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Your search keyword '"redispersible polymer powders"' showing total 11 results
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11 results on '"redispersible polymer powders"'

1. Redispersible Polymer Powders with High Bio‐Based Content from Core–Shell Nanoparticles.

Author

Zanoni, Arianna, Casiraghi, Cora, Po, Riccardo, Biagini, Paolo, Sponchioni, Mattia, and Moscatelli, Davide

Subjects
*POLYMERS, *EMULSION polymerization, *CONCRETE additives, *COCONUT palm, *CORE materials, *POWDERS
Abstract

Redispersible polymer powders (RDPPs), i.e., additives obtained from core–shell nanoparticles and commercialized in the form of a dry powder, find intensive application in the concrete industry. However, they are mainly produced from fossil resources. Therefore, the development of bio‐based RDPPs is important to reduce the carbon footprint of these additives. In this work, two types of core–shell nanoparticles with a high percentage of bio‐based content are synthesized and show to be good candidates as RDPPs. In the first case, up to 75% of bio‐based content is obtained by combining lauryl acrylate, derived from coconut and palm kernel oil, as main core material, with isobornyl methacrylate, coming from pine resin, exploited to create the outer harder shell. In the second case, a degradable macromonomer obtained by the ring opening polymerization of lactide using 2‐hydroxyethyl methacrylate as initiator is used as the core‐forming monomer to obtain degradable RDPPs. In both cases, the particles are synthesized with a two‐step emulsion polymerization process conducted in one pot and then spray‐dried to obtain the RDPPs of interest. The morphology and redispersibility of the powders are characterized. Finally, their use as concrete additives is preliminarily assessed by evaluating their effect on changes in the surface morphologies of concrete specimens. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Redispersible Polymer Powders with High Bio‐Based Content from Core–Shell Nanoparticles

Author

Arianna Zanoni, Cora Casiraghi, Riccardo Po, Paolo Biagini, Mattia Sponchioni, and Davide Moscatelli

Subjects
bio‐based polymers, core–shell nanoparticles, emulsion polymerization, redispersible polymer powders, spray‐drier, Materials of engineering and construction. Mechanics of materials, TA401-492, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Abstract Redispersible polymer powders (RDPPs), i.e., additives obtained from core–shell nanoparticles and commercialized in the form of a dry powder, find intensive application in the concrete industry. However, they are mainly produced from fossil resources. Therefore, the development of bio‐based RDPPs is important to reduce the carbon footprint of these additives. In this work, two types of core–shell nanoparticles with a high percentage of bio‐based content are synthesized and show to be good candidates as RDPPs. In the first case, up to 75% of bio‐based content is obtained by combining lauryl acrylate, derived from coconut and palm kernel oil, as main core material, with isobornyl methacrylate, coming from pine resin, exploited to create the outer harder shell. In the second case, a degradable macromonomer obtained by the ring opening polymerization of lactide using 2‐hydroxyethyl methacrylate as initiator is used as the core‐forming monomer to obtain degradable RDPPs. In both cases, the particles are synthesized with a two‐step emulsion polymerization process conducted in one pot and then spray‐dried to obtain the RDPPs of interest. The morphology and redispersibility of the powders are characterized. Finally, their use as concrete additives is preliminarily assessed by evaluating their effect on changes in the surface morphologies of concrete specimens.

Published
2023
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3. EFFECT OF DOSAGE OF REDISPUTABLE POWDERS AND THE TYPE OF LOW-MODULAR INCLUSIONS ON THE PROPERTIES OF FINE-AGGREGATE CONCRETE

Author

A. V. Dolgova and G. V. Nesvetaev

Subjects
dry construction mixtures, redispersible polymer powders, low-modulus inclusions, adhesion with concrete base, modulus of elasticity, tensile strength, compressive strength, Technology
Abstract

Objectives Reliability and durability of structures using materials with various properties (plaster coatings, cement glue, new concrete during repair and restoration of structures, etc.) largely depends on the adhesion of the layers and the deformation properties of the coatings. To obtain the required properties of materials used for coatings, modifiers based on polymers and low-modulus inclusions are introduced into the composition of new concretes, for example, entrained air. The aim of the work is to identify some patterns of change in the properties of concrete with the joint introduction of these modifiers.Method Experimental determination of the tensile strength in bending, compression, E-modulus, adhesion to the concrete base by standard methods.Result The influence of separate and joint introduction of dispersible polymer powders and various low-modulus inclusions into the composition of fine-grained concrete has been established.Conclusion The joint introduction to the composition of fine-grained concrete of various low-modulus inclusions and redispersible polymer powders provides a reduction in the stress level during forced deformations due to the different effects additives on the strength and deformation properties and contributes to increased adhesion to the concrete.

Published
2019
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4. Research on performance of high flowability and ultra-high early strength polymer repairing mortar.

Author

YANG Hui, WU Wenxuan, YE Xian, GUI Hongguang, ZHOU Zhuang, LEI Sheng, XU Peng, and LIANG Shigao

Abstract

Sulphoaluminate cement was modified with redispersible polymer powders to make repairing mortar, and the effects of different content of polymer powders on the mechanical properties and bonding properties were studied. The result shows that compressive strength of repairing mortar is gradually reduced, flexural strength and bonding strength are gradually increased, with the increase of polymer powder from o to 2%. When the content of polymer powder was 1.5%, the compressive strength of repairing mortar at 2h, 1 d and 28 d ages was 27.3 MPa, 42.3 MPa and 57.0 MPa respectively, tensile bond strength, interfacial flexural-tensile strength and recovery rate of tensile strength were 1.8 MPa, 7.8 MPa and 73.4% respectively. In addition, tensile bond strength can be further improved under the mixed conditions of polymer powder and polyethylene oxide (PEO), when the content of polymer powder and PEO is 1.5% and 0.5% respectively, the mortar's tensile bond strength can reach 2.31 MPa. [ABSTRACT FROM AUTHOR]

Published
2020

5. EFFECT OF DOSAGE OF REDISPUTABLE POWDERS AND THE TYPE OF LOW-MODULAR INCLUSIONS ON THE PROPERTIES OF FINE-AGGREGATE CONCRETE

Author

G. V. Nesvetaev and A. V. Dolgova

Subjects
dry construction mixtures, Technology, Materials science, low-modulus inclusions, 0211 other engineering and technologies, Young's modulus, 02 engineering and technology, 010501 environmental sciences, adhesion with concrete base, 01 natural sciences, symbols.namesake, Ultimate tensile strength, 021108 energy, redispersible polymer powders, Composite material, 0105 earth and related environmental sciences, Cement, Aggregate (composite), modulus of elasticity, compressive strength, Compressive strength, Properties of concrete, tensile strength, symbols, Deformation (engineering), Material properties
Abstract

Objectives Reliability and durability of structures using materials with various properties (plaster coatings, cement glue, new concrete during repair and restoration of structures, etc.) largely depends on the adhesion of the layers and the deformation properties of the coatings. To obtain the required properties of materials used for coatings, modifiers based on polymers and low-modulus inclusions are introduced into the composition of new concretes, for example, entrained air. The aim of the work is to identify some patterns of change in the properties of concrete with the joint introduction of these modifiers.Method Experimental determination of the tensile strength in bending, compression, E-modulus, adhesion to the concrete base by standard methods.Result The influence of separate and joint introduction of dispersible polymer powders and various low-modulus inclusions into the composition of fine-grained concrete has been established.Conclusion The joint introduction to the composition of fine-grained concrete of various low-modulus inclusions and redispersible polymer powders provides a reduction in the stress level during forced deformations due to the different effects additives on the strength and deformation properties and contributes to increased adhesion to the concrete.

Published
2019

6. Modifikace silikátových materiálů pro podlahy

Author

Šťastník, Stanislav, Ing. Miroslav Šťenko, Ph.D., LB Cemix, Šlechtický, Luboš, Šťastník, Stanislav, Ing. Miroslav Šťenko, Ph.D., LB Cemix, and Šlechtický, Luboš

Abstract

Bakalářská práce je věnována problematice podlahových materiálů na bázi cementu a sádry. V úvodní části jsou rozvedeny všeobecné vlastnosti a obecné požadavky na podlahy, dále jsou představeny nejdůležitější vlastnosti vybraných podlahových materiálů. Práce se věnuje modulu pružnosti, přídržnosti k podkladu a pevnostním parametrům zkoušených materiálů. Také hodnotí účinky redispergovatelných polymerních prášků v silikátových hmotách určených pro podlahy., The thesis is devoted to the issue of flooring materials, cement and plaster. In the first part are discussed general properties and general requirements for flooring, as well as presents the most important properties of selected flooring materials. The work is dedicated to the modulus of elasticity, adhesion to the substrate and strength parameters of the tested materials. It also evaluates the effects of redispersible polymer powders in silicate compositions intended for floors.

7. Modifikace silikátových materiálů pro podlahy

Author

Šťastník, Stanislav, Ing. Miroslav Šťenko, Ph.D., LB Cemix, Šlechtický, Luboš, Šťastník, Stanislav, Ing. Miroslav Šťenko, Ph.D., LB Cemix, and Šlechtický, Luboš

Abstract

Bakalářská práce je věnována problematice podlahových materiálů na bázi cementu a sádry. V úvodní části jsou rozvedeny všeobecné vlastnosti a obecné požadavky na podlahy, dále jsou představeny nejdůležitější vlastnosti vybraných podlahových materiálů. Práce se věnuje modulu pružnosti, přídržnosti k podkladu a pevnostním parametrům zkoušených materiálů. Také hodnotí účinky redispergovatelných polymerních prášků v silikátových hmotách určených pro podlahy., The thesis is devoted to the issue of flooring materials, cement and plaster. In the first part are discussed general properties and general requirements for flooring, as well as presents the most important properties of selected flooring materials. The work is dedicated to the modulus of elasticity, adhesion to the substrate and strength parameters of the tested materials. It also evaluates the effects of redispersible polymer powders in silicate compositions intended for floors.

8. Modifikace silikátových materiálů pro podlahy

Author

Šťastník, Stanislav, Ing. Miroslav Šťenko, Ph.D., LB Cemix, Šlechtický, Luboš, Šťastník, Stanislav, Ing. Miroslav Šťenko, Ph.D., LB Cemix, and Šlechtický, Luboš

Abstract

Bakalářská práce je věnována problematice podlahových materiálů na bázi cementu a sádry. V úvodní části jsou rozvedeny všeobecné vlastnosti a obecné požadavky na podlahy, dále jsou představeny nejdůležitější vlastnosti vybraných podlahových materiálů. Práce se věnuje modulu pružnosti, přídržnosti k podkladu a pevnostním parametrům zkoušených materiálů. Také hodnotí účinky redispergovatelných polymerních prášků v silikátových hmotách určených pro podlahy., The thesis is devoted to the issue of flooring materials, cement and plaster. In the first part are discussed general properties and general requirements for flooring, as well as presents the most important properties of selected flooring materials. The work is dedicated to the modulus of elasticity, adhesion to the substrate and strength parameters of the tested materials. It also evaluates the effects of redispersible polymer powders in silicate compositions intended for floors.

9. Modifikace silikátových materiálů pro podlahy

Author

Šťastník, Stanislav, Ing. Miroslav Šťenko, Ph.D., LB Cemix, Šťastník, Stanislav, and Ing. Miroslav Šťenko, Ph.D., LB Cemix

Abstract

Bakalářská práce je věnována problematice podlahových materiálů na bázi cementu a sádry. V úvodní části jsou rozvedeny všeobecné vlastnosti a obecné požadavky na podlahy, dále jsou představeny nejdůležitější vlastnosti vybraných podlahových materiálů. Práce se věnuje modulu pružnosti, přídržnosti k podkladu a pevnostním parametrům zkoušených materiálů. Také hodnotí účinky redispergovatelných polymerních prášků v silikátových hmotách určených pro podlahy., The thesis is devoted to the issue of flooring materials, cement and plaster. In the first part are discussed general properties and general requirements for flooring, as well as presents the most important properties of selected flooring materials. The work is dedicated to the modulus of elasticity, adhesion to the substrate and strength parameters of the tested materials. It also evaluates the effects of redispersible polymer powders in silicate compositions intended for floors.

10. Modifikace silikátových materiálů pro podlahy

Author

Šťastník, Stanislav, Ing. Miroslav Šťenko, Ph.D., LB Cemix, Šťastník, Stanislav, and Ing. Miroslav Šťenko, Ph.D., LB Cemix

Abstract

Bakalářská práce je věnována problematice podlahových materiálů na bázi cementu a sádry. V úvodní části jsou rozvedeny všeobecné vlastnosti a obecné požadavky na podlahy, dále jsou představeny nejdůležitější vlastnosti vybraných podlahových materiálů. Práce se věnuje modulu pružnosti, přídržnosti k podkladu a pevnostním parametrům zkoušených materiálů. Také hodnotí účinky redispergovatelných polymerních prášků v silikátových hmotách určených pro podlahy., The thesis is devoted to the issue of flooring materials, cement and plaster. In the first part are discussed general properties and general requirements for flooring, as well as presents the most important properties of selected flooring materials. The work is dedicated to the modulus of elasticity, adhesion to the substrate and strength parameters of the tested materials. It also evaluates the effects of redispersible polymer powders in silicate compositions intended for floors.

11. Modifikace silikátových materiálů pro podlahy

Author

Šťastník, Stanislav, Ing. Miroslav Šťenko, Ph.D., LB Cemix, Šťastník, Stanislav, and Ing. Miroslav Šťenko, Ph.D., LB Cemix

Abstract

Bakalářská práce je věnována problematice podlahových materiálů na bázi cementu a sádry. V úvodní části jsou rozvedeny všeobecné vlastnosti a obecné požadavky na podlahy, dále jsou představeny nejdůležitější vlastnosti vybraných podlahových materiálů. Práce se věnuje modulu pružnosti, přídržnosti k podkladu a pevnostním parametrům zkoušených materiálů. Také hodnotí účinky redispergovatelných polymerních prášků v silikátových hmotách určených pro podlahy., The thesis is devoted to the issue of flooring materials, cement and plaster. In the first part are discussed general properties and general requirements for flooring, as well as presents the most important properties of selected flooring materials. The work is dedicated to the modulus of elasticity, adhesion to the substrate and strength parameters of the tested materials. It also evaluates the effects of redispersible polymer powders in silicate compositions intended for floors.

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