阅读说明：本技术 一种玻璃热弯过程中保护涂层的制备方法 (Preparation method of protective coating in glass hot bending process ) 是由 罗湘南 邱木生 于 2021-09-17 设计创作，主要内容包括：本发明公开了一种玻璃热弯过程中保护涂层的制备方法,涉及化工涂料领域,所述聚氨酯树脂制备时准备低分子量二元醇,再与过量芳族异氰酸酯反应,生成异氰酸酯为端基的预聚物,再同丁二醇扩链,得到热塑弹性体,若用芳族二胺扩链并进一步交联,得到浇铸型弹性体,增加热玻璃在加工时的高强度、抗撕裂、耐磨等特性防止玻璃在热弯曲的时候会导致弯曲程度过大导致破裂或者存在弯曲面不平整现象,该3D热弯玻璃成型保护油墨能解决3D玻璃在热弯成型的外围尺寸精度超差大小边的问题有效降低模具产生的压痕、弧面坍塌的问题,减少压制过程中上提升盖板厂的3D热弯玻璃的良率及出货量,同时延长热弯模具的使用寿命。(The invention discloses a preparation method of a protective coating in a glass hot bending process, which relates to the field of chemical coatings, wherein when polyurethane resin is prepared, low molecular weight dihydric alcohol is prepared, the low molecular weight dihydric alcohol reacts with excessive aromatic isocyanate to generate a prepolymer with isocyanate as a terminal group, then the prepolymer is subjected to chain extension with butanediol to obtain a thermoplastic elastomer, if aromatic diamine is used for chain extension and further crosslinking, a casting type elastomer is obtained, the characteristics of high strength, tear resistance, wear resistance and the like of hot glass during processing are improved, the phenomenon that the glass is broken or has uneven bending surface due to overlarge bending degree or the like during hot bending is prevented, the 3D hot bending glass forming protective ink can solve the problem that the 3D glass is subjected to hot bending forming and has the edge with the size exceeding precision, the problems of indentation and arc surface collapse generated by a mould are effectively reduced, the yield and the output of the 3D hot bending glass of an upper cover plate factory are reduced in the pressing process, meanwhile, the service life of the hot bending die is prolonged.)

1. The preparation method of the protective coating in the glass hot bending process is characterized in that ingredients for forming the material comprise unsaturated polyester resin, polyurethane resin, isophorone, dibasic ester, special epoxy resin, a curing agent, an auxiliary agent and a filler, wherein the proportion of the unsaturated polyester resin is 20-30%, the proportion of the polyurethane resin is 25-35%, the proportion of the isophorone is 15-18%, the proportion of the dibasic ester is 18-20%, the proportion of the special epoxy resin is 20%, the proportion of the curing agent is 6-8%, the proportion of the auxiliary agent is 1-2%, and the proportion of the filler is 5-10%.

2. A method for preparing a protective coating in the glass hot bending process,

the manufacturing steps are as follows: step 1, taking various raw materials to be processed according to the specific gravity of the raw materials, and placing the raw materials on a tray;

step 2, adding unsaturated polyester resin, polyurethane resin, isophorone, dibasic ester, special epoxy resin, curing agent and filler into a beaker, and then placing the beaker on a stirrer to slowly stir and mix;

step 3, adding the auxiliary agent into a beaker to obtain a mixed material;

step 4, rapidly stirring the mixture in a stirrer until the mixture is uniformly mixed to obtain the required material;

arranging and combining the glass sheets 1, 2 and 3 according to the sequence numbers, dipping the glass sheets in the hydrophobic protective sol for 40-45 min, taking out the glass sheets, putting the glass sheets into a hot bending furnace, heating the glass sheets to 350-380 ℃ at the heating rate of 4-6 ℃/min, preheating and roasting the glass sheets for 25-30 min, continuously heating the glass sheets to 750-800 ℃, then uniformly coating protective oil on the surface of the glass sheets, carrying out heat preservation and hot bending for 1.5-3 h, cooling the glass sheets to room temperature, and polishing the glass sheets by using a polishing machine until the surface roughness Ra is 0.05-0.08 mu m to obtain the hot bent glass.

3. The method of claim 1, wherein the step of forming the protective coating comprises: the unsaturated polyester resin is a linear polymer formed by condensation polymerization of saturated dibasic acid, unsaturated dibasic acid and dihydric alcohol, and is diluted by a crosslinking monomer or an active solvent to form a resin solution with a certain viscosity, and the cured resin has good comprehensive performance.

4. The method of claim 1, wherein the step of forming the protective coating comprises: when the polyurethane resin is prepared, low-molecular-weight dihydric alcohol is prepared, and then the low-molecular-weight dihydric alcohol reacts with excessive aromatic isocyanate to generate a prepolymer with isocyanate as a terminal group, and then the prepolymer is subjected to chain extension with butanediol to obtain a thermoplastic elastomer, and if aromatic diamine is used for chain extension and further crosslinking, a casting type elastomer is obtained, so that the characteristics of high strength, tear resistance, wear resistance and the like of hot glass during processing are improved.

5. The method of claim 1, wherein the step of forming the protective coating comprises: the isophorone has higher boiling point and low hygroscopicity, has good dissolving capacity, dispersibility and leveling property, is a good solvent for high polymer materials, can dissolve nitrocellulose, acrylate, alkyd resin, polyester, epoxy resin and the like, increases the dissolving capacity of various raw materials during processing together, and enables the materials to be uniformly mixed together.

6. The method of claim 1, wherein the step of forming the protective coating comprises: the dibasic acid ester is an important high-boiling point solvent and leveling auxiliary agent, has particularly good dissolving capacity for various resins, has good solubility for polyurethane resin, acrylic resin, alkyd resin, epoxy resin and the like, and can improve leveling and luster when protective oil is coated on the surface of glass.

7. The method of claim 1, wherein the step of forming the protective coating comprises: the special epoxy resin is an organic high-molecular polymer containing two epoxy genes in a molecular structure, and the material has good insulating property, mechanical property and chemical stability.

8. The method of claim 1, wherein the step of forming the protective coating comprises: the curing agent is a resin curing process which is an irreversible change process of thermosetting resin through chemical reactions such as condensation, ring closure, addition or catalysis, and the curing is completed by adding a curing (crosslinking) agent, so that the mechanical property, heat resistance, water resistance and corrosion resistance of the mixture are improved.

9. The method of claim 1, wherein the step of forming the protective coating comprises: the stirring speed of the stirrer is 150-180 revolutions per minute, and the rapid stirring speed is 800-850 revolutions per minute.

10. The method of claim 1, wherein the step of forming the protective coating comprises: the protective oil is uniformly coated on the surface of the glass before the glass is required to be subjected to hot bending forming, so that the yield of the glass is increased, and the service life of a mold is prolonged.

Technical Field

The invention relates to the field of chemical coatings, in particular to a preparation method of a protective coating in a glass hot bending process.

Background

The glass hot bending needs to be heated at a constant speed, then the glass is bent at a constant speed by using a hot bending machine, the biggest technical difficulties of the existing hot bending glass are that the straight line edge is bent, the bent angle is easy to generate grinding marks, or the hot bending surface of the glass collapses or the size is uneven, so the hot bending glass has high requirements on the technology in operation, and some hot bending glass can be finished by a professional hot bending furnace.

Disclosure of Invention

The invention aims to provide a preparation method of a protective coating in a glass hot bending process, which aims to solve the technical problems that the most difficult points in the bending hot bending glass in the background art are that a straight edge is bent, a bent angle is easy to generate grinding marks, or the hot bending surface of the glass is collapsed or the size of the glass is not flat.

In order to achieve the purpose, the invention provides the following technical scheme: the preparation method of the protective coating in the glass hot bending process is characterized in that ingredients for forming the material comprise unsaturated polyester resin, polyurethane resin, isophorone, dibasic ester, special epoxy resin, a curing agent, an auxiliary agent and a filler, wherein the proportion of the unsaturated polyester resin is 20-30%, the proportion of the polyurethane resin is 25-35%, the proportion of the isophorone is 15-18%, the proportion of the dibasic ester is 18-20%, the proportion of the special epoxy resin is 20%, the proportion of the curing agent is 6-8%, the proportion of the auxiliary agent is 1-2%, and the proportion of the filler is 5-10%.

A preparation method of a protective coating in a glass hot bending process comprises the following manufacturing steps: step 1, taking various raw materials to be processed according to the specific gravity of the raw materials, and placing the raw materials on a tray;

step 2, adding unsaturated polyester resin, polyurethane resin, isophorone, dibasic ester, special epoxy resin, curing agent and filler into a beaker, and then placing the beaker on a stirrer to slowly stir and mix;

step 3, adding the auxiliary agent into a beaker to obtain a mixed material;

step 4, rapidly stirring the mixture in a stirrer until the mixture is uniformly mixed to obtain the required material;

arranging and combining the glass sheets 1, 2 and 3 according to the sequence numbers, dipping the glass sheets in the hydrophobic protective sol for 40-45 min, taking out the glass sheets, putting the glass sheets into a hot bending furnace, heating the glass sheets to 350-380 ℃ at the heating rate of 4-6 ℃/min, preheating and roasting the glass sheets for 25-30 min, continuously heating the glass sheets to 750-800 ℃, then uniformly coating protective oil on the surface of the glass sheets, carrying out heat preservation and hot bending for 1.5-3 h, cooling the glass sheets to room temperature, and polishing the glass sheets by using a polishing machine until the surface roughness Ra is 0.05-0.08 mu m to obtain the hot bent glass.

Preferably, the unsaturated polyester resin is a linear polymer formed by condensation polymerization of saturated dibasic acid, unsaturated dibasic acid and dihydric alcohol, and is diluted by a crosslinking monomer or an active solvent to form a resin solution with a certain viscosity, and the cured resin has good comprehensive performance.

Preferably, when the polyurethane resin is prepared, low molecular weight diol is prepared, and then reacts with excessive aromatic isocyanate to generate isocyanate-terminated prepolymer, and then the prepolymer is subjected to chain extension with butanediol to obtain a thermoplastic elastomer, and if aromatic diamine is used for chain extension and further crosslinking, a casting type elastomer is obtained, and the characteristics of high strength, tear resistance, wear resistance and the like of hot glass during processing are improved.

Preferably, the isophorone has higher boiling point and low hygroscopicity, has good dissolving capacity, dispersibility and leveling property, is a good solvent for high polymer materials, can dissolve nitrocellulose, acrylate, alkyd resin, polyester, epoxy resin and the like, increases the dissolving capacity of various raw materials during processing together, and enables the materials to be uniformly mixed together.

Preferably, the dibasic acid ester is an important high-boiling point solvent and leveling aid, has particularly good dissolving capacity for various resins, has good solubility for polyurethane resin, acrylic resin, alkyd resin, epoxy resin and the like, and can improve leveling and gloss when protective oil is coated on the surface of glass.

Preferably, the special epoxy resin is an organic high polymer containing two epoxy genes in a molecular structure, and the material has good insulating property, mechanical property and chemical stability.

Preferably, the curing agent is a resin curing agent which is prepared by adding a curing (crosslinking) agent to increase the mechanical property, heat resistance, water resistance and corrosion resistance of the mixture through condensation, ring closure, addition, catalysis or other chemical reactions to cause the irreversible change of the thermosetting resin.

Preferably, the stirring speed of the stirrer is 150-180 revolutions per minute, and the rapid stirring speed is 800-850 revolutions per minute.

Preferably, the protective oil is uniformly coated on the surface of the glass before the glass is required to be subjected to hot bending forming, so that the yield of the glass is increased, and the service life of a mold is prolonged.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, when the polyurethane resin is prepared, low molecular weight dihydric alcohol is prepared, and then the low molecular weight dihydric alcohol reacts with excessive aromatic isocyanate to generate a prepolymer with isocyanate as a terminal group, and then the prepolymer is subjected to chain extension with butanediol to obtain a thermoplastic elastomer, if aromatic diamine is used for chain extension and further crosslinking, a casting type elastomer is obtained, the characteristics of high strength, tear resistance, wear resistance and the like of hot glass during processing are improved, so that the phenomenon that the glass is broken or the curved surface is not flat due to overlarge bending degree during hot bending is prevented, the 3D hot bending glass forming protection ink can solve the problem that the 3D glass is subjected to edge exceeding the peripheral dimensional precision during hot bending forming, the problem that the impression and the arc surface collapse are generated by a mold is effectively reduced, the yield and the output quantity of the 3D hot bending glass of a cover plate factory are improved in the pressing process are reduced, and the service life of the hot bending mold is prolonged.

Drawings

FIG. 1 is a flow chart of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

The embodiment provided by the invention comprises the following steps:

the preparation method of the protective coating in the glass hot bending process is characterized in that ingredients for forming the material comprise unsaturated polyester resin, polyurethane resin, isophorone, dibasic ester, special epoxy resin, a curing agent, an auxiliary agent and a filler, wherein the proportion of the unsaturated polyester resin is 20-30%, the proportion of the polyurethane resin is 25-35%, the proportion of the isophorone is 15-18%, the proportion of the dibasic ester is 18-20%, the proportion of the special epoxy resin is 20%, the proportion of the curing agent is 6-8%, the proportion of the auxiliary agent is 1-2%, and the proportion of the filler is 5-10%.

A preparation method of a protective coating in a glass hot bending process comprises the following manufacturing steps: step 1, taking various raw materials to be processed according to the specific gravity of the raw materials, and placing the raw materials on a tray;

step 2, adding unsaturated polyester resin, polyurethane resin, isophorone, dibasic ester, special epoxy resin, curing agent and filler into a beaker, and then placing the beaker on a stirrer to slowly stir and mix;

step 3, adding the auxiliary agent into a beaker to obtain a mixed material;

step 4, rapidly stirring the mixture in a stirrer until the mixture is uniformly mixed to obtain the required material;

arranging and combining the glass sheets 1, 2 and 3 according to the sequence numbers, dipping the glass sheets in the hydrophobic protective sol for 40-45 min, taking out the glass sheets, putting the glass sheets into a hot bending furnace, heating the glass sheets to 350-380 ℃ at the heating rate of 4-6 ℃/min, preheating and roasting the glass sheets for 25-30 min, continuously heating the glass sheets to 750-800 ℃, then uniformly coating protective oil on the surface of the glass sheets, carrying out heat preservation and hot bending for 1.5-3 h, cooling the glass sheets to room temperature, and polishing the glass sheets by using a polishing machine until the surface roughness Ra is 0.05-0.08 mu m to obtain the hot bent glass.

Furthermore, the unsaturated polyester resin is a linear polymer formed by condensation polymerization of saturated dibasic acid, unsaturated dibasic acid and dihydric alcohol, and is diluted by a crosslinking monomer or an active solvent to form a resin solution with a certain viscosity, and the cured resin has good comprehensive performance and can be well attached to the surface of glass to protect the glass.

Further, when the polyurethane resin is prepared, low molecular weight diol is prepared, and then reacts with excessive aromatic isocyanate to generate isocyanate-terminated prepolymer, and then chain extension is carried out with butanediol to obtain thermoplastic elastomer, if chain extension is carried out with aromatic diamine and further crosslinking is carried out, a casting type elastomer is obtained, the characteristics of high strength, tear resistance, wear resistance and the like of hot glass during processing are improved, and the glass is prevented from being easily broken during hot bending.

Furthermore, the isophorone has higher boiling point and low hygroscopicity, and has good dissolving capacity, dispersibility and leveling property, is a good solvent for high polymer materials, can dissolve nitrocellulose, acrylate, alkyd resin, polyester, epoxy resin and the like, increases the dissolving capacity of various raw materials during processing, enables the materials to be uniformly mixed together, and increases the comprehensive performance of the materials.

Furthermore, the dibasic acid ester is an important high-boiling point solvent and leveling aid, has particularly good dissolving capacity for various resins, has good solubility for polyurethane resin, acrylic resin, alkyd resin, epoxy resin and the like, can improve leveling and luster when protective oil is coated on the surface of glass, keeps the surface luster when the glass is subjected to hot bending, and prevents the situations of collapse and the like.

Furthermore, the special epoxy resin is an organic high-molecular polymer containing two epoxy genes in a molecular structure, and the material has good insulating property, mechanical property and chemical stability.

Furthermore, the curing agent is a resin curing agent which is prepared by adding a curing (crosslinking) agent to the thermosetting resin through chemical reactions such as condensation, ring closure, addition or catalysis, so that the thermosetting resin undergoes an irreversible change process, and the curing is performed to increase the mechanical property, heat resistance, water resistance and corrosion resistance of the mixture, so that the protective oil can be rapidly cured on the surface.

Furthermore, the stirring speed of the stirrer is 150-180 revolutions per minute, and the rapid stirring speed is 800-850 revolutions per minute, so that the condition that the stirring speed is too high or too low during stirring until the materials cannot be stirred together at a constant speed is avoided.

Furthermore, the protective oil is uniformly coated on the surface of the glass before the glass is required to be subjected to hot bending forming, so that the yield of the glass is increased, the service life of a mold is prolonged, and the phenomenon that the glass is broken or uneven is prevented when the glass is subjected to hot bending.

When the glass needs to be uniformly coated with the protective oil during hot bending, the glass sheets 1, 2 and 3 are arranged and combined according to the sequence number and then soaked in the hydrophobic protective sol for 40-45 min, the glass sheets are taken out and then placed into a hot bending furnace, the temperature is raised to 350-380 ℃ at the temperature rise rate of 4-6 ℃/min, the glass sheets are preheated and roasted for 25-30 min, the temperature is continuously raised to 750-800 ℃, then the protective oil is uniformly coated on the surface of the glass, the glass sheets are subjected to heat preservation and hot bending for 1.5-3 h, the glass sheets are polished by a polishing machine after being cooled to the room temperature until the surface roughness Ra is 0.05-0.08 mu m, and the hot bent glass is obtained.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.