CN209797835U - Optical PVB intermediate film - Google Patents

Abstract

The utility model belongs to the technical field of PVB intermediate coat technique and specifically relates to optics PVB intermediate coat. The optical PVB intermediate film shaft comprises an antifogging layer, a shading layer, a stretch-proofing layer and an adhesion layer, wherein the antifogging layer, the shading layer, the stretch-proofing layer and the adhesion layer are sequentially arranged, the antifogging layer is formed by mixing and stirring a plasticizer containing antifogging particle powder and PVB resin powder, the shading layer is formed by mixing and stirring shading particle powder and PVB resin powder, the stretch-resistant layer contains stretch-resistant particle powder and PVB resin powder, the adhesive layer is an adhesive layer, the antifogging particle powder is water-absorbing carbonized particles with different particle sizes, the surfaces of the water-absorbing carbonized particles are provided with a plurality of concave-convex marks, a plurality of wavy connecting grains are arranged between the antifogging layer and the shading layer, a plurality of zigzag lines are arranged between the shading layer and the stretch-resistant layer, and the antifogging layer, the shading layer and the stretch-resistant layer are all extruded by a double-screw extruder.

Description

Optical PVB intermediate film

Technical Field

The utility model belongs to the technical field of PVB intermediate coat technique and specifically relates to optics PVB intermediate coat.

Background

The PVB laminated glass intermediate film (PVB intermediate film for short) is a high molecular material formed by mixing, extruding, plasticizing and tape-casting polyvinyl butyral (PVB) resin and triethylene glycol diisocaprylate (3GO) or di-n-hexyl adipate (DHA) serving as a plasticizer, is a soft sheet, and is widely applied to the field of laminated glass of high-rise buildings, automobiles, aviation, navigation and the like. The PVB laminated glass has multiple functions of safety, heat preservation, noise control, ultraviolet isolation and the like.

Polyvinyl butyral (PVB) is a polymeric material that can be used in safety glass interlayers and has properties such as high flexibility, high transparency, high adhesion, impact resistance, and penetration resistance. The adhesive has good adhesive property to glass, metal, wood, ceramic, leather, fiber and other materials, and after the adhesive is used for safety glass, the glass can not be broken and generate fragments to hurt people after being impacted by the outside.

The haze is used as an important index for evaluating the quality of the PVB intermediate film, has an important influence on the appearance of the PVB laminated glass, and particularly when the PVB laminated glass is used for automobile safety glass, the excessive haze can influence the vision definition of a driver, so that the driving safety is influenced, and the phenomenon is particularly obvious under the strong light irradiation.

The project aims to develop an optical PVB intermediate film for automobile glass, and the haze of the PVB intermediate film is controlled to be a lower level. The automobile safety protection device can not only guarantee the driving safety of the automobile, but also obviously promote the riding comfort of drivers and passengers. In addition, the product grade and the product competitiveness can be improved accordingly.

PVB was originally invented in 1935 by american scientists. U.S. government legislation in 1938 required the use of PVB as a substrate for automotive front windshields. The PVB film production technology has long been monopolized by famous PVB production companies such as Youno, accumulated water in Japan, and Coly in Germany.

The first PVB processing production line was introduced by Jiahua plastics, Qinhuang island, 1993. With the development of recent 10 years, after 2003, PVB intermediate films came to the first burst period. During this period, a number of PVB intermediate film manufacturers are in operation. Due to the technical level and the limitation of raw materials, the competitive PVB intermediate film manufacturers in China mainly include zhejiang detitai plastics, kyowa special resin, and huzhou xin new-rich materials.

with the development of economic society, the requirements of people on safety and comfort in driving automobiles are higher and higher. The automobile front windshield is used as a main channel for an automobile driver to know road conditions and detect dangers, and the quality of the optical performance of the automobile front windshield has obvious influence on the driving safety and the comfort of the driver. Haze is one of the important factors for the optical properties of automotive glass. The automobile glass with excessive haze can seriously affect the sight of a driver, and particularly when strong light is irradiated from the front or obliquely above, the influence is more obvious, so that the probability of traffic accidents is greatly improved. The haze of the automobile glass is strictly controlled, so that the driving safety of the automobile can be guaranteed, and the riding comfort of a driver and passengers can be obviously promoted.

Typically, the haze of automotive glass is determined primarily by the haze of the PVB interlayer film therebetween. However, at present, no special requirement is made on the haze of the PVB intermediate film for the automobile laminated glass in the national standard, but the haze of the PVB intermediate film with the thickness of 0.76mm is required to be less than or equal to 0.7 percent according to GB/T32020-2015 and the building laminated glass. At present, film haze of less than or equal to 0.6 percent can be achieved by well-known PVB intermediate film manufacturers at home and abroad with a certain scale. Therefore, in order to further guarantee the driving safety and comfort of automobile drivers, improve the market competitiveness and high-end market orientation of the PVB intermediate film, and the production of the PVB intermediate film with more optical property becomes an obvious development trend.

SUMMERY OF THE UTILITY MODEL

the utility model aims at providing an optical PVB intermediate coat for automobile glass.

The optical PVB intermediate film comprises an antifogging layer, a shading layer, a stretch-proofing layer and an adhesion layer, wherein the antifogging layer, the shading layer, the stretch-proofing layer and the adhesion layer are sequentially arranged, the antifogging layer is formed by mixing and stirring a plasticizer containing antifogging particle powder and PVB resin powder, the shading layer is formed by mixing and stirring shading particle powder and PVB resin powder, the stretch-resistant layer contains stretch-resistant particle powder and PVB resin powder, the adhesive layer is an adhesive layer, the antifogging particle powder is water-absorbing carbonized particles with different particle sizes, the surfaces of the water-absorbing carbonized particles are provided with a plurality of concave-convex marks, a plurality of wavy connecting grains are arranged between the antifogging layer and the shading layer, a plurality of zigzag lines are arranged between the shading layer and the stretch-resistant layer, and the antifogging layer, the shading layer and the stretch-resistant layer are all extruded by a double-screw extruder.

Preferably, the PVB resin powder is formed by uniformly mixing and stirring polyvinyl alcohol particle powder and n-butyl aldehyde particle powder.

The utility model discloses the beneficial effect who brings is:

The utility model discloses develop the PVB intermediate coat that has optical characteristic and can produce and have optics car laminated glass, the glass of optics has penetrating bright visual effect, and this not only can give comfortable beautiful sensation in the impression, also can guarantee in the security of driving.

At present, no special requirement is made on the haze of the PVB intermediate film for the automobile laminated glass in the national standard, and the haze of the PVB intermediate film with the thickness of 0.76mm is required to be less than or equal to 0.7 percent as in the building laminated glass. The PVB intermediate film for the automobile glass with the haze lower than 0.3% is developed, so that the safety and the comfort of the automobile glass can be improved, the market can be standardized, the product quality can be improved, and the competitiveness of the China PVB industry in the international market can be improved.

The technical application and industrialization prospect are as follows:

As a new technology of independent improvement, the project puts forward higher requirements on the safety and the comfort of the automobile laminated glass, so that the domestic PVB glass intermediate film in China occupies a place in the middle-high-end market, and the healthy and rapid development of the whole PVB related industry is promoted.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 is a cross-sectional view of an optical PVB interlayer provided in a preferred embodiment of the present invention.

The corresponding reference numbers for the component names in the figures are as follows:

1. An antifogging layer; 2. a light-shielding layer; 3. a stretch resistant layer; 4. an adhesion layer; 5. antifogging particle powder; 6. PVB resin powder; 7. a light-screening particle powder; 8. stretch-resistant particle powder; 9. wave-shaped connecting lines; 10. zigzag lines.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and embodiments:

As an embodiment of the optical PVB intermediate film of the present invention, as shown in fig. 1, the optical PVB intermediate film comprises an antifogging layer 1, a light shielding layer 2, an anti-stretching layer 3 and an adhesion layer 4, wherein the antifogging layer 1, the light shielding layer 2, the anti-stretching layer 3 and the adhesion layer 4 are sequentially arranged, the antifogging layer 1 is formed by mixing and stirring a plasticizer containing antifogging particle powder 5 and PVB resin powder 6, the light shielding layer 2 is formed by mixing and stirring light shielding particle powder 7 and PVB resin powder 6, the anti-stretching layer 3 contains anti-stretching particle powder 8 and PVB resin powder 6 inside, the adhesion layer 4 is an adhesive layer, the antifogging particle powder 5 is water-absorbing carbonized particles with different particle sizes, the surface of the water-absorbing carbonized particles has a plurality of concave-convex marks, the antifogging layer 1 and the light shielding layer 2 are provided with a plurality of wave-shaped connecting lines 9, the light shielding layer 2 and the anti-stretching layer 3 are provided with a plurality of zigzag lines, the antifogging layer 1, the shading layer 2 and the stretch-proof layer 3 are all manufactured by extruding through a double-screw extruder.

In this embodiment, the PVB resin powder 6 is formed by uniformly mixing and stirring polyvinyl alcohol particle powder and n-butyl aldehyde particle powder.

The main technical indicators and parameters in the above embodiments:

Optical PVB interlayer for automotive glass: the haze is less than 0.3%, the light transmittance is more than or equal to 85%, the moisture content is less than or equal to 0.5%, the tensile strength is more than or equal to 22Mpa, and the others meet GB/T32020-2015.

The main technical route in the above embodiment

(1) The PVB resin in the project mainly refers to PVB resin powder and cut leftover materials, and the auxiliary agents are antioxidants, ultraviolet absorbers and the like. In order to ensure the uniformity of the mixing of the auxiliary agent and the PVB resin, the powdery auxiliary agent is specially mixed with the PVB resin powder. The plasticizer used in the project is mixed to prepare the plasticizer mixed solution with proper physical properties. The feeding mode of this project is solid, liquid material different passageways add to prevent the material feeding difficulty that the material mutual adhesion leads to.

(2) The project adopts a double-screw extruder to complete the mixing and plasticizing process of the resin powder and the plasticizer in the screw. The method adopts a screw combination with weak shearing, and a plasticizer injection section and a devolatilization section are designed in the screw, wherein the length-diameter ratio is 36: 1. and (3) metering the uniformly mixed solid material into a feeding port through a weightlessness scale, and injecting the uniformly mixed liquid material into a screw rod through a plunger pump. The two materials are mixed and plasticized in the screw and devolatilized at the exhaust port. The screw rotation speed is 80-150 rpm, the temperature of the feeding section is 80-100 ℃, the temperature of the plasticizing section is 140-160 ℃, and the temperature of the homogenizing section is 150-165 ℃.

(3) Melt filtration: the melt from the machine head contains impurities, coke materials and materials which cannot be plasticized, the quality of the product is influenced finally, and the impurities are removed by a 400-mesh melt filter to ensure the quality of the finished product.

(4) Melt pump: the PVB sheet requires extremely high to the thickness homogeneity, in order to guarantee the stability of mould pressure, this project adopts the melt pump to carry out steady voltage and pressure boost. And the nose drag can be reduced well. The temperature of the melt pump is 150 ℃ and 170 ℃, and the rotating speed is controlled below 35 rpm. In order to ensure the pressure of the die, a pressure sensor and the rotating speed of a main machine are arranged in front of the melt pump for closed-loop control. The pressure before the pump is 2-5 Mpa, and the pressure after the pump is 10-18 Mpa.

(5) A T-shaped die: the die is internally provided with a pressure distribution regulating block to ensure the consistent discharging speed of the die orifice. The temperature of the die is 150 ℃ and 170 ℃, and the lower middle part and the two sides are slightly higher. The temperature of the die lip is controlled between 80 ℃ and 100 ℃ by an oil temperature machine.

(6) Cooling and shaping: two cooling rollers with the diameter of 450mm are adopted to cool two surfaces of the diaphragm, the temperature of cooling water is controlled to be below 30 ℃, and the temperature of the diaphragm after passing through the two cooling rollers is below 40 ℃ so as to ensure that the diaphragm has enough strength to be pulled in the subsequent process.

(7) thickness detection and control: the film from the cooling and sizing roller is scanned in the longitudinal and transverse directions by an on-line thickness measuring system. And carrying out fine adjustment on the traction speed, the mold bolt and the mold temperature by an operator according to the scanning result. So as to produce the product with the uniformity meeting the requirement. The control requirement of this project is 0.76 + -0.02 mm.

(8) Slitting and coiling: and cutting the products meeting the requirements according to the order of a customer, and rolling the products together with the PE film under zero tension. And (5) carrying out vacuum packaging to obtain a finished product. This process requires control of ambient temperature and humidity.

Claims (2)

1. Optical PVB intermediate coat, its characterized in that includes antifog layer, light shield layer, stretch-proofing layer and adhesion layer, antifog layer, light shield layer, stretch-proofing layer and adhesion layer are arranged in proper order, antifog layer is formed by the plasticizer that contains antifog particle powder and the mixed stirring of PVB resin powder, the light shield layer is formed by the mixed stirring of shading particle powder and PVB resin powder, stretch-proofing in situ portion contains stretch-proofing particle powder and PVB resin powder, the adhesion layer is the adhesive layer, antifog particle powder is the hydroscopicity carbide particle that the particle size is inconsistent, hydroscopicity carbide particle surface has a plurality of concave-convex marks, antifog layer with be equipped with a plurality of wave between the light shield layer and connect the line, the light shield layer with be equipped with a plurality of zigzag line between the stretch-proofing layer.

2. the optical PVB interlayer of claim 1, wherein the antifogging layer, opacifying layer, and tensile layer are all formed by extrusion from a twin screw extruder.