TWI392650B - Composition for increasing thermal tolerance of object and preparing method thereof - Google Patents

Description

Composition for increasing high temperature tolerance of articles and preparation method thereof

The present invention relates to a composition and a preparation method thereof, and more particularly to a composition for increasing the high temperature tolerance of an object and a preparation method thereof.

Rapid Prototyping (RP technology) is developed based on the concept of stacking layers of pyramids. The main technical feature is the rapidity of molding. It can be used without any tools, molds and fixtures. Automatically and quickly convert any complex shape design into a 3D solid model, which greatly shortens the development cycle of new products and reduces research and development costs, ensuring the time to market for new products and the success rate of new product development. A more complete and convenient product design communication tool between technicians and non-technical personnel such as technical decision makers and product users, thus significantly improving the competitiveness of products in the market and the market to the market. Rapid response capability.

At present, RP technology has developed a 3D solid model by using jet printing technology combined with the precise positioning technology of the carrier. The production method is to first lay a layer of powder on top of the carrier and spray it on part of the powder by inkjet printing technology. The high-viscosity adhesive liquid is printed to make the glue liquid adhere to the powder and solidify. The 3D solid model can be completed by repeating the above process layer stacking.

However, the 3D solid model completed by the adhesion of the binder liquid to the powder tends to have the disadvantage of insufficient strength, and the high temperature tolerance is poor, so that the finished article is easily damaged during the subsequent high temperature sintering process. Therefore, how to improve the lack of the above-mentioned prior art and improve the high temperature tolerance and strength of the finished article is an urgent problem to be solved.

The main purpose of the present invention is to provide a composition for increasing the high temperature tolerance of the object, for immersing or coating the object to be treated at a high temperature, so as to increase the high temperature tolerance of the object and avoid damage of the object in the high temperature process.

In order to achieve the above object, one of the broader aspects of the present invention provides a composition for increasing the high temperature tolerance of an article comprising a ceria precursor and a titanium dioxide precursor mixed in a molar ratio of 0.3-5.7:1. Wherein the preparation of the cerium oxide precursor is carried out by mixing a tetraalkyl siloxane with ethanol and water in a weight ratio of 1:4:2, and the preparation of the titanium dioxide precursor is a tetraalkyl titanate. It is mixed with ethanol in a weight ratio of 1:4.

In order to achieve the above object, another broad aspect of the present invention provides a method for preparing a composition for increasing the high temperature tolerance of an article, which comprises the steps of: treating a tetraalkyl siloxane with ethanol and water at 1: Mixing 4:2 by weight, adjusting the pH to pH less than 7 with hydrochloric acid, and stirring at room temperature for 2 hours to form a ceria precursor; the tetraalkyl titanate and ethanol are 1: 4, the weight ratio is mixed, the pH is adjusted to pH value less than 7 with hydrochloric acid, and stirred at room temperature for 0.5 hours to form a titanium dioxide precursor; and the ceria precursor and the titanium dioxide precursor are 0.3- The molar ratio of 5.7:1 was mixed and stirred for 1 hour.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in the various aspects of the present invention, and the description and illustration are in the nature of

The present invention provides a composition for increasing the high temperature tolerance of an object, and a preparation method thereof, which is a two-component type post-treatment agent, which can be used for soaking or coating the gypsum body of the 3D rapid prototyping article to increase the high temperature resistance of the gypsum body. The degree of acceptance and strength will prevent the gypsum body from deforming or melting during the subsequent high-temperature sintering process.

The two dosage forms of the aftertreatment agent are mainly composed of a SiO ₂ precursor and a TiO ₂ precursor, which can generate a sol-gel reaction at a high temperature to form a second a network structure of cerium oxide-titanium dioxide colloid (SiO ₂ -TiO ₂ gel) (as shown in the first figure), which can exist and maintain its shape between the voids of the gypsum body (CaSO ₄ ), making it at a high temperature It does not deform or melt underneath, so it can be applied to articles that require high temperature processing (such as high temperature sintering or high temperature molding).

The preparation method of the composition of the composition for increasing the high temperature tolerance of the article in the present invention will be described in detail below.

First, tetraalkyl decane (Si(OR) ₄ ) and tetraalkyl titan (Ti(OR) ₄ ) were used for pretreatment to form SiO ₂ precursor and TiO ₂ precursor. (TiO ₂ precursor), wherein the R group in the tetraalkyl siloxane (Si(OR) ₄ ) may be methyl (CH ₃ ), ethyl (CH ₂ CH ₃ ), propyl ((CH _{2 2} CH ₃ ) or butyl ((CH ₂ ) ₃ CH ₃ ), that is, the aforementioned tetraalkyl decane (Si(OR) ₄ ) may be selected from Tetramethyl Orthosilicate, tetraethyl Tetraethyl Orthosilicate, Tetrapropyl OrthoSilicate, Tetrabutyl Orthosilicate or a combination thereof, and tetraalkyltitanate (Ti(OR) ₄ ) The R group may be methyl (CH ₃ ), ethyl (CH ₂ CH ₃ ), propyl ((CH ₂ ) ₂ CH ₃ ) or butyl ((CH ₂ ) ₃ CH ₃ ), that is, the aforementioned tetraalkyl The base titanate (Ti(OR) ₄ ) may be selected from the group consisting of Tetramethyl Orthotitanate, Tetraethyl Orthotitanate, Tetrapropyl Orthotitanate, Tetrabutyl Tetrabutyl Orthotitanate or a combination thereof.

The aforementioned tetraalkyl siloxane (Si(OR) ₄ ) is treated with a tetraalkyl siloxane (Si(OR) ₄ ) and ethanol (C ₂ H ₅ OH) and water (H ₂ O) at 1: After mixing at a weight ratio of 4:2, the pH is adjusted to a pH of less than 7, preferably 0.2-2 with hydrochloric acid (HCl), and stirred at room temperature for 2 hours to form a cerium oxide precursor ( SiO ₂ precursor).

The foregoing tetraalkyl titanate (Ti(OR) ₄ ) is previously treated by mixing tetraalkyl titanate (Ti(OR) ₄ ) with ethanol (C ₂ H ₅ OH) in a weight ratio of 1:4. The pH is adjusted with hydrochloric acid (HCl) to a pH of less than 7, and preferably 0.2-2, and stirred at room temperature for 0.5 hours to form a titanium dioxide precursor (TiO ₂ precursor).

Next, the foregoing SiO ₂ precursor and TiO ₂ precursor are mixed at a molar ratio of 0.3-5.7:1, and stirred for 1 hour, thereby forming a high temperature tolerance of the article. Composition of degrees.

Thereafter, the gypsum body of the finished article finished by the 3D rapid prototyping technique can be post-treated with the foregoing composition, for example, by immersion or coating, but not limited thereto, and the immersion method is preferred.

Please refer to the second drawing A and B, wherein the second drawing A is a schematic view of the gypsum main body after the post-treatment of the composition of the present invention, and the second drawing B is a schematic view of the gypsum main body of the second drawing A after high-temperature sintering. As shown in the second panel A, after the gypsum body is post-treated with the composition of the present invention, the composition 20 will be present in the gap between the gypsum powders 10, and as shown in the second panel B, when high temperature is applied (for example, 300- At 1000 ° C), the composition 20 undergoes a sol-gel reaction to form a network structure of SiO ₂ -TiO ₂ gel between the voids of the gypsum powder 10 This maintains the shape of the main body of the gypsum so that it does not deform or melt at high temperatures, thereby increasing the high temperature tolerance and strength of the finished article.

In summary, the present invention provides a composition for increasing the high temperature tolerance of an object and a preparation method thereof, and mainly uses a tetraalkyl decane (Si(OR) 4) and a tetraalkyl titan (Ti(OR). 4) pre-treatment to separately form the cerium oxide precursor and the titanium dioxide precursor, and then mix and stir the cerium oxide precursor and the titanium dioxide precursor in an appropriate molar ratio, thereby obtaining the high temperature tolerance of the object in the present case. The composition can be used to soak or coat the object to be treated at a high temperature to increase the high temperature tolerance of the object and prevent the object from being damaged in the high temperature process.

Therefore, the composition of the high temperature tolerance of the object and the preparation method thereof are extremely industrial value, and the application is made according to law.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

10. . . Gypsum powder

20. . . Composition

First figure: Schematic diagram of the network structure of cerium oxide-titanium dioxide colloid (SiO ₂ -TiO ₂ gel).

Figure 2A is a schematic view of the gypsum body after post-treatment with the composition of the present invention.

Figure B is a schematic view of the gypsum body of Figure 2A after high temperature sintering.

Claims (11)

A composition for increasing the high temperature tolerance of an article, comprising a ceria precursor and a titania precursor mixed in a molar ratio of 0.3-5.7:1, wherein the ceria precursor is prepared by a tetraalkyl group The siloxane is mixed with ethanol and water in a weight ratio of 1:4:2, and the titanium dioxide precursor is prepared by mixing a tetraalkyltitanium oxide with ethanol in a weight ratio of 1:4. The composition for increasing the high temperature tolerance of the article according to the first aspect of the invention, wherein the tetraalkyl siloxane has a chemical formula of Si(OR) ₄ and R is a methyl group, an ethyl group, a propyl group or a butyl group. . A composition for increasing the high temperature tolerance of an object according to claim 1, wherein the ceria precursor is prepared by adjusting the pH to a pH of less than 7 with hydrochloric acid. The composition for increasing the high temperature tolerance of the article as described in claim 3, wherein the pH is preferably 0.2-2. The composition for increasing the high temperature tolerance of the article according to the first aspect of the invention, wherein the preparation of the ceria precursor is stirred at room temperature for 2 hours. The composition for increasing the high temperature tolerance of the article according to the first aspect of the invention, wherein the tetraalkyl titanate has a chemical formula of Ti(OR) ₄ and R is a methyl group, an ethyl group, a propyl group or a butyl group. . A composition for increasing the high temperature tolerance of an article according to claim 1, wherein the titanium dioxide precursor is prepared by adjusting the pH to a pH of less than 7 with hydrochloric acid. A composition for increasing the high temperature tolerance of an article as described in claim 7 wherein the pH is preferably 0.2-2. A composition for increasing the high temperature tolerance of an article as described in claim 1, wherein the titanium dioxide precursor is prepared by stirring at room temperature for 0.5 hours. The composition for increasing the high temperature tolerance of the article according to the first aspect of the invention, wherein the cerium oxide precursor and the titanium dioxide precursor are mixed and stirred for 1 hour. The invention relates to a method for preparing a composition for increasing the high temperature tolerance of an object, which comprises the steps of: mixing a tetraalkylphosphonane with ethanol and water in a weight ratio of 1:4:2, and adjusting the pH with hydrochloric acid to The pH is less than 7, and is stirred at room temperature for 2 hours to form a ceria precursor; the tetraalkyl titanal is mixed with ethanol in a weight ratio of 1:4, and the pH is adjusted to pH with hydrochloric acid. Less than 7, and stirred at room temperature for 0.5 hours to form a titanium dioxide precursor; and the ceria precursor and the titanium dioxide precursor were mixed at a molar ratio of 0.3 to 5.7:1 and stirred for 1 hour.