Synthesis of Carbon Black Dispersant and Preparation of Resin Black Matrix
Date Issued
2007
Date
2007
Author(s)
Peng, Yu-Hsiang
DOI
zh-TW
Abstract
In order to prevent the coagulation of carbon black in organic solvent (PGMEA), this work was to synthesize a carbon black dispersant. Further, it can be used in the preparation of resin black matrix (RBM). There are three parts in this study: synthesis of dispersant, dispersion of carbon black, and the preparation of RBM.
First, styrene, HEMA, EHA, and DMAEMA were used to synthesize random and block copolymers containing amino and hydroxyl group via nitroxide mediated polymerization. Therefore, we can control the molecular weight and the structure of polymers. The unsaturated vinyl group could be introduced into polymer by the reaction of isocyanate with hydroxyl group and the UV-curable carbon black dispersant could be obtained.
The tertiary amine of DMAEMA in the copolymers can be anchoring group of carbon black. The dispersant, PSDHc=c, can provide more steric barrier, and the carbon black can be dispersed to around 110nm. However, the dispersant addition must be 30wt% of carbon black, it’s too high for the application of preparing RBM.
The diblock copolymer (A-B type) PSEH-PSEHD or PSEH-b-PD can also be used as dispersant. The addition of these A-B type dispersant need only 15~20wt% of carbon black, and carbon black can be dispersed to 90~100nm. But the PSEH-b-PD with DMAEMA homopolymer, which have higher polarity, will lead to aggregation of carbon black. We have to add some resin with acid group and the carbon black dispersion can be approved.
Because the dispersants with unsaturated vinyl group, which have urethane group, may lead to some bridge of particles, the carbon black will aggregate. If add resin, the aggregation will more critical. However, the carbon black still can be dispersed to around 110nm.
By using A-B type dispersant, the carbon black will be dispersed well and can be used to preparing RBM. The film thickness of prepared RBM is 1μm, and optical density (OD) is around 3.5.
Subjects
碳黑
分散劑
活性自由基聚合
三級胺
黑色矩陣
carbon black
dispersant
living free radical polymerization
tertiary amine
black matrix
Type
thesis