Process for the production of a solar module

Abstract

The invention is to facilitate the attachment of an installation system in the production of a solar module. This is achieved via a process which comprises the following steps: a) mutual superposition of the layers that the structure of the solar module requires, where at least one heat-activatable double-sided adhesive tape is placed on the external side of the reverse-side layer and at least one retention plate is placed on said adhesive tape; b) mutual lamination of the layers mutually superposed in step a), at least with exposure to heat.

Claims

1. A process for the production of a solar module, comprising the following steps: a) mutual superposition of the layers that the structure of the solar module requires, and placing at least one heat-activatable double-sided adhesive tape on an external side of a reverse-side layer and placing at least one retention plate on said adhesive tape; and b) mutual laminating of the layers mutually superposed in step a), at least with exposing to heat, wherein the heat-activatable adhesive tape comprises an adhesive mass which comprises (i) at least one nitrile rubber present at 30 to 80% by weight, and (ii) at least one phenolic resin present at 15 to 70% by weight.

2. The process according to claim 1, wherein the reverse-side layer is a glass layer.

3. The process according to claim 1, wherein the solar module is a glass-glass system.

Description

EXAMPLES

(1) Test samples were produced via adhesive bonding of aluminium plates to glass sheets by means of a heat-activatable adhesive tape. The following materials were used here: Glass sheets: single-sheet safety glass, 19.537 cm, with a thickness 3 mm and, respectively, 2.510 cm with a thickness 6 mm Aluminium plates: aluminium strips, 7.52.5 cm, with a thickness 3 mm Adhesive tape: Tesa HAF 8402; Tesa HAF 8400

(2) The adhesive tapes here were used in single-ply form (one adhesive tape) or in double-ply form (two adhesive tapes mutually superposed).

(3) Test samples were produced with an adhesive bonding area of in each case 2.52.5 cm via mutual superposition of the glass sheet, of the adhesive tape(s) and of the aluminium plate, followed by mutual lamination at 150 C. and 1 bar for 90 s. These lamination parameters correspond to conventional conditions for the production of solar modules.

(4) The samples were then conditioned in accordance with the EN 61215:2005 humidity-freeze test known in the solar industry. In the humidity-freeze test the test samples are first heated from room temperature to 85 C. and held at this temperature at 85% relative humidity for 20 h. They are then cooled to 40 C. (once room temperature has been reached without regulation of humidity), and each test sample is kept at this temperature for at least 30 min. It is then heated again up to 85 C. (once room temperature is reached again at 85% relative humidity), and the cycle is repeated. The maximum time permitted to expire from the beginning of the cooling process until the temperature of 85 C. is again reached is 4 h. The total number of cycles provided in the test is ten.

(5) In order to study adhesive bond strength, the samples were subjected, after the conditioning process, to a dynamic shear test in a Zwick tensile tester. Here, the test specimens were subjected to tensile strain with a velocity of 10 mm/min in the y-direction, and the maximum force measured during this process was stated as result. Table 1 shows the test results.

(6) TABLE-US-00001 TABLE 1 Test results Thickness Strength Nature No. of glass Adhesive tape (N/cm.sup.2) of break 1 3 mm tesa HAF 8400 single-ply 1114 glass break 2 3 mm tesa HAF 8400 double-ply 1170 aluminium break 3 6 mm tesa HAF 8402 single-ply 1118 glass break 4 6 mm tesa HAF 8400 single-ply 994 glass break 5 6 mm tesa HAF 8400 double-ply 861 glass break

(7) As shown by the test results, heat-activatable adhesive tapes achieve excellent shear strengths in adhesive bonds of the materials usually used for solar modules, under conditions that are usual in solar module production. The process-technology advantages of the claimed method are thus available for the intended use.