Process for preparing modified lignocellulose sulfonate graft copolymer

A technology of lignosulfonate and graft copolymers, which is applied in the field of preparation of modified lignosulfonate graft copolymers, can solve the problems of slow reaction speed and low grafting efficiency, and achieve the improvement of grafting efficiency , improve utilization and save cost

Active Publication Date: 2005-11-09
溧阳常大技术转移中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, graft copolymers have been successfully prepared with lignin and double bond monomers, but most of them are homogeneous reactions. There are two main categories, one is lignosulfonate and water-soluble acrylic monomers in the water phase Graft copolymerization reaction, such as Chinese patent CN1148051A "method for graft copolymerization of lignin"; the second is the reaction with other oil-soluble vinyl monomers in solvents such as dimethyl sulfoxide, such as Chinese patent CN1071436A "using lignin and ethylene The method of preparing graft copolymers based on monomers", and the grafting efficiency is not high
In addition, enzymatic hydrolysis-chemical methods are also used to prepare lignin-grafted double bond monomers, but this type of reaction is relatively slow

Method used

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  • Process for preparing modified lignocellulose sulfonate graft copolymer
  • Process for preparing modified lignocellulose sulfonate graft copolymer
  • Process for preparing modified lignocellulose sulfonate graft copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Modification of lignosulfonate by maleic anhydride

[0017] 100 g of purified lignosulfonate and 50 g of maleic anhydride were placed in a stainless steel sealed tank, mixed evenly, and then placed in an oil bath to heat up, react at a certain temperature for a certain period of time, take out the product after cooling, and soak it in acetone for 24 hours. , washed twice with acetone to remove unreacted maleic anhydride, and dried at 60°C in an oven to obtain maleic anhydride-modified lignin.

Embodiment 2

[0018] Example 2: Modification of lignosulfonate by acryloyl chloride

[0019] Dissolve 100 g of the purified lignosulfonate in 200 ml of dimethyl sulfoxide, add 30 ml of acryloyl chloride dropwise at room temperature, and after the reaction is completed, add triethylamine dropwise to neutralize the hydrochloric acid in the product, and then add ether The modified lignosulfonate was precipitated, centrifuged, and washed three times with absolute ethanol to remove triethylamine hydrochloride to obtain acryloyl chloride-modified lignin.

Embodiment 3

[0020] Example 3: Grafting reaction of maleic anhydride modified lignosulfonate with MMA and BA (molar ratio of lignosulfonate to monomer is 1:5) Components:

[0021] A. Water 40g

[0022] OP-10 0.65g

[0023] OS(40%) 0.6g

[0024] B. Acrylic acid (AA) 2g

[0025] Ammonia (26%) 0.2g

[0026] C. Methyl methacrylate (MMA) 40g

[0027] Butyl acrylate (BA) 48.5g

[0028] Tert-butyl hydroperoxide (THP) 0.5g

[0029] D. Maleic anhydride modified lignosulfonate 30% solution 60g

[0030] NaHSO 3 0.5g

[0031] E. Appropriate amount of water

[0032] Na 2 HPO 4 0.5g

[0033] Put component A into a 500ml three-necked bottle equipped with a stirring device and a dropping funnel, gradually add components B and C under stirring, and continue stirring for a period of time after adding to obtain a stable monomer emulsion. 10% of which is added to component E as a monomer emulsion for seeds.

[0034] Add the seed polymerizat...

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PUM

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Abstract

A modified lignin sulfonate graft copolymer is prepared through esterifying lignin by propenoyl chloride or acrylic acid or maleic anhdyride to obtain modifier lignin, an graft copolymerizing reaction between said modified lignin and perspex, acrylic acid, butyl acrylate, or substituted olefin in water by emulsion polymerizing method.

Description

technical field [0001] The invention relates to a compound preparation method, in particular to a preparation method of a modified lignosulfonate graft copolymer. Background technique [0002] In the study of lignin utilization, the use of grafting reaction between lignin and double bond monomers is one of the research directions. At present, graft copolymers have been successfully obtained by using lignin and double bond monomers, but most of them are homogeneous reactions, mainly in two categories, one is lignosulfonate and water-soluble acrylic monomers in water phase The second is the reaction with other oil-soluble vinyl monomers in solvents such as dimethyl sulfoxide, such as Chinese patent CN1071436A "using lignin and ethylene The method of preparing graft copolymer from base monomer", and the grafting efficiency is not high. In addition, enzymatic hydrolysis-chemical method is also used to prepare lignin-grafted double bond monomers, but the reaction speed of this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 储富强洪建国
Owner 溧阳常大技术转移中心有限公司
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