Condensed type fluorinated silicone rubber sample mold

Abstract

The utility model discloses a condensed type fluorinated silicone rubber sample mold which comprises a lower seat plate and an upper pressing plate, a lower easy-to-tear layer is arranged on the upper side of the lower seat plate, a forming plate is arranged on the upper side of the lower easy-to-tear layer, at least one vertically-through sample forming notch is formed in the forming plate, an upper easy-to-tear layer is arranged on the upper side of the forming plate, and the upper pressing plate is arranged on the upper side of the upper easy-to-tear layer. During use, after the liquid fluorosilicone rubber is preliminarily cured and formed, the sample preparation body is taken out, the upper pressing plate cover is removed, and the upper easy-to-tear layer is torn off; when the curing degree reaches about 50%, the lower easy-to-tear layer is torn off, and the forming plate and the condensation type fluorinated silicone rubber sample which is not completely cured are placed on a storage rack to be continuously cured till complete curing and forming are achieved; the curing speed is high, and the curing time is short; demolding operation is smoother, a fluorinated silicone rubber sample is not prone to being damaged, the sample quality is stable, rubber does not make contact with the lower base plate and the upper pressing plate, adhesion and corrosion to a mold are prevented, and the requirement for the material of the mold is low.

Description

Technical Field

[0001] The utility model relates to the field of rubber performance testing, in particular to a condensation type fluorosilicone rubber sample mold. Background Art

[0002] Liquid fluorosilicone rubber has become a widely used special rubber due to its excellent comprehensive properties. According to its different curing reaction mechanisms, it can be divided into condensation type and addition type. Among them, condensation type silicone rubber can be divided into dealcoholization type, deacidification type, deoxime type, deamine type, deamidation type, deketone type and other types according to the different by-products of the condensation reaction. Among them, the dealcoholization type condensation adhesive is non-corrosive and more environmentally friendly, and has good bonding effects on various substrates; the deacetone type condensation adhesive has excellent electrical insulation and weather resistance, and is not easily affected by changes in temperature and external environment, but the butanone oxime released during the vulcanization process is corrosive to metals, so it is not suitable for bonding and sealing of metal substrates; the heat resistance of the deacetone type condensation adhesive is the best among various condensation type room temperature vulcanized silicone rubbers, and the short-term temperature resistance can reach more than 300°C, the vulcanization speed is fast, and it has strong bonding to most substrates and can be widely used in high temperature environments; the advantages of the deacetic acid type silicone rubber are lower prices than other types of silicone rubbers, strong bonding to glass, and high transparency, and are suitable as sealing adhesives for glass, tiles, aluminum profiles, etc. Its disadvantages are pungent odor and corrosion to metals.

[0003] In order to detect the performance of liquid fluorosilicone rubber, it is necessary to use a mold to make the liquid fluorosilicone rubber into a thin sheet sample for testing. The existing condensation type fluorosilicone rubber sample mold includes an upper mold and a lower mold. The upper side of the lower mold is provided with a sample groove, and the upper mold cover is provided on the upper side of the lower mold. When in use, the liquid fluorosilicone rubber is filled in the sample groove, and the upper mold is pressed on the upper side of the liquid fluorosilicone rubber. The mold is pressurized using a pressure testing machine or a vulcanizer. After the liquid fluorosilicone rubber is cured and formed, it is taken out to obtain the fluorosilicone rubber sample. The existing condensation type fluorosilicone rubber sample mold has the defect of a long curing time of the condensation type fluorosilicone rubber, and due to the adhesion of the condensation type fluorosilicone rubber, it is difficult to remove the thin sheet fluorosilicone rubber sample from the mold. The removal process is easy to damage the fluorosilicone rubber sample, and the sample quality is unstable, affecting the accuracy of the performance test; because some fluorosilicone rubber samples are corrosive during the preparation process, the requirements for the mold material are high, and the production cost is high. Utility Model Content

[0004] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art and to provide a condensation type fluorosilicone rubber sample mold which has a short curing time, is not prone to damage the fluorosilicone rubber sample during preparation operation, has stable sample quality, and has low requirements on the mold material.

[0005] The technical solution of the utility model is:

[0006] A condensation type fluorosilicone rubber specimen mold, comprising a lower base plate and an upper pressing plate, characterized in that an easily detachable lower layer is provided on the upper side of the lower base plate, a forming plate is provided on the upper side of the easily detachable lower layer, at least one specimen forming notch penetrating up and down is provided on the forming plate, an easily detachable upper layer is provided on the upper side of the forming plate, and the upper pressing plate is arranged on the upper side of the easily detachable upper layer.

[0007] Preferably, the lower base plate, the upper pressing plate and the forming plate are rectangular, and two specimen forming notches are provided on the forming plate.

[0008] Preferably, the easily detachable lower layer and the easily detachable upper layer are rectangular, and the length and / or width of the easily detachable lower layer and the easily detachable upper layer are greater than the length and / or width of the forming plate.

[0009] Further improvement, at least three guiding and positioning columns are provided around the upper side of the lower base plate, and guiding sliding holes matched with the guiding and positioning columns are provided at the positions of the upper pressing plate corresponding to the guiding and positioning columns.

[0010] The guiding and positioning column includes a positioning column and a guiding frustum. The lower end of the positioning column is fixedly connected with the lower base plate, and the lower end of the guiding frustum is fixedly connected with the upper end of the positioning column; the height of the positioning column is greater than the sum of the heights of the easily detachable lower layer, the forming plate and the easily detachable upper layer, and the height of the guiding and positioning column is not greater than the sum of the heights of the easily detachable lower layer, the forming plate, the easily detachable upper layer and the upper pressing plate. The upper end of the guiding and positioning column will not protrude above the upper pressing plate.

[0011] Further improvement, the easily detachable upper layer and the easily detachable lower layer include a release paper layer and a cellophane layer. The release paper layer of the easily detachable lower layer is located on the upper side of the cellophane layer, and the release paper layer of the easily detachable upper layer is located on the lower side of the cellophane layer. The release paper layer and the cellophane layer

[0012] are fixedly connected. The cellophane layer has high strength and plays a role in strengthening the release paper layer. The adhesion between the fluorosilicone rubber and the release paper layer is small and it is easy to peel off.

[0013] Preferably, the release paper layer is made of breathable release paper, such as CCK release paper with good air permeability, which can shorten the molding time of the condensation type fluorosilicone rubber.

[0014] Preferably, the thickness of the release paper layer is 0.05 - 0.1 mm, and the thickness of the cellophane layer is 0.15 - 0.25 mm.

[0015] When the utility model is in use, the lower seat plate is placed horizontally, the lower easy-to-peel layer is laid on the lower seat plate, the forming plate is placed horizontally on the lower easy-to-peel layer, liquid fluorosilicone rubber is filled into the sample forming notch of the forming plate until it protrudes from the upper side of the forming plate, the upper easy-to-peel layer is laid on the upper side of the forming plate, and finally the upper pressing plate is covered and pressed against the upper side of the upper easy-to-peel layer to form a sample preparation body. Use a pressure testing machine or a vulcanizing machine to apply pressure to the lower seat plate and the upper pressing plate. After the liquid fluorosilicone rubber is initially cured and formed, take out the sample preparation body, remove the upper pressing plate cover, and peel off the upper easy-to-peel layer; when the curing degree reaches about 50%, peel off the lower easy-to-peel layer, and place the forming plate together with the incompletely cured condensation-type fluorosilicone rubber sample on the storage rack to continue curing until it is completely cured and formed; during the curing process, the rubber compound can contact the air to the greatest extent, and the moisture in the air can increase the curing speed of the rubber compound, and the curing time is short. The setting of the upper easy-to-peel layer and the lower easy-to-peel layer makes the demolding operation smoother, not easily damage the fluorosilicone rubber sample, the sample quality is stable, the rubber compound does not contact the lower seat plate and the upper pressing plate, preventing adhesion and corrosion to the mold, and the requirement for the mold material is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structure diagram of the utility model.

[0017] Figure 2 is Figure 1 a partially enlarged view of part A of

[0018] Figure 3 is a schematic three-dimensional structure diagram of the utility model after removing the upper pressing plate and the upper easy-to-peel layer.

[0019] Figure 4 is a schematic three-dimensional structure diagram of the upper pressing plate in the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] As Figures 1-4 shown, a condensation-type fluorosilicone rubber sample mold includes a lower seat plate 4 and an upper pressing plate 2. The lower seat plate 4 and the upper pressing plate 2 are rectangular plates. Four guiding and positioning columns distributed in a rectangle are provided around the upper side of the lower seat plate. The upper pressing plate 2 is provided with guiding sliding holes 9 that cooperate with the guiding and positioning columns. The guiding and positioning columns can slide freely in the guiding sliding holes. When the four guiding and positioning columns pass through the four guiding sliding holes 9, the upper pressing plate 2 is located directly above the lower seat plate 4; from Figure 3It can be seen that the guiding and positioning column includes a positioning column 1 and a guiding frustum 8 with a gradually increasing diameter from top to bottom. The lower end of the positioning column 1 is fixedly connected to the lower seat plate 4, and the lower end of the guiding frustum 8 is fixedly connected to the upper end of the positioning column 1. The lower seat plate 4, the positioning column 1, and the guiding frustum 8 are integrally formed. The guiding frustum 8 cooperates with the guiding sliding hole 9 to guide it, enabling the guiding sliding hole to be quickly sleeved on the positioning column 1, thereby improving efficiency. There is a rectangular lower easy-to-peel layer between the two guiding and positioning columns on the left side and the two guiding and positioning columns on the right side on the upper side of the lower seat plate 4. There is a rectangular forming plate 3 on the upper side of the lower easy-to-peel layer. There are two rectangular specimen forming notches 5 that penetrate up and down on the forming plate 3. According to the test standard of the mechanical properties of rubber, the thickness of the forming plate 3 is set to 2 mm. There is a rectangular upper easy-to-peel layer on the upper side of the forming plate 3, and the upper pressing plate is arranged on the upper side of the upper easy-to-peel layer. The height of the positioning column is greater than the sum of the heights of the lower easy-to-peel layer, the forming plate 3, and the upper easy-to-peel layer, and the height of the guiding and positioning column (the sum of the heights of the positioning column and the guiding frustum) is not greater than the sum of the heights of the lower easy-to-peel layer, the forming plate, the upper easy-to-peel layer, and the upper pressing plate; the upper end of the guiding and positioning column will not protrude above the upper pressing plate, which is more conducive to the pressing operation of the pressing testing machine or the vulcanizing machine.

[0021] As can be seen from Figure 1 and Figure 3 it can be seen that the length and width of the lower easy-to-peel layer and the upper easy-to-peel layer are greater than the length and width of the forming plate, and the length and width of the lower easy-to-peel layer and the upper easy-to-peel layer are less than the length and width of the lower seat plate 4 and the upper pressing plate 2. This facilitates the assembly and removal operations of the lower easy-to-peel layer and the upper easy-to-peel layer.

[0022] For further improvement, the upper easy-to-peel layer and the lower easy-to-peel layer include a release paper layer 6 and a glassine paper layer 7. The release paper layer 6 of the lower easy-to-peel layer is located on the upper side of the glassine paper layer 7, and the release paper layer of the upper easy-to-peel layer is located on the lower side of the glassine paper layer. The release paper layer is fixedly connected to the glassine paper layer (by bonding). The glassine paper layer has high strength, which strengthens the release paper layer and prevents the release paper from being damaged during the removal process; the adhesion between the fluorosilicone rubber and the release paper layer is small, making it easy to peel off. The release paper layer is made of breathable release paper, such as CCK release paper with good breathability, which can shorten the molding time of the condensation-type fluorosilicone rubber. The thickness of the release paper layer is 0.05 - 0.15 mm, preferably 0.075 mm; the thickness of the glassine paper layer is 0.15 - 0.25 mm, preferably 0.2 mm; to reduce costs while ensuring its functions.

[0023] When the utility model is in use, the lower seat plate is placed horizontally, the lower easily peelable layer is laid on the lower seat plate, the forming plate is placed horizontally on the lower easily peelable layer, liquid fluorosilicone rubber is filled into the sample forming notch 5 of the forming plate until it protrudes from the upper side of the forming plate, the upper easily peelable layer is laid on the upper side of the forming plate, and finally the upper pressing plate is covered and pressed against the upper side of the upper easily peelable layer to form a sample preparation body. Use a pressure testing machine or a vulcanizer to apply pressure to the lower seat plate and the upper pressing plate. After the liquid fluorosilicone rubber is initially cured and formed (pressurized and cured for about 1 day), take out the sample preparation body, remove the upper pressing plate cover, and peel off the upper easily peelable layer; when the curing degree reaches about 50% (cured for 2 - 3 days), peel off the lower easily peelable layer, and place the forming plate together with the incompletely cured condensation type fluorosilicone rubber sample on the grid-type storage rack to continue curing until completely cured and formed (3 - 5 days after removing the lower easily peelable layer); during the curing process, the rubber compound can contact the air to the greatest extent, and the moisture in the air can increase the curing speed of the rubber compound, and the curing time is short; through comparative experiments, it is obtained that the curing and forming time of the utility model is 7 - 8 days, and the curing and forming time of the condensation type fluorosilicone rubber sample mold used in the prior art is 12 - 15 days. The setting of the upper easily peelable layer and the lower easily peelable layer makes the demolding operation smoother. It only needs to separate the adhesion of a small area around the sample and the inner side wall of the forming plate, and it is not easy to damage the fluorosilicone rubber sample, and the sample quality is stable. The rubber compound does not contact the lower seat plate and the upper pressing plate, preventing adhesion and corrosion of the mold, and the requirement for the mold material is low.

Claims

1. A condensation type fluorosilicone rubber sample mold, comprising a lower base plate and an upper pressing plate, characterized in that: A lower easy-to-peel layer is arranged on the upper side of the lower seat plate, a forming plate is arranged on the upper side of the lower easy-to-peel layer, at least one sample forming notch is arranged on the forming plate, an upper easy-to-peel layer is arranged on the upper side of the upper easy-to-peel layer.

2. The condensation type fluorosilicone rubber sample mold according to claim 1, characterized in that: The lower seat plate, the upper pressing plate and the forming plate are rectangular, and the forming plate is provided with two sample forming notches.

3. The condensation type fluorosilicone rubber sample mold according to claim 1 or 2, characterized in that: The lower easy-to-peel layer and the upper easy-to-peel layer are rectangular, and the length and / or width of the lower easy-to-peel layer and the upper easy-to-peel layer are greater than the length and / or width of the forming plate.

4. The condensation type fluorosilicone rubber sample mold according to claim 1, characterized in that: At least three guide and positioning columns are arranged around the side surface of the lower seat plate, and guide sliding holes cooperating with the guide and positioning columns are arranged on the upper pressure plate at positions opposite to the guide and positioning columns.

5. The condensation type fluorosilicone rubber sample mold according to claim 4, characterized in that: The guide positioning column includes a positioning column and a guide cone, the lower end of the positioning column is fixedly connected to the lower seat plate, and the lower end of the guide cone is fixedly connected to the upper end of the positioning column; the height of the positioning column is greater than the sum of the heights of the lower easy-to-peel layer, the forming plate and the upper easy-to-peel layer, and the height of the guide positioning column is not greater than the sum of the heights of the lower easy-to-peel layer, the forming plate, the upper easy-to-peel layer and the upper pressure plate.

6. The condensation type fluorosilicone rubber sample mold according to claim 1, characterized in that: The upper easy-to-peel layer and the lower easy-to-peel layer include a release paper layer and a cellophane layer. The release paper layer of the lower easy-to-peel layer is located on the upper side of the cellophane layer, and the release paper layer of the upper easy-to-peel layer is located on the lower side of the cellophane layer. The release paper layer is fixedly connected to the cellophane layer.

7. The condensation type fluorosilicone rubber sample mold according to claim 6, characterized in that: The release paper layer is made of air-permeable release paper.

8. The condensation type fluorosilicone rubber sample mold according to claim 6 or 7, characterized in that: The thickness of the release paper layer is 0.05-0.1 mm, and the thickness of the glass paper layer is 0.15-0.25 mm.

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