CN113354262A - Degreasing process of glass injection molding blank and preparation method of glass product - Google Patents
Degreasing process of glass injection molding blank and preparation method of glass product Download PDFInfo
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- CN113354262A CN113354262A CN202110859424.3A CN202110859424A CN113354262A CN 113354262 A CN113354262 A CN 113354262A CN 202110859424 A CN202110859424 A CN 202110859424A CN 113354262 A CN113354262 A CN 113354262A
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- C03—GLASS; MINERAL OR SLAG WOOL
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- C03B19/00—Other methods of shaping glass
- C03B19/06—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction
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Abstract
The embodiment of the application provides a degreasing process of a glass injection molding blank and a preparation method of a glass product, wherein the degreasing process of the glass injection molding blank comprises the following steps: keeping the glass injection molding blank at the temperature of between 100 and 180 ℃ for 0.5 to 1.5 hours for pre-degreasing treatment; after the pre-degreasing treatment, gradually heating the glass injection molding blank to 420-480 ℃ for 24-48 hours for degreasing treatment. The degreasing process of the glass injection molding blank body provided by the embodiment of the application can fully discharge organic matters in the glass injection molding blank body through the combination of the pre-degreasing treatment stage and the degreasing treatment stage, and enables the glass injection molding blank body to have certain strength and generate certain shrinkage deformation after degreasing through the process design of the degreasing treatment stage, so that the glass injection molding blank body is prevented from cracking in the later cooling process.
Description
Technical Field
The application relates to the technical field of glass product processing, in particular to a degreasing process of a glass injection molding blank and a preparation method of a glass product.
Background
The glass injection molding process is a brand new glass molding method, and the glass injection molding raw material is prepared by mixing, drying and granulating organic adhesive and glass inorganic materials at a certain temperature. In the injection molding process, glass injection molding raw materials need to be converted into a molten state in a heating mode and have certain fluidity, and a molded glass injection molding blank is obtained through the setting of the injection molding process and the matching of an injection molding machine and a mold. And then carrying out low-temperature degreasing on the molded glass injection molding blank body in a tunnel kiln by normal-pressure heating or vacuum heating, taking out the glass injection molding blank body from the kiln, and sintering the degreased glass injection molding blank body at high temperature in a tunnel kiln by heating again to finally obtain a finished product. Degreasing refers to a process of transferring heat to the embryo body by heating, and discharging the heated organism out of the embryo body. If the glass injection molding blank is not degreased, the subsequent sintering of the glass injection molding blank is affected, so that the subsequent sintering cannot be densified, and further the product quality is affected.
Disclosure of Invention
The embodiment of the application provides a degreasing process of a glass injection molding blank and a preparation method of a glass product.
In a first aspect, an embodiment of the present application provides a degreasing process for a glass injection molding blank, including:
keeping the glass injection molding blank at the temperature of between 100 and 180 ℃ for 0.5 to 1.5 hours for pre-degreasing treatment;
after the pre-degreasing treatment, gradually heating the glass injection molding blank to 420-480 ℃ for 24-48 hours for degreasing treatment.
In a first aspect, embodiments herein provide a method of making a glass article, comprising:
providing raw materials, wherein the raw materials comprise a glass-based inorganic material and an organic binder;
heating the raw materials to a molten state, and injecting the raw materials into a mold to obtain a glass injection molding blank;
degreasing the glass injection molding blank according to the degreasing process of the glass injection molding blank;
and sintering the degreased glass injection molding blank to obtain a glass product.
The degreasing process of the glass injection molding blank body provided by the embodiment of the application can fully discharge organic matters in the glass injection molding blank body through the combination of the pre-degreasing treatment stage and the degreasing treatment stage, and enables the glass injection molding blank body to have certain strength and generate certain shrinkage deformation after degreasing through the process design of the degreasing treatment stage, so that the glass injection molding blank body is prevented from cracking in the later cooling process.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a flowchart of a degreasing process for a glass injection molding blank according to an embodiment of the present disclosure.
Fig. 2 is a flow chart of a method of making a glass article provided in an embodiment of the present application.
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. It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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.
Referring to fig. 1, fig. 1 is a flowchart illustrating a degreasing process for a glass injection molding blank according to an embodiment of the present disclosure. The degreasing process of the glass injection molding blank body can comprise the following steps:
110, preserving the temperature of the glass injection molding blank for 0.5 to 1.5 hours at the temperature of between 100 and 180 ℃ for pre-degreasing treatment;
120, after pre-degreasing, gradually heating the glass injection molding blank to 420-480 ℃ for degreasing after 24-48 hours.
The pre-degreasing treatment stage arranged in the embodiment of the application can open the glue discharging channel on the surface layer of the glass injection molding blank (namely, the glue discharging channel which is heated within the range of 100-180 ℃ to carbonize organic matters on the surface layer of the glass injection molding blank to generate micro air holes), and prepares for further heating and degreasing, so that the conditions that the inner layer of the glass injection molding blank is not smoothly discharged to cause insufficient glue discharging and large shrinkage deformation of the glass injection molding blank after the glass injection molding blank rapidly enters the high-temperature stage for glue discharging are prevented. In the degreasing treatment stage, organic matters in the glass injection molding blank can be fully discharged, the stage belongs to a key stage aiming at the glass injection molding blank with higher organic matter content, the process time is not too short (not less than 24 hours), otherwise, insufficient glue discharge can be caused.
After pre-degreasing, the rubber discharge amount of the glass injection molding blank is usually 5 to 10 percent.
After degreasing, the rubber discharge amount of the glass injection molding blank can reach 98.5-99.95 percent generally, namely, full degumming is realized.
It should be understood that, in the present application, degreasing, degumming and degumming refer to the removal and discharge of organic matters from the glass injection molding blank, and the amount of degumming refers to the discharge amount of organic matters (organic binder).
For example, in the degreasing process of the glass injection molding blank provided by the embodiment of the present application, the glass injection molding blank is placed on a setter plate, and then placed in a heating furnace to perform the whole degreasing process.
The degreasing process of the glass injection molding blank body provided by the embodiment of the application can fully discharge organic matters in the glass injection molding blank body through the combination of the pre-degreasing treatment stage and the degreasing treatment stage, and enables the glass injection molding blank body to have certain strength and generate certain shrinkage deformation after degreasing through the process design of the degreasing treatment stage, so that the glass injection molding blank body is prevented from cracking in the later cooling process.
Illustratively, the temperature of the pre-degreasing process may be 100 ℃, 102 ℃, 105 ℃, 108 ℃, 110 ℃, 113 ℃, 115 ℃, 117 ℃, 120 ℃, 122 ℃, 125 ℃, 128 ℃, 130 ℃, 132 ℃, 135 ℃, 138 ℃, 140 ℃, 143 ℃, 145 ℃, 147 ℃, 150 ℃, 152 ℃, 155 ℃, 158 ℃, 160 ℃, 163 ℃, 165 ℃, 167 ℃, 170 ℃, 172 ℃, 175 ℃, 178 ℃, 180 ℃ or the like, and the incubation time may be 0.5 hour, 0.6 hour, 0.7 hour, 0.8 hour, 0.9 hour, 1 hour, 1.1 hour, 1.2 hour, 1.3 hour, 1.4 hour, 1.5 hour or the like.
Illustratively, the temperature rise time of the degreasing process may be 24 hours, 25 hours, 26 hours, 27 hours, 28 hours, 29 hours, 30 hours, 31 hours, 32 hours, 33 hours, 34 hours, 35 hours, 36 hours, 37 hours, 38 hours, 39 hours, 40 hours, 41 hours, 42 hours, 43 hours, 44 hours, 45 hours, 46 hours, 47 hours, 48 hours, etc., and the temperature rise end point of the degreasing process may be 420 ℃, 430 ℃, 440 ℃, 450 ℃, 460 ℃, 470 ℃, 480 ℃, etc.
The raw material of the glass preform may include a glass-based inorganic material and an organic binder (i.e., organic matter), and generally, the content of the organic binder in the raw material of the glass preform is not more than 30 wt%. It can be understood that the organic binder mainly plays a role in promoting glass inorganic materials to be bonded together so as to be beneficial to forming the glass injection molding blank, but the existence of the organic binder in the glass injection molding blank can cause the glass injection molding blank not to be densified in the subsequent sintering process, so that the quality of the product is affected. In order to make the raw material have better fluidity after being heated and melted to facilitate injection molding, the content of the organic binder in the raw material is generally set to 10 wt% to 30 wt%, for example, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, etc., however, the higher organic material addition amount may cause certain difficulty to the degreasing process, and specifically, the problems of easy cracking, deformation, insufficient glue discharge, large shrinkage deformation, etc. of the degreased blank body are presented. According to the degreasing process of the glass injection molding blank, the combination of the pre-degreasing treatment stage and the degreasing treatment stage is adopted, so that when the content of the organic binder in the raw material is 10 wt% -30 wt%, the organic binder in the raw material can be fully removed, the strength of the degreased glass injection molding blank is improved, and the problems that the glass injection molding blank is easy to crack and deform, the glue discharging is insufficient and the shrinkage deformation is large after being degreased are effectively solved.
Illustratively, the organic binder may be polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyethylene glycol (PEG), or the like.
For example, the glass-based inorganic material may be a silica single component, and when the raw material of the glass injection molding blank only includes silica and an organic binder, the sintered product of the glass injection molding blank is quartz glass (non-strengthened glass), and in this case, the glass injection molding blank is a quartz glass injection molding blank. It is understood that the glass-based inorganic material may contain metal ions (e.g., lithium ions, sodium ions, potassium ions, aluminum ions, etc.) in addition to silica, so that the sintered product of the glass injection molded blank made from the raw material is a strengthened glass.
The degreasing process of the glass injection molding preform may include, before the pre-degreasing process is performed:
the glass injection molding blank is gradually heated to 100-180 ℃ from room temperature for 0.5-1 hour for preheating.
Because the content of organic matters in the glass injection molding blank is high, the residual stress in the glass injection molding blank after injection molding is relatively high, at the moment, the glass injection molding blank can slowly receive heat by adopting the preheating process, so that the residual stress in the glass injection molding blank can be slowly released, and the problem that the glass injection molding blank is easy to crack and deform after degumming due to the fact that the residual stress cannot be fully released in a degreasing process is solved.
After preheating, the rubber discharge amount of the glass injection molding blank is usually 3-5%.
Illustratively, the temperature rise time during the preheating process can be controlled to be 0.5 hour, 0.6 hour, 0.7 hour, 0.8 hour, 0.9 hour, 1 hour, etc., and the end point temperature of the preheating process can be 100 ℃, 102 ℃, 105 ℃, 108 ℃, 110 ℃, 113 ℃, 115 ℃, 117 ℃, 120 ℃, 122 ℃, 125 ℃, 128 ℃, 130 ℃, 132 ℃, 135 ℃, 138 ℃, 140 ℃, 143 ℃, 145 ℃, 147 ℃, 150 ℃, 152 ℃, 155 ℃, 158 ℃, 160 ℃, 163 ℃, 165 ℃, 167 ℃, 170 ℃, 172 ℃, 175 ℃, 178 ℃, 180 ℃, etc.
It can be understood that the temperature in the pre-degreasing process after preheating is the highest temperature after temperature rise in the preheating process.
The room temperature refers to an ambient temperature before the start of the degreasing process, and may be, for example, 26 ℃ to 38 ℃, such as 26 ℃, 27 ℃, 28 ℃, 29 ℃, 30 ℃, 31 ℃, 32 ℃, 33 ℃, 34 ℃, 35 ℃, 36 ℃, 37 ℃, 38 ℃ and the like.
After the degreasing treatment, the degreasing process of the glass injection molding blank may further include:
the glass injection molding blank is gradually heated to 580-650 ℃ for 3-5 hours, and then is subjected to heat preservation for 1-3 hours for pre-sintering.
The glass injection molding blank is subjected to full glue removal (degreasing) and then enters a pre-sintering process, and the process can ensure that the glass injection molding blank can produce certain shrinkage while completely removing glue, so that the degreased strength of the glass injection molding blank is improved; meanwhile, the blank body can be heated more uniformly in the heat preservation process in the pre-burning stage, and the situation that the shrinkage degree of different areas of the blank body is different due to the fact that temperature difference is generated at different positions after the glass injection molding blank body is degummed is avoided.
After the pre-firing, the shrinkage of the glass injection molded body is about 1%.
Illustratively, the temperature rise time in the pre-firing process may be 3 hours, 3.1 hours, 3.2 hours, 3.3 hours, 3.4 hours, 3.5 hours, 3.6 hours, 3.7 hours, 3.8 hours, 3.9 hours, 4 hours, 4.1 hours, 4.2 hours, 4.3 hours, 4.4 hours, 4.5 hours, 4.6 hours, 4.7 hours, 4.8 hours, 4.9 hours, 5 hours, etc.; the end point temperature of the pre-firing step may be 580 ℃, 590 ℃, 600 ℃, 610 ℃, 620 ℃, 630 ℃, 640 ℃, 650 ℃ or the like, and the heat-retaining time may be 1 hour, 1.1 hour, 1.2 hour, 1.3 hour, 1.4 hour, 1.5 hour, 1.6 hour, 1.7 hour, 1.8 hour, 1.9 hour, 2 hours, 2.1 hour, 2.2 hour, 2.3 hour, 2.4 hour, 2.5 hour, 2.6 hour, 2.7 hour, 2.8 hour, 2.9 hour, 3 hour or the like.
After the pre-firing, the degreasing process of the glass injection molding blank may further include: and cooling the glass injection molding blank to room temperature.
The step of cooling the glass injection molding blank to room temperature can be carried out in a heating furnace, namely, after the heating furnace stops heating, a hearth door is opened, so that the glass injection molding blank is naturally cooled, the cooling time is usually more than or equal to 5 hours, and the specific cooling time is determined according to the product structure and the wall thickness. It is understood that the cooling rate of the glass preform cannot be too high, otherwise the glass preform is liable to crack, and the cooling rate of the glass preform is controlled to be not more than 50 ℃ per hour, for example.
When the glass injection molding blank is a quartz glass injection molding blank, the degreasing process of the glass injection molding blank may include:
gradually heating the glass injection molding blank body from room temperature to 165 ℃ for 1 hour for preheating;
after preheating, the glass injection molding blank is subjected to heat preservation at 165 ℃ for 1.5 hours for pre-degreasing treatment;
after pre-degreasing treatment, gradually heating the glass injection molding blank to 480 ℃ for degreasing treatment after 48 hours;
after degreasing treatment, gradually heating the glass injection molding blank to 620 ℃ for 3 hours, and then preserving heat for 3 hours for pre-sintering;
after the pre-firing, the glass injection molded body was cooled to room temperature. For example, the cooling rate of the glass preform may be controlled to 40 to 50 ℃ per hour.
When the glass injection molding blank is a quartz glass injection molding blank, the degreasing process of the glass injection molding blank may also include:
gradually raising the temperature of the glass injection molding blank from room temperature to 170 ℃ for 0.5 hour for preheating;
after preheating, the glass injection molding blank is subjected to pre-degreasing treatment at the temperature of 170 ℃ for 0.8 hour;
after pre-degreasing treatment, gradually heating the glass injection molding blank to 350 ℃ for 36 hours to perform degreasing treatment;
after degreasing treatment, gradually heating the glass injection molding blank to 600 ℃ for 4 hours, and then preserving heat for 2 hours for pre-sintering;
after the pre-firing, the glass injection molded body was cooled to room temperature. For example, the cooling rate of the glass preform may be controlled to 30 to 40 ℃ per hour.
When the glass injection molding blank is a quartz glass injection molding blank, the degreasing process of the glass injection molding blank may further include:
gradually raising the temperature of the glass injection molding blank from room temperature to 160 ℃ for 0.7 hour for preheating;
after preheating, the glass injection molding blank is subjected to heat preservation at 160 ℃ for 1 hour for pre-degreasing treatment;
after pre-degreasing treatment, gradually heating the glass injection molding blank to 420 ℃ for 24 hours for degreasing treatment;
after degreasing treatment, gradually heating the glass injection molding blank to 650 ℃ for 5 hours, and then preserving heat for 3 hours for pre-sintering;
after the pre-firing, the glass injection molded body was cooled to room temperature. Illustratively, the cooling rate of the glass preform may be controlled to be 30 to 35 ℃ per hour.
In summary, according to the degreasing process for the glass injection molding blank provided by the embodiment of the application, the degreasing process is adjusted according to the characteristics of the glass injection molding blank, and the process parameters in the processes of preheating, pre-degreasing, degreasing and pre-burning are further optimized, so that the residual stress of the glass injection molding blank in the degreasing process is released, organic matters in the glass injection molding blank are fully discharged, the strength of the degreased glass injection molding blank is improved, the problems of easiness in cracking, deformation, insufficient glue discharge and large shrinkage deformation of the degreased glass injection molding blank are effectively solved, and the yield of products is further improved.
Referring to fig. 2, fig. 2 is a flowchart of a method for manufacturing a glass product according to an embodiment of the present disclosure. The method of making a glass article may comprise:
210, providing raw materials, wherein the raw materials comprise a glass inorganic material and an organic binder;
220, heating the raw materials to a molten state, and injecting the raw materials into a mold to obtain a glass injection molding blank;
230, degreasing the glass injection molding blank according to the degreasing process of the glass injection molding blank;
and 240, sintering the degreased glass injection molding blank to obtain a glass product.
It can be understood that the raw materials used in the method for manufacturing a glass product provided in the embodiments of the present application are the same as the raw materials of the glass injection molded blank mentioned in the above-mentioned degreasing process of the glass injection molded blank, and are not described herein again.
The degreasing process of the glass injection molding blank and the preparation method of the glass product provided by the embodiment of the application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A degreasing process of a glass injection molding blank is characterized by comprising the following steps:
keeping the glass injection molding blank at the temperature of between 100 and 180 ℃ for 0.5 to 1.5 hours for pre-degreasing treatment;
after the pre-degreasing treatment, gradually heating the glass injection molding blank to 420-480 ℃ for 24-48 hours for degreasing treatment.
2. The degreasing process of the glass injection molding blank according to claim 1, wherein the degreasing process of the glass injection molding blank comprises, before the pre-degreasing treatment:
and gradually raising the temperature of the glass injection molding blank to 100-180 ℃ from room temperature for 0.5-1 hour for preheating.
3. The degreasing process for a glass injection molding blank according to claim 2, wherein the room temperature is 26 ℃ to 38 ℃.
4. The degreasing process of a glass injection molding blank according to claim 1, wherein the degreasing process of the glass injection molding blank further comprises, after the degreasing process, the steps of:
and gradually heating the glass injection molding blank to 580-650 ℃ for 3-5 hours, and then preserving heat for 1-3 hours for pre-sintering.
5. The degreasing process for a glass injection molding blank according to claim 4, wherein the degreasing process for a glass injection molding blank further comprises, after the pre-firing, the steps of: and cooling the glass injection molding blank to room temperature.
6. The degreasing process for a glass injection molding blank according to claim 5, wherein the cooling rate of the glass injection molding blank is not more than 50 ℃ per hour.
7. The degreasing process for a glass injection molding blank according to claim 1, wherein the raw material of the glass injection molding blank comprises a glass-based inorganic material and an organic binder, and the content of the organic binder in the raw material is not more than 30 wt%.
8. The degreasing process for a glass injection molding blank according to claim 7, wherein the glass-based inorganic material is silica single component.
9. The degreasing process for a glass injection molding blank according to claim 8, wherein when the glass injection molding blank is a quartz glass injection molding blank, the degreasing process for the glass injection molding blank comprises:
gradually heating the glass injection molding blank body from room temperature to 165 ℃ for 1 hour for preheating;
after preheating, the glass injection molding blank is subjected to heat preservation at 165 ℃ for 1.5 hours for pre-degreasing treatment;
after pre-degreasing treatment, gradually heating the glass injection molding blank to 480 ℃ for 48 hours to perform degreasing treatment;
after degreasing treatment, gradually heating the glass injection molding blank to 620 ℃ for 3 hours, and then preserving heat for 3 hours for pre-sintering;
after the pre-firing, the glass injection molded body is cooled to room temperature.
10. A method of making a glass article, comprising:
providing raw materials, wherein the raw materials comprise a glass-based inorganic material and an organic binder;
heating the raw materials to a molten state, and injecting the raw materials into a mold to obtain a glass injection molding blank;
degreasing the glass preform according to the degreasing process of the glass preform according to any one of claims 1 to 9;
and sintering the degreased glass injection molding blank to obtain a glass product.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080164631A1 (en) * | 2005-02-14 | 2008-07-10 | Shin-Etsu Quartz Products Co., Ltd | Process for Producing Silica Glass Product |
| CN109650910A (en) * | 2017-10-11 | 2019-04-19 | 蓝思科技（长沙）有限公司 | The degreasing process and application thereof of load bearing board and zirconia ceramics injection molding idiosome |
-
2021
- 2021-07-28 CN CN202110859424.3A patent/CN113354262A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080164631A1 (en) * | 2005-02-14 | 2008-07-10 | Shin-Etsu Quartz Products Co., Ltd | Process for Producing Silica Glass Product |
| CN109650910A (en) * | 2017-10-11 | 2019-04-19 | 蓝思科技（长沙）有限公司 | The degreasing process and application thereof of load bearing board and zirconia ceramics injection molding idiosome |
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