CN1045941A - Sectional cure process for thermosetting plastic - Google Patents
Sectional cure process for thermosetting plastic Download PDFInfo
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- CN1045941A CN1045941A CN 89101980 CN89101980A CN1045941A CN 1045941 A CN1045941 A CN 1045941A CN 89101980 CN89101980 CN 89101980 CN 89101980 A CN89101980 A CN 89101980A CN 1045941 A CN1045941 A CN 1045941A
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Abstract
Sectional cure process for thermosetting plastic.The present invention relates to thermoset plastic forming technology, it with the curing molding process of product be divided into different temperatures such as high-temperature molding, intermediate temperature setting and low temperature stress relieving the processing stage finish, shorten 5～6 times of press times than existing technology, not only improved production efficiency, and guaranteed that product has good fineness and indeformable, yield rate height, good product quality have reduced waste of material, have reduced cost.
Description
The present invention relates to the thermosetting plastics cure process.
The thermosetting plastics goods are with premium properties such as its intensity height, hear resistance and fineness is good and obtain more and more widely application.But, for a long time, exist two problems on the production technology of thermosetting plastics goods: the first is because thermoset plastic forming curing required time is longer, the general product section thickness of pressing calculates, and every millimeter wall thickness needs 1～1.5 minute hardening time, and in existing production technology, the whole solidification process of product is all finished in mould, so product often needs to keep a few minutes even the longer time could the demoulding in mould, production efficiency is difficult to improve; It two is by existing production technology, and product cools off after the solidification process and the demoulding and is easy to generate internal stress, causes distortion, and the percent defective height causes raw-material significant wastage, and particularly complex-shaped or section thickness changes goods greatly, easier appearance distortion.
The objective of the invention is existing thermoset plastic forming technology is made improvements, a kind of sectional cure process for thermosetting plastic is provided, to solve the existing the problems referred to above of prior art.
The solidification temperature of thermosetting plastics (for example phenoplasts, urea-formaldehyde plastics and melamine urea-formaldehyde plastics etc.) is generally 80～190 ℃, and in this temperature range, hot setting is fast, and the curing molding required time is short, and fineness is good, but degree of deformation is big; Low-temperature setting is slow, and the curing molding required time is long, and fineness is poor, but is out of shape little.The present invention is according to the above-mentioned characteristic of thermosetting plastics, the stage that product one step completed solidification process in mould in the existing thermoset plastic forming processing technology is improved to the branch different temperatures finishes, and promptly solidification process generally comprises high-temperature molding and two stages of intermediate temperature setting.High-temperature molding is to select its highest suitable bearing temperature (general higher about 20 ℃ than the press temperature that has the same material that technology uses) as press temperature according to material therefor, the product surface is fast curing-formed when making compacting, the time that shortening stops in mould, enhance productivity, and make product reach surface of good fineness; Intermediate temperature setting is (to be the surface cure moulding during because of the product demoulding with the product after the demoulding through shaping, its shape also has certain plasticity, may produce alteration of form owing to the traction action of mould during the demoulding, so tackled product before the stage and carry out shaping entering intermediate temperature setting, make it recover shape in mould.) in normal temperature, lower the temperature, under than the low temperature of compacting temperature, be incubated then, make product reach complete curing molding, intermediate temperature setting can make product reduce the production of internal stress, reduces the distortion of product to greatest extent.
For complex-shaped or section thickness difference in change apart from big or elongated product, maybe when to the product dimension precision requirement when higher, in order to guarantee that product is indeformable and geomery is accurate, can intermediate temperature setting after the stage again to product increase low temperature stress relieving phase process.Low temperature stress relieving is to be incubated processing under lower temperature through the product behind the intermediate temperature setting, to eliminate the internal stress that product exists, makes product reach indeformable.
Process conditions processing stage of below to each of sectional cure process for thermosetting plastic of the present invention specify.The press temperature in high-temperature molding stage is generally 140～190 ℃, in this temperature range, according to the material therefor difference, press temperature is also different, for example when material therefor is phenoplasts, press temperature is generally 160～190 ℃, and when material therefor was aminoplast (for example melamine urea-formaldehyde plastics, urea-formaldehyde plastics etc.), press temperature was generally 140～170 ℃; The press temperature of commaterial (i.e. the highest bearing temperature) also can be different different because of material model difference, manufacturer's difference or lot number, so, the press temperature that the high-temperature molding stage in the technology of the present invention is adopted generally needs to determine by actual tests according to used concrete material.Concrete grammar is: the press temperature commonly used with the same kind material of material therefor is suppressed, and the selected press time (generally selecting in the scope) at 30～65 seconds, splitting cruelly appears in product after the demoulding, illustrate that press temperature is higher, should suitably turn down that the product surface cure is not enough after the demoulding, swelling, foaming appear, illustrate that press temperature is on the low side, should suitably heighten, adjust through several times like this and can determine suitable press temperature; The press time of high-temperature molding (being the time that product keeps in mould) was generally 30～65 seconds, in general, the press temperature height, then the press time short relatively, the press time is low, then the press time is longer relatively, in addition, the product section thickness is big, and the required press time is also longer, section thickness is little, and the then required press time is shorter.The temperature that the intermediate temperature setting stage adopts is generally 80～120 ℃ (the most frequently used temperature is 90～100 ℃), and temperature retention time is pressed the product section thickness and calculated, and general every millimeter section thickness need be incubated 1～1.5 minute.The temperature in low temperature stress relieving stage is 60～70 ℃, and temperature retention time was generally 3～5 minutes.
Two stages of intermediate temperature setting and low temperature stress relieving generally can carry out in incubator.
Sectional cure process for thermosetting plastic of the present invention other process conditions except that above-mentioned are identical with existing similar technology.
Be an example of the present invention below:
Material therefor is that (plastic molding and processing plant produces the melamine urea-formaldehyde plastics in the south, Guangzhou, model A3) the product section thickness is 6.5 millimeters, press temperature is 165～170 ℃, 60～65 seconds press times, be incubated 6～7 minutes after the demoulding shaping in 90～100 ℃ of incubators and make product reach complete curing molding, put in 60～70 ℃ the cryogenic box again and be incubated 4～5 minutes, the products obtained therefrom size is accurate, be out of shape little, the yield rate height.
Sectional cure process for thermosetting plastic of the present invention is compared with existing technology, the product press time shortens 5～6 times, for example section thickness is 6.5 millimeters product, needed approximately 6.5 minutes just can open one-off pattern with existing technology, and adopt technology of the present invention only to need to open one-off pattern 60～65 seconds, can enhance productivity 5～6 times; Technology of the present invention has not only improved production efficiency, and by adopting the different temperatures phase process, has guaranteed that product has good surface smoothness and indeformable, yield rate height, good product quality, and can reduce waste of material, reduce cost.
Claims (4)
1, a kind of sectional cure process for thermosetting plastic, the curing molding that it is characterized in that product be by high-temperature molding and two different temperatures of intermediate temperature setting the processing stage finish.
2, according to the described technology of claim 1, it is characterized in that product after intermediate temperature setting is handled, remake low temperature stress relieving and handle.
3, according to claim 1 or 2 described technologies, it is characterized in that said high-temperature molding is to select its highest bearing temperature that is suitable for to suppress as press temperature according to material therefor, press temperature is 140～190 ℃, product suppresses in mould that to reach the surface cure moulding in 30～60 seconds be the demoulding, said intermediate temperature setting is 80～120 ℃ of insulations after the product demoulding, product is solidified fully, temperature retention time is every millimeter section thickness 1～1.5 minute, and said low temperature stress relieving is that the product that will handle through intermediate temperature setting is incubated 3～5 minutes at 60～70 ℃.
4, according to the described technology of claim 3, it is characterized in that when material therefor is phenoplasts press temperature is 160～190 ℃, when material therefor was aminoplast, press temperature was 140～170 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101980 CN1045941A (en) | 1989-03-27 | 1989-03-27 | Sectional cure process for thermosetting plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101980 CN1045941A (en) | 1989-03-27 | 1989-03-27 | Sectional cure process for thermosetting plastic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1045941A true CN1045941A (en) | 1990-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89101980 Pending CN1045941A (en) | 1989-03-27 | 1989-03-27 | Sectional cure process for thermosetting plastic |
Country Status (1)
| Country | Link |
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| CN (1) | CN1045941A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100339163C (en) * | 2003-03-18 | 2007-09-26 | 日本油漆株式会社 | Method for producing composite coating |
| CN102286156A (en) * | 2011-01-19 | 2011-12-21 | 江苏宝亨新电气有限公司 | Large-capacity dry-type transformer curing process |
-
1989
- 1989-03-27 CN CN 89101980 patent/CN1045941A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100339163C (en) * | 2003-03-18 | 2007-09-26 | 日本油漆株式会社 | Method for producing composite coating |
| CN102286156A (en) * | 2011-01-19 | 2011-12-21 | 江苏宝亨新电气有限公司 | Large-capacity dry-type transformer curing process |
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| RJ01 | Rejection of invention patent application after publication |