Why does inflatable rubber fender undergo vulcanization? What are the inspection standards?

Why does inflatable rubber fender undergo vulcanization?

1. The main factor affecting the vulcanization process is the amount of sulfur used. The more dosage, the faster the vulcanization rate, and the higher the achievable degree of vulcanization. The solubility of sulfur in rubber is limited, and excessive sulfur will precipitate from the surface of the rubber. In order to reduce the injection of sulfur, sulfurization needs to be carried out at the lowest possible temperature or at least below the melting point of sulfur. According to the usage requirements of rubber products, the sulfur content in soft rubber is generally below 3%, the sulfur content in semi-rigid rubber is generally around 20%, and the sulfur content in hard rubber is as high as 40% or more. Curing temperature. When the temperature exceeds 10 degrees Celsius, the curing time is shortened by about half. Because rubber is a poor thermal conductor, the vulcanization of the product will vary with the temperature of its parts. In order to ensure a relatively uniform degree of vulcanization, thick rubber products are usually subjected to continuous heating and long-term low-temperature vulcanization.

2. Sulfurization time: This is an important step in the vulcanization process. If the time is too short, sulfur deficiency may occur. Long term exposure can lead to sulfur. Only an appropriate degree of vulcanization can ensure good overall performance.

According to different vulcanization conditions, it can be divided into three categories: cold vulcanization, room temperature vulcanization, and hot vulcanization. 1. Cold vulcanization can be used for the vulcanization of thin film products. Soak the inflatable rubber fender in a solution, then clean and dry it. During room temperature vulcanization, the vulcanization process is carried out at room temperature and normal pressure, such as using room temperature vulcanized rubber slurry (mixed rubber solution) to repair bicycle pipe joints. 3. Thermal vulcanization is the main method for vulcanizing rubber products. According to the different curing media and curing methods, thermal curing can be divided into direct curing, indirect curing, and mixed gas curing.

The inspection standards for inflatable rubber fenders are as follows:

1. Appearance inspection. During the vulcanization process, perform a visual inspection on the first mold part of the job and inspect the finished product. The method of visual inspection is generally adopted. When checking the glossiness of the working surface of the parts, use the glossiness specified in the mold drawing as the reference.

   
   

2. Dimensional inspection. During the vulcanization process, rapid mold inspection is generally required for finished products. However, for parts with strict dimensions, parts that need to be processed, and parts that require stable processing in the working medium, all inspections are generally required.

3. The fiber material of the inflatable rubber fender must be dried and impregnated before use. The purpose is to reduce the moisture content of fiber materials, prevent water evaporation and foaming, increase the temperature of fiber materials, and ensure the quality of rubber fenders. The purpose of the pre dipping process is to improve the bonding performance between fiber materials and rubber materials. The basic processes involved in the rolling process are preheating and supplying the mixed rubber. Before rolling, preliminary processing of rubber materials and fabrics is required. Rubber is refined by a hot refining machine before entering the rolling mill.

4. This process is called hot refining or preheating, which aims to improve the mixing uniformity of rubber materials, further enhance plasticity, increase temperature, and improve plasticity. In order to improve the adhesion performance between pulp and fabric and ensure the quality of winding, it is necessary to dry the fabric. The moisture content must be controlled between 1% and 2%. The moisture content is too low, the fabric is too hard, and it is easy to break during the rolling process. The moisture content is too high, and the adhesion is poor.