1、 Industry pain points of storage failure of mixed rubber

The losses caused by the storage of mixed rubber during the production process of rubber products cannot be ignored. According to data from a large tire company in 2023, the scrap losses caused by improper storage of rubber materials amounted to 1.2% of the annual output value. Typical problems include:

• Coking case: A conveyor belt factory stored NR rubber material in summer, but due to excessive warehouse temperature, the entire batch of rubber material T10 was shortened by 60%

Frost phenomenon: White powder precipitates on the surface of EPDM rubber material used for automotive sealing strips after being stored for 3 weeks, which affects the subsequent rolling process

Performance degradation: After 6 months of storage of IIR rubber material for high-speed rail shock absorber pads, the tensile strength of vulcanized rubber decreases by 15%

2、 Analysis of key factors affecting storage stability

The impact mechanism of the formula system

(1) Dynamics of vulcanization system

The half-life of highly active promoters (such as TMTD) at 30 ℃ is only 45 days

Comparative experiment: The burning time of the CBS/TBBS combination is 3-5 times longer than that of TMTD

(2) Material compatibility chart

Migration rate of aromatic oil in NR: 0.5mm/month at 25 ℃

The adsorption equilibrium constant of antioxidant RD and white carbon black is K=2.3 × 10 ³

Quantitative impact of environmental parameters

(1) Temperature effect

Arrhenius equation verification: For every 10 ℃ increase in temperature, the coking rate increases by 2-3 times

Actual test data: When SBR rubber is stored at 35 ℃, the rate of increase in Mooney viscosity is four times that of 25 ℃

(2) Humidity effect

Critical relative humidity: Zinc oxide begins to deliquescence when RH>70%

Case: During the rainy season in southern China, the frost spraying rate of rubber materials increases by 40%

3、 System solution to enhance storage stability

Formula optimization technology

(1) New Stable System

Composite anti scorching agent (CTP+Ester type) extends the burning time to 200% of the regular formula

Case: After adopting this technology, a sealing component enterprise extended the storage period of the rubber material from 30 days to 90 days

(2) Packing interface engineering

Surface modification technology of white carbon black (silane coupling agent Si-69) reduces small molecule migration rate

Data: Modified plasticizer migration reduced by 65%

Innovation in Process Control

(1) Temperature control strategy

Two stage mixing process: Control the temperature of sulfurizing agent addition below 110 ℃

Effect: The Mooney fluctuation between batches of rubber materials in a certain enterprise decreased from ± 5 to ± 2

(2) Base rubber technology

Preparation of carbon black masterbatch to achieve a dispersion degree of over 95%

Application example: Tire tread rubber storage stability increased by 30%

Upgrading warehouse management

(1) Intelligent monitoring system

IoT temperature and humidity sensor+cloud based warning platform

Implementation case: A factory reduced abnormal losses by 80% through this system

(2) Advanced Packaging Solutions

Vacuum aluminum foil packaging technology

Data comparison: Traditional packaging has seen an 8% increase in door opening after 3 months, while vacuum packaging has only seen a 2% increase

4、 Storage performance evaluation method system

Rapid detection technology

Portable Mooney viscometer: on-site results within 5 minutes

Micro rheometer: Only 5g of sample is needed to complete T10 testing

Accelerated aging experimental method

Equivalent room temperature storage for 6 months at 70 ℃ for 72 hours

UV aging chamber simulates outdoor storage conditions

Microscopic analysis techniques

Microscopic infrared mapping analysis of frost composition distribution

XPS surface analysis detects the thickness of the migration layer

5、 Industry Best Practice Cases

Automotive sealing strip enterprise solution

Problem: EPDM rubber material has a storage period of less than 2 weeks in summer

measures:

(1) Install a constant temperature dehumidification system (23 ± 2 ℃, RH50%）

(2) Switching to delayed vulcanization system (Perkadox 14-40)

(3) Implement rubber material turnover kanban management

Effect: Extended storage period to 8 weeks, saving 1.2 million yuan in rubber material costs annually

Storage plan for giant engineering tires

Challenge: A single piece of rubber material weighs 1.5 tons, making it difficult to dissipate heat

Innovation:

(1) Specially designed ventilation bracket to ensure air circulation at the bottom

(2) Partition temperature control storage, forced ventilation in the central area

(3) Regular inspection of infrared thermal imaging

Result: The incidence of coke burning decreased from 15% to below 1%

Industry Observation:

With the advancement of Rubber Industry 4.0, the management of mixed rubber storage is shifting from experiential to data-driven. The "Rubber Health Index" model established by a multinational enterprise integrates 32 parameters to evaluate the real-time status of rubber materials, achieving an accuracy rate of 92% for abnormal warning. As a senior technical director said, "In the modern rubber industry, storage is no longer just simple material storage, but an extension of production processes

Through systematic formula design, precise process control, and intelligent warehouse management, enterprises can fully extend the storage period of mixed rubber by 2-3 times. This is not only a requirement for quality assurance, but also an important link in enhancing the competitiveness of enterprises. In the future, with the application of new materials and technologies, there will be new breakthroughs in the stability management of mixed rubber storage.