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Corrosion resistant material and method for preparing corrosion resistant roots vacuum pump

A corrosion-resistant material and weight technology, applied in pumps, mechanical equipment, rotary piston pumps, etc., can solve the problems of inability to guarantee the system vacuum degree in a long-term and stable manner, inconvenient continuous production, and high comprehensive operating costs, and achieve daily operation. Low maintenance, simple manufacturing process and small processing volume

Inactive Publication Date: 2009-04-29
淄博华舜耐腐蚀真空泵有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, petroleum, chemical, pharmaceutical, papermaking, food and other industries will produce a large amount of corrosive gases containing water vapor during the production process. These gases are highly corrosive to equipment. The existing cast iron or steel Roots vacuum pumps are not only intolerant Corrosion, and because a good sealing form cannot be used, the pump chamber and the oil tank are isolated only by the skeleton oil seal. When the circulating water flows back into the pump chamber, not only the bearing is vulnerable, but also the lubricating oil is deteriorated.
Especially when pumping strong corrosive gases such as hydrochloric acid and sulfuric acid, the circulating water will form acid liquid due to the dissolution of these corrosive gases. Corrosion is caused by flow-through parts such as shafts and shafts, so the vacuum degree of the system cannot be guaranteed for a long time and stably, the operating life is short, and the overall operating cost borne by the user is high, which brings great inconvenience to continuous production.
[0004] In order to solve the corrosion resistance problem of Roots vacuum pumps, stainless steel Roots vacuum pumps and Roots vacuum pumps lined with corrosion-resistant layers have been developed successively. These new pumps have certain improvements in corrosion resistance compared with traditional cast iron and cast steel Roots vacuum pumps. , but there are still disadvantages such as small corrosion resistance range, easy to fall off corrosion resistance layer, short service life and high cost
At the same time, because the Roots vacuum pump has high requirements on the processing accuracy of each component, the above-mentioned Roots vacuum pump also has the disadvantages of large amount of finishing and cumbersome manufacturing process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put the glass fiber with a length of 70mm into an oven for dewaxing treatment. The treatment condition is to bake at a temperature of 260±5°C for 1 hour, and cool down naturally before use. Preparation of matrix and auxiliary materials: take 200 grams of 2123 phenolic resin and 17 grams of urotropine, mix the two evenly, then add 1800 grams of sintered electrode graphite that has passed through a 40-mesh sieve and stir evenly to make a premix; take the viscosity as For 60 seconds, 980 grams of phenolic resin, 800 grams of methanol, 0.5 grams of KH-550 coupling agent, and 9.8 grams of oleic acid are fully stirred. First add 200 grams of dewaxed glass fiber, and then add the premix. Kneading uniformly on the 5-type kneader, and then air-dried naturally to obtain a corrosion-resistant resin-based composite material.

[0029] Install the pressing mold on a 300-ton plastic hydraulic press, heat up to 170±5°C to dispose of material, close the mold and pressurize it to 180Kgf, kee...

Embodiment 2

[0032] The anti-corrosion material of the present invention is divided into 100% by weight: graphite 56%, glass fiber 6.2%, phenolic resin 7.8% and wetting agent 30%;

[0033] Add 0.26% of coupling agent, 8.7% of accelerator and 360% of diluent based on the weight of phenolic resin;

[0034] Add 4.6% of the release agent based on the weight of the wetting agent.

[0035] among them:

[0036] The graphite is sintered electrode graphite powder, the particle size is passed through a 40-mesh sieve.

[0037] The glass fibers are short fibers of 50 to 70 mm.

[0038] The coupling agent is KH-550 coupling agent.

[0039] The accelerator is urotropine.

[0040] The diluent is ethanol.

[0041] The release agent is stearic acid.

[0042] The humectant is a phenolic resin with a viscosity of 60 seconds.

[0043] The method for preparing the flow parts of the corrosion-resistant Roots vacuum pump from the above-mentioned corrosion-resistant materials is as follows:

[0044] The glass fiber u...

Embodiment 3

[0048] The anti-corrosion material of the present invention is divided into 100 parts by weight: graphite 56.5%, glass fiber 6.3%, phenolic resin 7.9% and wetting agent 29.3%;

[0049] Add 0.22% of coupling agent, 8.3% of accelerator and 390% of diluent based on the weight of phenolic resin;

[0050] Add 5% of the release agent based on the weight of the wetting agent.

[0051] among them:

[0052] The graphite is sintered electrode graphite powder, the particle size is passed through a 60 mesh sieve.

[0053] The glass fibers are short fibers of 50 to 70 mm.

[0054] The coupling agent is KH-550 coupling agent.

[0055] The accelerator is urotropine.

[0056] The diluent is methanol.

[0057] The release agent is stearic acid.

[0058] The humectant is a phenolic resin with a viscosity of 60 seconds.

[0059] The method for preparing the flow parts of the corrosion-resistant Roots vacuum pump from the above-mentioned corrosion-resistant materials is as follows:

[0060] The glass f...

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Abstract

The present invention relates to a method for preparing a corrosion resistant material and a corrosion resistant Roots vacuum pump, which belongs to the technical field of corrosion resistant material and application. The compositions of the ingredients in weight percentage are as follows: 55.8 to 56.7 percent of plumbago, 6.2 to 6.3 percent of fiber glass, 7.5 to 7.9 percent of phenolic resin, and 29.4 to 30.1 percent of wetting agent; and a coupling agent, an accelerant, a thinner and a parting agent are added additionally. The method comprises the following steps: adding the plumbago to be uniformly stirred after mixing phenolic resin with accelerant, and preparing the mixture into a premix for standby; sufficiently stirring the wetting agent, the thinner, the coupling agent and the parting agent to be prepared into liquid cement, and then orderly adding the fiber glass and the premix to knead, and obtaining a preparation material after natural air drying; and heating a mould, loading materials into the mould, matching the mold, keeping the temperature and pressure after pressurizing at a temperature of between 160 and 180 DEG C, then decompressing and unloading the mold, and obtaining part products after natural cooling, thereby obtaining a overflowing part of the Roots vacuum pump. The corrosion resistant material has good corrosion resistance, the prepared corrosion resistant Roots vacuum pump has the advantages of good integrity, no delaminating phenomena, good corrosion resistance, long service life, and low cost.

Description

Technical field [0001] The invention relates to a method for preparing a corrosion-resistant material and a corrosion-resistant Roots vacuum pump, and belongs to the technical field of corrosion-resistant materials and applications. Background technique [0002] In industry, equipment in many fields is exposed to corrosive media, which directly affects the service life of equipment or related components. Such as Roots vacuum pump, Roots vacuum pump, also known as mechanical booster pump, is a positive displacement vacuum pump, which uses a pair of three-bladed or "8" shaped rotors to rotate in the pump cavity at a constant speed and reverse rotation to produce suction and Exhaust, its biggest advantage is that it has a higher pumping rate at a lower inlet pressure, but it cannot work alone. It must be matched with the corresponding backing pump to be used as a vacuum unit. The backing pump can be used in the form of a vacuum unit. Water ring vacuum pump, rotary vane vacuum pump o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/06C08K13/04C08K7/14C08K3/04B29C43/58B29B13/02F04C18/14
Inventor 孙建华张世红孙其尧姚善强石广青
Owner 淄博华舜耐腐蚀真空泵有限公司
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