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CN-122011698-A - Rubber composite additive with long-acting low-color-rendering performance and high mechanical performance as well as preparation method and application thereof

CN122011698ACN 122011698 ACN122011698 ACN 122011698ACN-122011698-A

Abstract

The invention discloses a rubber composite additive with long-acting low-color property and high mechanical property, and a preparation method and application thereof, wherein the rubber composite additive comprises 60-90% of high-molecular-weight long-chain aliphatic active agent and 10-40% of low-molecular-weight nonionic surfactant. The invention aims to solve the technical defects that the existing protection system is short in protection time and difficult to consider the excellent mechanical properties of the rubber matrix. According to the invention, the synchronous improvement of the appearance and mechanical properties of the rubber product is realized by constructing a space-time cooperative dispersion system of the large and small molecular weight surfactant and an in-situ mechanical compensation mechanism. According to the invention, through organic compounding of a large and small molecular weight active agent composite system, the relay from initial small molecule rapid blocking and stacking to long-term large molecule slow overflow is realized, the space-time dynamic synergistic dispersion of the color development small molecule long migration period on the rubber surface is realized, and the good long-acting low-color expression of the product is endowed.

Inventors

  • CHEN YULONG
  • Lv Xingzhi

Assignees

  • 浙江工业大学

Dates

Publication Date
20260512
Application Date
20260305

Claims (10)

  1. 1. The rubber composite additive with long-acting low-color-rendering performance and high mechanical performance is characterized by comprising the following components in percentage by mass as 100): 60% to 90% of a high molecular weight long chain aliphatic active agent; low molecular weight nonionic surfactant 10% to 40%.
  2. 2. The rubber compounding aid having both long-acting low-flooding property and high mechanical property according to claim 1, wherein the number average molecular weight of the high molecular weight long-chain aliphatic active agent is 1000 to 5000.
  3. 3. The rubber composite additive with long-acting low-flooding performance and high mechanical performance according to claim 1, wherein the high-molecular-weight long-chain aliphatic active agent is one or more of poly (1, 4-butylene adipate), poly (1, 4-butylene succinate) and polycaprolactone.
  4. 4. The rubber composite additive with long-acting low-flooding performance and high mechanical performance according to claim 1, wherein the molecular weight of the low-molecular-weight nonionic surfactant is 200-1000.
  5. 5. The rubber composite additive with long-acting low-flooding performance and high mechanical performance according to claim 1, wherein the low-molecular-weight nonionic surfactant is one or two of sorbitan stearate and sorbitan monooleate.
  6. 6. The method for preparing the rubber composite additive with long-acting low-color-rendering properties and high mechanical properties according to any one of claims 1 to 5, which is characterized by comprising the following steps: And (3) putting the high-molecular-weight long-chain aliphatic active agent and the low-molecular-weight nonionic surfactant into a mechanical stirring reaction kettle with a temperature control system, heating to 60-90 ℃, starting a mechanical stirrer to perform high-shear full mixing and stirring after the ester substances are completely melted, taking out and cooling to room temperature to solidify the mixture, and then performing crushing treatment and screening by a mesh screen to obtain the composite active agent master batch, namely the rubber composite additive with long-acting low-color property and mechanical property.
  7. 7. The use of a rubber compounding aid with long-acting low-flooding performance and high mechanical performance according to any one of claims 1-5 for preparing rubber with long-acting low-flooding performance and high mechanical performance.
  8. 8. The use according to claim 7, characterized in that it comprises in particular: and (3) putting raw rubber into a roll before complete packaging, plasticating the raw rubber into the roll, cutting the raw rubber into the roll for later use after a plurality of times, setting the temperature of a Hark internal mixer to be 75-85 ℃, adding the plasticated rubber into the roll, sequentially adding zinc oxide, stearic acid, carbon black, an anti-aging agent, an antioxidant and aromatic hydrocarbon oil into the roll, adding a rubber composite additive with long-acting low-color property and mechanical property after uniform mixing, continuously mixing the rubber composite additive, discharging the rubber, and finally vulcanizing and forming the rubber with long-acting low-color property and mechanical property.
  9. 9. The use according to claim 8, wherein the raw rubber is natural rubber or artificial rubber; The artificial rubber is butadiene rubber, styrene-butadiene rubber or ethylene propylene diene monomer rubber.
  10. 10. The use according to claim 8, wherein the mass ratio of the raw rubber to the rubber compounding auxiliary agent with long-acting low-color property and mechanical property is 100:1.9-4.

Description

Rubber composite additive with long-acting low-color-rendering performance and high mechanical performance as well as preparation method and application thereof Technical Field The invention relates to the field of rubber additives, in particular to a rubber composite additive with long-acting low-color-rendering performance and high mechanical performance, and a preparation method and application thereof. Background Rubber is used as an elastomer material with wide application, and a plurality of functional additives (such as reinforcing systems of carbon black, white carbon black and the like, softening systems of aromatic oil, naphthenic oil and the like, and protective systems of anti-aging agents and the like) are usually compounded in industrial processing to meet the stringent mechanical and anti-aging requirements. However, in the parking and service process after the rubber vulcanization molding, the small molecular auxiliary agent in the rubber material is easily dissociated from the matrix and slowly migrates to the surface of the product under the dual drive of the internal concentration gradient and the molecular thermal motion. When free small molecules containing chromophoric or auxiliary chromophoric groups (such as conjugated systems in incompletely cracked polycyclic aromatic hydrocarbon, amines or phenol antioxidants containing hetero atoms and the like) migrate in large quantity and precipitate to the surface of the product, aggregation is extremely easy to occur and a microcosmic continuous film layer is formed. The surface enriched liquid film can cause film interference effect in macroscopic optics, thereby causing the surface of the rubber product to present a 'glowing' appearance defect of a glowing, reddish and the like seven-color oil film. The appearance defects not only obviously reduce the appearance quality and the added value of high-added-value rubber products (such as high-grade treads, high-grade daily sealing elements, baby stroller tires, decorative parts and the like), but also have potential biostimulation and health hidden trouble in human body or environment contact of partially separated polycyclic aromatic hydrocarbon substances. In addition, flooding often accompanies blooming and also affects appearance. Aiming at the surface defects and the safety problems, the prior art in the field mainly focuses on constructing a micro passive restraint mechanism in a rubber matrix or realizing source slow release of components. Specifically, the existing approximation technical scheme can be summarized into the following technical paths: 1. The physical adsorption and microcapsule coating slow release technology is that the slow release is realized by prolonging the diffusion path of small molecules. For example, inert filler with high specific surface area or waste tyre based mesoporous carbon is introduced into a rubber matrix for physical adsorption, or nano cellulose, silicon dioxide-alginate and the like are adopted for constructing porous composite microcapsules, and small molecules which are easy to separate out such as an anti-aging agent and the like are coated by a shell layer, so that the local accumulation concentration of chromonic molecules on the surface of the product is reduced. (the above scheme is selected from the group consisting of application number CN202310867542.8, CN202111258522.8 and CN 202110125235.3) 2. The porous collaborative salting-out physical fixation technology is that the proposal utilizes porous materials to carry out microcosmic restraint by matching with ion effect. For example, the developed pore structure of silica gel microspheres is utilized to carry out physical adsorption, and the salting-out effect of sodium chloride is matched to enhance the hydrophobic interaction inside a polymer cross-linked network, so that free chromophoric small molecules are limited inside a rubber matrix. (the above scheme is selected from application number: CN 202510444634.4) 3. The scheme realizes the chemical fixation of the ubiquitin molecules by introducing surface modified nano-montmorillonite, a specific silane coupling agent composition and active metal ions (such as Cu 2+ and the like) into a system and utilizing the physical confinement effect of montmorillonite two-dimensional sheets, pi-pi stacking effect of a hydrophobic end of the coupling agent and the coordination complexing effect between metal cations and chromophoric or color assisting groups (such as O, N heteroatom). (the above scheme is selected from application number: CN 202511566946.9) 4. The environmental protection component replacement and covering technology is characterized in that the scheme focuses on reducing the introduction of color-prone substances from the source of the formula. For example, a bio-based plasticizer without polycyclic aromatic hydrocarbon is used to replace the traditional operating oil, and titanium dioxide is used as an auxiliary material for optic