Composition for brazing, tube for heat exchanger, and heat exchanger
A heat exchanger and brazing technology, used in the field of heat exchangers and heat exchanger tubes, can solve problems such as unbalanced, and achieve the effect of excellent brazing
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[0120] Next, the present invention will be described based on synthesis examples, examples, and comparative examples, but the present invention is not limited to the following examples. In addition, "parts" and "%" are based on mass unless otherwise specified.
Synthetic example 1
[0121] Synthesis example 1 (synthesis of methacrylic resin)
[0122] In the reaction device with stirring device, cooling tube, dropping funnel and nitrogen introduction pipe, after charging 600 parts of 3-methoxy-3-methyl-1-butanol, under nitrogen flow, the temperature in the system was adjusted to The temperature was raised to 80°C.
[0123] Next, drop a mixed solution of 100 parts of methyl methacrylate, 275 parts of isobutyl methacrylate, 25 parts of methacrylic acid and 4 parts of benzoyl peroxide into the system for about 3 hours, and then The polymerization was kept for 10 hours to obtain a methacrylic resin solution. The solid content concentration of the obtained methacrylic resin solution was 40 mass %, and the acid value at the time of drying was about 40 mgKOH / g.
Embodiment 1～12 and comparative example 1～13
[0125] According to the mixing ratio shown in Table 1 and Table 2, anti-settling agent was added to the methacrylic resin solution, and after stirring well, Zn powder, Si powder and Nocolok (registered trademark) Flux (K-Al-F system additives) were mixed. Flux, manufactured by Solvay Co., Ltd.), and further stirred and mixed. Then, 3-methoxy-3-methyl-1-butanol was added to prepare a brazing composition having a solid content concentration of 50%.
[0126] In addition, the aluminum plate was coated with the obtained composition for brazing so that the total amount of the coating film after drying was the value shown in Table 1 and Table 2, and an additional solder was placed in an inverted T shape on the coated part. The aluminum plate was heated at 600° C., and a brazing test was performed to obtain a joined body sample.
[0127] [Table 1]
[0128]
[0129] [Table 2]
[0130]
[0131] Additionally, the details of the abbreviations in the table are described below.
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