Silicone Foam Processing
Processing process of silicone foam
The processing of silicone foam is mainly divided into two types of process routes: solid-state molding and liquid injection. The core process and key technologies are as follows:
1、 Production process of solid silicone foam
Raw material preparation
Mix and stir the silicone rubber base material, foaming agent (such as hydroxyl compounds), flame retardant (composite system of aluminum hydroxide/spherical silicon, etc.), and coloring agent according to the formula ratio to form a uniform foam precursor composition.
Foaming and degassing
Static foaming: The mixture is left to stand in a constant temperature environment, and the foaming agent decomposes to produce gas, forming a microporous structure;
Centrifugal degassing: Excess gas is discharged through centrifugal separation, and the cell density is controlled within the range of 0.16-0.20 g/cm ³.
Compression molding
Mold pretreatment: Preheat to 160-180 ℃, spray food grade release agent (dosage 0.5-1.5 mg/cm ²);
Quantitative loading: Cut the rubber material according to 1.1-1.2 times the cavity volume (weight error ≤± 0.5%);
Sulfurization shaping:
Initial pressure stage: 5-10 MPa low-pressure exhaust to prevent bubbles;
High pressure stage: 15-25 MPa holding pressure, vulcanization time=thickness (mm) × 1.5 minutes (7.5 minutes for 5mm thickness), temperature strictly controlled at 170 ± 2 ℃.
Post processing technology
Flyedge removal: Medical grade products need to undergo -70 ℃ freeze embrittlement trimming;
Surface purification: plasma cleaning of residual release agent to ensure a dyne value greater than 50 mN/m;
Polishing and shaping: Mechanical polishing of the foam surface after demolding.
2、 Liquid Silicone (LSR) Foam Injection Process
Raw material mixing
Two component liquid silica gel (A=1:1) is added with crosslinking agent and catalyst, and homogenized by a precision mixer.
Injection molding
Mold preheating: temperature set at 170-200 ℃;
Precise injection: The mixed rubber material is injected into the mold cavity at high speed through an injection machine, and the pressure and temperature are controlled in conjunction to eliminate bubbles.
High temperature curing
The vulcanization reaction is completed inside the mold, and the catalyst accelerates cross-linking and curing (the time is adjusted according to the thickness of the product).
Company Profile
About Us
Depu Technology (Shenzhen) Co., Ltd. (hereinafter referred to as Depu) is a comprehensive service provider of organic silicone with a rich history of 15 years. We specialize in the production and distribution of various silicone products. For example, liquid silicone foam products and silicone rubber coil sheets. Our product thickness ranges from 0.1mm to 15mm, with a width of up to 4 meters. Every year, we provide over 500000 square meters of silicone materials/rolls/sheets to over 2000 satisfied customers worldwide.
Our mission
Our mission is to provide customers with comprehensive solutions, focusing on sealing, weight reduction, electromagnetic shielding, insulation, thermal conductivity, and high and low temperature resistance (-60~400 degrees). We strive to become a small giant in providing customized silicone rolled coil solutions and quickly produce samples to meet the special needs of our customers.
Our team
At Depu, our strength is our team. With a professional technical team, we provide personalized services to our customers. We have advanced research and development centers, production synthesis centers, detection and analysis centers, spectroscopy rooms, chemical testing rooms, electrical testing rooms, material comprehensive performance testing rooms and other facilities, which can provide customers with professional customized services.
Our clients
For many years, we have served various industries including new energy vehicles, outdoor communication cabinet equipment, robots, food contact, medical, new energy, electronics, power transmission and distribution, automotive transportation, furniture, building materials, etc. Our products and services are highly praised by these industries.
At Depu, we believe in the power of technology and innovation. We are committed to achieving excellence and sustainability in all our efforts, while respecting the environment and the communities we serve.
Our factory
- 48 patented technologies, including ceramicized silicone (temperature resistance -60 ℃~1000 ℃) and intelligent temperature control and insulation devices.
- The product has passed UL94 V0 flame retardant certification and has a waterproof rating of IPX8.
Qualification Certificate
- We have a high-tech enterprise certification.
Custom processing
Factory live shot
Our warehouse
