CN115122562A - Epoxy resin inflation foaming device and foaming method thereof - Google Patents
Epoxy resin inflation foaming device and foaming method thereof Download PDFInfo
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- CN115122562A CN115122562A CN202210737693.7A CN202210737693A CN115122562A CN 115122562 A CN115122562 A CN 115122562A CN 202210737693 A CN202210737693 A CN 202210737693A CN 115122562 A CN115122562 A CN 115122562A
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- epoxy resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/60—Measuring, controlling or regulating
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Abstract
The invention relates to the technical field of inflation foaming, and provides an epoxy resin inflation foaming device and a foaming method thereof, wherein the inflation foaming device comprises a box body, a feeding body, an air compressor and an air pressure gauge, and the side wall of the box body is respectively provided with a feeding valve and an air supply valve; the feeding pump body is respectively connected with an external material source and a feeding valve; the air compressor is respectively connected with an external air source and an air supply valve; the barometer is arranged in the box body and used for monitoring the air pressure in the box body. The invention forms uniformly distributed air holes in the epoxy resin composite material to improve the residual stress generated by nonuniform curing, and simultaneously improves the stability and reliability of the product on the premise of keeping various performances of the obtained composite material.
Description
Technical Field
The invention relates to the technical field of inflation foaming, in particular to an epoxy resin inflation foaming device and a foaming method thereof.
Background
The epoxy resin composite material has excellent dielectric property, mechanical strength, environmental resistance and adhesive property, so that the epoxy resin composite material is increasingly widely applied to the fields of electric and electronic insulating materials, traffic, aerospace and the like. However, the epoxy resin curing and molding process is accompanied by complicated changes such as curing heat release, filler settlement, multiphase heat transfer and the like, so that the cured product is easy to have the problems of uneven temperature distribution, large internal residual stress and the like, and the product is degraded in performance and even fails in engineering application.
Disclosure of Invention
The invention aims to provide an epoxy resin inflation foaming device and a foaming method thereof, which can form uniformly distributed air holes in an epoxy resin composite material to improve the residual stress generated by nonuniform curing of the epoxy resin composite material and improve the stability and reliability of a product on the premise of keeping various performances of the obtained composite material.
In order to solve the above technical problems, the present invention provides an epoxy resin inflation foaming device and a foaming method thereof, comprising:
the side wall of the box body is provided with a feeding valve and an air supply valve respectively;
the feeding pump body is respectively connected with an external material source and a feeding valve;
the air compressor is respectively connected with an external air source and an air supply valve;
the air pressure gauge is arranged in the box body and used for monitoring the air pressure in the box body.
Preferably, a mixing box is arranged between the feed valve and the feed pump body.
Preferably, the air compressor has power of 3000W, exhaust gas volume of 240L/min, volume of 100L, voltage of 220V, net weight of 77kg, maximum pressure of 0.7MPa, external dimensions of 1190mm in length, 430mm in width and 700mm in height.
Preferably, the working environment temperature of the barometer is-40-70 ℃.
Preferably, the internal dimensions of the box are 500mm long, 600mm wide and 750mm high.
An epoxy resin inflation foaming method comprises the following steps:
monitoring the air pressure in the epoxy resin foaming box body, introducing epoxy resin into the box body, and preparing to enter a foaming link;
and introducing gas into the box body, maintaining corresponding gas pressure and corresponding time, so that the epoxy resin composite material is foamed, and uniformly distributed gas holes are formed in the epoxy resin composite material to improve residual stress caused by nonuniform curing and improve the stability of the product.
Preferably, amine-based curing agents are used in amounts that are optimal for:
wherein the epoxy equivalent means the number of grams by mass of an epoxy resin containing 1g equivalent of epoxy group, and the epoxy value means the number of grams of epoxy group in 100g of the epoxy resin.
Preferably, under the condition of constant pressure, the pressure influence is negligible, and the reaction rate satisfies the following conditions:
wherein T is the thermodynamic temperature (K), E a For apparent reaction activation energy, A is a pre-exponential factor, R is a gas constant, f (alpha) is a curing reaction mechanism function of the epoxy resin, and alpha is a conversion rate.
Preferably, the cell morphology of the foamed epoxy resin sample is characterized by SEM, cell density N f Satisfies the following conditions:
formula of medium cell density N f The number of cells per cubic centimeter after foaming on the original unfoamed sample, n is the number of cells shown on the SEM photograph, A is the area (cm) of the SEM photograph 2 )，ρ 0 Is the density of the unfoamed epoxy resin (1.19 g/m) 3 )，ρ f Is the density of the sample after foaming.
Preferably, the density of the unfoamed epoxy resin and the density of the sample after foaming are both measured by the relationship between the mass and the density of the sample in air and water, and satisfy:
firstly, the mass m of a sample in the air is measured 0 Since the density of the foamed sample is usually lower than that of water, the mass of the sample is measured by sinking it in water with a metal basket having a mass m in water basket The mass of the metal basket and the foamed sample measured in water is m, rho water Is the density of water; if the density of the unfoamed sample is measured in this way, it is not necessary to resort to a metal basket, m, since its density is greater than that of water basket And m is 0, and the mass of the sample measured in water.
The invention has the following beneficial effects:
the epoxy resin inflation foaming device and the foaming method thereof enable uniformly distributed air holes to be formed in the epoxy resin composite material, are used for improving the residual stress generated by nonuniform curing, and simultaneously improve the stability and the reliability of the product on the premise of keeping various performances of the obtained composite material.
Drawings
Fig. 1 is a schematic structural diagram of an epoxy resin inflation foaming device provided in an embodiment of the present invention.
Reference numerals:
1. a box body; 2. a barometer; 3. a mixing box; 4. a feed valve; 5. an air supply valve; 6. an air compressor; 7. an external gas source.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, a preferred embodiment of the present invention provides an epoxy resin inflation foaming device, which includes a box 1, a feed pump body, an air compressor 6 and an air pressure gauge 2, wherein the side wall of the box 1 is respectively provided with a feed valve 4 and an air supply valve 5; the feeding pump body is respectively connected with an external material source and a feeding valve 4; the air compressor 6 is respectively connected with an external air source 7 and an air supply valve 5; the barometer 2 is arranged in the box body 1 and used for monitoring the air pressure in the box body 1.
Preferably, a mixing box 3 is arranged between the feed valve 4 and the feed pump body.
Preferably, the compressor has power of 3000W, exhaust gas volume of 240L/min, volume of 100L, voltage of 220V, net weight of 77kg, maximum pressure of 0.7MPa, external dimensions of 1190mm in length, 430mm in width and 700mm in height.
Preferably, the working environment temperature of the barometer 2 is-40-70 ℃.
Preferably, the internal dimensions of the box 1 are 500mm long, 600mm wide and 750mm high.
Furthermore, the QFR-01 ball valve that the air supply valve 5 is preferred sets up in the lateral wall of box 1, and its simple structure, small, light in weight, closely reliable, the sealed surface material of present ball valve extensively uses plastics, the leakproofness is good, convenient operation, opens and close rapidly, maintains advantages such as convenient and have long-lived. The quick on-off valve is mainly used in various industrial oil products, gas or steam pipelines to realize quick on-off functions.
Further, the barometer 2 is arranged at the top of the box body 1, and the connection is realized through M20 threads. The air pressure meter 2 adopts an optimal Y-100 pressure meter, the working environment temperature of the pressure meter is-40-70 ℃, the actual working condition can be well met, the self-accuracy grade is 1.6, and the reading is accurate.
Furthermore, the box body 1 is made of the optimized die steel, has certain toughness, wear resistance, high hardness, meshing resistance and thermal fatigue resistance, and can well adapt to the environmental working condition.
Further, the feed valve 4 is arranged in the center of the box body 1, the feed of the epoxy resin is controlled through the adopted feed valve 4, and other gases are prevented from being invaded in the box body 1 except the feed link. The adopted valve is a preferable T-S490 valve, and the valve can well ensure the tightness.
The preferred embodiment of the invention also provides an epoxy resin inflation foaming method, which comprises the following steps:
monitoring the air pressure in the epoxy resin foaming box body, introducing epoxy resin into the box body, and preparing to enter a foaming link;
and introducing gas into the box body, maintaining corresponding gas pressure and corresponding time, so that the epoxy resin composite material is foamed, and uniformly distributed gas holes are formed in the epoxy resin composite material to improve residual stress caused by nonuniform curing and improve the stability of the product.
When the discharge pressure of the air compressor reaches the rated pressure, the air compressor is controlled to stop. When the pressure is reduced to a certain pressure, the air compressor is controlled to start, mainly to keep the air pressure of the box body at a constant value.
For describing the foaming performance of the epoxy resin, parameters such as curing degree and gel time are generally used for description. Wherein the degree of cure is such that after compounding, the mixture begins to enter the cured phase, i.e. a hard rubbery soft gel, the resin mixture is still liquid and workable and suitable for application, and the mixture is only partially cured and the newly used epoxy resin is still chemically linked to it, so that the untreated surface can still be bonded or reacted.
For the same epoxy resin system, the degree of pre-curing is controlled by the ratio of reactants (i.e., the amount of curing agent), the reaction temperature, and the reaction time. The amount of curing agent used is generally calculated by the radical ratio of the reactants.
Preferably, amine-based curing agents are used in amounts that are optimal for:
wherein the epoxy equivalent means the number of grams by mass of an epoxy resin containing 1g equivalent of epoxy group, and the epoxy value means the number of grams of epoxy group in 100g of the epoxy resin.
Preferably, under the condition of constant pressure, the pressure influence is negligible, and the reaction rate satisfies the following conditions:
wherein T is the thermodynamic temperature (K), E a The apparent reaction activation energy is A, a pre-index factor, R, a gas constant, f (alpha) is a curing reaction mechanism function of the epoxy resin, and alpha is a conversion rate.
Preferably, the cell morphology of the foamed epoxy resin sample is characterized by SEM, cell density N f Satisfies the following conditions:
formula of medium cell density N f Is not foamed originallyThe number of cells per cubic centimeter after foaming on the sample, n is the number of cells shown on the SEM photograph, A is the area (cm) of the SEM photograph 2 )，ρ 0 The density of the unfoamed epoxy resin (1.19 g/m) 3 )，ρ f Is the density of the sample after foaming.
Preferably, the density of the unfoamed epoxy resin and the density of the sample after foaming are both measured by the relationship between the mass and the density of the sample in air and water, and satisfy:
firstly, the mass m of a sample in the air is measured 0 Since the density of the foamed sample is generally less than that of water, the mass of the sample is measured by sinking it in water by means of a metal basket having a mass m in water basket The mass of the metal basket and the foamed sample measured in water is m, rho water Is the density of water; if the density of the unfoamed sample is measured in this way, it is not necessary to resort to a metal basket, m, since its density is greater than that of water basket And m is 0, and the mass of the sample measured in water.
In summary, the preferred embodiment of the present invention provides an epoxy resin inflation foaming device and a foaming method thereof, which are compared with the prior art:
the epoxy resin inflation foaming device and the foaming method thereof enable uniformly distributed air holes to be formed in the epoxy resin composite material, are used for improving the residual stress generated by nonuniform curing, and simultaneously improve the stability and the reliability of the product on the premise of keeping various performances of the obtained composite material.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. An epoxy aerifys foaming device which characterized in that includes:
the side wall of the box body (1) is respectively provided with a feeding valve (4) and an air supply valve (5);
the feeding pump body is respectively connected with an external material source and a feeding valve (4);
the air compressor (6), the said air compressor (6) connects external air supply (7) and air supply valve (5) separately;
the air pressure meter (2) is arranged in the box body (1) and used for monitoring the air pressure in the box body (1).
2. The epoxy resin aerating and foaming device of claim 1, wherein: a mixing box (3) is arranged between the feeding valve (4) and the feeding pump body.
3. The epoxy resin aerating and foaming device of claim 1, wherein: the power of the air compressor (6) is 3000W, the air displacement is 240L/min, the volume is 100L, the voltage is 220V, the net weight is 77kg, the highest pressure can reach 0.7Mpa, and the external dimension of the air compressor is 1190mm in length, 430mm in width and 700mm in height.
4. The epoxy resin aerating and foaming device of claim 1, wherein: the working environment temperature of the barometer (2) is-40-70 ℃.
5. The epoxy resin aerating and foaming device of claim 1, wherein: the internal dimension of box (1) is for length 500mm, wide 600mm, height 750 mm.
6. An epoxy resin inflation foaming method is characterized in that: the method comprises the following steps:
monitoring the air pressure in the epoxy resin foaming box body, introducing epoxy resin into the box body, and preparing to enter a foaming link;
and introducing gas into the box body, maintaining corresponding gas pressure and corresponding time, so that the epoxy resin composite material is foamed, and uniformly distributed gas holes are formed in the epoxy resin composite material to improve residual stress caused by nonuniform curing and improve the stability of the product.
7. The epoxy resin inflation foaming method according to claim 6, characterized in that: the optimal dosage of the amine curing agent satisfies the following conditions:
wherein the epoxy equivalent means the number of grams by mass of an epoxy resin containing 1g equivalent of epoxy group, and the epoxy value means the number of grams of epoxy group in 100g of the epoxy resin.
8. The epoxy resin inflation foaming method according to claim 6, characterized in that: under the condition of constant pressure, the pressure influence is negligible, and the reaction rate satisfies the following conditions:
wherein T is the thermodynamic temperature (K), E a The apparent reaction activation energy is A, a pre-index factor, R, a gas constant, f (alpha) is a curing reaction mechanism function of the epoxy resin, and alpha is a conversion rate.
9. The epoxy resin inflation foaming method according to claim 6, characterized in that: the foam morphology of the foamed epoxy resin sample is characterized by SEM and the cell density is N f Satisfies the following conditions:
formula of medium cell density N f Is the number of cells per cubic centimeter after foaming on the original unfoamed sample, n is the number of cells shown on the SEM photograph, A is the area of the SEM photograph, ρ 0 Density of unfoamed epoxy resin, p f Is the density of the sample after foaming.
10. The epoxy resin inflation foaming method according to claim 9, characterized in that: the density of the unfoamed epoxy resin and the foamed sample is measured by the relation between the mass and the density of the sample in air and water, and satisfies the following conditions:
firstly, the mass m of a sample in the air is measured 0 Since the density of the foamed sample is generally less than that of water, the mass of the sample is measured by sinking it in water by means of a metal basket having a mass m in water basket The mass of the metal basket and the foamed sample measured in water is m, rho water Is the density of water; if the density of the unfoamed sample is measured in this way, it is not necessary to resort to a metal basket, m, since its density is greater than that of water basket And m is 0, and the mass of the sample measured in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210737693.7A CN115122562A (en) | 2022-06-24 | 2022-06-24 | Epoxy resin inflation foaming device and foaming method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210737693.7A CN115122562A (en) | 2022-06-24 | 2022-06-24 | Epoxy resin inflation foaming device and foaming method thereof |
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| CN115122562A true CN115122562A (en) | 2022-09-30 |
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| CN202210737693.7A Pending CN115122562A (en) | 2022-06-24 | 2022-06-24 | Epoxy resin inflation foaming device and foaming method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105601977A (en) * | 2016-01-13 | 2016-05-25 | 华东理工大学 | Modified polyamide-6 microcellular foam material and preparation method thereof |
| CN110028763A (en) * | 2019-04-12 | 2019-07-19 | 西北工业大学 | The preparation method of low-density high magnification epoxy resin poromerics |
| CN210477572U (en) * | 2019-06-19 | 2020-05-08 | 江苏集萃先进高分子材料研究所有限公司 | Particle fusion supercritical mould pressing foaming production device |
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2022
- 2022-06-24 CN CN202210737693.7A patent/CN115122562A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105601977A (en) * | 2016-01-13 | 2016-05-25 | 华东理工大学 | Modified polyamide-6 microcellular foam material and preparation method thereof |
| CN110028763A (en) * | 2019-04-12 | 2019-07-19 | 西北工业大学 | The preparation method of low-density high magnification epoxy resin poromerics |
| CN210477572U (en) * | 2019-06-19 | 2020-05-08 | 江苏集萃先进高分子材料研究所有限公司 | Particle fusion supercritical mould pressing foaming production device |
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