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Modified sizing starch, surface sizing liquid, preparation method of modified sizing starch, and application of surface sizing liquid

A technology of sizing starch and surface sizing, which is applied in textiles and papermaking, adding water repellents, without pigment coating, etc., can solve the problems of complicated preparation process, non-degradable raw materials, and high preparation cost, and improve water resistance. , The effect of reducing Cobb value and saving workshop cost

Active Publication Date: 2020-07-03
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a modified sizing starch, surface sizing solution and its preparation method and application

Method used

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  • Modified sizing starch, surface sizing liquid, preparation method of modified sizing starch, and application of surface sizing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] 1. Preparation of modified sizing starch

[0081] Step (1): Under the condition of stirring, add 30g of pulping waste liquid (15g in dry weight) with a solid content of 50% into the glass reactor, 70g of water and 28g of tapioca starch, mix well, and mix Start to raise the temperature, and gelatinize for 1.5 hours at a temperature of 75° C. to obtain material A.

[0082] Step (2): After the gelatinization is completed, under the condition of stirring, mix the prepared material A with 0.08g of ferrous sulfide, adjust the pH of the system to 4.5 with a mass fraction of 36% hydrochloric acid, the addition of hydrochloric acid 14g; then add 5g of aqueous hydrogen peroxide solution with a mass fraction of 28% dropwise to the system for 30 minutes, after the dropwise addition, keep warm at 75-78°C for 2 hours to obtain material B.

[0083] Step (3): Under the condition of stirring, mix the prepared material B with 0.8g of sodium azide and 3g of water evenly, after mixing, co...

Embodiment 2

[0087] 1. Preparation of modified sizing starch

[0088]Step (1): Under stirring conditions, add 25g of pulping waste liquid with a solid content of 50% (12.5g in dry weight), 50g of water and 20g of cornstarch into the glass reactor, mix well, and mix After that, start to raise the temperature, and gelatinize at 80°C for 0.75h to obtain material A.

[0089] Step (2): After the gelatinization is completed, under the condition of stirring, mix the prepared material A and 0.06g of chromium monoxide evenly, and adjust the pH of the system to 5 with a mass fraction of 36% hydrochloric acid. 10.6g; add 4g of aqueous hydrogen peroxide solution with a mass fraction of 28% dropwise to the system for 20min, after the dropwise addition, keep the temperature at 78-81°C for 1.5h to obtain the material b.

[0090] Step (3): Under the condition of stirring, mix the prepared material B with 0.6g of methanol and 32g of water evenly, after mixing, cool down to room temperature and then disch...

Embodiment 3

[0094] 1. Preparation of modified sizing starch

[0095] Step (1): Under the condition of stirring, add 18g of pulping waste liquid (9g in dry weight) with a solid content of 50% to the glass reactor, 50g of water and 12g of potato starch, mix well, and mix Start to raise the temperature, and gelatinize for 1 hour at a temperature of 80° C. to obtain material A.

[0096] Step (2): After the gelatinization is completed, under the condition of stirring, mix the prepared material A with 0.04 g of vanadium dichloride evenly, adjust the pH of the system to 4.7 with a mass fraction of 36% hydrochloric acid, and add the hydrochloric acid The amount is 8g; then 2.5g of aqueous hydrogen peroxide solution with a mass fraction of 28% is added dropwise to the system for 10 minutes. b.

[0097] Step (3): Under the condition of stirring, mix the prepared material B with 0.3g of salicylic acid and 146g of water evenly, after mixing, it is cooled to room temperature and discharged to obtain...

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Abstract

The invention discloses a modified sizing starch, a surface sizing liquid, a preparation method of the modified sizing starch and an application of the surface sizing liquid. The preparation method ofthe modified sizing starch comprises the following steps: (1) sequentially mixing and gelatinizing a pulping waste liquid and starch to prepare a material A; (2) mixing the material A with a catalystand an aqueous hydrogen peroxide solution, and carrying out heat preservation to obtain a material B; (3) mixing the material B with a reducing agent to prepare the modified sizing starch. In the step (2), the catalyst is one or more of compounds containing Fe<2+>, Cr<2+>, V<2+>, Ti<3+>, Co<2+> and Cu<+>, the weight ratio of the dry weight of the pulping waste liquid to the aqueous hydrogen peroxide solution is 1:(0.04-1.6), and the mass fraction of the aqueous hydrogen peroxide solution is 24-35%. The prepared surface sizing liquid can effectively improve the water resistance of paper and reduce the Cobb value of the paper, the mechanical properties of the surface sizing solution are equivalent to those of an existing surface sizing liquid, and raw materials are degradable.

Description

technical field [0001] The invention specifically relates to a modified sizing starch, a surface sizing solution and a preparation method and application thereof. Background technique [0002] In recent years, the extraction and application of biomass resources has become the research focus of academic and industrial circles at home and abroad. It mainly refines and modifies agricultural, forestry and seafood waste, and transforms a large amount of wasted environmental pollutants into high value-added products. With the characteristics of wide source, low cost and biodegradability, it provides a new idea for replacing non-renewable resources and high-cost raw materials. Patent CN105018011B reports a method of using bagasse papermaking waste liquid concentrate to partially replace phenol to prepare a phenolic adhesive. A successful case of turning waste into treasure. How to apply these huge quantities of biomass resources to papermaking chemicals remains to be explored. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/14D21H19/34D21H21/16C08B31/18
CPCD21H19/14D21H19/34D21H21/16C08B31/18Y02W30/64
Inventor 施晓旦潘航金霞朝
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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