How to remove the layering line in resin layer casting?
To be honest, it is difficult to completely remove layering lines. Because polyester resin is not cured in one go, it is difficult to maintain consistency in all factors. This is like repairing car paint, just trying to be as close as possible, but not completely eliminating color differences. For example, when making a resin river table, some seemingly inexpensive epoxy resin
How long does it take for the mold adhesive to solidify properly?
How long does it take for the mold adhesive to solidify properly? Generally speaking, taking the common ethylene based mold adhesive coating as an example, at room temperature of 24 ℃ and with a curing agent addition of 1.5%, the curing time of the mold adhesive coating is about 90 minutes. If you have heating conditions, such as raising it to 60 ℃, the curing time will be shortened to about 45 minutes.
What is the thickness of fiberglass mold adhesive coating?
Generally speaking, it is recommended that the wet film thickness of the mold gel coat be 0.8-1mm, which is most suitable. This is not the actual final thickness of the gel coat, shrinkage and polishing will inevitably remove a certain thickness. Too thin, easy to expose the bottom and reduce the durability of fiberglass molds.
What is the release agent used for?
Release agent is a functional substance that lies between the mold and the finished product. It is a type o
What is the resin content of hand laid fiberglass?
Generally speaking, the resin content of hand laid fiberglass is between 65-70%, which means that the fiberglass content of pure felt or short cut layer should be between 30% (low) and 35% (high). The specific content is related to the lamination state and filling conditions of hand laid fiberglass. It is very important to effectively control the
What is the reason for the many pits after the resin dries?
There are many reasons that can lead to uneven surface after resin curing, but the root cause is still due to the shrinkage of polyester resin. The shrinkage of polyester resins in different systems varies, and the morphology of the reinforcement also affects the final effect of resin shrinkage.
How many liters is one kilogram of epoxy resin adhesive equivalent to?
Generally, the density of most liquid epoxy resin adhesives is around 1.1-1.2. You can simply assume that 1kg of epoxy resin is equal to 1L. If you want to use it very accurately, for example, the resin to curing dosage is based on volume ratio, not weight ratio.
Does adding too much epoxy resin curing agent have an impact?
Regardless of the type of polyester resin curing agent, precise matching is required, and epoxy resin is no exception. Returning to the main topic, what will be the impact of adding too much epoxy resin curing agent?
Can heating be used to reduce the viscosity of epoxy resin?
Can heating be used to reduce the viscosity of epoxy resin? Yes, but there are some things you need to pay attention to. In practical applications, the use of solvents to dilute epoxy resin adhesives, such as acetone or xylene, is the most common. Reducing resin viscosity through heating is also feasible, but the degree of reduction will have a certain range. Unlike using diluents, it can continuously reduce resin viscosity as the amount added increases.
Which is better, unsaturated resin or epoxy resin?
Which is better, unsaturated resin or epoxy resin?This question is a bit difficult to answer directly. Any product will have advantages and disadvantages, and choosing the right one is the best. A simple performance comparison between unsaturated resin and epoxy resin is expected to be helpful for beginners: Category
Can the demolding wax solvent still be used after it evaporates?
Someone asked, can the demolding wax after use become dry and harden into blocks without sealing? Indeed, there is a possibility. Workers who f
What type of resin is good for making resin tables?
To be honest, don't overly believe in any model. The same epoxy resin adhesive may be labeled as 10 models by distributors and sold at different prices to more innocent people.
A typical fiberglass product is a resin based product reinforced with fiberglass fabric, usually coated with decorative gel coat on the surface, which is a topcoat mixed with polyester resin and color paste. Obviously, the final performance of fiberglass components is directly related to the type of resin, the morphology of glass fibers, and the specific molding process.
Can fiberglass be polished free?
In theory, it is difficult to achieve because many factors can affect the surface effect of the final product. Although some fiberglass components have not been further polished, this is only based on your own standards. You believe it is feasible, but in reality, it is not. Why is it difficult to achieve
What epoxy resin adhesive is used for making wooden tables?
Almost all resin adhesives used for wooden tables are made of epoxy system, mainly due to good adhesion and high strength, as well as small shrinkage of epoxy resin adhesive, which can avoid problems such as cracking and large deformation after molding.
What should I do if I add less soft epoxy resin curing agent?
Like most polyester resins, the degree of curing of epoxy resins is mainly influenced by environmental temperature and the amount of curing agent added. If the epoxy resin is mixed with a curing agent and continues to cure at low temperatures, the curing reaction may be very slow, but it will eventually cure without much impact on strength.
How to treat the surface after epoxy resin curing? Rear painted parts
A customer has encountered a problem: due to the production needs of the product, the motor mold needs to be sealed with epoxy resin. Due to the thin packaging layer, the product is cured and the mold is opened, and some small pores often appear on the surface. Secondary repair is needed to achieve a beautiful appearance. The surface was filled with atomic ash and then treated with self spray paint. But the effect is not very satisfactory, and the adhesion of the paint is not very strong, which is easy to scrape off. I don't know if there is a better surface treat
What can be added to fiberglass resin to improve flame retardancy?
Engaging in the processing of fiberglass products, sometimes there may be situations where flame-retardant components are required, and customers may not be able to specify specific flame-retardant standards.
What are the curing agents for vinyl ester resins?
What are the curing agents for vinyl ester resins? The vast majority of vinyl resin curing agents use methyl ethyl ketone peroxide, abbreviated as MEKP.
How to use hand layed fiberglass roller?
After soaking each layer of fiberglass reinforcement with resin, lightly press and roll with hand on the fiberglass roller, which will remove any unwetted areas and bubbles from the laminated parts. For large-area tiled prepregs, a roller can be used to press and roll with relatively strong force to compact the prepreg.
What resin is used for fiberglass molds?
The resin used for making fiberglass molds needs to be determined based on your process and dimensional accuracy requirements. Simply put, like most hand laid fiberglass molds, you can use viny
How to determine the curing condition of epoxy curing agent?
In actual operation, the curing time can be determined by observing changes in the coating surface, touching, pressure testing, and other methods: 1. Observe the changes on the surface of the coating After initial application, the epoxy curing agent will appear in a relatively thin state, and over time, it will gradually form a smooth and sturdy surface. Therefore, the approximate curing time can be determined by observing surface changes.
How long is the curing time of epoxy resin at room temperature?
The curing time of epoxy resin curing agent refers to the time when epoxy resin and epoxy curing agent are mixed and cured to complete drying and hardening under certain conditions. Generally, the curing time is determined by various factors, including environmental temperature, humidity, ratio, dosage, and certain external additives. Therefore, determining the curing time of epoxy curing agents requires analysis based on specific circumstances.
How is prepreg stored? How long is the shelf life?
Regardless of the type of prepreg, it should be stored in an environment of -18 ℃, such as an freezer or cold storage. To avoid moisture, the prepreg should be allowed to warm back to room temperature before opening the polyethylene bag (complete packaging may take 48 hours).
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