Epoxy Resin Repair Of Ancient Buildings
HC coating Network News: Abstract: Epoxy resin Has many good characteristics
, in building maintenance, heritage conservation plays a very important role. In actual use, the use is very important.
Key words: epoxy resin repair of ancient architecture structure reinforcement
1 Introduction Epoxy resin is the molecule contains two or more genes of the organic polymer epoxy. Colorless, yellow or brown viscous liquid. Density (20 ) 1.1 ~ 1.2g/cm3. Cross-linked hard transparent resin, mostly yellow. Density 1.2-1.38g/cm3. Soluble Acetone , Fat, aromatic and chlorinated hydrocarbons. Crosslinked resin is stable. Insoluble in any organic Solvent . Polyester resin , Phenolic resin Than in the curing process show very low shrinkage (less than 2%).
(5) mechanical properties. Cured epoxy resin system with excellent mechanical properties.
(6) electrical properties. Cured epoxy resin system is a high dielectric properties, resistance to surface leakage, excellent insulation resistance arc.
(7) chemical stability. Typically, the cured epoxy resin system with excellent alkali resistance, acid resistance and solvent resistance. As curing epoxy system, like other properties, chemical stability also depends on the selected resin and Curing agent . Appropriate use of epoxy resin and curing agent, can make a special chemical stability.
(8) dimensional stability. Many properties of the integrated, so that epoxy resin has outstanding dimensional stability and durability.
(9) resistance to mold. Most resistant epoxy resin system cured mold can be used harsh tropical conditions.
3 repair of wooden structures Age-old wooden building, regardless of the main load-bearing components or decorative elements, are an integral part of the heritage buildings. If you take a simple replacement of maintenance practices, will reduce the heritage value, so as to retain the existing heritage building maintenance component is a basic principle. This can be applied to find an old wooden building components reinforcement bonding material, epoxy resin just right to meet this requirement. Epoxy resin used in the reinforcement of timber structures, mainly used for wooden pillars initiations, Liang Fang joints stick by, modulation epoxy Putty And so on and concrete construction technology are as follows:
3.1 wooden pillars Generally pests (especially termites) decay or rotten hollow, wooden pillars and the shell intact for water reinforcement approach. First column of the damaged parts of the slot 13cm knife saws sawing, keep sawing wood under the article to be cleared within the paste back into place after. Wooden pillars inside the rotten wood rotten or termite dust cleared, the notch of wood with epoxy paste back, and back sealing with epoxy putty around the joint and stakes of the above paste crack and hole size, water leaving the upper parts of water holes, sub-irrigation, each about 1M, poured into the unsaturated polyester material of about 3 ~ 4Kg? (excluding fillers) for each irrigation interval of 0.5h, until the filling date, the wooden pillars were ants termite damage parts of the surface with a ring epoxy resin pick up new material, with polyester putty to fill the size of the crack, filling material formula: unsaturated polyester resin ring has been ketone peroxide (curing agent) 3.2 Lanna tenon of production and the amount of cleaning will Lanna amount of viscous decay assembled and the extension removed, and the amount of centers in the Lanna width and thickness of sawn rather, about 70cm of d I (length and width and the length of Lanna amount) and the d population size produced two quite Fang, with alkali-free wax glass cloth sticking in the Fang, the brushing of unsaturated polyester resin slurry, brushing to algae and even to be resin, glass cloth Ling Yun was declared. Brushing process, brush off any air bubbles (bubbles will decrease strength glass fiber reinforced plastic), wrapping made of two glass fiber reinforced plastic shell pouring new tenon. After the glass because of the new tenon and mortise exit the Lanna good amount of the transfer agreement, and cracks with epoxy resin infusion, both tired of epoxy putty well, Lanna bond amount and the new parts were fitted together with polyester resin and glass cloth wound about 1cm thick, until the amount of cross section with a high degree of consistency Lanna (Lanna advance the amount of the removed section about 1cm). This made a 1cm thick glass fiber reinforced plastic hoop, using the formation of polyester resin shrinkage Hoop close. Wood surface cracks, holes and large defect filled with polyester resin putty fill compaction. D in the mouth in the brush on the wooden pillars anti-termite agents, connect Lanna amount assembled. Unsaturated polyester resin grout formula: unsaturated polyester resin (307 #): Cyclohexanone peroxide between dibutyl phthalate (curing agent): naphthalene Cobalt styrene (accelerator): quartz powder (320 mesh ) = 100:4:3:120 (weight ratio)
Epoxy putty formula: epoxy resin (6101 #): Polyamide (203 #): diethylenetriamine: acetone: ethanol: quartz powder (320 mesh) = 100:40:8:10:10:150 (weight)
Unsaturated polyester, curing agent and accelerator are belong to toxic, flammable, explosive materials, preparation of income distribution must be in order, and mix thoroughly then add the accelerator, the operation should make labor protection.
3.3 patch Liang Fang 1981 in Mount Wutai Nanzenji the maintenance of long-term decay, weathering and break the small minute fly mission? Flood-employed Lai is the thumb? Intestinal worm? Message after media milling Yoshiharu kill key Ying S did not cost bear in mind the narrow skeletal mane?? Kill vehicle mu? toad thumb? Jia Huang Zhen Chen enamel brag 4 trunk? mm wide cracks with crack pouring formula, less than 4mm wide crack injection formula. Treatment, the indoor temperature is maintained at 15-25 , easy to complete curing of epoxy resin to improve strength, the specific formula: Bond formula: 6101 100 +501 # # epoxy resin active diluent 10 + polyethylene polyamine 14
Pouring formula: 6101 100 +501 # # epoxy resin active diluent 15 + polyethylene polyamine 15.
Injection formula: 6101 100 +501 # # epoxy resin active diluent 20 + polyethylene polyamine 16.
3.4 Other component repair
Column foot wooden rafters of the old material and end of defects and decay parts of immersion can increase the strength of acrylic resin, epoxy resin where needed to be plastic. Column base of the pier to take in new material, the use of marketing and original wooden pillars connect with epoxy resin adhesive. Cross-section of wood is generally sold pillar section 1 / 4 of a length of 2 times the column diameter. Can be square or round. The first nest of white pillars with acrylic resin soaked, and then filled with epoxy polysulfide rubber. Doors and windows of the upper threshold, lower threshold of interfaces repaired with epoxy resin. Advantages and disadvantages of dealing with wood epoxy, curing few wrinkles, can be cold cured resin with flexibility and strength, pieces of treated wood, strength and markedly improved bacteria, insect damage, a variety of solutions and the impact of climate change, and so on has a strong resistance and tolerance.
Epoxy Resin Repair Of Ancient Buildings
By: xt
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