Insulating glass doors and windows with sealant

Insulating glass doors and windows with sealant
Abstract: In this paper, the structure of insulating glass is introduced, the types and properties of insulating glass for door and window, its physical properties and typical grading, and the quality control points and properties of insulating glass are expounded. In order to select the insulating glass sealant for doors and windows and its manufacturing method Provided the reference comments and recommendations to meet the requirements.
1 Overview
Insulating glass performance, including sealing performance and structural properties, to understand the structure of the insulating glass on the right choice of insulating glass sealant, as well as manufacturing methods and quality control is important to meet the requirements.
2. Insulating glass structure type
The hollow glass structure refers to a combination of sealant and spacer frames. Hollow glass structure is divided into a single seal and double seal two structures. Respectively, as shown in Figure 1, Figure 2 shows:
 
Figure 1 One-channel seal
Single-channel seal structure refers to the structure of the hollow glass, only playing a plastic, seal structure for the single-channel are: hot melt butyl rubber (Hot Melt Sealant), polysulfide rubber, polyurethane and Swiggle ). Double seal structure refers to the hollow glass structure to play two plastic, the first seal almost all use polyisobutylene (PIB), for the second seal of the glue are: polysulfide rubber, polyurethane or silicone adhesive. It is particularly emphasized here that the use of polyisobutylene (PIB) and silicone sealant must be used for the installation of insulating glass for structural applications such as insulating glass for curtain walls because of the extremely high adhesion and UV resistance required for the sealing system. (Note: This article discusses the doors and windows with insulating glass sealant instead of structural installation of hollow glass sealant)
 
Figure 2 Dual Seal
3. Insulating glass sealant type
Hollow glass sealant can be divided into two categories of thermoplastic and thermosetting. Thermoplastic insulating glass sealants are: hot melt butyl rubber (Hot Melt Sealant), Swiggle (real-dimensional high-gel) and polyisobutylene (PIB) and so on. Thermosetting insulating glass sealant are: polysulfide rubber, polyurethane and silicone rubber and so on.
4. Insulating glass sealant physical properties and typical classification
4.1 insulating glass sealant performance requirements Insulating glass sealant performance requirements include the following two aspects:
1) Adhesion to Substrate
---- Glass (including: white glass, LOW-E glass, etc.)
---- interval frame (such as: rolling or anodized aluminum frame, galvanized steel, glass fiber, etc.)
2) Weatherability Weatherability that the sealant in the work environment, water resistance, UV resistance, high temperature resistance and low temperature resistance.
4.2 The following important factors should be taken into consideration when selecting the insulating glass sealing system:
1) physical properties and / or water vapor permeability resistance
2) Convenience at the time of manufacture
3) Production efficiency
4) Costs
5) Installation considerations
4.3 All kinds of insulating glass sealant performance comparison
1) Water vapor transmission rate (MVTR)
Water vapor transmission rate that water vapor through the sealant ratio, it depends on the physical properties of glue and by the temperature and relative humidity, different polymer combinations have different water vapor resistance, the understanding of water vapor transmission rate on the hollow The effect of glass life is important. Hollow glass must first prevent the penetration of external water vapor inside the insulating glass, otherwise not only the performance will be greatly reduced, and the insulating glass will appear within the fog and other failures.
Table 1 various types of sealant water vapor transmission rate performance comparison

Sealing material against water vapor permeability
Hot Melt Sealant Excellent
Polyisobutylene (PIB) is excellent
Polysulfide glue good
Polyurethane good
Silicone glue poor
Swiggle is excellent
        Table 2 Typical Sealant Moisture Transmittance (MVTR)
Seal Material Typical Moisture Permeability (MVTR) (mg / m2 / day)
Hot Melt Sealant 0.65
Polyisobutylene (PIB) 0.17
Polysulfide 40-65
Polyurethane 15-40
Silicone adhesive ≥ 200
Swiggle 0.65
2) Gas holding capacity
Hollow glass filled with inert gases can further improve the performance of insulating glass, commonly used inert gases include: argon, SF6, krypton, xenon and so on. The gas-retaining capacity of the sealant is different.
Table 3 types of sealant gas retention capacity of the typical comparison
Sealing material gas holding capacity
Hot Melt Sealant Good - Excellent
Polyisobutylene (PIB) is excellent
Polysulfide glue good
Polyurethane general - good
Silicone glue poor
Swiggle Good - Excellent
Table 4 The relative value of gas retaining capacity of various types of sealant
The relative value of the argon holding capacity of the sealing material
Hot Melt Sealant 2
Polyisobutylene (PIB) 1
Polysulfide rubber 4
Polyurethane 45
Silicone adhesive
Swiggle 2
3) UV resistance: UV resistance refers to the sealant resistance due to ultraviolet radiation caused by the decline in the performance of materials. UV will decompose the polymer and affect its performance.
  Table 5 Comparison of various types of sealant UV resistance
Comparison of Ultraviolet Resistant Capability of Sealing Material
Hot melt butyl rubber (Hot Melt Sealant) good
Polyisobutylene (PIB) is excellent
Polysulfide glue good
Polyurethane good
Silicone rubber excellent
Swiggle is good
4) high temperature performance: high temperature environment, the sealant will be subject to varying degrees of softening and affect its performance.
Table 6 types of sealant high temperature performance comparison
Comparison of High Temperature Resistance of Sealing Material
Hot melt butyl rubber (Hot Melt Sealant) good
Polyisobutylene (PIB)
Polysulfide glue good
Polyurethane good
Silicone rubber excellent
Swiggle is good
5) low temperature performance: In low temperature environment, the sealant will be affected by the low temperature effect of its life.
Table 7 types of sealant low temperature performance comparison
Comparison of Low Temperature Resistance of Sealing Material
Hot melt butyl rubber (Hot Melt Sealant) in general
Polyisobutylene (PIB) good
Polysulfide glue good
Polyurethane good
Silicone rubber excellent
Swiggle (real high-dimensional strips) in general
6) Adhesive properties: The adhesive properties are a measure of the internal strength of the polymer combination. Adhesion performance with the substrate can be expressed by the shear strength, bonding strength test methods are many kinds of lap shear strength test is one of them.
Table 8 types of sealant adhesive performance comparison
Comparison of Adhesive Properties of Sealing Materials
Hot melt butyl rubber (Hot Melt Sealant) in general
Polyisobutylene (PIB)
Polysulfide glue outstanding
Polyurethane excellent
Silicone rubber excellent
Swiggle (real high-dimensional strips) in general
7) resistance to various types of solvents and plasticizer properties: the installation of insulating glass sometimes use a variety of solvents and plasticizers containing compounds or components, solvents and plasticizers will change the performance of certain sealants. Solvent resistance and plasticizer ability were tested by direct contact with these materials over a long period of time.
Table 9 types of sealant resistance to various types of solvents and plasticizer performance comparison
Sealing material resistance to various types of solvents and plasticizer performance comparison
Hot melt butyl rubber (Hot Melt Sealant) in general
Polyisobutylene (PIB) -
Polysulfide glue outstanding
Polyurethane excellent
Silicone rubber excellent
Swiggle (real high-dimensional strips) in general
4.4 Sealant coating method: Sealant coating method and the type of sealant, the commonly used method of glue are the following:
1) pump (hot melt or room temperature)
2) gray knife (hand-mixing and gray knife smear)
3) manual glue (sewn or rope-like)
4) Extruder (semi-automatic or automatic)
Table 10 types of sealant coating
Sealing material coating method
Hot melt sealant (Hot Melt Sealant) hot melt pump or extruder
Polyisobutylene (PIB) linear or extruder
Polysulfide pump pump or gray knife
Polyurethane pump or gray knife
Silicone rubber pump
Swiggle Manual, semi-automatic, automatic
5. Quality considerations:
Insulating glass production process to consider the following matters:
1) glass cleaning technology
2) spacer frame molding
3) the number of molecular sieves and freshness
4) The assembly of insulating glass
5) coating of sealant
6) Installation operation and assembly:
Hollow glass sealant in the fight to be done: Tu uniform continuous and does not allow gaps and intermittent. According to the manufacturer's recommendation to sealant construction: coating thickness to meet the requirements for the hot melt glue is required to control the working temperature for the two-component plastic requires strict control of the two components of the ratio. Sealant manufacturers have operating instructions.
The performance of the insulating glass depends on the quality of the parts, the quality of the work of the operator, installation and use of the environment.
6. Summary
Insulating glass has many manufacturing methods, the best manufacturing method depends on the specific requirements: quality, efficiency and cost. There are many factors affecting the performance of insulating glass, one of which is your choice of sealant.
Table 11 various types of insulating glass manufacturing process comparison
Project one - component hot - melt adhesive technology two - component adhesive technology comfortable tape process
High production efficiency (single-class annual production capacity of up to 80,000 square meters) lower high
Complexity of the process less, more simple processes and more complex the most simple
The amount of labor required less staff and more staff at least
No special requirements for production environment requirements High, low-temperature curing time longer No special requirements
Curing time 2-3 minutes 24 hours a few minutes
(Imported) 16 yuan / square meter (butyl rubber plus polysulfide rubber) (domestic) 21 yuan / square meter (domestic) 31 yuan / square meter (import) the cost of the sealant material 9 yuan /
Equipment maintenance
Simple, high reliability is more difficult to simple, high reliability
Simple and complex management simple
Meet the standards National standard GB11944 ASTME773 / E774 The most senior CBA level GB GB11944 GB GB11944
Applicable to doors and windows with insulating glass can be applied to doors and windows, the use of polyisobutylene (PIB) and silicone rubber double seal can be used when curtain wall for insulating glass doors and windows, especially for the special-shaped
It can be seen from Table 11 that each process has its own characteristics, depending on the quality, production efficiency and cost, and so on. Production of products to meet the requirements of both the use, but also cheap, in order to better product popularity, promotion, in order to achieve the work and improve the quality of life, energy conservation and environmental protection purposes.