High-breathability alcohol-based evaporative pattern coating and preparation method thereof
An air permeability and lost foam technology, applied in coatings, manufacturing tools, casting and molding equipment, etc., can solve the problems of unsatisfactory air permeability of lost foam coatings and affect the performance of castings, and achieve good suspension stability, low cost, enhanced The effect of breathability
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[0020] The preparation method of the high air permeability alcohol-based lost foam coating of the present invention is implemented according to the following steps:
[0021] Step 1. Weigh the raw materials
[0022] Weigh the following raw materials according to mass percentage: alcohol-based solvent (one or two combinations of methanol, ethanol, and isopropanol) 20% to 40%; 0.5% to 5% of polyvinyl formal and 0.5% to 5% of silica sol; 0.5% to 5% of organic montmorillonite; 0.05% to JFC 0.2%; polyurethane foam microbeads or expandable polymethyl methacrylate microbeads 0.1-1%, total 100%;
[0023] Step 2. Preparation of highly air-permeable alcohol-based lost foam coating
[0024] 2.1) According to the mass ratio of 1:1, mix and stir the organic montmorillonite weighed in step 1 and the alcohol-based solvent for 30-40 minutes to obtain mixture A, seal and stand for 24 hours before use;
[0025] 2.2) According to the mass ratio of 1:1, mix and stir the polyvinyl formal and sil...
Embodiment 1
[0030] Step 1. Weigh the following raw materials according to mass percentage: 25% ethanol; 60% pearl sand; 5% polyvinyl formal and 5% silica sol; 4.8% organic montmorillonite; 0.1% JFC; polyurethane foam beads Granules 0.1%, total 100%.
[0031] Among them, the refractory aggregate pearl sand particle size is about 200 mesh; the polyurethane foam micro-bead particle size is about 0.05mm.
[0032] Step 2. Preparation of highly air-permeable alcohol-based lost foam coating
[0033] 2.1) According to the mass ratio of 1:1, the organic montmorillonite weighed in step 1 and the alcohol-based solvent were mixed and stirred for 30 minutes to obtain mixture A, which was sealed and left for 24 hours for later use;
[0034] 2.2) According to the mass ratio of 1:1, mix and stir the polyvinyl formal and silica sol weighed in step 1 with an alcohol-based solvent for 20 minutes to obtain a mixture B, which is sealed and stored for later use;
[0035] 2.3) Pour the remaining alcohol-based...
Embodiment 2
[0039] Step 1. Weigh the following raw materials according to mass percentage: methanol 35%; zircon powder 54%; polyvinyl formal 3.5% and silica sol 3.3%; organic montmorillonite 3.5%; JFC 0.2%; foamable Polymethyl methacrylate microbeads 0.5%, total 100%.
[0040] Among them, the particle size of refractory aggregate zircon powder is about 250 mesh; the particle size of foamable polymethyl methacrylate microbeads is about 0.2mm.
[0041] Step 2. Preparation of highly air-permeable alcohol-based lost foam coating
[0042] 2.1) According to the mass ratio of 1:1, the organic montmorillonite weighed in step 1 and the alcohol-based solvent were mixed and stirred for 35 minutes to obtain mixture A, which was sealed and left for 24 hours for later use;
[0043] 2.2) According to the mass ratio of 1:1, mix and stir the polyvinyl formal and silica sol weighed in step 1 with an alcohol-based solvent for 25 minutes to obtain a mixture B, which is sealed and stored for later use;
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