Resin corrosion prevention engineering construction process

Resin anti-corrosion engineering includes: resin rubber lining FRP whole surface layer and insulation layer, resin cement and mortar paving, jointing or potting block surface layer; resin clay, mortar single or composite overall surface Floor. The advantages of resin materials are: good corrosion resistance, water resistance, insulation, high strength and strong adhesion; FRP has light weight (equivalent to 1/4~1/5 of steel), good integrity, compactness and resistance Excellent temperature and adhesion, easy processing and so on. However, there are disadvantages such as poor impact resistance, high technical requirements, and high price. The technical standard is applicable to the surface layer and isolation layer of FRP lining on the surface of industrial and civil building structures; paving the surface layer of the block to make a single composite surface layer such as ground, wall skirt, foundation, channel and storage tank, etc. Anti-corrosion engineering.

First, construction preparation

(1) Material requirements

Resin

Commonly used resins are epoxy resin, unsaturated polyester resin, furan resin, phenolic resin, epoxy phenolic resin, epoxy furan resin, epoxy coal tar, and the like.

(1) Epoxy resin

Appearance should be light yellow to brown yellow thick transparent liquid, the quality should comply with the current national standard "E-type epoxy resin".

(2) Unsaturated polyester resin

There are bisphenol A type, xylene type and o-benzene type, bisphenol A type and o-benzene type are yellow transparent liquid; xylene type appearance is yellow, brown yellow viscous liquid.

(3) furan resin

There are anthrone type, sterol aldehyde type, anthrone acetal type and the like. The anthrone type should be a tan viscous liquid; the sterol aldehyde type, anthrone acetal type should be a brownish black liquid.

(4) Phenolic resin

The appearance should be brown-red viscous liquid.

(5) Coal tar

Its quality should comply with the current national standard "coal tar", its water content should not exceed 1%, no impurities.

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

It is made of epoxy resin mixed with coal tar, furan and phenolic resin. 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 resins use different curing agents.

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

A low-toxic curing agent should be preferred, and various amine curing agents such as ethylenediamine and m-phenylenediamine may be used, and a moisture-curing epoxy resin curing agent may be used for the wet base layer.

(2) Unsaturated polyester resin curing agent

Initiators and accelerators should be included. Commonly used initiators should be cyclohexanone dibutyl ester paste, methyl ethyl ketone dibutyl ester paste, benzoyl dibutyl acrylate paste; the accelerator should be cobalt naphthenate styrene, dimethylaniline Styrene solution.

(3) Curing agent for furan resin

Should be an acidic curing agent. The curing agent of the sterol furfural resin has been mixed into the powder. The fluorenone acetal resin uses a benzenesulfonic acid type curing agent.

(4) Phenolic resin curing agent

It is preferred to use benzenesulfonyl chloride and ethyl sulfate. The mass ratio of sulfuric acid to anhydrous ethanol in ethyl sulfate is preferably 1:2 to 1:3; when ethyl sulfate is combined with chlorine benzenesulfonate, the mass ratio is 1:1.

3. Toughener

It is used to improve the brittleness after curing, improve impact toughness, and reduce the viscosity of use.

(1) Epoxy resin toughening agent

Commonly used dibutyl phthalate, triphenyl phosphate, triphenyl phosphite polyester resin (No. 304, No. 3193) and the like.

(2) Furan resin toughening agent

Commonly used phthalic acid dibutanol, tung oil calcium rosin, refined benzene and so on.

(3) The phenolic resin toughening agent is made of tung oil calcium rosin.

4. Thinner

It is used to reduce the viscosity of the resin and improve the penetration ability.

(1) Epoxy resin diluent, acetone, ethanol, xylene or toluene is preferred.

(2) Unsaturated polyester resin diluent, using styrene.

(3) A phenolic resin diluent using anhydrous ethanol.

5. Resin FRP reinforcement

Non-paraffin emulsion type roving glass fiber plaid plain cloth, the thickness should be 0.2~0.4mm; warp and weft density should be 4×4~8×8 yarn number per square centimeter or thickness 0.2~0.4mm Glass fiber mat. The warp and weft density of the nonwoven polyester fabric should be 8 x 8 yarn counts per square centimeter.

6. Powder

Commonly used quartz powder, porcelain powder, diabase powder, graphite powder and barium sulfate powder. The acid resistance should not be less than 95%, and should not be less than 98% when using an acidic curing agent. Its volume stability should be qualified, and the water content should not exceed 0.5%. The fineness requirement is not to exceed 5% by the 0.15mm mesh sieve, and the remaining amount of the sieve through the 0.09mm sieve is 10~30%.

7. Fine aggregate

With quartz medium fine sand, the acid resistance should not be less than 95%, and when using an acidic curing agent, it should not be less than 98%. The water content should not exceed 0.5% and the particle size should be no more than 2 mm.

8. Block

There are acid-resistant bricks, cylinder bricks, acid-resistant ceramic plates, cast stone plates, etc., the varieties, specifications and grades, acid resistance, water absorption rate should meet the design requirements and relevant current national standards.

9. Stone

Uniform organization, no cracks or acid-resistant interlayer, its acid resistance should not be less than 95%; acid soaking stability, water absorption rate is not more than 1%, compressive strength should not be less than 100MPa.

(2) Main equipment and equipment

1. Institutional equipment

Glue mixer, sifter, brick cutting machine, grinding wheel cutting machine, portable grinder, angle grinder, ordinary grinder, hoisting lifting equipment, ventilator and heating equipment.

2. Main tools

Stainless steel ash knife, small hammer, tool steel flat shovel, putty knife, hand hammer, ordinary flat shovel, wool roller, scouring roller, scissors, zigzag scraper, wooden hammer, raft, ash trowel, paint brush, stirring Shovel, small shovel, hand-pushing rubber wheel, scale or platform scale, cement mixing bowl, porcelain barrel, bucket, water spoon, measuring cylinder, measuring cup, density meter, industrial thermometer, gas mask, harmful gas detector, magnetic thickness gauge, Electric spark detectors, etc.

(3) Working conditions

(1) All kinds of raw materials for construction and bricks, plates, pipes, stone materials, etc. should be prepared in accordance with the quality requirements of technical standards, and have sufficient quantity 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; the bricks should be cleaned and dried beforehand, and sorted and sorted according to dimensional tolerances.

(3) Prepare various measures such as rain, moisture, sun protection and cold protection of raw materials, bricks, boards, pipes, stone and construction sites.

(4) All kinds of construction machinery and equipment are ready, mechanical equipment should be inspected for maintenance, trial use, meet the requirements, all kinds of tools are complete, and there are certain spare quantities. Heating equipment and insulation products should be prepared for heat treatment.

(5) The concrete base layer for lining operation shall be flat, firm and compact, without honeycomb and pockmark, clean and dry, in the depth of #' ((in the thickness layer, the moisture content should generally not be greater than) *. The slope should be consistent with Design requirements, the yin and yang angle should be made into the surface of the arc steel base layer should be flat, no rust, welding burrs, burrs, welding tumors and uneven unequal defects. If so, should be treated.

(6) The base layer to be used as the isolation layer shall be provided with a separation layer 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 pre-embedded iron parts that pass through the anti-corrosion layer shall be pre-buried and subjected to derusting and anti-corrosion treatment.

(8) According to the raw materials on site, the laboratory proposes the compounding ratio of resin mortar and mortar through the test, and the quality should meet the design requirements and construction specifications.

(9) For the construction of large tanks and pits, scaffolding should be set up, hoisting machines, power supply, low-voltage lighting equipment, ventilation and air supply devices should be installed.

(10) Construction

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