CN105291326A - Epoxy resin photoelastic model and manufacturing method thereof - Google Patents
Epoxy resin photoelastic model and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses an epoxy resin photoelastic model and a manufacturing method thereof. The method comprises the steps that number 618 epoxy resin, methylhexahydrophthalic anhydride, accelerant DMP-30 and an epoxy resin deforming agent are used for preparing mixed liquor; when the mixed liquor is prepared, the weighed methylhexahydrophthalic anhydride and epoxy resin deforming agent are poured into the epoxy resin to start stirring, and the weighed DMP-30 is dropped into the mixed liquor drip by drip by a rubber head dropper; the mixed liquor is poured into a mold; after pouring is completed, the mold is put into an oven to be heated, and the mixed liquor is solidified; after the heating process is ended, the mold is taken out from the oven, and a formed model can be obtained after the mold is dismantled; and the epoxy resin photoelastic model can be obtained after the molded model is put into the oven to be annealed. The reaction process of the mixed liquor prepared by the formula is not strong; the solidification time is short; the solidification process is simple; the annealing effect is good after the model is molded; internal residual stress is small; adopted chemical raw materials are low in toxicity and free of pungent smell, and nearly have no harm to human bodies.
Description
Technical field
The present invention relates to Experimental Mechanics research field, be specially a kind of epoxy resin photoelastic model and preparation method thereof.。
Background technology
Photoelastic method is a branch in Experimental Mechanics, this method is exactly make the model similar to material object with optics sensitive material, or in actual components, paste optics sensitive material, under corresponding load action, with polarizing light irradiation and by calculating the variation of stress that just can obtain surface and inside.The components of stress of trying to achieve in this way have enough precision concerning engineering design, and its intuitive is strong, and reliability is high, wide adaptability, can obtain the whole stress states at various complex condition.Particularly to theory calculate comparatively difficulty complex-shaped, load is complicated and have the component that stress is concentrated, photoelastic method more can demonstrate its superiority.Due to experiment by photoelastic method be solve complicated two-dimensional, three-dimensional engineering structure stress analysis the effective experimental technique of one, for a long time it always by academia and engineering circles pay attention to.Photoelastic phenomenon was just found as far back as 1816, but until be just widely used in the thirties in 20th century solving Practical Project problem, its main cause is exactly lack suitable cast material.A lot of researcher once used the materials such as phenolic resins, propyl benzene resin, Merlon, allyl resin and mylar as photoelastic model material, but effect is all not ideal enough.Until nineteen fifty-one, there is the novel elastooptic mateiral taking epoxy resin as base, this material is isotropic material, its transparency and optical sensitivity higher, initial stress and fringe time effect little, the creep of mechanics optics is little, is easy to machining and machining stress is little, therefore becomes the ideal material making photoelastic model.
More existing scholars sum up the formula of several making epoxy resin pattern at present, but these formulas have the shortcomings such as complex manufacturing technology, complex steps, fabrication cycle length, and some raw material used of filling a prescription is also toxic, very large to body harm.These problems all considerably increase the complexity and difficulties of experiment by photoelastic method, have impact on the carrying out of experiment by photoelastic method.In order to overcome above-mentioned shortcoming, simplifying and improving the preparation method of photoelastic model, just becoming main purpose of the present invention.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, reduce the complexity of epoxy resin photoelastic model manufacturing process, provide that a kind of operation is easier, fabrication cycle is shorter, to little epoxy resin photoelastic model of body harm and preparation method thereof.
Concrete technical scheme is as follows:
A preparation method for epoxy resin photoelastic model, adopts 618# epoxy resin, methyl hexahydrophthalic anhydride, altax P-30, epoxy resin defoamer four kinds of raw material preparation mixed liquors; First load weighted methyl hexahydrophthalic anhydride, epoxy resin defoamer are poured in epoxy resin and started to stir during preparation mixed liquor, in whipping process, with glue head dropper, load weighted DMP-30 is dropwise instilled mixed liquor; Mixed liquor is poured into the mold in tool; After building, mould is put into oven heat, mixed liquor is solidified; After heating process terminates, mould is taken out from baking box, pull down mould and can obtain shaping model; Shaping model is put into baking box to carry out taking off fire and namely obtain epoxy resin photoelastic model.
Described preparation method, the part by weight of 618# epoxy resin, methyl hexahydrophthalic anhydride, altax P-30, epoxy resin defoamer four kinds of raw materials is 250:205:3:1.Altax P-30 solidify reaction process is very violent, if DMP-30 consumption is too much, can produce a large amount of sediment in the mixed liquor of preparation; If consumption is very few, the time that mixed liquor solidification needs can be very long, substantially prolongs the fabrication cycle of model, thus affect the experiment progress in later stage.
Described preparation method, the temperature of solidification process arranges as follows: 80 DEG C of constant temperature 2 hours, 85 DEG C of constant temperature 0.5 hour, 90 DEG C of constant temperature 0.5 hour, 95 DEG C of constant temperature 0.5 hour, 100 DEG C of constant temperature 2 hours, 95 DEG C of constant temperature 1 hour, 90 DEG C of constant temperature 1 hour, 85 DEG C of constant temperature 1 hour, 80 DEG C of constant temperature 1 hour, 70 DEG C of constant temperature 1 hour.
Described preparation method, the temperature taking off fiery process arranges as follows: 70 DEG C of constant temperature 1 hour, 90 DEG C of constant temperature 1 hour, 110 DEG C of constant temperature 1 hour, 130 DEG C of constant temperature 1 hour, and 150 DEG C of constant temperature 10 hours, then cooling per hour 2 DEG C, until temperature drops to 30 DEG C.
Described preparation method, takes off before fiery process starts, gets one piece of glass plate slightly larger than epoxy resin photoelastic model bottom surface, successively with clear water with dip in spirituous medical absorbent cotton glass cleaning wiped clean, then with dust-free cleaning cloth, glass plate is dried; With brush at glass pane surface even brush one deck silicone oil, epoxy resin photoelastic model bottom surface is put on a glass, between model and glass plate, one deck oil film can be formed.
Described preparation method, described mould adopts clamping one deck lucite parting bead composition in the middle of two pieces of glass plates, glass plate and lucite parting bead is sticked together with 704 fluid sealants; The elastic inner core of the midsole layer 3-5 millimeters thick of lucite parting bead.
Described preparation method, described lucite parting bead is " U " type organic glass frame.
Two blocks of glass plate clear water are cleaned by described preparation method, then with dipping in the medical absorbent cotton cleaning glass window plate of alcohol, glass pane surface being wiped bright smooth as minute surface, with dust-free cleaning cloth, glass plate is dried subsequently; Then JD-909A releasing agent is sprayed on a face of glass plate equably, with dust-free cleaning cloth in glass pane surface slowly wiping in the same direction, releasing agent is smeared evenly, glass pane surface is made to seem the same with before coating release agent smooth, then glass plate is put into baking box constant temperature 20 minutes, temperature is set to 80 DEG C, and releasing agent is dried; Then clip lucite parting bead with two pieces of glass plates, inwardly, the one side not having releasing agent outwardly, clamps glass plate 13 with grip block 14 one side having releasing agent; Outside lucite parting bead 11, namely the left side of mould, right side, downside, coat 704 fluid sealants, two pieces of glass plates and lucite parting bead sticked together, define the die space of certain volume between two pieces of glass plates and lucite parting bead; 704 fluid sealants after solidifying completely remove grip block, and Mold Making completes.
Above-mentioned arbitrary described preparation method is adopted to make the epoxy resin photoelastic model obtained.The inventive method mixed liquor course of reaction is inviolent, and hardening time is shorter, and solidification process is simple, and take off fire after model forming respond well, internal residual stress is less, and chemical raw material toxicity used is little, has no irritating odor, is almost safe from harm to health.
Accompanying drawing explanation
Fig. 1 is U-shaped lucite parting bead schematic diagram;
Fig. 2 is the U-shaped lucite parting bead schematic diagram adding elastic inner core;
Fig. 3 is the mould schematic diagram after fixing with grip block;
Fig. 4 is the left side view of mould shown in Fig. 3;
Fig. 5 is the schematic diagram of building epoxy resin pattern process
Fig. 6 is the temperature and time graph of a relation of mixed liquor solidification process
Fig. 7 is the temperature and time graph of a relation that model takes off fiery process
In figure, 11U shape lucite parting bead, 12 elastic inner core, 13 glass plates, 14 grip blocks, 15704 fluid sealants, 16 funnels, 17 plastic pipes, 18 hospital gauzes.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment
A kind of new formula and preparation method making epoxy resin photoelastic model of the present invention, its preferably detailed description of the invention be:
With reference to Fig. 1-Fig. 4.Experimental needs, choose the suitable lucite parting bead of size 11 and two pieces of glass plates 13, in the present embodiment, lucite parting bead 11 is " U " type organic glass frame of thickness 8mm, and the size of two pieces of glass plates 13 is the same, and its length x width x thickness is 410mm × 305mm × 6mm.First use small brushes the even scrubbing brush of 704 fluid sealant inside lucite parting bead 11 " U " type, the thickness of brush is about 3-5 millimeter, waits 704 fluid sealant natural coagulations, forms the elastic inner core 12 of 3-5 millimeters thick.Two pieces of glass plates 13 are cleaned with clear water simultaneously, then with dipping in the medical absorbent cotton cleaning glass window plate 13 of alcohol, glass plate 13 surface being wiped bright smooth as minute surface, with dust-free cleaning cloth, glass plate 13 is dried subsequently.Then JD-909A releasing agent is sprayed on a face of glass plate 13 equably, with dust-free cleaning cloth slowly wiping in the same direction on glass plate 13 surface, releasing agent is smeared evenly, glass plate 13 surface is made to seem the same with before coating release agent smooth, then glass plate 13 is put into baking box constant temperature 20 minutes, temperature is set to 80 DEG C, and releasing agent is dried.Then clip lucite parting bead 11 with two pieces of glass plates 13, inwardly, the one side not having releasing agent outwardly, clamps glass plate 13 with grip block 14 one side having releasing agent.Outside lucite parting bead 11, (i.e. the left side of mould, right side, downside) coats 704 fluid sealants, two pieces of glass plates 13 and lucite parting bead 11 are sticked together, between two pieces of glass plates 13 and lucite parting bead 11, defines the die space of certain volume.After 704 fluid sealants solidify completely, grip block 14 is removed.
With reference to figure 5-Fig. 6.First according to 618# weight epoxy: methyl hexahydrophthalic anhydride weight: altax P-30 weight: the ratio of epoxy resin defoamer weight=250:205:3:1, the weight needed for four kinds of raw materials is determined.Altax P-30 solidify reaction process is very violent, if DMP-30 consumption is too much, can produce a large amount of sediment in the mixed liquor of preparation; If consumption is very few, the time that mixed liquor solidification needs can be very long, substantially prolongs the fabrication cycle of model, thus affect the experiment progress in later stage.If curing agent methyl hexahydrophthalic anhydride consumption is very few, the curing proceeding of mixed liquor can be affected; If consumption is too much, the optical property of model can be affected.Experiment by photoelastic method be the birefringent phenomenon of the light utilizing epoxy resin to have to reflect stress distribution situation in model, then the corresponding field of force is carried out analyzing thus is drawn experiment conclusion.If other material proportions are excessive in mixed liquor, epoxy resin ratio is less, will inevitably affect the birefringence effect of model.In like manner, in mixed liquor, the ratio of defoamer also only need reach the effect can avoiding producing a large amount of bubble, does not need consumption too much.With the good required epoxy resin of electronic balance weighing, to put it in baking box constant temperature 2 hours, temperature is 80 DEG C, and the bubble in epoxy resin is overflowed completely.With the methyl hexahydrophthalic anhydride needed for electronic balance weighing, DMP-30, epoxy resin defoamer, methyl hexahydrophthalic anhydride and epoxy resin defoamer are poured in epoxy resin, the mixed liquor of three kinds of raw materials is put into constant temperature water bath agitator stir, mixing time is 30 minutes, bath temperature is 80 DEG C, and mixing speed is moderate.In whipping process, with glue head dropper, load weighted altax P-30 is drop by drop instilled mixed liquor lentamente.After stirring terminates, pad one deck hospital gauze 18 in funnel 16, at funnel 16 times terminations plastic pipe 17, plastic pipe 17 other end is inserted into mold bottom, and the mixed liquor be stirred slowly is poured into funnel 16.Mixed liquor flows in mould through funnel 16 and plastic pipe 17.After building, mould is put into oven heat, mixed liquor is solidified, the temperature of solidification process arranges as follows: 80 DEG C of constant temperature 2 hours, 85 DEG C of constant temperature 0.5 hour, 90 DEG C of constant temperature 0.5 hour, 95 DEG C of constant temperature 0.5 hour, 100 DEG C of constant temperature 2 hours, 95 DEG C of constant temperature 1 hour, 90 DEG C of constant temperature 1 hour, 85 DEG C of constant temperature 1 hour, 80 DEG C of constant temperature 1 hour, 70 DEG C of constant temperature 1 hour.
80 DEG C time, mixed liquor just reaches curing reaction temperature, starts to solidify gradually, and just course of reaction is slowly at this temperature.100 DEG C is the optimal reaction temperature of mixed liquor, and solidification process is very fast.If but during solidification, temperature were directly set to 100 DEG C, mixeding liquid temperature would be elevated to rapidly 100 DEG C from 80 DEG C when stirring, and variations in temperature suddenly can make model inside leave larger residual stress, thus affects experiment effect.Therefore the temperature of solidification process is set to be elevated to 100 degrees Celsius according to certain gradient from 80 DEG C, and its temperature is raised gradually.In like manner, after model solidifies completely under 100 DEG C of conditions, again temperature is reduced gradually from 100 DEG C, because now model has cured shaping, solid very easily produces subtle flow under the condition of temperature abrupt change, therefore the variable gradient of temperature is set to, than slower during intensification, avoid in temperature-fall period, producing internal stress in model or producing subtle flow.After heating process terminates, mould is taken out from baking box, pull down mould and can obtain shaping model.
With reference to figure 7.Get one piece of glass plate slightly larger than epoxy resin Slab, successively with clear water and dip in spirituous medical absorbent cotton glass cleaning wiped clean, then with dust-free cleaning cloth, glass plate is dried.With brush at glass pane surface even brush one deck silicone oil, epoxy resin Slab is placed on glass plate, the oil film of thin layer now between model and glass plate, can be formed, then put it in baking box and carry out taking off fire.The temperature taking off fiery process arranges as follows: 70 DEG C of constant temperature 1 hour, 90 DEG C of constant temperature 1 hour, 110 DEG C of constant temperature 1 hour, 130 DEG C of constant temperature 1 hour, and 150 DEG C of constant temperature 10 hours, then cooling per hour 2 DEG C, until temperature drops to 30 DEG C.If temperature directly reaches 150 DEG C, model raises suddenly due to temperature, may produce slight deformation, therefore needs temperature to be elevated to 150 DEG C by certain gradient.Model is under all free condition in each surface, and 150 DEG C time, deliquescing is indeformable gradually.Model, at such a temperature through the sufficiently long time, can make model discharge remaining in inner stress during solidification gradually.Then allow model gradually cool with speed very slowly, make that model is inner in cooling procedure no longer produces the internal stress exceeding allowed band.
Material such as organic glass strip, glass plate that in above-described embodiment, analogue formation adopts can be replaced by other materials, and the model structure of the writing board shape made in the present embodiment adopts the common materials such as lucite parting bead, glass plate.If the model structure made is complicated, as the model etc. of three-dimensional, can experimentally need to use the materials such as silicon rubber, paraffin, gypsum to make the mould of various shape.
Although the specific embodiment of the present invention is described by reference to the accompanying drawings by foregoing, but will be appreciated that above-mentioned description should not be considered to limitation of the present invention, after those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited by the claims of enclosing, and any change on the claims in the present invention basis all belongs to protection scope of the present invention.
Claims (10)
1. a preparation method for epoxy resin photoelastic model, is characterized in that, adopts 618# epoxy resin, methyl hexahydrophthalic anhydride, altax P-30, epoxy resin defoamer four kinds of raw material preparation mixed liquors; First load weighted methyl hexahydrophthalic anhydride, epoxy resin defoamer are poured in epoxy resin and started to stir during preparation mixed liquor, in whipping process, with glue head dropper, load weighted DMP-30 is dropwise instilled mixed liquor; Mixed liquor is poured into the mold in tool; After building, mould is put into oven heat, mixed liquor is solidified; After heating process terminates, mould is taken out from baking box, pull down mould and can obtain shaping model; Shaping model is put into baking box to carry out taking off fire and namely obtain epoxy resin photoelastic model.
2. preparation method according to claim 1, is characterized in that, the part by weight of 618# epoxy resin, methyl hexahydrophthalic anhydride, altax P-30, epoxy resin defoamer four kinds of raw materials is 250:205:3:1.
3. preparation method according to claim 2, it is characterized in that, the temperature of solidification process arranges as follows: 80 DEG C of constant temperature 2 hours, 85 DEG C of constant temperature 0.5 hour, 90 DEG C of constant temperature 0.5 hour, 95 DEG C of constant temperature 0.5 hour, 100 DEG C of constant temperature 2 hours, 95 DEG C of constant temperature 1 hour, 90 DEG C of constant temperature 1 hour, 85 DEG C of constant temperature 1 hour, 80 DEG C of constant temperature 1 hour, 70 DEG C of constant temperature 1 hour.
4. preparation method according to claim 3, is characterized in that, the temperature taking off fiery process arranges as follows: 70 DEG C of constant temperature 1 hour, 90 DEG C of constant temperature 1 hour, 110 DEG C of constant temperature 1 hour, 130 DEG C of constant temperature 1 hour, 150 DEG C of constant temperature 10 hours, then cooling per hour 2 DEG C, until temperature drops to 30 DEG C.
5. preparation method according to claim 4, it is characterized in that, take off before fiery process starts, get one piece of glass plate slightly larger than epoxy resin photoelastic model bottom surface, successively with clear water and dip in spirituous medical absorbent cotton glass cleaning wiped clean, then with dust-free cleaning cloth, glass plate is dried; With brush at glass pane surface even brush one deck silicone oil, epoxy resin photoelastic model bottom surface is put on a glass, between model and glass plate, one deck oil film can be formed.
6. preparation method according to claim 5, is characterized in that, described mould adopts clamping one deck lucite parting bead composition in the middle of two pieces of glass plates, glass plate and lucite parting bead is sticked together with 704 fluid sealants; The elastic inner core of the midsole layer 3-5 millimeters thick of lucite parting bead.
7. preparation method according to claim 6, is characterized in that, described lucite parting bead is " U " type organic glass frame.
8. preparation method according to claim 6, it is characterized in that, two blocks of glass plate clear water are cleaned, then with dipping in the medical absorbent cotton cleaning glass window plate of alcohol, glass pane surface is wiped bright smooth as minute surface, with dust-free cleaning cloth, glass plate is dried subsequently; Then JD-909A releasing agent is sprayed on a face of glass plate equably, with dust-free cleaning cloth in glass pane surface slowly wiping in the same direction, releasing agent is smeared evenly, glass pane surface is made to seem the same with before coating release agent smooth, then glass plate is put into baking box constant temperature 20 minutes, temperature is set to 80 DEG C, and releasing agent is dried; Then clip lucite parting bead with two pieces of glass plates, inwardly, the one side not having releasing agent outwardly, clamps glass plate 13 with grip block 14 one side having releasing agent; Outside lucite parting bead 11, namely the left side of mould, right side, downside, coat 704 fluid sealants, two pieces of glass plates and lucite parting bead sticked together, define the die space of certain volume between two pieces of glass plates and lucite parting bead; 704 fluid sealants after solidifying completely remove grip block, and Mold Making completes.
9., according to the arbitrary described preparation method of claim 1-8, it is characterized in that, mixed liquor is slowly built in progressive die tool through funnel and plastic pipe after stirring; The upper end of plastic pipe is connected with funnel lower end, and lower end reaches mould bottommost, can avoid like this producing bubble in casting process.
10. make according to the arbitrary described preparation method of claim 1-8 the epoxy resin photoelastic model obtained.
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Cited By (4)
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| CN106928657A (en) * | 2017-03-17 | 2017-07-07 | 河南理工大学 | A kind of production method of the epoxy resin board for photoelastic experiment test |
| CN108036882A (en) * | 2018-02-12 | 2018-05-15 | 中国矿业大学(北京) | A kind of photoelastic experiment device for top coal caving stress trajectory |
| CN110320116A (en) * | 2018-03-29 | 2019-10-11 | 中国矿业大学(北京) | It is a kind of it is photoelastic with caustics method synchronize the blasting experiment system that uses |
| CN112757676A (en) * | 2019-04-12 | 2021-05-07 | 云南农业大学 | Method for manufacturing epoxy resin honeycomb model by demolding with demolding agent |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106928657A (en) * | 2017-03-17 | 2017-07-07 | 河南理工大学 | A kind of production method of the epoxy resin board for photoelastic experiment test |
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| CN108036882B (en) * | 2018-02-12 | 2022-07-08 | 中国矿业大学(北京) | Photoelastic experimental device for observing stress of top coal caving mining |
| CN110320116A (en) * | 2018-03-29 | 2019-10-11 | 中国矿业大学(北京) | It is a kind of it is photoelastic with caustics method synchronize the blasting experiment system that uses |
| CN112757676A (en) * | 2019-04-12 | 2021-05-07 | 云南农业大学 | Method for manufacturing epoxy resin honeycomb model by demolding with demolding agent |
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