One tank paint makeup process using a recirculation loop with liquid injection
AssigneeE. I. Du Pont de Nemours and Company
InventorsPeter M. Clinton, Nathan Cloud, Frank Rohrbacher
Life of this patent
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Abstract
Paint compositions useful for automotive applications are made using a one tank process with an associated circulation loop. Addition ports located in close proximity to a zone of high speed mixing allows for rapid blending of materials into the process stream. A bypass subloop connected to the circulation loop will divert paint to grinding apparatus achieve addition of pigments on-line. Instrumentation attached to the circulation loop directly measures the process stream parameters such as viscosity, pH, temperature, and pressure.
Claims3
An in-line process for preparing automotive finish comprising multi-staged introductions of materials including millbase, resins, dispersions, and solvents comprising the steps of
- (a) introducing a first group of materials selected from the group consisting of millbase, resins, dispersions, solvents, and pigments into a processing vessel having mixing means therein,
- (b) feeding said materials from an outlet port in said processing vessel to a circulation loop which extends from said processing vessel and returns to said processing vessel, said circulation loop having attached thereto a mixer having a rotor cooperating with a stator to produce a moderate shear mixing zone and at least one port discharging directly into the moderate shear mixing zone,
- (c) feeding additional materials into said circulation loop through said port,
- (d) passing all of the materials in said circulation loop through the moderate shear mixing zone in said circulation loop,
- (e) filtering all of the materials, and
- (f) recovering a finish having a uniform coloration from said circulation loop.
An in-line process for preparing automotive finish comprising multi-staged introductions of materials including millbase, resins, dispersions, and solvents comprising the steps of
- (a) introducing a first group of materials selected from the group consisting of millbase, resins, dispersions, solvents and pigments into a processing vessel having mixing means therein,
- (b) feeding said materials from an outlet port in said processing vessel to a circulation loop, said circulation loop having attached thereto a mixer having a rotor cooperating with a stator to produce a moderate shear mixing zone and at least one port discharging directly into the moderate shear mixing zone,
- (c) feeding additional materials into said circulation loop through said port,
- (d) passing all of the materials in said circulation loop through the moderate shear mixing zone in said circulation loop,
- (e) circulating said materials to a subloop tubulary connected to said circulation loop by a value, said subloop having an in-line agitated media mill to further mix said materials are said materials pass through the mill and are returned to said circulation loop, and
- (f) recovering a finish having a uniform coloration from said circulation loop.
Dependencies are inferred from the claim text.