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CN-122011516-A - Low-haze monocyclic carboxylate nucleating agent and preparation method thereof

CN122011516ACN 122011516 ACN122011516 ACN 122011516ACN-122011516-A

Abstract

The invention provides a low-haze monocyclic carboxylate nucleating agent and a preparation method thereof, and relates to the technical field of nucleating agents. The low-haze monocylic carboxylate nucleating agent is prepared from the following raw materials, by weight, 70-80 parts of monocylic carboxylate, 4-8 parts of a high-efficiency antioxidant, 8-10 parts of dibenzylidene sorbitol, 4-8 parts of modified calcium carbonate, 3-6 parts of modified talcum powder and 1-3 parts of zinc stearate. The invention utilizes the synergistic effect of zinc stearate and the monocyclic carboxylate nucleating agent to greatly reduce the crystallization peak temperature of the plastic, ensures the requirements of lower haze and high rigidity of the plastic, and simultaneously can absorb and disperse the heat generated by the plastic in the processing and using processes by matching with inorganic fillers such as modified talcum powder and the like, thereby further improving the thermal stability of the plastic and improving the yellowing resistance and the thermal stability of the plastic by matching with the high-efficiency antioxidant. And the dibenzylidene sorbitol nucleating agent is matched, so that the crystal size is reduced, the uniform distribution of crystals is promoted to the greatest extent, and the haze of plastics is obviously reduced.

Inventors

  • QIU FENG
  • SU CHENGWU

Assignees

  • 大连市长兴岛青藤树新材料科技有限责任公司

Dates

Publication Date
20260512
Application Date
20260401

Claims (5)

  1. 1. The low-haze monocylic carboxylate nucleating agent is characterized by being prepared from the following raw materials, by weight, 70-80 parts of monocylic carboxylate, 4-8 parts of efficient antioxidant, 8-10 parts of dibenzylidene sorbitol, 4-8 parts of modified calcium carbonate, 3-6 parts of modified talcum powder and 1-3 parts of zinc stearate.
  2. 2. The low haze monocylic carboxylate nucleating agent of claim 1, wherein the method of preparing the modified calcium carbonate comprises the steps of: a) Drying the calcium carbonate at 80 ℃ for 24 hours; b) Mixing (18-22) of dried calcium carbonate, (1-3) of stearic acid and (1-3) of a silane coupling agent after hydrolysis; c) Stirring at 110deg.C at 30r/min for 10-15min; d) The chamber temperature was cooled to 30 ℃ to obtain the modified calcium carbonate.
  3. 3. The low haze monocylic carboxylate nucleating agent of claim 1, wherein the modified talc is prepared by a process comprising the steps of: a) Mixing talcum powder and sodium hydroxide solution with the mass fraction of 20% according to the weight ratio of (0.5-1.5) (5-15), stirring for 6h at 80 ℃ and 300r/min, washing with water for three times, centrifuging, and vacuum drying for 24h at 80 ℃ and 0.01MPa to obtain talcum powder with surface hydroxylation; b) And (3) modifying the coupling agent, namely mixing the talcum powder with the surface hydroxylation obtained in the step a), 75% ethanol solution and silane coupling agent (5-15) and (80-90) and (1-3) in parts by weight, stirring for 6 hours at the temperature of 85 ℃ and 50r/min, cooling to room temperature, washing with absolute ethanol for three times, and vacuum drying for 24 hours at the temperature of 80 ℃ to obtain the modified talcum powder.
  4. 4. The low haze monocylic carboxylate nucleating agent of claim 3, wherein in step b) the talc is fully dispersed in 75% ethanol solution prior to adding the silane coupling agent.
  5. 5. The method for preparing a low haze monocylic carboxylate nucleating agent according to any one of claims 1-4, comprising the steps of: And adding the monocyclocarboxylate, the high-efficiency antioxidant, the dibenzylidene sorbitol, the modified calcium carbonate, the modified talcum powder and the zinc stearate into a high-speed mixer according to the weight parts, and mixing for 15-30 minutes at the speed of 500-800r/min at room temperature to obtain the low-haze monocyclocarboxylate nucleating agent.

Description

Low-haze monocyclic carboxylate nucleating agent and preparation method thereof Technical Field The invention relates to the technical field of nucleating agents, in particular to a low-haze monocyclic carboxylate nucleating agent and a preparation method thereof. Background Polyolefin materials such as polypropylene and polyethylene are widely used in the fields of packaging, automobiles, home appliances, daily necessities and the like due to excellent comprehensive properties, low cost and good processability. However, unmodified polyolefins generally have a slow crystallization rate, low crystallinity, resulting in articles having poor transparency (high haze), low gloss, insufficient rigidity, and long molding cycles. And the addition of nucleating agents is an effective way to solve the above-mentioned problems. The nucleating agent can be used as heterogeneous crystal nucleus, obviously improves the crystallization rate of the polymer, refines the size of spherulites, thereby improving the transparency, the glossiness, the rigidity and the heat distortion temperature of the product and shortening the molding cycle. At present, a commonly used nucleating agent, such as an organic carboxylate nucleating agent, is a dispersion type polypropylene reinforced modified nucleating agent and has a certain effect on improving the rigidity, the surface hardness and the like of polyolefin plastic products. Among other things, hexahydrophthalic acid (HHPA) metal salts can provide excellent crystallization temperature, modulus and acid scavenger compatibility for polypropylene. However, in practical applications, the existing hexahydrophthalic acid (HHPA) metal salt nucleating agent has high haze when used for modification of polypropylene nucleating agent, affects the appearance quality of the final product, and is difficult to use in products with high transparency requirements. Therefore, we propose a new low haze monocylic carboxylate nucleating agent and a method for preparing the same. Disclosure of Invention The invention aims to provide a low-haze monocylic carboxylate nucleating agent and a preparation method thereof, and the system realizes the synergistic effect of all components through the compounding of specific components and the surface modification of inorganic fillers, and obviously reduces the haze of polymer products and improves the thermal stability of the polymer products while ensuring high nucleation efficiency. The low-haze monocylic carboxylate nucleating agent is prepared from the following raw materials, by weight, 70-80 parts of monocylic carboxylate, 4-8 parts of a high-efficiency antioxidant, 8-10 parts of dibenzylidene sorbitol, 4-8 parts of modified calcium carbonate, 3-6 parts of modified talcum powder and 1-3 parts of zinc stearate. Preferably, the preparation method of the modified calcium carbonate comprises the following steps: a) Drying the calcium carbonate at 80 ℃ for 24 hours; b) Mixing (18-22) of dried calcium carbonate, (1-3) of stearic acid and (1-3) of a silane coupling agent after hydrolysis; c) Stirring at 110deg.C at 30r/min for 10-15min; d) The chamber temperature was cooled to 30 ℃ to obtain the modified calcium carbonate. Preferably, the preparation method of the modified talcum powder comprises the following steps: a) Mixing talcum powder and sodium hydroxide solution with the mass fraction of 20% according to the weight ratio of (0.5-1.5) (5-15), stirring for 6h at 80 ℃ and 300r/min, washing with water for three times, centrifuging, and vacuum drying for 24h at 80 ℃ and 0.01MPa to obtain talcum powder with surface hydroxylation; b) And (3) modifying the coupling agent, namely mixing the talcum powder with the surface hydroxylation obtained in the step a), 75% ethanol solution and silane coupling agent (5-15) and (80-90) and (1-3) in parts by weight, stirring for 6 hours at the temperature of 85 ℃ and 50r/min, cooling to room temperature, washing with absolute ethanol for three times, and vacuum drying for 24 hours at the temperature of 80 ℃ to obtain the modified talcum powder. Preferably, in the step b), the talcum powder is fully dispersed in 75% ethanol solution, and then the silane coupling agent is added. The invention also provides a preparation method of the low-haze monocylic carboxylate nucleating agent, which comprises the following steps: And adding the monocyclocarboxylate, the high-efficiency antioxidant, the dibenzylidene sorbitol, the modified calcium carbonate, the modified talcum powder and the zinc stearate into a high-speed mixer according to the weight parts, and mixing for 15-30 minutes at the speed of 500-800r/min at room temperature to obtain the low-haze monocyclocarboxylate nucleating agent. Compared with the prior art, the invention has the beneficial effects that: The invention utilizes the synergistic effect of zinc stearate and the monocyclic carboxylate nucleating agent to greatly reduce the crystallization peak temperature of the