Preparation and Tribological Performace of Microcapsules of Butyl Stearate and Melamine-Formaldehyde Resin

With butyl stearate (BS) as the core material and melamine-formaldehyde resin (MF) as the wall material, BS-MF resin microcapsules were synthesized under in situ polymerization method. The microcapsules were characterized using FTIR, SEM and other methods. The four-ball friction method was performed to test the tribological property of the microcapsules when polyethylene glycol was taken as the base fluid. The results showed that base fluid with 3% microcapsules had a friction coefficient as small as 0.053 and the wear scar diameter could be 0.326mm (4%) under 314N. The microcapsules were ruptured under the action of friction and then the reactive group formed physical adsorption film. The physical adsorption film, together with the subsequently formed friction polyester film, presented a synergistic lubricating effect.

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Preparation of Melamine-Formaldehyde Resin Microcapsules Used for Electrophoretic Display

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.361-363.1576 ◽

2011 ◽

Vol 361-363 ◽

pp. 1576-1581

Author(s):

Hua Feng Xian ◽

Yi Zhong ◽

Yan Luo

Keyword(s):

In Situ Polymerization ◽

Optical Microscope ◽

Core Material ◽

Wall Material ◽

Formaldehyde Resin ◽

Melamine Formaldehyde ◽

The Core ◽

Melamine Formaldehyde Resin ◽

Preparation Conditions ◽

Electrophoretic Display

The microcapsules used for electrophoretic display were prepared by in-situ polymerization. The core material contained electrophoretic particles (phthalocyanine blue and TiO2) and tetrachloroethylene (TCE), and the wall material were made of melamine-formaldehyde resin. The effects of preparation conditions, such as the concentration of surfactant, the ratio of core material to wall material, the pH values were all experimentally investigated. Moreover, titanium dioxide (TiO2) particles were modified with 3-(trimethoxysilyl)propyl methacrylate (TPM) in order to obtain a lipophilic surface. Furthermore, the modified TiO2was coated with polystyrene (PS) for improving the density mismatch between TiO2particles and TCE. The core material of phthalocyanine blue was modified with octadecylamine to improve its dispersibility in TCE. The morphology of microcapsules was observed by optical microscope. The coated TiO2particles were characterized by scanning electron microscope and thermogravimetry analysis. The modified TiO2particles and phthalocyanine blue were determined by FTIR spectrometry.

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Preparation and Optimization of Waterborne Acrylic Core Microcapsules for Waterborne Wood Coatings and Comparison with Epoxy Resin Core

Polymers ◽

10.3390/polym12102366 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2366 ◽

Cited By ~ 1

Author(s):

Xiaoxing Yan ◽

Yu Tao ◽

Xingyu Qian

Keyword(s):

In Situ Polymerization ◽

Urea Formaldehyde ◽

Paint Film ◽

Bath Temperature ◽

Water Bath ◽

Core Material ◽

Wall Material ◽

Formaldehyde Resin ◽

The Core ◽

Resin Core

Microcapsules were prepared by in situ polymerization with urea formaldehyde resin as the wall material and Dulux waterborne acrylic acid as the core material. The effects of the core–wall ratio, water bath temperature and depositing time on the morphology, particle size, yield and encapsulation ratio of microcapsules were investigated by orthogonal experiment of three factors and two levels. The results showed that the core–wall ratio had the greatest influence on the performance of microcapsules. When the core–wall ratio was 0.58:1, the water bath temperature was 70 °C, and the depositing time was 5 d, the microcapsule performance was the best. With the increase in depositing time, the yield of microcapsule particles increased gradually, and the microcapsules appeared to show an adhesive phenomenon. However, the long-term depositing time did not lead to complete deposition and agglomeration of microcapsules. When 10.0% concentration of the waterborne acrylic microcapsules with 0.58:1 of core–wall ratio was added to the coatings, the mechanical and optical properties of the coatings did not decrease significantly, but the elongation at break increased significantly. Therefore, this study offers a new prospect for using waterborne acrylic microcapsules to improve the toughness of waterborne paint film which can be cured at room temperature on a wood surface.

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Microencapsulation of butyl stearate with melamine-formaldehyde resin: Effect of decreasing the pH value on the composition and thermal stability of microcapsules

eXPRESS Polymer Letters ◽

10.3144/expresspolymlett.2012.88 ◽

2012 ◽

Vol 6 (10) ◽

pp. 826-836 ◽

Cited By ~ 30

Author(s):

B. Alic ◽

U. Sebenik ◽

M. Krajnc

Keyword(s):

Thermal Stability ◽

Ph Value ◽

Formaldehyde Resin ◽

Melamine Formaldehyde ◽

Melamine Formaldehyde Resin ◽

Butyl Stearate ◽

Thermal Stability Of

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Preparation and Performance of Thermochromic and Self-Repairing Dual Function Paint Film with Lac Resin Microcapsules and Fluorane Microcapsules

Polymers ◽

10.3390/polym13183109 ◽

2021 ◽

Vol 13 (18) ◽

pp. 3109

Author(s):

Xiaoxing Yan ◽

Wenting Zhao ◽

Lin Wang

Keyword(s):

In Situ Polymerization ◽

Urea Formaldehyde ◽

Paint Film ◽

Impact Resistance ◽

Core Material ◽

Wall Material ◽

Formaldehyde Resin ◽

Dual Function ◽

Aging Resistance ◽

Water Based

Microcapsules with lac resin as the core material and urea-formaldehyde resin as the wall material were prepared by in situ polymerization, and then the lac resin microcapsules and fluorane microcapsules were added into a water-based primer or topcoat, respectively, to prepare water-based coatings with dual functions of thermochromic and self-repair. The effects of different methods of adding microcapsules on the optical properties, mechanical properties, self-repairing properties, and the aging resistance of water-based paint film were investigated, so as to prepare water-based paint film with the best discoloration and self-repairing functions. The results showed that the paint film with 10.0% fluorane microcapsules in the topcoat and 5.0% lac resin microcapsules in the primer had better comprehensive properties, and the paint film changed from yellow to colorless at 32 °C, with a color difference of 68.9, hardness of 3H, adhesion grade of 0, impact resistance of 13.0 kg∙cm, and elongation at break of 20.0%. The resistance of the paint film to NaCl, ethanol, and detergent was grade 2, with slight discontinuous marks, and the resistance to red ink was grade 3, with slight marks. The lac resin microcapsules have good aging resistance, which can enhance the aging resistance of the paint film with fluorane microcapsules. The gap width of the paint film was repaired by 2.1 µm, the self-repairing rate was 12.3%, and the paint film with lac resin microcapsules had a better crack inhibition effect. The results have provided a reference for multifunctional wood coatings.

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Modification of Water Reducer on Desulfurization Gypsum Wall Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.700.191 ◽

2013 ◽

Vol 700 ◽

pp. 191-194

Author(s):

Ai Hong Guo ◽

Shuang Feng ◽

Jin Xia Zhang ◽

Fu Sheng Niu

Keyword(s):

Adverse Effect ◽

Setting Time ◽

Acid Water ◽

Wall Material ◽

Formaldehyde Resin ◽

Polycarboxylic Acid ◽

Melamine Formaldehyde ◽

Obvious Effect ◽

Melamine Formaldehyde Resin

In order to broaden the utilization of desulfurization gypsum in China and achieve the direct usage of desulfurization gypsum, in this paper, Polycarboxylic acid water-reducer (HC), Naphthalene sulfonate formaldehyde polycondensate (NF) and Sulfonated melamine formaldehyde resin (SM) were selected as water reducer to modify desulfurization gypsum. The experiment results are as follows: SM water reducer has little effect on setting time of desulfurization gypsum, although it is helpful to increase the strength of the gypsum-sample, however, compared with HC and NF, it has no obvious effect. About HC water reducer, it has obvious effect on setting time of desulfurization gypsum, so does it to desulfurization gypsum strength, but, higher water using of normal consistency will do adverse effect on the whole with the increase of the dosage. NF water reducer has the similar effect on setting time and sample's strength on desulfurization gypsum with HC, but the dominant changes have no discipline among different mixing amounts with these two water reducer. Lower water using of normal consistency benefits the retention of the sample's strengths.

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