A kind of wear-resistant spray polyurethane resin composition and its preparation method and construction method
A technology for spraying polyurethane and resin composition, applied in the direction of coating, device for coating liquid on the surface, etc., can solve the problems of short service life, poor wear resistance, easy foaming, etc., and achieve low wear and good construction technology. Effect
Active Publication Date: 2016-08-17
LIMING RES INST OF CHEM IND
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Problems solved by technology
[0005] Aiming at the shortcomings of existing sprayed polyurethane resins in high-humidity environment, which are easy to foam, bulge, have poor wear resistance and short service life, the first technical problem to be solved by the present invention is to provide a wear-resistant sprayed polyurethane resin composition, which The product can be applied in an environment with a relative humidity greater than 70% without foaming
Method used
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[0033] The present invention will be further described below in conjunction with embodiment.
[0034] The preparation process in the specific embodiment is as follows:
[0035] (1) Preparation of component A:
[0036] Add the raw materials shown in Table 1 into the reactor, and react at 75-80°C for 2 hours in a nitrogen atmosphere to obtain component A.
[0037] (2) Preparation of component B:
[0038] Add the raw materials shown in Table 2 into the reactor and mix them evenly to obtain component B.
[0039] The raw materials used in Examples 1-5 and Comparative Examples are shown in Table 1 and Table 2. The main raw material codes are as follows:
[0040] MDI: diphenylmethane diisocyanate;
[0041] MDI-50: diphenylmethane diisocyanate (4,4'-, 2,4' isomers account for 50% each)
[0042] TDI: toluene diisocyanate;
[0043] PTMEG-1000: Polytetramethylene ether glycol, relative molecular weight 1000±50;
[0044] PTMEG-650: Polytetramethylene ether glycol, relative molecul...
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Abstract
The invention discloses a wear-resistant spraying polyurethane resin composition, and a preparation method and construction method thereof. The composition comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 35-70% of polymer polyalcohol A, 3-9% of plasticizer and 25-60% of isocyanate; the NCO / OH mole ratio is 1.5-5.72; the component B comprises the following components in parts by mass: 13-30% of organic amine curing agent, 0-75% of plasticizer, 0-80% of polymer polyalcohol B and 0.1-1% of catalyst; and the volume ratio of the component A to the component B is 100 / 50-100 / 100. The composition is suitable for high-pressure spraying and static mixed spraying, can be sprayed at room temperature or under heating conditions, is not sensitive to humidity, and can not have the phenomenon of foaming or bulging even in an environment with the relative humidity of higher than 70% or on a wet base surface basal plane or under the condition of construction in rainy days, thereby achieving the effect of spraying polyurea. The obtained coating has favorable wear resistance.
Description
technical field [0001] The invention relates to the field of polyurethane spraying, in particular to a preparation and construction method of an abrasion-resistant polyurethane coating. Background technique [0002] Iron ore has a lot of lean ore and comprehensive ore with other components, and the hardness of the ore is relatively high. The drum skin of the magnetic separator is constantly impacted and worn by granular iron ore below 0-15mm in use. Seriously, the magnetic drum skin is often worn out by the ore in the magnetic separator. Once the shell is worn through, the ore slurry will enter the magnetic drum and be adsorbed on the surface of the magnetic system, resulting in a lock between the shell and the magnetic system, or the slurry will enter the bearing and cause bearing damage. The magnetic system is the heart of the magnetic separator equipment. When the magnetic system is damaged, the entire magnetic separation equipment will be paralyzed. It is very important...
Claims
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IPC IPC(8): C09D175/08C09D175/06C09D7/12C08G18/66C08G18/48C08G18/42C08G18/22B05D7/24
Inventor 周文英陈战有张利军韦永继
Owner LIMING RES INST OF CHEM IND