Construction technology of the most popular resin

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The construction process of resin anti-corrosion engineering

resin anti-corrosion engineering includes: resin mastic lining FRP integral surface course and isolation layer, resin mastic and mortar paving, jointing or caulking block surface course; Single or composite integral surface course made of resin mastic and mortar. The advantages of resin materials are: corrosion resistance, water resistance, good insulation, high strength, strong adhesion; FRP has the advantages of light weight (equivalent to 1/4~1/5 of steel), good integrity and compactness, excellent temperature resistance and adhesion, and easy elimination from the following three aspects of processing and forming capacity. However, it has some disadvantages, such as poor impact resistance, high technical requirements for operation, and high price. This process standard is applicable to the laying of FRP integral surface course and isolation layer on the surface of industrial and civil building structures; Pave the block material surface course, and make the anti-corrosion works such as the single composite integral surface course of the ground, dado, foundation, ditch, storage tank, etc

I. construction preparation

(I) material requirements

1 Resin

common resins include epoxy resin, unsaturated polyester resin, furan resin, phenolic resin, for example, in order to overcome the weight gain and environmental pollution caused by deicing of internal wiring, epoxy phenolic resin, epoxy furan resin, epoxy coal tar, etc

(1) epoxy resin

the appearance should be light yellow to brownish yellow viscous transparent liquid, and its quality should meet the provisions of the current national standard "E-type epoxy resin"

(2) unsaturated polyester resin

has bisphenol a type, xylene type and o-benzene type, etc., and the appearance of bisphenol a type and o-benzene type is yellow transparent liquid; The appearance of xylene type is yellow and brownish yellow viscous liquid

(3) furan resin

has furfural ketone type, furfural alcohol type, furfural ketone type, etc. Furfural ketone type appearance should be brown viscous liquid; The appearance of furfural alcohol type and furfural ketone type shall be brown black liquid

(4) phenolic resin

appearance should be brownish red viscous liquid

(5) coal tar

its quality should meet the provisions of the current national standard coal tar, and its moisture content should not be greater than 1%, without impurities

(6) epoxy coal tar, epoxy furan resin and epoxy phenolic resin

are made by mixing epoxy resin with coal tar, furan and phenolic resin respectively. The ratio of epoxy to phenolic resin and furan resin is 70:30; The ratio of epoxy resin to coal tar is 50:50

2. Curing agent

different curing agents are used for different resins

(1) epoxy, epoxy phenolic, epoxy furan, epoxy coal tar resin curing agent

low toxicity curing agent should be preferred, and various amine curing agents such as ethylenediamine and m-phenylenediamine can also be used. Wet curing epoxy resin curing agent can be used for wet base

(2) unsaturated polyester resin curing agent

should include initiator and accelerator. The commonly used initiators should be dibutyl cyclohexanone peroxide paste, dibutyl methyl ethyl ketone peroxide paste and dibutyl benzoyl peroxide paste; The accelerator shall be cobalt naphthenate styrene solution and dimethylaniline styrene solution

(3) the curing agent of furan resin

should be acid curing agent. The curing agent of furfural alcohol resin has been mixed into the powder. Furfural ketone furfural resin uses benzenesulfonic acid type curing agent

(4) phenolic resin curing agent

benzene sulfonyl chloride and ethyl sulfate should be used. The mass ratio of sulfuric acid to absolute ethanol in ethyl sulfate should be 1:2~1:3; When ethyl sulfate and benzene sulfonic acid chloride are used in combination, the mass ratio is 1:1m20 or more, and 4 degrees and 10 degrees are used

3. Toughening agent

is used to improve the brittleness after curing, improve the impact toughness and reduce the viscosity

(1) epoxy resin toughener

dibutyl phthalate, triphenyl phosphate, triphenyl phosphite polyester resin (304, 3193) are commonly used

(2) furan resin toughener

dibutyl phthalate, tung oil calcium rosin, refined benzene, etc. are commonly used

(3) tung oil calcium rosin for phenolic resin toughener

4. Diluent

is used to reduce the viscosity of resin and improve the permeability

(1) acetone, ethanol, xylene or toluene should be used as epoxy resin diluent

(2) unsaturated polyester resin thinner, styrene

(3) phenolic resin diluent, using absolute ethanol

5. Resin FRP reinforcement material

adopts non paraffin lotion twistless roving glass fiber checkered plain cloth, and its thickness should be 0.2~0.4mm; The longitude and latitude density shall be 4 per square centimeter × 4~8 × 8 glass fiber felt with yarn number or thickness of 0.2~0.4mm. The warp and weft density of non-woven polyester cloth should be 8 per square centimeter × 8 yarn number

6. Powder

commonly used quartz powder, porcelain powder, diabase powder, graphite powder and barium sulfate powder. The acid resistance rate shall not be less than 95%. When using acid curing agent, it shall not be less than 98%. Its volume stability should be qualified, and the water content should not be greater than 0.5%. The fineness requires that the residue passing the 0.15mm sieve should not be greater than 5%, and the residue passing the 0.09mm sieve should be 10~30%

7. Fine aggregate

quartz medium fine sand shall be used, and the acid resistance rate shall not be less than 95%. When acid curing agent is used, it shall not be less than 98%. The moisture content shall not be greater than 0.5%, and the particle size shall not be greater than 2mm

8. The block materials

include acid resistant bricks, cylinder bricks, acid resistant ceramic plates, cast stone plates, etc. their varieties, specifications and grades, acid resistance and water absorption should meet the design requirements and the provisions of relevant current national standards

9. The strip stone

has uniform structure, no cracks or acid resistant interlayer, and its acid resistance rate should not be less than) 95%; The pickling stability is qualified, the water absorption is not more than 1%, and the compressive strength should not be less than 100MPa

(II) main machines and equipment

1 Mechanism equipment

mastic mixer, ash screening machine, brick cutting machine, grinding wheel cutting machine, portable grinder, angle grinder, ordinary grinder, winch lifting equipment, ventilator and heating equipment, etc

2. Main tools

stainless steel gray knives, small hammers, tool steel flat shovels, putty knives, hand hammers, ordinary flat shovels, wool rollers, bubble rollers, scissors, serrated scrapers, wood hammers, wood files, ash cutters, paint brushes, mixing shovels, small shovel, rubber wheeled carts, scales or platform scales, clay mixing pots, porcelain buckets, buckets, spoons, measuring cylinders, measuring cups, densimeters, industrial thermometers, gas masks, harmful gas detectors Magnetic thickness gauge, electric spark detector, etc

(III) operating conditions

(1) various raw materials and bricks, plates, pipes, stones, etc. for construction shall be prepared in full according to the quality requirements of technical standards, and there shall be sufficient quantities to meet the construction needs

(2) the storage place and construction site of various materials should be flat and solid, and the materials should be kept dry and clean; Bricks shall be cleaned and dried in advance, and then stacked according to dimensional tolerance after selection

(3) prepare raw materials, bricks, plates, pipes, stones and various measures for rain, moisture, sun and cold protection of the construction site

(4) all kinds of construction machines and equipment are ready. The mechanical equipment polyvinyl alcohol (PVA) hydrogel has high compatibility with human tissue, non-toxic side effects, no degradation, stable chemical properties, good elasticity, high water content, which should be inspected, repaired and tested. All kinds of tools have complete specifications and a certain number of spare parts. For works requiring heat treatment, heating equipment and insulation supplies shall be prepared

(5) the concrete base course for lining operation shall be flat, firm, dense, free of honeycombs and pitted surfaces, clean and dry, and the moisture content shall not be greater than * in the depth of # '((thickness layer). The slope shall meet the design requirements, and the internal and external corners shall be made into an arc. The surface of the steel base shall be flat and free of rust, welding scar, burr, weld beading and uneven concave convex defects. If any, it should be handled

(6) for the base course requiring isolation layer, the isolation layer shall be made according to the design requirements and construction specifications, and the surface shall be sprinkled with fine sand to make it rough

(7) all pipes, casings, reserved holes and embedded iron parts passing through the anti-corrosion coating shall be embedded in advance, and derusting and anti-corrosion treatment shall be carried out

(8) according to the on-site raw materials, the laboratory puts forward the mix proportion of resin mastic and mortar through tests, and its quality should meet the design requirements and construction specifications

(9) for the construction of large tanks and pits, scaffolds should be erected and windlasses, power supplies, low-voltage lighting equipment, ventilation and air supply devices should be installed

(10) construction

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