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Method for assembling metal pipes with two-component polyurethane adhesive

A two-component polyurethane and metal pipe technology, applied in the direction of adhesives, bonding methods, rod connections, etc., can solve the problems of reducing productivity and achieve the effects of increasing productivity, simplifying the preparation process, and high toughness

Pending Publication Date: 2022-07-22
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, EP 2274 549 B1 discloses that 1C heat-curing epoxy resin systems require heating above 50°C for a period of time, which reduces productivity
Additionally, heat-cured epoxy systems tend to be brittle

Method used

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  • Method for assembling metal pipes with two-component polyurethane adhesive
  • Method for assembling metal pipes with two-component polyurethane adhesive
  • Method for assembling metal pipes with two-component polyurethane adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] Preparation of two-component polyurethane adhesives

[0128] Two-component polyurethane adhesives were synthesized from the components shown in Table 1, and the amounts of each component are also shown in Table 1. The compositions of Part A were first mixed together to form a milky white liquid, and the resulting liquid was then mixed with Part B in a static mixer to obtain an adhesive. The properties of Component A, Component B and the adhesive are shown in Tables 2 and 3 below.

[0129] Table 1

[0130] Component A Amount (wt%) Polyol A 10.55 Polyol B 17 Polyol C 13 calcium carbonate 50 Tripropylene glycol 1 Triethylenediamine 0.2 NingRui 100 / 3A 8.25 Component B Diphenylmethane 4,4'-diisocyanate to NCO index of 103

[0131] Table 2

[0132] Component A Component B Exterior Milky white liquid brown liquid Viscosity (20℃), mPa·s 30,000±5000 250±100 Density(25℃),g...

Embodiment 2

[0136] The two metal tubes were joined and sealed using the adhesive of Example 1 .

[0137] The two metal tubes were first rinsed with ethanol and air-dried for 10 minutes to allow complete evaporation of the solvent. The first tube is made of copper and the second tube is made of aluminum. One end of the first tube is inserted into one end of the second tube to form a tube assembly with an overlapping area between the two ends.

[0138] Once the adhesive of Example 1 was obtained in the static mixer, it was drained from the mixer and then applied to one side of the jig within 5 minutes of its operating time. The collapsible clamp is made of polypropylene and has an axisymmetric shuttle shape. Place the clamp with adhesive applied on one side concentric with the tube assembly. The clamp is then closed so that the adhesive in the clamp fills the gap in the overlapping area of ​​the tube assembly and coats the outer surface area of ​​the tube assembly in the overlapping area...

Embodiment 3

[0154] Performance Evaluation of Two-component Polyurethane Adhesives

[0155] 1. Two-component polyurethane adhesive shows high bond strength between metal sheets.

[0156] Two standard aluminum panels were sandblasted and cleaned with ethanol, and air-dried for 10 minutes to allow complete evaporation of the solvent. A two-component polyurethane (PU) adhesive was then applied to the overlapping surfaces between the two aluminum panels. The adhesive was then pressed to a thickness of 2 mm using glass beads as a caliber to control the thickness, and then cured for 3 days. Lap shear strength tests were performed according to Test Method: ISO 4587. The test was repeated 3 times.

[0157] As shown in Table 4 and figure 1 shown, an average lap shear strength of 14.6 MPa at substrate failure was achieved.

[0158] Table 4

[0159] Experiment number 1 2 3 average Lap shear strength / MPa 13.6 14.6 15.6 14.6 fracture mode Substrate damage Substrat...

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Abstract

The invention relates to a method for joining a first metal pipe to a second metal pipe, said pipes being joined together in an overlap region by using a two-component polyurethane adhesive covering the overlap region, the method comprising the following steps: (1) applying the two-component polyurethane adhesive on an inner surface of a clamp; (2) one end of the first metal tube is inserted into one end of the second metal tube to form a tube assembly with an overlapping area between the two ends, and the overlapping area of the tube assembly is placed into a clamp; (3) closing the clamp such that the overlapping region of the tube assembly is secured in the clamp and wherein the adhesive covers the overlapping region of the tube assembly; (4) curing the adhesive; and (5) optionally, removing the clamp from the pipe assembly.

Description

technical field [0001] The present invention relates to a method of assembling metal pipes, in particular for cooling systems, using a two-component polyurethane adhesive. Background technique [0002] During the manufacture of cooling systems such as refrigerators or air conditioners, metal coolant pipes for the cooling medium must be joined together. The standard process for joining metal coolant tubes is soldering with solder powder, such as copper brazing. However, the disadvantage of welding these tubes is that due to the different materials of the tubes, they are not easily joined, welding can thermally damage the tubes, and the weld must be protected from corrosion in a second step. Furthermore, thermomechanical and mechanical stresses are transmitted through the solder joints. In this regard, several methods have been developed for bonding metal coolant tubes. For example, EP 2274 549 B1 discloses a method for joining a first tube and a second tube, the tubes bein...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J5/00F16L1/00F16B13/10
CPCC09J2400/163C09J2475/00C09J5/00F16B11/006F16L13/103F16L13/106F16B7/00F16L13/116B32B1/08B32B7/12B32B15/012B32B2037/1253B32B2037/1269B32B2255/06B32B2255/26B32B2311/12B32B2311/24B32B2311/30B32B2597/00C09J175/08F16B11/008
Inventor 刘英豪S·柏克恩彭徐袁王立平顾元彦梁栋方圆
Owner BASF AG
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