From the appearance level, light color door and window sealant is worthy of the beauty of the crown, can make the house look beautiful, clean, is most people like to choose light color sealant as one of the important choices for home decoration sealing. However, after a period of use of light color doors and Windows sealant inadvertently, there are dark spots, yellow and other phenomena, the appearance is extremely ugly, seriously affect the visual beauty.

In fact, not only the sealant in home decoration will change color, but also the sealant in the external wall and curtain wall. As the saying goes, architecture is a living work of art, and the discoloration of doors and Windows sealant undoubtedly leads to a decline in the level of architectural appearance. In order to protect the appearance of the building level, ** Xiaobian for you to answer, why does the sealant change color?

Reason analysis of door and window sealant discoloration

01 The door and window sealant is in contact with some accessory materials such as rubber strips or rubber pads

Many auxiliaries will be added in the process of rubber material processing. With the passage of time, some auxiliaries will spread to the surface of sealant, and yellow phenomenon will occur. The probability of light-colored sealant is greater.

02 Door and window sealant is affected by environmental factors

Acid and alkaline substances:

Some acid cleaning agents (such as oxalic acid solution), alkaline materials (such as cement mud) and other corrosive substances lead to discoloration of silicone glue;

The influence between different sealants:

I do not know that you have not understood, acid sealant, neutral alcohol sealant, neutral idol sealant three can not be used together, they will affect each other and change color, acid glass glue will cause oxime glass glue yellow, neutral oxime type and neutral alcohol type glass glue used together will become yellow.

Neutral oxime type glue when the release of oxime molecules: -C=N-OH encounter acid into amino, amino is easy to be oxidized by oxygen in the air into colored substances!

These two reasons are the improper use of sealant, contact with incompatible materials caused by, and sealant quality has no direct relationship.

03 The color material added to the door and window sealant is not good enough in weather resistance

The sealant will fade slowly under the influence of conventional environment. If the fading is faster, the weatherability of the color material is poor.

04 Doors and Windows sealant ** design defects, low quality of raw materials, quality fluctuations lead to discoloration

As can be seen from the above table:

** sealant features: selection of raw materials, high liquid content (40~50%), good elasticity, good aging resistance, 5~10 years of use still has good elasticity.

Characteristics of inferior sealant: high filling powder (70~80%), liquid material using recycled materials, poor elasticity, easy aging discoloration, cracking, debonding.

In addition, many manufacturers fill a large number of white oil in **, white oil volatile sealant has a large shrinkage, often cause discoloration and accompanied by glue crack.

How to avoid silicon door and window sealant discoloration

After saying the above about the characteristics and reasons for the discoloration of silicone sealant, I hope to attract everyone's attention. When using sizing, we should avoid it specifically. We suggest that users refer to the following 4 points:

1, before construction, the material in contact with sealant to do compatibility test, compatibility between materials; Or choose more compatible accessories, such as silicone rubber products instead of rubber products, reduce the probability of yellowing;

2, avoid sealant contact or exposure to acid, alkali and other corrosive environment;

3, discoloration mainly occurs in light, white, transparent and other products, the choice of dark or black sealant can reduce the risk of discoloration.

4. Choose high-quality door and window sealant.

The above information is provided by door and window sealant manufacturers. Welcome to telephone consultation!