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Heat Insulation Strips knowledge - part 1

Time : 2022-07-06 Hits : 2

Heat Insulation Strips knowledge - part 1

At present, there are three kinds of Heat Insulation Strips for broken bridge aluminum alloy doors and windows. One uses PVC (polyvinyl chloride) as raw material, one uses Pu (polyurethane) as raw material, and the other uses PA (polyamide, commonly known as nylon) as raw material. PVC Heat Insulation Strips and PA Heat Insulation Strips are both extrusion process, and Pu rubber strip is glue injection process. This article will mainly introduce the relevant knowledge of PA Heat Insulation Strips.

Performance comparison between PA Heat Insulation Strips and PVC Heat Insulation Strips

1. The main raw material of PA Heat Insulation Strips is PA66 plus 25% glass fiber, and the main raw material of PVC Heat Insulation Strips is PVC resin powder plus 25% calcium carbonate. Compared with PVC Heat Insulation Strips, PA Heat Insulation Strips has the following advantages:

(1) High tensile strength

PA Heat Insulation Strips: > =126n/mm

PVC Heat Insulation Strips: about 70n/mm

(2) High thermal deformation temperature

PA Heat Insulation Strips: 240 ℃

PVC Heat Insulation Strips: 90 ℃

(3) Durable, PVC Heat Insulation Strips is easy to aging

(4) Good self extinguishing performance

2. How to distinguish between PA Heat Insulation Strips and PVC Heat Insulation Strips

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(1) The appearance of PA Heat Insulation Strips is not as smooth as that of PVC Heat Insulation Strips

(2) It only takes oneortwo times to break the PA Heat Insulation Strips by hand, while the PVC Heat Insulation Strips

Hot strip needs more than ten times

(3) There is a crisp sound when the PA Heat Insulation Strips is broken. After breaking, the fracture is not deformed and can be butted and restored; After the PVC Heat Insulation Strips is broken, the fracture is white and deformed, and it cannot be butted and restored.

(4) Equivalent specifications and models, such as i-14.8, PA Heat Insulation Strips weighs 45.1g, PVC Heat Insulation Strips weighs 57g

PA national standard for Heat Insulation Stripss

In August, 2008, the National Standardization Committee held a meeting to formulate the 'national standard for thermal Heat Insulation Stripss' in our company. Our company participated in the formulation of gb/t23615.1 "auxiliary materials for aluminum alloy building profiles Part 1: polyamide Heat Insulation Stripss" national standard.

1. Test spline requirements

The spline must be dried with a moisture content of less than 0.2% (weight percentage) or within one hour after being dried in a 140 ℃± 2 ℃ ordinary drying oven for 6 hours

Complete all tests within

2. Testing environment

Room temperature: 23 ℃ ± 2 ℃

3. Several main indicators

(1) Characteristic value

Characteristic value calculation formula:

Characteristic value = average value -2.02*s

variance

S=

2 [(average value - T1 2] / [(number of samples (n) - 1]

Transverse tensile strength T1 = maximum transverse tensile strength / sample length

Average value = ∑ t1/ number of samples n

(2) Transverse and longitudinal tensile strength

Transverse tensile strength > =70mpa=126n/mm/1.8mm longitudinal tensile strength > =80mpa=144n/mm/1.8mm

Note: as a structural member in the bridge cutoff aluminum alloy door and window system, the heat Heat Insulation Strips plays an important role in connecting two aluminum alloy profiles in terms of physical properties. Aluminum alloy doors and windows that use substandard heat Heat Insulation Stripss will break, resulting in a vicious accident of falling windows.

(3) Thermal deformation temperature

Thermal deformation temperature > =240 ℃

Note: the internationally accepted process of using Heat Insulation Stripss is to wear strips first and then spray. Because the oven temperature during spraying is 200 ℃, if the thermal deformation temperature does not meet the requirements, the surface of the Heat Insulation Strips will blister or deform, resulting in the scrap of the profile. If the oven temperature is too high during spraying, it will also cause the Heat Insulation Strips to indicate foaming or deformation.

(4) Impact strength

Impact strength (without notch) >=35kj/m2 or no fracture

Note: when the aluminum profile factory penetrates the heat Heat Insulation Strips into the profile, if the impact is not enough, the heat Heat Insulation Strips will crack, resulting in the scrap of the profile. For example, the pressure setting during threading in the profile factory is unreasonable (greater than 300N), which will also cause cracking of the Heat Insulation Strips.

(5) Stress cracking performance

After the stress cracking test (shaft nail) is completed, all samples shall be free of cracks.

Note: if the stress cracking performance is not up to standard, it will lead to the same consequences as (4).

(6) High and low temperature transverse tensile strength testing environment: high and low temperature box

High temperature: 90 ℃± 2 ℃

Low temperature: -30 ℃ ± 2 ℃

High temperature transverse tensile strength > =42mpa

Low temperature transverse tensile strength > =70mpa

Note: the high and low temperature experiment simulates the use of the Heat Insulation Strips in high and low temperature environments. If the standard is not met, the Heat Insulation Strips will break.

(7) Glass fiber content

Glass fiber content: 25% ± 2.5%

Note: the glass fiber increases about, if there is too little glass fiber, it will affect

Strength of Heat Insulation Strips; If the glass fiber exceeds the standard, the impact strength of the Heat Insulation Strips will be reduced and the stress cracking performance will be affected.

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CONTACT:Alex Lee