CN108250848A - A kind of pipeline impregnation - Google Patents

Abstract

In order to solve the problem of that the bad production maintenance of the antiseptic property of current gas piping is of high cost, the present invention provides a kind of antiseptic finish methods of gas piping, include the following steps：Derusting；After processing of rust removing smearing asphalt primer is carried out in 1 hour；Pipeline is heated, gas piping temperature controls 190 DEG C~210 DEG C after heating, then spraying corrosion resistant coating；Finishing coat is smeared, finishing coat uses polyurethane anti-corrosion paint.The antiseptic finish method of gas piping of the present invention is used and is first primed, clinkering type ring oxygen powder bed is further added by, finally smears the mode of finishing coat, main function is being capable of anti-corrosion, extraneous more complicated soil environment and climatic environment are resisted, the ability with extremely strong weatherability and resistant to mechanical damage.

Description

A pipe impregnation process

technical field

The invention relates to the technical field of pipeline processing, in particular to the field of antirust processing of pipelines.

Background technique

In the prior art, galvanized pipes are commonly used for anti-corrosion of pipelines. Galvanized steel pipes are hard in texture, high in rigidity, high in toughness, solid and reliable, and widely used. Compared with various existing plastic pipes, galvanized steel pipes have major defects After long-term water immersion on the inner wall of the pipeline, corrosion will occur, and the inner wall of the pipeline will gradually become loose and uneven, increasing water resistance, and what is more serious is that the corrosion of the inner wall will cause water to contain rust; so many engineering plastic pipes and plastic pipes have appeared. Compared with traditional steel pipes, it has the advantages of light weight, corrosion resistance, long service life, small water flow resistance, and energy saving. However, the pressure resistance, impact resistance, and high and low temperature resistance of plastic pipes are much worse than traditional steel pipes. Therefore, how to achieve both pressure resistance and rust prevention is a problem encountered by those skilled in the art.

Contents of the invention

In order to solve the current demand for pipelines to be pressure-resistant and rust-proof, the present invention provides a plastic dipping process for pipelines. , Pressure-resistant pipelines.

A kind of pipeline dipping process that the present invention relates to comprises the following steps:

S1: Rust removal, soak the pipeline in pickling solution for rust removal;

S2: cleaning and drying, the cleaning solution is a saponification solution with a concentration of 15-20%;

S3: dipping, heating the pipe to 100°C-150°C, and performing rotomolding treatment, the rotomoulding material is a polyolefin modified material;

S4: heat preservation, heat preservation of the pipe after dipping in the range of 80 ℃ to 120 ℃ for 5 minutes to 10 minutes;

S5: Cooling test, cool the plastic-impregnated pipe after heat preservation to normal temperature naturally, and then test whether it is qualified.

Further, the volume ratio of the pickling liquid is 40% of hydrochloric acid, 30% of phosphoric acid, 7% of triethanolamine, 11% of sulfuric acid, 8% of sodium lauryl sulfate, and the rest is replenished to 100% with distilled water.

Further, in the second step, the saponification temperature is controlled at 100° C. to 120° C. for 3 to 5 minutes.

Further, the weight proportion of the polyolefin modified material includes: 15 parts of polypropylene, 12 parts of polyethylene, 17 parts of calcium carbonate, and 3 parts of organosilicon compound.

The invention adopts the method of dipping to form a plastic anti-corrosion layer on the inner and outer surfaces of the pipeline, which has high mechanical strength, strong pressure bearing capacity, excellent electrical insulation ability, high hardness and smooth outer surface, small friction coefficient, low water absorption rate, and wide service temperature range. and other inherent characteristics of steel-plastic composite pipes.

Detailed ways

In the actual use of a pipeline dipping process of the present invention, ordinary carbon steel pipes are used as the basic pipeline, and the specific processing methods in this embodiment are as follows:

S1: Rust removal, soak the pipeline in pickling solution for rust removal; in this embodiment, the volume ratio of the pickling solution is 40% hydrochloric acid, 30% phosphoric acid, 7% triethanolamine, 11% sulfuric acid, dodecyl Sodium alkyl sulfate is 8%, and the rest is added to 100% with distilled water; the addition of pickling corrosion inhibitor will not affect the removal of rust spots on the metal surface, and can ensure that the substrate of the workpiece is corroded by the acid solution as little as possible.

S2: Clean and dry; put the rust-removed pipeline into saponification solution with a concentration of 15-20% for saponification treatment, control the saponification temperature at 100°C-120°C for 3-5 minutes, and clean the residue after pickling Liquid, while preventing the pipeline from rusting.

S3: dipping, heating the pipe to 100°C-150°C, and performing rotomolding treatment. In order to improve anti-corrosion performance, the rotomolding material is a polyolefin modified material. In order to improve the adhesion between the coating and the substrate, this embodiment The weight proportion of the polyolefin modified material includes: 15 parts of polypropylene, 12 parts of polyethylene, 17 parts of calcium carbonate, and 3 parts of organosilicon compound.

S4: Heat preservation. In order to cure the impregnated layer, heat the impregnated pipe at 80°C to 120°C for 5min to 10min.

S5: Cooling inspection, cooling the heat-preserved plastic-impregnated pipe to normal temperature naturally, and then checking whether it is qualified. In this embodiment, it mainly detects whether the surface of the plastic-impregnated pipe is evenly impregnated with plastic, and whether the thickness of the impregnated plastic is uniform.

The invention adopts the method of dipping to form a plastic anti-corrosion layer on the inner and outer surfaces of the pipeline, which has high mechanical strength, strong pressure bearing capacity, excellent electrical insulation ability, high hardness and smooth outer surface, small friction coefficient, low water absorption rate, and wide service temperature range. Such as the inherent characteristics of steel-plastic composite pipes; and the polyolefin modified material coating is used in the present invention, which is suitable for hot water pipes, and the plastic-coated composite steel pipes using this coating can adapt to the occasions where large temperature differences alternately change.

Although the specific embodiments of the present invention have been described and illustrated in detail above, it should be pointed out that we can make various equivalent changes and modifications to the above-mentioned embodiments according to the concept of the present invention, and the functional effects produced by it are still the same. Anything beyond the spirit covered by the description shall be within the protection scope of the present invention.

Claims (4)

1. a kind of pipeline impregnation, which is characterized in that include the following steps：

S1：Derusting, pipeline is immersed in pickle and is derusted；

S2：Cleaning, and it is dry, and cleaning solution uses a concentration of 15~20% saponification liquor；

S3：Leaching modeling carries out pipeline to be heated to 100 DEG C~150 DEG C, carries out rotational moulding processing, the rotational moulding material changes for polyolefin Property material；

S4：Heat preservation, the pipeline after being moulded to leaching are carried out in 80 DEG C~120 DEG C range inside holding 5min~10min；

S5：Leaching modeling pipeline after heat preservation is naturally cooled to room temperature, then detects whether qualification by cooling detection.

2. pipeline impregnation according to claim 1, which is characterized in that the pickle volume proportion is hydrochloric acid 40%, Phosphoric acid 30%, triethanolamine 7%, sulfuric acid 11%, lauryl sodium sulfate 8%, remaining adds to 100% with distilled water.

3. pipeline impregnation according to claim 1 or 2, which is characterized in that saponification temperature control exists in second step 100 DEG C~120 DEG C, 3~5min of time.

4. pipeline impregnation according to claim 4, which is characterized in that the polyolefine modified material Ingredients Weight is matched Than including：15 parts of polypropylene, 12 parts of polyethylene, 17 parts of calcium carbonate, 3 parts of organo-silicon compound.