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Synthesis and Application of Water-borne Polyurethane Surface Sizing Agent

Author: JiangLiFeng
Tutor: DaiHongQi
School: Nanjing Forestry University
Course: Pulp and Paper Engineering
Keywords: Surface sizing agent Waterborne Polyurethane Epoxy resin Surface sizing
CLC: TS727.5
Type: Master's thesis
Year: 2010
Downloads: 141
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Abstract

\The contents and results of the study are as follows: 1 in the process of exploration of the synthesis process, the synthesis of epoxy-modified anionic waterborne polyurethane with dimethylol propionic acid (DMPA) as the hydrophilic chain extender; select an epoxy value of 0.43 bisphenol A type E-44 epoxy resin-modified; epoxy resin E-44 was added by the graft copolymerization, first join the epoxy E-44 added to the the DMPA reaction after a certain time; select triethylamine as salt-forming agent. 2 the DOE 2 level factorial design method, to examine the amount of the main raw material of the emulsion particle size, Cobb value and printing surface strength. Through the study found the main factor affecting the Cobb values ??of the R value, the amount of DMPA, and E-44 in an amount to affect the particle size and the main factors of the printing surface strength; the R value, the amount of DMPA, E-44 usage and in degree . The R value, the amount of DMPA, DEG's usage and the neutralization degree for the particle size the effect of symbol is positive; E-44 in an amount on the particle size effect symbols negative. The effect of the amount on the Cobb value of DMPA sign is positive; the R value, the effect of E-44 in an amount and the neutralization degree of Cobb value sign is negative; little influence of the amount on the Cobb value of DEG. R-value, the amount of DMPA, E-44 in an amount and the neutralization degree of effect on the printing surface strength symbols n; amount of DEG's have little effect on the printing surface strength. The secondary factor levels are set as follows: in an amount of DEG is 4%; neutralization degree of 100%. Filter out the impact factor of the key indicators, to determine the level of optimization design. Derived by analysis of experimental results: The main factor is the degree of influence on the emulsion particle diameter of DMPA in an amount GT; E-44 in an amount gt; R value; The main factor is the degree of influence on the water absorption of the emulsion film of the R value GT ; E-44 the amount of the gt; DMPA dosage; major factor impact on the the emulsion application in Cobb value of R-value gt; E-44 amount gt; amount of DMPA; printing surface strength of the main factor of the emulsion applications impact The degree of R value the gt; amount of DMPA gt; E-44 amount. By optimization of the synthesis process of the experimentally derived epoxy-modified aqueous polyurethane is: R value is taken 2.6, DMPA dosage taken 8%, the amount of E-44 to take 8%, the amount taken of the EDG 4% and the neutralization degree 100%. Were characterized by infrared spectroscopy proved that the structure of the product. 4 through research and analysis, the application of synthetic surface sizing agent derived: When the amount of the synthetic sizing agent is 0.9g / m ~ 2,1.2 g / m ~ 2,1.5 g / m ~ 2 when compared with the base paper its Cobb values ??were reduced by 24.51%, 37.18%, 49.56%; printing surface strength were increased by 37.97%, 61.18%, and 64.97%, respectively. Oxidized starch with the polymer surface sizing agent, respectively, in different proportions with the surface sizing, the optimum ratio of the oxidized starch: E-in WPU = 92:8. Therefore, the synthetic surface sizing agent to a new polymerization method E-WPU, after the coating is not only efficient to improve the water resistance of the paper, while effective in improving the surface properties such as the surface strength of the paper sheet, the ink absorbent.

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