Engineering of open assembly time of water-based polyvinyl acetate (PVAc) wood adhesives by post-addition of additives

2021 ◽  
pp. 103011
Author(s):  
Peter Bliem ◽  
Hendrikus W.G. van Herwijnen ◽  
Robert Meissl ◽  
Walter Stadlbauer ◽  
Johannes Konnerth
Keyword(s):  
Polyvinyl Acetate ◽  
Wood Adhesives ◽  
Assembly Time ◽  
Water Based

Open Assembly Time of Water-Borne Polyvinyl Acetate (PVAc) Wood Adhesives Affected by Various Factors

2021 ◽  
pp. 1-15
Author(s):  
Peter Bliem ◽  
Hendrikus W. G. van Herwijnen ◽  
Robert Meissl ◽  
Walter Stadlbauer ◽  
Johannes Konnerth
Keyword(s):  
Polyvinyl Acetate ◽  
Wood Adhesives ◽  
Assembly Time ◽  
Water Borne

scholarly journals A chain is no stronger than its weakest link: Weathering resistance of water-based intumescent coatings for steel applications

2020 ◽  
pp. 073490412096106
Author(s):  
Lars-Hendrik Daus ◽  
Bernhard Schartel ◽  
Volker Wachtendorf ◽  
Rolf Mangelsdorf ◽  
Manfred Korzen
Keyword(s):  
Polyvinyl Acetate ◽  
Water Soluble ◽  
Weakest Link ◽  
Intumescent Coatings ◽  
Water Based ◽  
Water Soluble Substance ◽  
A Chain ◽  
New Generation ◽  
Steel Substrates ◽  
Weathering Resistance

A systematic approach was used to investigate the weathering-induced degradation of a common water–based intumescent coating. In this study, the coatings are intended for humid indoor applications on steel substrates. The coating contains ammonium polyphosphate, pentaerythritol, melamine, and polyvinyl acetate. By replacing each ingredient with a less water-soluble substance, the most vulnerable substances, polyvinyl acetate and pentaerythritol, were identified. Furthermore, the weathering resistance of the system was improved by exchanging the ingredients. The coatings were stressed by artificial weathering tests and evaluated by fire tests. Thermogravimetry and Fourier-transform infrared spectroscopy were used to study the thermal decomposition. This study lays the foundation for the development of a new generation of water-based intumescent coatings.

scholarly journals Ultrasonication Technique: A Method for Dispersing Nanoclay in Wood Adhesives

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Alireza Kaboorani ◽  
Bernard Riedl ◽  
Pierre Blanchet
Keyword(s):  
Atomic Force Microscopy ◽  
Bond Strength ◽  
Polyvinyl Acetate ◽  
Shear Tests ◽  
Wood Adhesives ◽  
Force Microscopy ◽  
Block Shear ◽  
Atomic Force

The efficiency of ultrasonication technique to disperse nanoclay in polyvinyl acetate (PVA) was examined. A hydrophilic nanoclay was added to PVA, and its effects on bond strength of wood joints were determined. The results of bond strength measured on block shear tests showed that nanoclay increased the bond strength of wood joints, especially in humid conditions. Atomic force microscopy (AFM) proved that it can be used to examine the quality of nanoclay dispersion in a matrix very precisely. The results of this study showed that ultrasonication technique is efficient in mixing nanoclay with the PVA matrix.

Preparation and Properties of Water-Based Ultra-Thin Fireproof Coating for Steel Structures

2015 ◽  
Vol 1095 ◽  
pp. 662-665
Author(s):  
Yi Chao Zhang ◽  
Zhi Feng Li
Keyword(s):  
Titanium Dioxide ◽  
Flame Retardant ◽  
Polyvinyl Acetate ◽  
Steel Structures ◽  
Experimental Results ◽  
Inorganic Filler ◽  
Expandable Graphite ◽  
Char Layer ◽  
Water Based ◽  
Fireproof Coating

The water-based ultra-thin fireproof coating for steel structures was prepared by using polyvinyl acetate emulsion as binder, using flame retardant composed of ammonium polyphosphate (APP) , pentaerythritol (PTH) and melamine (MEL) as basic flame retardant system, using titanium dioxide as inorganic filler, then use expandable graphite (EG) to improve the thickness and compactness of char layer. The experimental results show that the coating has the best properties when the content of polyvinyl acetate emulsion is 32 % and the flame retardant is 38 % by mass, furthermore if added 4 % EG, the properties of coating would be better.

scholarly journals Pengaruh Konsentrasi Surfaktan Non-Ionik Terhadap Viskositas Perekat Polivinil Asetat Berbasis Air

KOVALEN ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 165-170
Author(s):  
Rony Pasonang Sihombing ◽  
Robby Sudarman ◽  
Agustinus Ngatin
Keyword(s):  
Surfactant Concentration ◽  
Polyvinyl Acetate ◽  
Ammonium Persulfate ◽  
Raw Material ◽  
Partial Hydrolysis ◽  
Ionic Surfactant ◽  
Concentration Variation ◽  
Continuous Polymerization ◽  
Vinyl Acetate Monomer ◽  
Water Based

Substrate combining could be done by using adhesive. In Indonesia, especially industrial field, solvent base adhesives were still being developed. This kind of adhesive was not environmental friendly and not safe handling. Therefore, Polyvinyl Acetate (PVAc) water-based adhesive was prepared as an outcome of this research as one of solution to overcome the problem above. Effect of surfactant concentration on the viscosity was aimed at this research. Semi continuous polymerization with stirring motor rates on 50 – 500 rpm was used (optional).  Pressure of 1 atm, 750C temperature, 5 – 6 hours reaction time for each was used as polymerization operation in this research. Vinyl Acetate Monomer (VAM), partial hydrolysis Polyvinyl Alcohol (PVOH), water, Ammonium Persulfate (APS) were prepared as raw material. NP-10 and NP-06 were non-ionic surfactants which each concentration was varied in this research. Water-based adhesive with NP-06 concentration variation resulting in viscosity from 98 m.Pa for 0.17 %wt concentration to 213 m.Pa for  0.68 %wt concentration. While NP-10 concentration variation resulting viscosity from 143 m.Pa for 0.17 %wt to 321 m.Pa for 0.68 %wt concentration. Therefore, adhesive with NP-10 surfactant concentration variable has a higher viscosity rate than NP-06 ones. Keywords: Water-based adhesive, non-ionic surfactant, adhesive viscosity

scholarly journals Kajian Pustaka Karakterisasi Perekat Polivinil Asetat Berbasis Air dengan Variabel Surfaktan

KOVALEN ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 23-29
Author(s):  
Rony Pasonang Sihombing ◽  
Dieni Nurul Fathiyyah ◽  
Nanda Liant Kumara ◽  
Agustinus Ngatin
Keyword(s):  
Particle Size ◽  
Surfactant Concentration ◽  
Polyvinyl Acetate ◽  
Polymerization Process ◽  
Lauryl Sulfate ◽  
Literature Study ◽  
Optimal Value ◽  
Water Based ◽  
Specific Particle

Polyvinyl acetate (PVAc) is an applicative polymer used as an adhesive material for one to another. These polymers can be synthesized through an emulsion polymerization process. In the industrial world, the process of making adhesive still involves environmentally unfriendly organic compounds containing xylene, benzene, and toluene. Therefore, water-based adhesive was introduced as an alternative to the PVAc synthesis solution. The aim of this literature review is to identify the type of surfactants used and analyze the PVAc characterization. This literature study focuses on the characterization of water-based PVAc with non-ionic nonylphenol (NP) surfactants including: NP-06, NP-10, NP 10 + 30, NP-30 and NP-40. Another surfactant used in this literature study is anionic surfactant Sodium Lauryl Sulfate (SLS) in units of Critical Micelle Concentration (CMC) including 1 CMC, 3 CMC, 5 CMC, 10 CMC, and 15 CMC. The result is a similarity in phenomena between the two types of surfactants. There is an increase in viscosity and a decrease in the value of the particle size as the surfactant increasing concentration used. However, in terms of the particle size, there is an optimal value where the specific NP surfactant concentration produces specific particle size with grit and at the specific SLS surfactant concentration produces relatively similar particle size.

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