CN104211297B - A kind of compound clarifier in touch screen cover-plate glass production technology - Google Patents

Abstract

A compound clarifier used in the production process of touch screen cover glass, used to eliminate bubbles in molten glass, the key lies in: the clarifier formula components use NaCl as the main material, supplemented by _SnO and K2SO ₄ , wherein, the weight percent content of the above components is: NaCl: 74~93%, SnO: 2~8%, K ₂ SO ₄ : 5~18%. The composite clarifying agent not only meets the requirement of clarifying effect, but also ensures the advantages of light weight and easy chemical tempering of the touch screen cover plate glass.

Description

Composite clarifier used in touch screen cover glass production process

technical field

The invention belongs to the technical field of glass clarifiers, in particular to a composite clarifier used in the production process of touch screen cover glass.

Background technique

Air bubbles formed by contaminants in the glass melt are called "air seeds". The existence of air seeds has an impact on the refractive index, density and light transmittance of glass. The process of removing bulk inclusions from the melt is called fining or refining of glass. The chemical components introduced into the glass to achieve the clarification effect are called clarifiers. Traditional clarifiers are mostly arsenic oxides or acids, and the content usually accounts for 0.9-1.1% (weight percentage) of the glass. Arsenic has a good clarification effect, but due to the toxicity of arsenic, it brings a great economic burden to the production and treatment. Antimony is a substitute for arsenic that appeared later. Although it can achieve certain clarification purposes and reduce toxicity, it is still harmful and expensive, which is not conducive to environmental protection. Furthermore, for the touch screen cover glass, the addition of the clarifier should also consider its light weight and high strength requirements.

Contents of the invention

In order to solve the above technical problems, the present invention designs a composite clarifying agent used in the production process of touch screen cover glass. The composite clarifying agent not only meets the requirements of clarifying effect, but also ensures that the touch screen cover glass is light in weight and easy to be chemically tempered. Etc.

The technical solution adopted in the present invention is: a composite clarifying agent used in the production process of touch screen cover glass, which is used to eliminate bubbles in molten glass, the key lies in: the main ingredient of the clarifying agent formula is NaCl , supplemented by SnO and K ₂ SO ₄ , wherein the weight percent content of the above components is:

NaCl74~93%,

SnO2~8%,

K ₂ SO ₄ 5~18%.

The beneficial effects of the present invention are as follows: 1. The composite clarification method combining oxidation clarification, sulfur clarification and halogen clarification is adopted, and the synergistic effect and superimposed effect of the three are fully exerted, and the effect of continuous clarification can be achieved, and the clarification ability is greatly enhanced; 2. NaCl, as the main body of clarification, will release halide ions in the clarification stage of the touch screen cover glass manufacturing process, vaporize and volatilize, and promote the clarification of the glass liquid; 3. The clarifier introduces a certain amount of SnO for the purpose of assisting clarification. While clarifying and ensuring light weight and relatively low cost, the addition of SnO is designed to be 2% to 8%; 4. A certain amount of K ₂ SO ₄ is introduced for the purpose of assisting clarification, and an appropriate amount of K ⁺ is helpful for later tempering , in order to ensure clarification and late tempering effect while avoiding corrosion of refractory bricks, the addition of K ₂ SO ₄ is designed to be 5% to 18%; 5. The introduction of Na ⁺ and K ⁺ can not only meet the fluxing requirements, but also It helps to improve the tempering effect of the touch screen cover glass; 6. The introduction of the composite clarifier can make the density of the touch screen cover glass relatively lower, and obtain the advantage of light weight, which is suitable for the large size demand of the market.

detailed description

A compound clarifier used in the production process of touch screen cover glass, which is used to eliminate bubbles in molten glass, it is important that NaCl is used as the main material in the clarifier formula components, supplemented by _SnO and K2 SO ₄ , wherein the weight percent content of the above components is:

NaCl74~93%,

SnO2~8%,

K ₂ SO ₄ 5~18%.

The formulations of NaCl, SnO and K ₂ SO ₄ are powder.

The particle size range of the NaCl is 80-350 mesh.

The particle size range of the SnO is 100-400 mesh.

The particle size range of the K ₂ SO ₄ is 100-330 mesh.

In specific implementation, the composition of the touch screen cover glass used to verify the effect of this clarifying agent (not including the clarifying agent part) is:

SiO ₂ 65.7%,

Al ₂ O ₃ 14.5%,

B ₂ O ₃ 3%,

KO ₂ 2.8%,

NaO ₂ 10.7%,

CaO1.3%,

MgO2%.

The above percentages are percentages by mass.

Then add this new type of composite clarifier to the glass raw material formula composed of the above proportions, wherein the quality of this composite clarifier accounts for 2.5% to 15% of the overall mass. Proportion according to the table below:

Table 1

composition(%) Embodiment one Embodiment two Embodiment three Embodiment Four Embodiment five Embodiment six Embodiment seven main ingredient 93% 92% 91% 90% 85% 95% 97.5% clarifying agent 7% 8% 9% 10% 15% 5% 2.5%

Next, compound the clarifier according to the following ratio, see Table 2 for details:

Table 2

Verifying the effect of the composite clarifying agent of the present invention is accomplished through the following steps: weighing-mixing-melting-stirring clarification-homogenization-molding-annealing-processing-related tests.

See Tables 3-1 to 3-7 for the clarification effect data obtained by using the different ratios of ingredients (Examples 1 to 7) in Table 1.

Table 3-1

Numbering number 1 number 2 number 3 No 4 Number 5 number 6 Number 7 number 8 No.9 No. 10 number 11 Air seed concentration (a/kg) 7 8 7 9 8 8 9 8 8 8 8 Numbering 12th Number 13 No. 14 15th No. 16 number 17 No. 18 No. 19 number 20 The 21st number 22 Air seed concentration (a/kg) 9 7 6 7 7 6 7 5 6 5 9

Table 3-2

Numbering number 1 number 2 number 3 No 4 Number 5 number 6 Number 7 number 8 No.9 No. 10 number 11 Air seed concentration (a/kg) 7 7 8 9 9 8 8 9 8 7 7 Numbering 12th Number 13 No. 14 15th No. 16 number 17 No. 18 No. 19 number 20 The 21st number 22 Air seed concentration (a/kg) 8 7 7 6 6 6 5 5 6 5 5

Table 3-3

Numbering number 1 number 2 number 3 No 4 Number 5 number 6 Number 7 number 8 No.9 No. 10 number 11 Air seed concentration (a/kg) 7 7 7 9 8 8 7 8 7 7 8 Numbering 12th Number 13 No. 14 15th No. 16 number 17 No. 18 No. 19 number 20 The 21st number 22 Air seed concentration (a/kg) 6 7 7 6 6 5 6 5 4 4 6

Table 3-4

Numbering number 1 number 2 number 3 No 4 Number 5 number 6 Number 7 number 8 No.9 No. 10 number 11 Air seed concentration (a/kg) 8 7 8 9 8 7 7 8 7 6 6 Numbering 12th Number 13 No. 14 15th No. 16 number 17 No. 18 No. 19 number 20 The 21st number 22 Air seed concentration (a/kg) 6 6 5 5 6 5 4 5 4 4 5

Table 3-5

Numbering number 1 number 2 number 3 No 4 Number 5 number 6 Number 7 number 8 No.9 No. 10 number 11 Air seed concentration (a/kg) 6 7 5 6 8 7 7 5 7 6 6 Numbering 12th Number 13 No. 14 15th No. 16 number 17 No. 18 No. 19 number 20 The 21st number 22 Air seed concentration (a/kg) 6 4 5 6 7 5 4 5 4 4 5

Table 3-6

Numbering number 1 number 2 number 3 No 4 Number 5 number 6 Number 7 number 8 No.9 No. 10 number 11 Air seed concentration (a/kg) 7 7 8 7 8 7 6 8 6 6 5 Numbering 12th Number 13 No. 14 15th No. 16 number 17 No. 18 No. 19 number 20 The 21st number 22 Air seed concentration (a/kg) 5 6 4 5 6 5 4 5 5 4 5

Table 3-7

Numbering number 1 number 2 number 3 No 4 Number 5 number 6 Number 7 number 8 No.9 No. 10 number 11 Air seed concentration (a/kg) 8 8 8 9 8 7 7 8 7 6 83 --> Numbering 12th Number 13 No. 14 15th No. 16 number 17 No. 18 No. 19 number 20 The 21st number 22 Air seed concentration (a/kg) 7 6 5 5 6 5 8 5 6 7 8

It can be seen that the higher clarification requirement that the average seed concentration is less than 10/kg has been achieved by using the novel glass clarifier of the present invention.

In addition, chemical tempering experiments were carried out on the glass samples melted with No. 17 clarifying agent in Table 2 for the material recipe of Example 3 in Table 1 randomly selected, and the tempering results were recorded in Table 4.

Table 4

It can be seen from Table 4 that the surface stress of the glass obtained by chemical tempering for 8-10 hours reaches 520-540MPa, and the tempering depth reaches 50-65um.

Randomly select the No. 1 and No. 2 clarifying agent formulations in Table 2, and use Examples 1 to 4 in Table 1, respectively, and the four groups of materials to test the density of the obtained glass samples. The results are recorded in Table 5.

table 5

It can be seen from Table 5 that the density requirement of 2.320-2.400 is achieved by using the clarifying agent of the present invention, which effectively reduces the density of the touch screen cover glass and ensures the light weight of the touch screen cover glass.

Claims (5)

1. the compound clarifier in a touch screen cover-plate glass production technology, for eliminating the bubble in melten glass liquid, it is characterized in that: it is 5-15% that described clarifier accounts for the mass percent of frit formula, with NaCl for major ingredient in described clarifier recipe ingredient, be aided with SnO and K₂SO₄, wherein, the weight percent content of above component is:

NaCl74 ~ 93%,

SnO2 ~ 8%,

K₂SO₄5~18%。

2. the compound clarifier in a kind of touch screen cover-plate glass production technology according to claim 1, it is characterised in that: described NaCl, SnO, K₂SO₄Dosage form be Powdered.

3. the compound clarifier in a kind of touch screen cover-plate glass production technology according to claim 2, it is characterised in that: the particle size range of described NaCl is 80～350 orders.

4. the compound clarifier in a kind of touch screen cover-plate glass production technology according to claim 2, it is characterised in that: the particle size range of described SnO is 100～400 orders.

5. the compound clarifier in a kind of touch screen cover-plate glass production technology according to claim 2, it is characterised in that: described K₂SO₄Particle size range be 100～330 orders.