Polyurethane physical property sample mold and preparation method

Abstract

The invention discloses a polyurethane physical property sample mold and a preparation method, and relates to the technical field of polyurethane physical property sample preparation, the polyurethane physical property sample mold comprises a bottom plate, a guide plate, a cavity plate and a check block, the guide plate is detachably arranged on the bottom plate, a cavity groove is formed between the guide plate and the bottom plate, and the check block is arranged in the cavity groove; the mold cavity plate is arranged in the mold cavity groove in a drawable mode and can slide on the bottom plate, the check block is arranged at one end of the mold cavity plate, and a plurality of mold holes in different shapes are formed in the bottom wall of the mold cavity plate. According to the invention, through the arrangement of the bottom plate, the guide plate, the cavity plate and the stop block, a plurality of different types of physical property samples can be simultaneously manufactured at one time, all the samples are formed at one time, machining is not needed, the sizes and shapes of the samples are accurate, and the surfaces of the samples are smooth, so that accurate physical property data of the polyurethane material can be obtained during testing.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane physical property sample preparation, and in particular to a polyurethane physical property sample mold and a preparation method thereof. Background Art

[0002] Casting polyurethane materials are widely used in the production of polyurethane solid rollers and other products due to their excellent physical properties. In the development of different casting polyurethane material formulas and in the production process of polyurethane products, it is necessary to make physical property samples to test the physical properties of polyurethane materials.

[0003] Among the devices or methods for making polyurethane physical property samples that have been disclosed so far, thin sheet test samples (such as samples for testing tensile strength and tear strength) are usually made of polyurethane materials into sheets and then cut with a cutter; cylindrical or block test samples (such as samples for testing abrasion, hardness, compression set, etc.) are usually made by mold forming and assisted by mechanical processing. When the test sample is made by cutting the sheet with a cutter, the side of the sample in the thickness direction is not perpendicular to the surface of the sheet. The blunt cutting edge of the cutting tool or the tooling and other factors will also cause the shape of the cut test piece to be irregular, resulting in inaccurate test results; the block or columnar samples formed by the mold are difficult to clamp during mechanical processing. Due to the high elasticity of the polyurethane material, the dimensional accuracy of the processed sample is not high, and it is difficult to obtain a high surface finish.

[0004] In addition, the prior art CN217257753U also discloses a polyurethane compression sample casting device, but the prior art still has the following technical defects: 1. When the product is demolded, multiple pieces are overlapped and pressed out with a tool. Since the strength of the polyurethane is very low during demolding, the upper several products have to pass through multiple mold cavities before they can be ejected, and the sample is easily damaged; 2. This device is not suitable for making thin sheet samples, because the processing technology for making thin sheet comb teeth is poor, and the comb teeth are easily deformed, damaged and broken. Summary of the invention

[0005] The purpose of the present invention is to provide a polyurethane physical property sample mold and a preparation method thereof, so as to solve the above-mentioned technical problems.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A polyurethane physical property sample mold comprises a base plate, a guide plate, a cavity plate and a stopper, wherein the guide plate is detachably arranged on the base plate, a cavity groove is formed between the guide plate and the base plate, the cavity plate is pullable and arranged in the cavity groove and can slide on the base plate, the stopper is arranged at one end of the cavity plate, and a plurality of mold holes of different shapes are opened on the bottom wall of the cavity plate.

[0008] Preferably, a handle is further included, and the handle is provided at one end of the stopper away from the cavity plate.

[0009] Preferably, both sides of the upper end of the bottom plate extend upward to form raised portions.

[0010] As a further preference, a notch is provided on the protruding portion, and the guide plate is detachably installed in the notch via a connecting piece.

[0011] Preferably, two sides of the upper end of the cavity plate extend upward to form two limiting portions.

[0012] As a further preference, one end of the limiting portion close to the stop block protrudes upward to form a stop step, and the stop block is detachably connected to the two stop steps.

[0013] Preferably, a guide plate is further included, wherein the guide plate is arranged on the inner bottom wall of the cavity plate, and a guide groove is opened on the lower side wall of the guide plate, and the guide groove cooperates with the guide plate.

[0014] As a further preference, the lower side walls of the guide plate are located on both sides of the guide groove to form scrapers.

[0015] Preferably, a cavity is formed between the stopper, the cavity plate and the guide plate.

[0016] A method for preparing a polyurethane physical property sample, comprising the polyurethane physical property sample mold described in item 1, characterized in that the preparation method comprises:

[0017] S1. Place the polyurethane physical property sample mold in an oven and preheat it to a certain temperature, then take it out of the oven;

[0018] S2. Pour a proper amount of polyurethane raw material into each hole of the cavity plate, and the liquid level of the polyurethane raw material exceeds the upper port of each hole;

[0019] S3, push the cavity plate into the cavity groove between the bottom plate and the guide plate until the stop step of the cavity plate abuts against the end surface of the guide plate;

[0020] S4. Then, the polyurethane physical property sample mold is placed in an oven. After the polyurethane raw material is solidified, the polyurethane physical property sample mold is taken out from the oven, the cavity plate is pulled out, and the prepared sample and the block waste formed by the solidification of the excess polyurethane raw material are taken out from the cavity plate.

[0021] The above technical solution has the following advantages or beneficial effects:

[0022] In the present invention, through the arrangement of the bottom plate, the guide plate, the cavity plate and the stopper, a plurality of different types of physical property samples can be produced at one time, all the samples are formed at one time, and no further machining is required. The sample size and shape are accurate, and the surface is smooth, so accurate physical property data of the polyurethane material can be obtained during testing; and the mold is in the shape of a sheet as a whole, and the depth, size and shape of the internal mold hole can also be set as needed to adapt to different sheet products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a stereoscopic diagram of a polyurethane physical property sample mold in the present invention;

[0024] Figure 2 is a top view of a polyurethane physical property sample mold in the present invention;

[0025] Figure 3 yes Figure 2 Sectional view along AA direction;

[0026] Figure 4 It is a schematic diagram of the explosion of the polyurethane physical property sample mold in the present invention.

[0027] In the figure: 1, bottom plate; 2, guide plate; 3, cavity plate; 4, stopper; 5, cavity groove; 6, mold hole; 7, handle; 8, raised part; 9, notch; 10, limit part; 11, stop step; 12, guide plate; 13, guide groove; 14, scraper. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Figure 1 It is a stereoscopic diagram of a polyurethane physical property sample mold in the present invention; Figure 2 is a top view of a polyurethane physical property sample mold in the present invention; Figure 3 yes Figure 2 Sectional view along AA direction; Figure 4 Schematic diagram of the explosion of the polyurethane physical property sample mold in the present invention. Figures 1 to 4 As shown, a preferred embodiment is shown, which is a polyurethane physical property sample mold, including a bottom plate 1, a guide plate 2, a cavity plate 3 and a stopper 4. The bottom plate 1 is detachably provided with a guide plate 2, a cavity groove 5 is formed between the guide plate 2 and the bottom plate 1, the cavity plate 3 is retractably arranged in the cavity groove 5 and can slide on the bottom plate 1, a stopper 4 is arranged at one end of the cavity plate 3, and a plurality of mold holes 6 of different shapes are opened on the bottom wall of the cavity plate 3. In this embodiment, see Figure 4 As shown, a cavity groove 5 is formed between the bottom plate 1 and the guide plate 2, and the cavity plate 3 can be slidably arranged in the cavity groove 5. Different shapes of mold holes 6 are arranged on the bottom wall of the cavity plate 3. Multiple different types of physical property samples can be produced at one time, and all samples can be formed at one time without the need for further mechanical processing. The sample size and shape are accurate, and the surface is smooth. Accurate physical property data of the polyurethane material can be obtained during testing.

[0032] An appropriate amount of polyurethane raw material is injected into the mold hole 6, and then the mold cavity plate 3 is pushed into the mold cavity groove 5, and then placed in an oven for drying, so that the polyurethane raw material is solidified to form a sample.

[0033] Further, as a preferred embodiment, a handle 7 is further included, and a handle 7 is provided at one end of the stopper 4 away from the cavity plate 3. The handle 7 is integrally connected to the stopper 4, and the setting of the handle 7 facilitates the pulling of the cavity plate 3, so that the cavity plate 3 can smoothly enter or leave the cavity groove 5.

[0034] Further, as a preferred embodiment, both sides of the upper end of the bottom plate 1 extend upward to form protrusions 8. The two protrusions 8 can play a role of limiting, facilitating the cavity plate 3 to slide along a predetermined track, and also ensuring the stable sliding of the cavity plate 3.

[0035] Further, as a preferred embodiment, a notch 9 is provided on the protrusion 8, and the guide plate 2 is detachably installed in the notch 9 through a connecting piece. The notch 9 cooperates with the guide plate 2 so that both sides of the guide plate 2 are clamped in the notch 9, and then connected and fixed by the connecting piece, which can be a bolt or a screw. The notch 9 is provided to facilitate positioning of the guide plate 2 and facilitate rapid installation of the guide plate 2.

[0036] Further, as a preferred embodiment, the upper ends of the cavity plate 3 extend upward to form two limit portions 10. The setting of the limit portions 10 can facilitate the scraping of the excess polyurethane material in the mold hole 6 into the cavity formed between the stopper 4, the cavity plate 3 and the guide plate 2, and can prevent the excess polyurethane material from overflowing.

[0037] Further, as a preferred embodiment, one end of the limiting portion 10 close to the stopper 4 is upwardly protruded to form a stop step 11, and the stopper 4 is detachably connected to the two stop steps 11. When the cavity plate 3 is slid, the cavity plate 3 enters the cavity groove 5, and the stop step 11 can abut against the guide plate 2 to play a limiting role. When the stop step 11 abuts against the guide plate 2, it means that the cavity plate 3 has entered into place.

[0038] Further, as a preferred embodiment, it also includes a guide plate 12, the inner bottom wall of the cavity plate 3 is provided with a guide plate 12, the lower side wall of the guide plate 2 is provided with a guide groove 13, and the guide groove 13 is matched with the guide plate 12. Figure 4 As shown, the guide plate 12 is used to guide the cavity plate 3 during its sliding process, so that the cavity plate 3 can slide more stably and smoothly, and can avoid shaking during the sliding process of the cavity plate 3. In addition, the setting of the guide plate 12 can increase the friction between the cavity plate 3 and the cavity plate 3, so that after the cavity plate 3 moves into place, the contact friction between the guide plate 12 and the cavity plate 3 can play a limiting effect, preventing the cavity plate 3 from sliding out automatically, and improving the yield rate of the sample.

[0039] Further, as a preferred embodiment, the lower side wall of the guide plate 2 is located on both sides of the guide groove 13 to form a scraper 14. Figure 4 As shown, the polyurethane raw material overflowing from the mold hole 6 can be scraped out by the scraper 14, and under the movement of the cavity plate 3, the scraper 14 can scrape the excess polyurethane raw material into a cavity formed between the stopper 4, the cavity plate 3 and the guide plate 2 for easy collection.

[0040] When in use, first put the mold into an oven to preheat to a certain temperature, then take it out of the oven, and then pour a proper amount of polyurethane raw material into each mold hole 6 of the cavity plate 3, and the liquid level of the polyurethane raw material exceeds the upper end of each mold hole 6; then push the cavity plate 3 into the cavity groove 5 between the bottom plate 1 and the guide plate 2 until the stop step 11 of the cavity plate 3 abuts against the end surface of the guide plate 2. In the process of pushing the cavity plate 3 in, the excess polyurethane raw material at the upper end of the mold hole 6 is scraped off by the guide plate 2 and accumulated in the cavity formed by the stop block 4, the cavity plate 3 and the guide plate 2. Then put the mold into the oven, and after the polyurethane raw material is solidified, take out the mold from the oven, pull out the cavity plate 3, and take out the prepared sample and the block waste formed by the solidification of the excess polyurethane raw material from the cavity plate 3.

[0041] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A polyurethane physical property sample mold, characterized in that: It includes a base plate, a guide plate, a cavity plate and a stopper, the guide plate is detachably arranged on the base plate, a cavity groove is formed between the guide plate and the base plate, the cavity plate is pullable in the cavity groove and can slide on the base plate, the stopper is arranged at one end of the cavity plate, and a plurality of mold holes of different shapes are opened on the bottom wall of the cavity plate.

2. The polyurethane physical property sample mold according to claim 1, characterized in that: A handle is also included, and the handle is arranged on one end of the stopper away from the cavity plate.

3. The polyurethane physical property sample mold according to claim 1, characterized in that: Both sides of the upper end of the bottom plate extend upward to form convex parts.

4. The polyurethane physical property sample mold according to claim 3, characterized in that: The raised portion is provided with a notch, and the guide plate is detachably mounted in the notch via a connecting piece.

5. The polyurethane physical property sample mold according to claim 1, characterized in that: Both sides of the upper end of the cavity plate extend upward to form two limiting parts.

6. The polyurethane physical property sample mold according to claim 5, characterized in that: One end of the limiting portion close to the stop block protrudes upward to form a stop step, and the stop block is detachably connected to the two stop steps.

7. The polyurethane physical property sample mold according to claim 1, characterized in that: It also includes a guide plate, which is arranged on the inner bottom wall of the cavity plate, and a guide groove is opened on the lower side wall of the guide plate, and the guide groove matches the guide plate.

8. The polyurethane physical property sample mold according to claim 7, characterized in that: The lower side walls of the guide plate are located on both sides of the guide groove to form scrapers.

9. The polyurethane physical property sample mold according to claim 1, characterized in that: A cavity is formed between the stopper, the cavity plate and the guide plate.

10. A method for preparing a polyurethane physical property sample, comprising the polyurethane physical property sample mold according to any one of claims 1 to 9, characterized in that: The preparation method comprises: S1. Place the polyurethane physical property sample mold in an oven and preheat it to a certain temperature, then take it out of the oven; S2. Pour a proper amount of polyurethane raw material into each hole of the cavity plate, and the liquid level of the polyurethane raw material exceeds the upper port of each hole; S3, push the cavity plate into the cavity groove between the bottom plate and the guide plate until the stop step of the cavity plate abuts against the end surface of the guide plate; S4. Then, the polyurethane physical property sample mold is placed in an oven. After the polyurethane raw material is solidified, the polyurethane physical property sample mold is taken out from the oven, the cavity plate is pulled out, and the prepared sample and the block waste formed by the solidification of the excess polyurethane raw material are taken out from the cavity plate.

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