CN102452144A - Casting process of polyurethane elastomer product - Google Patents
Casting process of polyurethane elastomer product Download PDFInfo
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- CN102452144A CN102452144A CN2010105138255A CN201010513825A CN102452144A CN 102452144 A CN102452144 A CN 102452144A CN 2010105138255 A CN2010105138255 A CN 2010105138255A CN 201010513825 A CN201010513825 A CN 201010513825A CN 102452144 A CN102452144 A CN 102452144A
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- polyurethane
- polyurethane elastomer
- container
- elastomer product
- pressure
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Abstract
The invention discloses a casting process of a polyurethane elastomer product, which comprises the following steps: after a liquid polyurethane raw material is cast into a mold, putting the mold in an airtight container; introducing compressed air into the airtight container to pressurize; holding pressure until polyurethane is cured; releasing the pressure inside the container; and demolding. According to the method provided by the invention, the bubble defects of special-shaped small-size cast polyurethane products are overcome, and the appearance of the polyurethane elastomer product is obviously improved.
Description
Technical field
The present invention relates to a kind of pouring technology of polyurethane elastomer goods.
Background technology
The preparation method that Chinese patent CN 1534051A discloses a kind of microporous polyurethane elastomer on October 06th, 2004; Its production stage is following successively: the preparation of (1) performed polymer: excessive polyisocyanates and polyol resin reaction form the prepolymer of end-NCO base; The end of performed polymer-NCO base content is greater than 10% (wt%), and the temperature of maintenance performed polymer is 35-60 ℃; (2) preparation of polyol resin: polyalcohol in (1) and glycol are expanded components such as joining agent, water foaming agent, surfactant and retardance tertiary amine catalyst mix.Wherein the agent of glycol expansion couplet is the 5-30% (wt) of polyalcohol; Retardance tertiary amine catalyst consumption is the 0.1-2% (wt%) of polyalcohol; (3) cast: use the low pressure foaming machine with temperature as 35-60 ℃ performed polymer and polyol resin mixture in proportion after the hybrid reaction, implantation temperature is in the 40-80 ℃ of mould, promptly makes microporous polyurethane elastomer after the slaking.
Chinese patent CN101397400A discloses a kind of pouring technology of endless-track vehicle bogie wheel nano modified urethane elastomer carcass material on 04 01st, 2009; With the proportioning raw material carry out the nano modification performed polymer synthetic after; With the performed polymer vacuum outgas; Then with casting machine with performed polymer and crosslinking agent on request mixed be poured in the mould; On dull and stereotyped press cure machine, pressurize behind the casting complete 5MPa, the 110-120 ℃ of sulfuration of heating, urethane cures forms carcass and bonding with the metal wheel body, finally forms the bogie wheel finished product.
Include cast polyurethane technology in the preparation process of above-mentioned microporous polyurethane elastomer (or goods), cast polyurethane is with casting machine or by hand the liquid polyurethane raw material is poured into curing molding in the mould that is heated to uniform temperature.Urethane raw pours in the mold process can be involved in air; When raw material flows in mould also can mold cavity narrow, sharply air is enclosed at the position of caving in; Therefore special-shaped small size polyurethane elastomer goods very easily produce bubble when pouring into a mould; Especially there are the corner angle goods on thin-gage goods or surface, have a strong impact on product appearance and performance.
Summary of the invention
Technical problem to be solved by this invention is the air blister defect that overcomes special-shaped small size cast urethane elastomer goods, and the pouring technology of a kind of polyurethane elastomer goods that propose.
In order to solve the problems of the technologies described above; The pouring technology of the polyurethane elastomer goods that the present invention proposes, comprise the steps: that the liquid polyurethane raw material is poured into mould after, mould is inserted closed container; Feed pressurized with compressed air in the closed container; And pressurize is removed container inner pressure, the demoulding to urethane cures.
Preferably, in the pouring technology of the above-mentioned polyurethane elastomer goods of the present invention, after the feeding pressurized with compressed air, the pressure in the closed container is more than or equal to 0.5MPa.
With respect to prior art, process of the present invention utilizes compressed-air actuated pressure the bubble compression that produces in the casting process, makes its volume compression invisible to macroscopic view, to overcome the defective that causes because of bubble, improves product appearance.
Description of drawings
Fig. 1 and Fig. 2 are principle schematic of the present invention.
Fig. 3 is the structural representation of polyurethane product.
Wherein: 1 is casting machine; 2 is casting mold; 3 is the pressurizing vessel base; 4 is intake valve; 5 is warm table; 6 is the pressurizing vessel loam cake; 7 is safety valve; 8 is clip; 10 is the container upper cover handle; 11 is pressure regulator valve; 12 is relief valve.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment, further set forth the present invention.These embodiment are interpreted as only being used to the present invention is described and are not used in restriction protection scope of the present invention.After the content of having read the present invention's record, those skilled in the art can do various changes or modification to the present invention, and these equivalences change and modify and fall into claim of the present invention institute restricted portion equally.
As depicted in figs. 1 and 2, in the pouring technology of the polyurethane elastomer goods that the preferred embodiment of the present invention provides, pressurizing vessel base 3 is placed on the warm table 5, and casting mold 2 is placed on the pressurizing vessel base 3, and the liquid polyurethane raw material is poured in the casting mold 2; As shown in Figure 2, the pressurizing vessel loam cake 6 that closes with clip 8 lockings, is opened intake valve 4, regulates pressure regulator valve 11 to required pressure, treats to close intake valve 4 after polyurethane product solidifies, and opens relief valve 12 and remove container inner pressure, opens container, and the demoulding promptly gets product.
In the present embodiment; The function of safety valve 7 is overvoltage protections in the container; (pressurizing vessel air pressure scope: 0-1Mpa when the container inner air pressure surpasses maximum allowable pressure; Maximum allowable pressure 1MPa (wherein maximum allowable pressure is the withstand voltage limit of pressurizing vessel of present embodiment, can obtain bigger air pressure scope through design, the higher pressurizing vessel of manufacturing voltage endurance capability), safety valve 7 is opened exhaust pressure relief automatically.
As shown in Figure 3, the casting process parameters of polyurethane product (outer dia 68mm, inside diameter 42mm, height 19mm) is following: mold temperature: 110 ℃; Hardening time 30min, wherein:
Test Example 1: adopt common pouring type
Test Example 2: adopt the pouring type of pressurization, container inner pressure is set 0.2Mpa
Test Example 3: adopt the pouring type of pressurization, container inner pressure is set 0.5Mpa
Test Example 4: adopt the pouring type of pressurization, container inner pressure is set 0.7MPa
Result of the test shows, adopts common pouring type (Test Example 1), and the property at parts of edges and corners of product, pictorial trademark and literal position and thin-walled position produce bubble, can't eliminate, and have a strong impact on product appearance.
Adopt to feed compressed-air actuated mode (Test Example 3-4), when container inner pressure setting >=0.5MPa,, product surface does not have obvious visible bubble in bubble, and presentation quality significantly improves.Result of the test is as shown in table 1.
The result of the test of table 1. Test Example 1-4
| Project | Test Example 1 | Test Example 2 | Test Example 3 | Test Example 4 |
| Blibbing quantity | ?19 | ?6 | No visible bubble in bubble | No visible bubble in bubble |
| Largest air bubbles diameter (mm) | ?1.8 | ?0.5 | - | - |
Claims (2)
1. the pouring technology of polyurethane elastomer goods is characterized in that, after the liquid polyurethane raw material is poured into mould, mould is inserted closed container, feeds pressurized with compressed air in the closed container, and pressurize is removed container inner pressure, the demoulding to urethane cures.
2. the pouring technology of polyurethane elastomer goods according to claim 1 is characterized in that, the pressure in the closed container is >=0.5MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105138255A CN102452144A (en) | 2010-10-21 | 2010-10-21 | Casting process of polyurethane elastomer product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105138255A CN102452144A (en) | 2010-10-21 | 2010-10-21 | Casting process of polyurethane elastomer product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102452144A true CN102452144A (en) | 2012-05-16 |
Family
ID=46036022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105138255A Pending CN102452144A (en) | 2010-10-21 | 2010-10-21 | Casting process of polyurethane elastomer product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102452144A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113801289A (en) * | 2021-10-20 | 2021-12-17 | 株洲时代新材料科技股份有限公司 | High-hardness polyurethane blade material and preparation method of blade |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87104799A (en) * | 1986-12-25 | 1988-07-06 | 株式会社人类工业 | Polyurethane foam production method and apparatus |
| CN1043463A (en) * | 1988-11-02 | 1990-07-04 | 国家研究发展公司 | Molded and the packing of contact lenses |
| FR2723334A1 (en) * | 1994-08-05 | 1996-02-09 | Volpi Marie Rose | Cast resin body parts for heating appliances |
| CN1534051A (en) * | 2003-03-28 | 2004-10-06 | 上海凯众聚氨酯有限公司 | Polyurethane microporous elastic body production method |
| JP2006281618A (en) * | 2005-03-31 | 2006-10-19 | Hoya Corp | Method and device for injecting plastic raw material and plastic lens |
-
2010
- 2010-10-21 CN CN2010105138255A patent/CN102452144A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87104799A (en) * | 1986-12-25 | 1988-07-06 | 株式会社人类工业 | Polyurethane foam production method and apparatus |
| CN1043463A (en) * | 1988-11-02 | 1990-07-04 | 国家研究发展公司 | Molded and the packing of contact lenses |
| FR2723334A1 (en) * | 1994-08-05 | 1996-02-09 | Volpi Marie Rose | Cast resin body parts for heating appliances |
| CN1534051A (en) * | 2003-03-28 | 2004-10-06 | 上海凯众聚氨酯有限公司 | Polyurethane microporous elastic body production method |
| JP2006281618A (en) * | 2005-03-31 | 2006-10-19 | Hoya Corp | Method and device for injecting plastic raw material and plastic lens |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113801289A (en) * | 2021-10-20 | 2021-12-17 | 株洲时代新材料科技股份有限公司 | High-hardness polyurethane blade material and preparation method of blade |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 201201 No. 813 Jianye Road, Shanghai, Pudong New Area Applicant after: SHANGHAI CARTHANE CO., LTD. Address before: 201201 No. 813 Jianye Road, Shanghai, Pudong New Area Applicant before: Shanghai Kaizhong Polyurethane Co., Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: SHANGHAI KAIZHONG POLYURETHANE CO., LTD. TO: SHANGHAI CARTHANE CO., LTD. |
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120516 |