What Are The Sudden Problems with Sealants?（1）

1. What should I do if there are a lot of bubbles when gluing?

In general, the causes and solutions for bubbles are as follows:

(1)Bubbles generated during sealant injection.

solution: smooth sealant seams and even sealant injection.

(2) The proportion of component B is too high, the reaction is too fast, and the bubbles cannot be completely discharged.

   Solution: Reasonably adjust the relative proportions of components A and B.

(3) There are bubbles in the sealant itself.

solution: replace with good quality sealant.

(4)During the construction of weather-resistant sealant, the foam rod is damaged and deflated.

solution: fill the foam rod without damage as much as possible, with the damaged side facing inward.

(5)The sealant joints are wet.

Solution: Make sure the sealant joints are dry during construction.

2. What are the requirements for the performance of sealants in bathrooms?

Bathrooms are mostly cool and humid environments where bacteria can easily breed, so there are high requirements for the mildew-proof performance of the sealant and low elasticity requirements. The joints of the shower door, toilet, bathtub, and wash basin in the bathroom should be sealed with anti-mold sealant. Silicone anti-mold sealant is mainly used, and it is relatively soft after curing.

3. The door and window sealant cracks and pulverizes

In engineering projects, cracking and powdering of door and window adhesives are serious quality problems, which will lead to failure of door and window adhesive seals, resulting in water and air leaks.

Under normal circumstances, the causes and solutions for cracking and powdering are as follows:

(1) If the depth of injection of door and window sealant is not enough, the sealant will be too thin or too thin in parts. The cured sealant joint will not be able to withstand the displacement and deformation caused by external force, and cracking may occur.

Solution: Since the joint sizes of different doors and windows are different, the door and window adhesive injection size should adapt to the door and window joint size to ensure that the door and window sealant and the edge base material have sufficient bonding area and bonding thickness.

(2) Inferior door and window adhesives are used. In order to reduce costs, some door and window adhesive manufacturers have significantly reduced the content of silicone base polymers, filled them with a large amount of cheap mineral oil and powder fillers, and produced oil-filled door and window adhesives. There will be no obvious problems when this type of door and window sealant is first used. However, because the mineral oil filled in the sealant is an alkane substance and has poor compatibility with silicone sealant, the mineral oil will migrate out of the sealant after a period of time; and Its silicone content is low and its aging resistance is poor. After being used for a period of time, the sealant will obviously harden, shrink, and even crack and pulverize.

Solution: Currently, the quality of door and window adhesive products on the market is uneven, and a considerable part of the door and window adhesive products in circulation are filled with mineral oil. In order to avoid the above situation, you should choose brand products with guaranteed quality and not filled with mineral oil. When selecting products, you should refer to the national standard GB/T 31851-2015 "Detection Method for Alkane Plasticizers in Silicone Structural Sealants" issued by the National Standardization Committee in 2015. Door and window adhesives can refer to this standard method to determine whether they contain alkanes ( mineral oil). Another simple method is to put the door and window sealant on a flat plastic film and observe it after curing for a few hours. If the plastic film shrinks and wrinkles, it indicates that the door and window sealant is likely to contain mineral oil. The more serious the shrinkage and wrinkles, the more minerals it contains. The more oil there is.