Analysis of the production process and raw material ratio of white PVC foam board

In the field of modern building materials, white PVC foam board is widely used in building wall insulation, advertising display boards, packaging materials and other aspects with its excellent properties such as light weight, heat insulation, moisture resistance and corrosion resistance. Behind its excellent performance, it is inseparable from the carefully designed production process and precise raw material ratio. This article will explore the production process of white PVC foam board in depth, especially the ratio of its main raw material-polyvinyl chloride (PVC) resin and auxiliary materials.

1. Raw material preparation: laying the foundation for quality
Polyvinyl chloride (PVC) resin: As the core component of white PVC foam board, PVC resin provides the basic physical and chemical properties of the product. It has good plasticity and processability, and is the basis for forming a foam structure. In the production process, it is crucial to select high-quality PVC resin, which directly affects the strength and durability of the final product.

Foaming agent: Foaming agent is the key raw material for producing foam structure, accounting for about 25% of the total formula. It introduces a large number of tiny bubbles into PVC resin through chemical reactions or physical changes to form a lightweight and porous structure. Different types of foaming agents (such as AC foaming agent, HCFC-142b, etc.) have a significant impact on the density, pore size distribution and mechanical properties of the foam. Therefore, choosing the right foaming agent and accurately controlling its dosage is the key to ensuring product quality.

Stabilizer: Since PVC is prone to degradation and discoloration during high-temperature processing, the addition of stabilizers is crucial. Stabilizers can inhibit the thermal degradation and light aging of PVC and maintain the stability and color of the product. There are many types, including heat stabilizers, light stabilizers, etc., accounting for about 5%-10% of the total formula. The specific proportion depends on product requirements and PVC resin type.

Additives: In addition to the above main raw materials, a series of additives need to be added to improve product performance, such as plasticizers, lubricants, impact modifiers, etc. Although these additives account for a relatively low proportion (about 5%-10% in total), they play an indispensable role in improving product processability, flexibility, impact resistance, etc.

2. Accurate ratio: ensure stable performance
In the production of white PVC foam boards, the accurate ratio of raw materials is the prerequisite for ensuring product quality. Generally speaking, the content of resin accounts for about 60% of the total formula, which ensures the basic strength and durability of the product. The 25% content of the foaming agent is the key to forming an ideal foam structure. Too much will cause the foam to be too soft and the strength to decrease, while too little will cause the foam to be not loose enough, affecting the thermal insulation performance. The 15% ratio of stabilizers and additives is finely controlled to ensure the stability and comprehensive performance of the product during processing and use.

3. Production process: achieving excellent quality
After the raw material ratio is determined, it is necessary to go through a series of complex production process flows such as mixing, extrusion, foaming, cooling, and cutting. Among them, temperature control, screw speed adjustment, and precise control of foaming time during extrusion are all key factors affecting the final quality of the product. Through advanced automated production equipment and a strict quality control system, it can be ensured that each piece of white PVC foam board meets the established performance indicators.

The production of white PVC foam board is a comprehensive process that integrates raw material selection, precise ratio and advanced technology. Only by strictly controlling every link can we produce products with excellent performance and stable quality. With the continuous development of the construction industry and the increasing environmental protection requirements, the application prospects of white PVC foam boards will be broader, and their production processes and raw material ratios will continue to be optimized to meet the increasingly diversified needs of the market.