The black color of the inner paper of the fruit bag is made by the pulp dyeing process of carbon black. Since the paper of the fruit bag needs to be used in the field for more than 3 months, the water resistance, wet strength and light shading of the paper are not affected. Generally, the outer paper has high wet strength and high water resistance, and the inner paper has high light ab...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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