What should we pay attention to when processing acrylic resin materials?

When processing acrylic resin materials, there are matters needing attention in raw material preparation, processing environment, processing equipment and technology, and post-treatment of products. The following are the specific contents:

raw materials preparation

Storage conditions: acrylic resin usually exists in liquid or solid form, and should be stored in a cool, dry and well-ventilated warehouse, away from fire sources and heat sources, to prevent direct sunlight. Different types of acrylic resin may have different storage temperature requirements, generally between 5℃ and 35℃, and should be stored in strict accordance with the product instructions to prevent the resin from deterioration or performance degradation.

Inspection of raw materials: Before use, it is necessary to inspect the raw materials of acrylic resin to see if there are any abnormal phenomena such as discoloration, turbidity and precipitation, and at the same time, check whether the information such as model, specification and batch are in line with the production requirements. It is also necessary to test its performance indicators, such as solid content, viscosity, acid value, etc., to ensure that the quality of raw materials meets the processing requirements.

Processing environment

Temperature and humidity: The temperature and humidity of the processing environment have an important influence on the processability of acrylic resin and the quality of the final product. Generally speaking, the suitable processing temperature is between 15℃ and 35℃, and the humidity is between 40% and 70%. If the temperature is too low, the viscosity of the resin will increase and the fluidity will deteriorate, which will affect the processing operation. If the temperature is too high, the resin may undergo thermal degradation or crosslinking reaction, which will reduce the product performance. Excessive humidity will make the resin absorb moisture in the air, leading to defects such as foaming and whitening of the coating.

Ventilation conditions: Because the acrylic resin may volatilize organic solvents and produce harmful gases during processing, the processing site needs good ventilation conditions to ensure the health and safety of operators and prevent the accumulation of combustible gases from causing safety accidents. Ventilation equipment, such as exhaust fans and ventilation pipes, can be installed to ensure indoor air circulation.

Processing equipment and technology

Equipment selection: according to the processing technology and product requirements, select the appropriate processing equipment. For example, in the production of coatings, the mixing equipment should have sufficient mixing intensity and uniformity to ensure that the resin is fully mixed with other raw materials; Grinding equipment should be able to grind solid particles such as pigments to a suitable fineness to improve the performance of coatings. For molding processing, such as extruder, injection molding machine and other equipment, the reasonable selection should be made according to the rheological properties of acrylic resin and the shape and size of products.

Processing temperature control: In the process of processing, strictly controlling the temperature is the key. Taking extrusion molding as an example, different acrylic resin materials have different processing temperature ranges, generally between 180℃ and 250℃. If the temperature is too low, the resin will be poorly plasticized, and the surface of the product will have defects such as roughness and bubbles; If the temperature is too high, the resin will decompose and change color easily, which will affect the product quality. It is necessary to monitor and adjust the temperature of the barrel, the head, the mold and other parts through an accurate temperature control system.

Processing speed adjustment: Processing speed will also affect the processing effect of acrylic resin. For example, in the coating process, too fast coating speed may lead to uneven coating thickness and poor leveling; Too slow speed will affect production efficiency. According to the viscosity of resin, the performance of coating equipment and the quality requirements of products, the coating speed should be adjusted reasonably. In the process of extrusion and injection molding, the parameters such as screw speed and injection speed also need to be optimized according to the characteristics of resin and product structure.

Post-treatment of products

Curing treatment: After acrylic resin is processed into products, it usually needs curing treatment to improve the performance of the products. Curing conditions such as temperature, time and humidity should be strictly controlled. For example, for thermosetting acrylic resin coatings, the curing temperature is generally between 80℃ and 150℃, and the curing time depends on the coating thickness and resin type, generally ranging from 10 minutes to several hours. During the curing process, the temperature should be uniform to avoid local overheating or incomplete curing.

Cleaning and packaging: after the processing is completed, the equipment and tools should be cleaned in time to prevent the acrylic resin residue from blocking the equipment or affecting the next processing. Proper solvents, such as ethanol and acetone, should be used for cleaning, and the cleaning should be carried out in accordance with the safety operation procedures. For finished products, packaging should be carried out according to product characteristics and customer needs, and appropriate packaging materials, such as plastic films and cartons, should be selected to prevent products from being damaged during transportation and storage.

In addition, some organic solvents and chemicals are involved in the processing of acrylic resin, some of which may be irritating, corrosive or toxic. Operators should wear protective glasses, gloves, masks and other personal protective equipment to avoid skin contact and inhalation of harmful gases. At the same time, we should understand the relevant safety knowledge and emergency treatment methods, and take effective measures to deal with accidents such as leakage and fire in time.