CN101774241A - Method for detecting and removing air tightness defect of epoxy resin mould - Google Patents
Method for detecting and removing air tightness defect of epoxy resin mould Download PDFInfo
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- CN101774241A CN101774241A CN201010028154A CN201010028154A CN101774241A CN 101774241 A CN101774241 A CN 101774241A CN 201010028154 A CN201010028154 A CN 201010028154A CN 201010028154 A CN201010028154 A CN 201010028154A CN 101774241 A CN101774241 A CN 101774241A
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- epoxy resin
- resin mould
- fluoride polyurethane
- mould
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Abstract
The invention discloses a method for detecting and removing the air tightness defect of an epoxy resin mould. The method comprises the following steps of: uniformly stirring 80 to 100 parts of fluorinated polyurethane emulsion, 8 to 10 parts of curing agent and 20 to 30 parts of diluent into a fluorinated polyurethane aphotic enamel paint; putting the diluted fluorinated polyurethane aphotic enamel paint in a paint spray gun, and uniformly spraying the paint on the surface of the epoxy resin mould; standing for 12 hours, observing the micropore defect on the surface of the epoxy resin mould under good light; and drilling a pit with the diameter no more than phi 6mm in a micropore defect part, filling up the pit by epoxy resin, sanding the surface, and spraying the diluted fluorinated polyurethane aphotic enamel paint. The method is simple, convenient and rapid, and has low cost; and the micropore defect on the surface of the epoxy resin mould can be rapidly found and removed, the surface hardness of the mould can be improved, and the service life of the mould can be prolonged.
Description
Technical field
The invention relates to and detect and eliminate the method that epoxy resin mould influences bubble-tight little gas hole defect.
Background technology
At present to adopt magnetic suspension train vehicle body, the headstock covering of composite manufacturing all be 2 meters of minimum dimensions, vacuumizes die forming on the large mold that full-size is 12 meters.And the typical structure of mould is steel skeleton pedestal+fiberglass body+epoxy resin profile.For guaranteeing the composite material parts forming quality, generally the vacuum-tightness to mould requires very high.Give birth to thermogenetic gas yet the bonding agent between the fiberglass body epoxy resin profile, air that existence can't thoroughly be eliminated and epoxy resins solidify, cause existing in the mould piconet shape gas circuit, make its surface have little gas hole defect.Because the existence of little pore makes the air-tightness of mould be difficult to be guaranteed.Bubble-tight little gas hole defect if eliminate the effects of the act then must be found its position, quantity and distribution situation.Prior art normally adopts pressure-air air blast, colored liquid infusion method, magnifying glass observation in order to address this problem.These methods can not fundamentally be eliminated these miniature gas hole defects owing to can not thoroughly find the issue situation of little pore.
Summary of the invention
Task of the present invention provide a kind of simply, easily and fast, low cost, can fast detecting also eliminate little gas hole defect that the epoxy resin mould surface exists, and can improve the method for die surface quality and die life.
Purpose of the present invention can reach by following measure: a kind of method that detects and eliminate epoxy resin mould air-tightness defective is characterized in that comprising the steps:
(a) with 80-100 part fluoride polyurethane emulsion, 8-10 part curing agent, 20-30 part diluent evenly stirs into the fluoride polyurethane mat enamel; Then
(b) will dilute good fluoride polyurethane mat enamel and put into paint sprayer, with its evenly be sprayed on epoxy resin mould get surperficial on;
(c) place after 12 hours, well locate to observe the little gas hole defect in epoxy resin mould surface at light;
(d) bore the pit that the system diameter is not more than Φ 6mm at little gas hole defect place, fill and lead up with epoxy resin, the sanding surface sprays the good fluoride polyurethane mat enamel of above-mentioned dilution again.
Beneficial effect of the present invention is, fluoride polyurethane emulsion mat enamel good penetrability, can immerse and form miniature pit in the little pore of epoxy resin surface, under good light, can clearly observe the position, quantity, distribution situation of miniature gas hole defect etc., for find and eliminate little gas hole defect that epoxy resin surface exists provide simply, easily and fast, low cost method.Fluoride polyurethane emulsion mat enamel hardness is higher than epoxy resin, is difficult for being scratched, and can significantly improve die surface quality and service life, more can guarantee the mould air-tightness, but also has correspondingly improved the surface quality of composite material skin workpiece.Fluoride polyurethane emulsion mat enamel temperature tolerance has prolonged the service life of mould than epoxy resin height.During large-scale, the super-huge epoxy resin mould of the present invention's cover surplus magnetic suspension 10 is made, all adopt this method to find and eliminated the bubble-tight little gas hole defect of influence, be the hundreds thousand of units of magnetic suspension train vehicle body development cost saving, the speed production cycle is more than one month.
The inventive method not only can be used for large-scale, the super-huge epoxy resin mould manufacturing that has air-tightness to require, and can also be used for large-scale, the super-huge epoxy resin mould manufacturing that aerospace field has air-tightness to require.
Specific implementation method
Embodiment 1
The fluoride polyurethane mat enamel can be by following component and dilution proportion: 100 parts of TS96-71 fluoride polyurethane emulsions, and 10 parts of lacquer curing agent, 30 parts of diluents, stirring forms.During use, can paint spray gun, the fluoride polyurethane mat enamel that dilution is good is put into paint sprayer, with the fluoride polyurethane mat enamel evenly be sprayed on epoxy resin mould get surperficial on, evenly spray the coating of thick about 0.1mm.Place and well locate to observe the epoxy resin mould surface condition at light after 12 hours, with pneumatic drill at the drill diameter Φ 6mm of little gas hole defect place, pit about dark 5mm, fill and lead up with epoxy resin then, treat sanding surface behind the epoxy resin cure, again the spraying fluoride polyurethane mat enamel that dilution is good according to the above ratio and check whether little gas hole defect is all eliminated.If also have little gas hole defect, then cycling is as stated above all eliminated up to defective, sprays twice at last again to improve reliability.
Embodiment 2
With 90 parts of TS96-71 fluoride polyurethane emulsions, 10 parts of curing agent, 30 parts of diluents evenly stir into the fluoride polyurethane mat enamel; To dilute good fluoride polyurethane mat enamel then and put into paint sprayer, evenly be sprayed on epoxy resin mould get surperficial on; Thick about 0.2mm, place and well locate at light after 10-12 hour, observe the epoxy resin mould surface condition, with pneumatic drill at the drill diameter Φ 5mm of little gas hole defect place, pit about dark 4mm is filled and led up with epoxy resin then, treats sanding surface behind the epoxy resin cure, good fluoride polyurethane mat enamel is diluted in spraying according to the above ratio again, and checks whether little gas hole defect is all eliminated.If also have little gas hole defect, then cycling is as stated above all eliminated up to defective, sprays twice at last again to improve reliability.
It is phenol, ethylenediamine, formaldehyde that described curing agent can adopt raw material, and its mixing through thermal dehydration, is added flexibilizer, diluent gets the finished product curing agent again.Diluent can adopt the acroleic acid polyurethane diluent,
Described polyaminoester emulsion can be used toluene 2,4-vulcabond (TDI), dihydromethyl propionic acid (DMPA), cetomacrogol 1000 (PEG1ooo), hydroxyethyl methacrylate raw materials such as (HEMA) make the aqueous polyurethane PU of carbon-carbon double bonds, with acrylic acid octafluoro pentyl ester (OFBA) copolymerization taking place, makes fluorine-containing aqueous polyurethane emulsion again.Test result shows: there is lower polarity on the surface of fluorochemical urethane emulsion film, and polyester soft segment is easier to the film surface migration under the room temperature.Fluoride polyurethane emulsion fluoropolymer polymer has good solvent resistance, resistance to water, oil resistivity and pollution resistance.In addition, on the polyurethane molecular chain, introduce fluoro-containing group make the method for fluoride polyurethane emulsion have several, as adopting PFPE dihydroxylic alcohols, polyether Glycols, being polymerized with vulcabond, small molecule chain extender etc.But it is all poor that short chain is fluoridized glycol or fluoridized the flexibility and the dissolubility of the synthetic polyurethane of vulcabond.Also can adopt the glycidol ether of perfluor alcohol and toluene and the fluorinated polyurethane of isocyanates (TDI) preparation.Can also adopt perfluor vulcabond and dihydroxylic alcohols to carry out polymerization and prepare the fluorochemical urethane emulsion.The introducing of fluorine element has strengthened the water-fast oil repellent of polyurethane film greatly, and chemical-resistant has improved the hot property of polyurethane simultaneously; The fluorine chain is long more, and the surface property of polyurethane is good more, and hot property, chemical-resistant are good more.
Claims (5)
1. a method that detects and eliminate epoxy resin mould air-tightness defective is characterized in that comprising the steps:
(a) with 80-100 part fluoride polyurethane emulsion, 8-10 part curing agent, 20-30 part diluent evenly stirs into the fluoride polyurethane mat enamel; Then
(b) will dilute good fluoride polyurethane mat enamel and put into paint sprayer, with its evenly be sprayed on epoxy resin mould get surperficial on;
(c) place after 12 hours, well locate to observe the little gas hole defect in epoxy resin mould surface at light;
(d) bore the pit that the system diameter is not more than Φ 6mm at little gas hole defect place, fill and lead up with epoxy resin, the sanding surface sprays the good fluoride polyurethane mat enamel of above-mentioned dilution again.
2. kind as claimed in claim 1 detects and eliminates the method for epoxy resin mould air-tightness defective, it is characterized in that described fluoride polyurethane emulsion is a TSX-71 fluoride polyurethane emulsion.
3. kind as claimed in claim 1 or 2 detects and eliminates the method for epoxy resin mould air-tightness defective, it is characterized in that, described fluoride polyurethane mat enamel is by 90 parts of fluoride polyurethane emulsions, 10 parts of curing agent, and 30 parts of diluents stir and form.
4. kind as claimed in claim 1 detects and eliminates the method for epoxy resin mould air-tightness defective, it is characterized in that, the epoxy resin mould surface evenly fluoride polyurethane emulsion mat enamel bed thickness of spraying is 0.1mm.
5. kind as claimed in claim 1 detects and eliminates the method for epoxy resin mould air-tightness defective, it is characterized in that, pneumatic drill bores system at little gas hole defect place pit is diameter of phi 6mm, dark 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010028154A CN101774241A (en) | 2010-01-20 | 2010-01-20 | Method for detecting and removing air tightness defect of epoxy resin mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010028154A CN101774241A (en) | 2010-01-20 | 2010-01-20 | Method for detecting and removing air tightness defect of epoxy resin mould |
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| Publication Number | Publication Date |
|---|---|
| CN101774241A true CN101774241A (en) | 2010-07-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201010028154A Pending CN101774241A (en) | 2010-01-20 | 2010-01-20 | Method for detecting and removing air tightness defect of epoxy resin mould |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166597A (en) * | 2010-12-07 | 2011-08-31 | 成都飞机工业（集团）有限责任公司 | Large composite material skinned die and manufacturing method thereof |
| CN104360044A (en) * | 2014-11-13 | 2015-02-18 | 廊坊立邦涂料有限公司 | Method for detecting automobile paint shrinkage cavity |
-
2010
- 2010-01-20 CN CN201010028154A patent/CN101774241A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166597A (en) * | 2010-12-07 | 2011-08-31 | 成都飞机工业（集团）有限责任公司 | Large composite material skinned die and manufacturing method thereof |
| CN104360044A (en) * | 2014-11-13 | 2015-02-18 | 廊坊立邦涂料有限公司 | Method for detecting automobile paint shrinkage cavity |
| CN104360044B (en) * | 2014-11-13 | 2015-12-02 | 廊坊立邦涂料有限公司 | A kind of automobile coating shrinkage cavity detection method |
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Application publication date: 20100714 |