Manufacturing method of high branching degree acrylamide graft copolymer taking amylopectin as framework
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A graft copolymer, amylopectin technology, applied in the field of highly branched water-soluble polymers, to achieve excellent water retention effect
Inactive Publication Date: 2013-01-16
广州睿宜精测环保科技有限公司
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The prior art does not disclose the selection of urea as a structural regulator, by grafting water-soluble vinyl monomers (such as acrylamide) on pullulan, and then adding ketone carbonyl-containing ethylenical
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Embodiment 1
[0093] (1) Under stirring, add 330 kg of water, 30 kg of pullulan, 50 kg of acrylamide, 1 kg of urea, 1 kg of ammonium persulfate, 0.5 kg of allyloxypolyethylene oxide (12 ) nonylphenyl ether ammonium sulfate, 0.23 kg of acetoacetate ethyl methacrylate (AAEM), 0.12 kg of adipic acid dihydrazide, 0.2 kg of 5% sodium sulfite solution was added during stirring, and mixed at room temperature and normal pressure for 1.5 hours;
[0094] (2) The above-mentioned slurry is transported to a drum dryer through a pipeline, and a highly branched pullulan acrylamide copolymer (referred to as copolymer 1) is obtained through slurry distribution, reaction, and drying.
[0095] (3) Measure the product with NDJ-1 viscometer, the viscosity of 2% aqueous solution is 18000cp.
[0097] Characterization of mild cross-linking: due to the relatively co...
reference example 1
[0099] Example 1 was repeated except that the cross-linker adipic dihydrazide was not used. Product viscosity: 5500cp. The viscosity of the product of Comparative Example 1 is about 1 / 3 of the viscosity of the product in Example 1, indicating that Reference Example 1 does not crosslink, but Example 1 crosslinks because of the crosslinking agent, because it is still soluble in water, so it is judged to be slightly cross-linked.
Embodiment 2-6
[0100] Embodiment 2-6: The basic operation process is the same as that of Embodiment 1, and the ratio of materials is shown in Table 1 below (the amount of components is in kg).
[0101]
[0102]
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Abstract
The invention relates to a manufacturing method of high branching degree acrylamide graft copolymer taking amylopectin as the framework. The manufacturing method comprises the following steps: A) carrying out free radical grafting reaction with amylopectin, water-soluble vinyl monomers (such as acrylamide), optional carbamide and optional reaction type surfactant; and B) adding cross-linking monomer and cross-linking agent that can react with the cross-linking monomer to carry out modification reaction for obtaining wet slurry, then dry up the slurry optionally, so that high branching degree and slightly cross-linked water-soluble graft polymer (or copolymer) is prepared. At 25 DEG C, the rotary viscosity the aqueous solution of which the concentration is 2wt% is generally within the range of 2000 to 70,000 mPa.s, wherein the aqueous solution is made of water. The graft polymer is used as biomedical material, water absorbing material, water-based ink coating, polymer additives, separation film material or photosensitive material.
Description
technical field [0001] The invention relates to a method for a high degree of branching water-soluble polymer produced by grafting and copolymerizing pullulan and acrylamide. Specifically, the water-soluble branched copolymer obtained by free radical polymerization of pullulan and acrylamide has the anti-aging properties of pullulan, freeze-thaw stability, thickening effect, high swelling and water absorption, etc., and The reinforcement, adhesion, flocculation, temperature resistance, salt resistance, shear resistance and other properties of polyacrylamide, the formed highly branched copolymer has remarkable water retention, thickening, film forming, low viscosity, high activity and other properties, It is widely used in many technical fields such as papermaking, paint, ink, construction, metallurgy, pharmacy, textile, water treatment, chemical industry, sugar refining, ceramics and printing and dyeing. [0002] The pullulan involved in the invention is a water-based branche...
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