In order to increase the number of times a liquid silicone mold can be turned over, it is necessary to optimize multiple aspects such as material selection, production process, use and maintenance. The following are specific methods summarized in combination with search results:
Material selection and quality control
1. Choose the appropriate type and hardness of silicone
Soft rubber is suitable for small and complex pattern products, and hard rubber is required for large products to improve deformation resistance.
Platinum-catalyzed addition silicone is preferred, which has better tear resistance and aging resistance, and the number of mold turns can reach 800-1000 times (gypsum).
2. Avoid adding silicone oil
Excessive silicone oil will destroy the molecular structure of silicone, causing the mold to become brittle and tear resistance to decrease. It is recommended to adjust the curing agent ratio or choose a high-flow silicone substitute.
3. Curing agent ratio and quality
The amount of curing agent added needs to be adjusted according to the temperature (usually 1.5-3%), and the amount should be reduced when the temperature is high to avoid the mold being too hard and brittle.
Use high-quality silicone brands to avoid inferior recycled materials or adulterated products.
Proper production and use of silicone molds
1. Mix according to proportion: Mix silicone and curing agent strictly according to the proportion provided by the manufacturer to ensure uniform mixing. Uneven mixing will lead to uneven curing of the mold and affect the service life.
2. Vacuum defoaming: During the production process, the silicone is vacuum defoamed to eliminate bubbles and improve the density and durability of the mold.
3. Spraying release agent: Spray an appropriate amount of release agent before using the mold to facilitate demolding and reduce mold wear. Pay attention to choosing the right type of release agent to adapt to different mold turning materials.
4. Avoid high temperature and fire source: Silicone molds should avoid high temperature fire source and power supply to avoid accelerated aging. If baking is required, it should be done in an oven and the appropriate temperature should be controlled.
Strengthen the mold structure
1. Add reinforcing materials: When making large or complex molds, reinforcing materials such as fiber cloth and glass fiber cloth can be added to the silicone to improve the tear resistance and service life of the mold.2. Reasonable design of mold structure: optimize the structural design of the mold, such as adding reinforcing ribs, changing the mold wall thickness, etc., to improve the overall strength and stability of the mold.
Correct maintenance and care
1. Regular cleaning: Clean the residue on the mold surface in time after use to avoid corrosion and damage. Avoid using corrosive reagents and hard tools when cleaning.
2. Proper storage: Store the mold in a dry, dust-free environment to avoid direct sunlight and heavy objects. Molds that are not used for a long time should be inspected and maintained regularly.
3. Rotational use: If multiple molds are available, it is recommended to rotate them to disperse wear and avoid damage caused by excessive use of a single mold.
Other precautions
1. Understand the material properties: Fully understand the properties of the mold material before making it, so as to choose the appropriate silicone type and ratio.
2. Control the curing time: For mold materials that need to be cured, the curing time should be strictly controlled to avoid aging of the silicone mold due to long-term heat.
3. Follow the operating specifications: Strictly follow the operating specifications to perform mold remodeling operations to avoid mold damage caused by improper operation.
In summary, by selecting appropriate silicone materials, correctly making and using silicone molds, strengthening mold structures, correctly maintaining and maintaining, and following operating specifications, the number of mold remodeling and service life of liquid silicone molds can be effectively increased.
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