Preface:

The coating of butyl sealant is the first and key step in the production of insulating glass, which determines the comprehensive performance of insulating glass products. In order to improve the appearance and quality of insulating glass, the butyl sealant used has the following technical requirements:

a. Must choose appropriate, high-quality butyl sealant;

b. Good initial viscosity and adhesion with glass;

c. Good sealing performance;

d. The coating shall be uniform, and the coating section shall be consistent;

e. Good compatibility with the sealant used together.

Theoretical research and practical problems are discussed and analyzed:

Mastering and implementing the correct production process is the first step and premise of insulating glass quality. The following talks about the problems and solutions or suggestions that are easy to appear in the use of J-based sealant:

a. Phenomenon: The butyl adhesive strip coated on the aluminum spacer strip has rough edges and is not neat.

Reason: There may be impurities at the outlet of the two rubber mouth or the rubber mouth is not smooth.

Solution or suggestion: Check whether there are impurities at the outlet of the two rubber mouth or whether the rubber mouth is smooth.

b. Phenomenon: The butyl adhesive strip and the second sealant appear - - strip gap (white line).

Reason: the second sealant is not applied in the correct way.

Solution or suggestion: When applying the = channel sealant, it should be applied with appropriate force and in the direction of - -, so as to enter the air defense air bag into the sealant and reduce the sealing performance of the insulating glass.

c. Phenomenon: extrusion is not smooth after heating, easy to break glue (broken wire)

Reason: The key to the use of butyl sealant is extrusion, temperature control is very important in the extrusion process, temperature control is

Whether suitable, directly affect the rheological state of butyl sealant in the whole process, affecting the internal quality and beauty of the product, should pay special attention to the temperature. The temperature is too high will cause the sealant to melt too large, no strength or even can not be formed; The temperature is too low, the fluidity of the glue is poor, the machine extrusion glue is not smooth, affecting the construction progress, which is the main reason for the extrusion is not smooth. Another reason may be that butyl sealant is included in the manufacture of bubbles, resulting in the disconnection phenomenon in the extrusion process.

Solution or suggestion: temperature selection Generally speaking, extrusion temperature range provided by the manufacturer is appropriate. Extruder temperature, generally set the barrel between 100-150°C, the head between 102-152*C. In order to make the host to produce a constant pressure, so that melting uniform extrusion, so the head temperature is higher than the temperature of the machine. Temperature has a certain lag, attention should be paid to the adjustment, heating and cooling should be gradually carried out, before coating, should be appropriate exhaust, in order to reduce the internal bubbles and gaps, the house extrusion bubbles caused by broken glue.

d. Phenomenon: extrusion temperature control is suitable, but the bonding property of aluminum spacer and J-base seal is not good or poor.

Reasons:

(1) Aluminum spacer or conveyor belt is not clean with oil or dust.

(2) the belt is transmitted too fast, and the aluminum spacer is not coated with glue.

(3) Aluminum spacer frame skew, the mouth is not easy to pass or the glue position is incorrect.

(4) the initial viscosity of the sealant itself is poor.

Solution or suggestion:

(1) Clean and proofread the aluminum spacer and transmission belt, and adjust the speed of the transmission belt.

(2) proportionally adjust the gap between the two rubber nozzle.

(3) When coating, the aluminum spacer frame should be placed vertically to prevent the non-adhesive phenomenon caused by the glue nozzle is not easy to pass or the incorrect glue position.

(4) butyl sealant is both elastic and viscous elastomer, through the appropriate temperature and pressure extrusion adsorption on the clean aluminum spacer, melt paste butyl rubber to the surface of the adhesive diffusion. Gradually wetting the surface of the adhesive well deep into the surface pores, this is a physical process, in this process and the adhesive (aluminum spacer) is only the line contact between the surface, only after pressing the surface contact between the adhesive and the adhesive. Therefore, suitable construction pressure and temperature are conducive to this process. It is worth noting that the adsorption of the glue on the aluminum spacer strip takes a period of time (3-5min) to reach. Good bonding effect.

e. Phenomenon: The production of good insulating glass, butyl sealant flow (tears).

Reasons:

(1) The butyl sealant used for insulating glass is incompatible with the outer insulating glass sealant;

(2) the sealant used in the hollow glass frame does not blend with butyl sealant;

(3) The weatherproof sealant used in curtain wall installation is incompatible with butyl sealant;

(4) Use unqualified butyl sealant.

Solutions or suggestions: (1) choose ** brand sealant, as far as possible supporting the use of the same company's products; Different manufacturers of sealant before the use of the necessary compatibility test (the compatibility test for butyl sealant. Compatibility test between the outer insulating glass sealant, the sealant used in the frame or the weatherproof sealant used in the curtain wall installation).

Matters needing attention

a. Open the original package and check for obvious particles and sundries.

b. Apply slowly, not too fast, in case the application is not complete.

c. Except that the compress does not reach the end or the press wheel is lifted, the time of the press wheel can be adjusted again if the time of pressing is too short.

d. In addition to the applied aluminum spacer frame is not easy to be placed for too long, otherwise the effect of bonding and sealing will be affected.

e. If the transmission belt deviates, it should be corrected in time. If the transmission belt has too much adhesive, it should be removed in time.

f. Apply.. The sealant should be pressed in a short time to avoid the impact of environmental temperature on product adhesion. After rolling, the insulating glass that has not been coated with a second sealant should be placed horizontally. In a short time, it can be placed vertically, but it can not collide to avoid unnecessary dislocation.

d. Before making double channel insulating glass, necessary compatibility test must be carried out on the double channel sealant to prevent the two kinds of sealant from being dissolved.