Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing thick polyvinyl butyral (PVB) film by direct water cooling process

A polyvinyl butyral and film technology, which is applied in the field of plastic molding and processing, can solve the problems of shortened service life, low cooling efficiency, difficulty in producing film, etc., and achieves shortened service life, avoids aging and yellowing, and high production cost Effect

Active Publication Date: 2012-11-28
ZHEJIANG DECENT PLASTIC
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mixture of polyvinyl butyral and plasticizer in the molten state is prone to oxidation and chain scission when exposed to the air, which will cause the material to change color and yellow, reduce the mechanical properties and shorten the service life
[0004] At present, the production process of PVB film is that polyvinyl butyral and plasticizer are mixed by extruder, then shaped by die head, and then indirectly cooled and shaped by embossing roller and cooling roller. This process has the following disadvantages Advantages: First, because the film is exposed to the air for a long time at high temperature, the material is easy to age and turn yellow; second, due to indirect cooling, the cooling efficiency is not high, and it is difficult to produce a film with a thickness greater than 1mm; third, the embossing rod and cooling The equipment investment of the roller is relatively large, which increases the cost of production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing thick polyvinyl butyral (PVB) film by direct water cooling process
  • Method for preparing thick polyvinyl butyral (PVB) film by direct water cooling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be further described below with specific embodiment, see Figure 1-2 :

[0023] A kind of method utilizing water direct cooling to prepare thick polyvinyl butyral film, concrete steps are as follows:

[0024] (1) Mixing: Mix PVB resin powder with a residual hydroxyl content of 17-23% and diester plasticizers and additives evenly on a high-speed mixer. The speed of the high-speed mixer is 400-800rpm, and the mixing time is 8 -12min, calculated based on the dry weight of PVB resin powder in the mixture, containing 25-40% of plasticizer, and 10-5000PPM of additives.

[0025] (2) Extrusion and plasticization: Pour the mixture obtained in step (1) into the hopper 1, plasticize and extrude it in the extruder 2 with an exhaust section, pass through the melt filter 3 to remove impurities, and pass through the melt pump 4 Stable pressure, extruded from T-shaped die head 5, wherein, the screw speed is 20-50rpm, the metering pump speed is 20-40rpm, the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
yellowness indexaaaaaaaaaa
relative humidityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of plastic molding and processing, in particular to a method for preparing a thick polyvinyl butyral (PVB) film by a direct water cooling process. The method comprises the following specific steps: (1) mixing materials; (2) extruding and plasticizing; (3) shaping by the direct water cooling process; (4) removing surface water; (5) performing online thickness measurement; and (6) drying, splitting and winding. In the invention, the PVB film with the thickness of more than 1mm is produced by combining the direct water cooling process with a drying treatment method, which can greatly reduce the time that a fused mixture of the PVB and a plasticizer is exposed to air, realize rapid cooling, high cooling efficiency and even thickness, and avoid the defects such as material aging and yellowing, reduced mechanical properties, shortened service life, high production cost and the like.

Description

Technical field: [0001] The invention belongs to the technical field of plastic molding processing, and in particular relates to a method for preparing thick polyvinyl butyral film by direct cooling with water. Background technique: [0002] Direct water cooling is very common in the processing of plastic granulation, plates, and profiled materials, but it is rare to apply direct water cooling technology to sheets or plastic films. The only published patent is: CN101177040A Direct water cooling It is used for blown film to solve the problems of uneven thickness and insufficient cooling of the film embryo. [0003] Polyvinyl butyral (PVB) has very good transparency, mechanical strength, cold resistance, ultraviolet resistance, good adhesion to glass, and is the most widely used interlayer material in the field of laminated glass. The mixture of molten polyvinyl butyral and plasticizer is prone to oxidation and chain scission when exposed to the air, which will cause the mate...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/92B29C47/88B29K29/00B29L7/00B29C48/08B29C48/92
CPCB29C48/92B29C48/08B29C48/919B29C2948/92647B29C2948/92904
Inventor 陈庚林卫平汤君武朱立疆
Owner ZHEJIANG DECENT PLASTIC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com