CN-122011509-A - Intercalated hydrotalcite and preparation method and application thereof

CN122011509ACN 122011509 ACN122011509 ACN 122011509ACN-122011509-A

Abstract

The invention belongs to the technical field of modified polypropylene plastics, and discloses an intercalated hydrotalcite, a preparation method and application thereof, which are characterized in that the preparation method comprises a first mode or a second mode; the first mode is to mix the mixed solution A with the mixed solution B and then react in the presence of protective gas to obtain intercalated hydrotalcite, the second mode is to contact and react the mixed solution A with the mixed solution B in the presence of protective gas to obtain intercalated hydrotalcite, wherein in the first mode and the second mode, the mixed solution A is the mixed solution of metal salt and modifier, and the mixed solution B is the mixed solution of precipitant and functional object. The preparation method directly obtains the corresponding surface organic modified LDHs in one step, reduces the agglomeration tendency in the storage and use processes, and improves the dispersibility of the intercalated hydrotalcite.

Inventors

BAI YIQING
GAO DALI
XU KAI
FENG YONGJUN
TANG PINGGUI
XU MENG
QUAN HUI
LU HONGCHAO

Assignees

中国石油化工股份有限公司
中石化(北京)化工研究院有限公司
北京化工大学

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. The preparation method of the intercalated hydrotalcite is characterized by comprising a first mode or a second mode; Mixing the mixed solution A and the mixed solution B, and then reacting in the presence of protective gas to obtain the intercalated hydrotalcite; In the presence of protective gas, the mixed solution A and the mixed solution B are contacted and reacted to obtain the intercalated hydrotalcite; in the first mode and the second mode, the mixed solution A is a mixed solution of metal salt and a modifier, and the mixed solution B is a mixed solution of a precipitant and a functional object.
2. The preparation method according to claim 1, wherein the metal salt comprises a divalent metal salt and a trivalent metal salt; the divalent metal ion of the divalent metal salt is at least one of Mg 2+ 、Zn 2+ 、Co 2+ 、Ni 2+ 、Ca 2+ 、Fe 2+ and Cu 2+ ; The trivalent metal ion of the trivalent metal salt is at least one of Al 3+ 、Co 3+ 、Ti 3+ 、Fe 3+ and Cr 3+ ; The molar ratio of the divalent metal ion M 2+ to the trivalent metal ion M 3+ of the metal salt is (2-4) 1; Preferably, the metal salt is an inorganic metal salt.
3. The preparation method according to claim 1, wherein the precipitant is at least one of NaOH, KOH, ammonia, urea, and hexamethylenetetramine.
4. The preparation method of claim 1, wherein the modifier is at least one of Sodium Dodecyl Sulfate (SDS), sodium dodecyl sulfonate, sodium oleate, sodium stearate, and disodium edetate.
5. The process according to claim 1, wherein the functional guest is an antioxidant, and the antioxidant is preferably a hindered phenol compound, and more preferably at least one of beta- (3, 5-di-t-butyl-4-hydroxyphenyl) propionic acid, beta- (3, 5-di-t-butyl-4-hydroxyphenyl) propionic acid sodium, beta- (3-t-butyl-4-hydroxy-5-methylphenyl) propionic acid sodium, 3, 5-di-t-butyl-4-hydroxybenzoic acid and 3, 5-di-t-butyl-4-hydroxybenzoic acid sodium salt.
6. The preparation method of claim 1, wherein the molar ratio of the modifier to the metal salt is 1 (10-200); the molar ratio of the metal salt to the precipitant is 1 (1.5-3); the mole ratio of the functional object to the precipitator is 1 (1-4); In the mixed solution A, the molar concentration of divalent metal ions M 2+ of the metal salt is 0.01-1 mol/L; in the mixed solution B, the molar concentration of the functional object is 0.01-1 mol/L.
7. The preparation method according to claim 1, wherein in the first and second modes, the reaction temperature is 25-180 ℃ and the reaction time is 1-12 hours; In the second mode, the pH value of the reaction system is controlled to be 9.5-10.5.
8. Intercalated hydrotalcite prepared by the preparation method of any one of claims 1 to 7.
9. Use of the intercalated hydrotalcite of claim 8 as an aid for lowering the crystallization temperature of the polymer.
10. Use according to claim 9, wherein the polymer is a polypropylene resin.

Description

Intercalated hydrotalcite and preparation method and application thereof Technical Field The invention relates to the technical field of modified polypropylene plastics, in particular to intercalated hydrotalcite and a preparation method and application thereof. Background Polypropylene is a widely used thermoplastic plastic and is widely used in various fields of construction, food packaging, medical equipment, toys and the like due to low processing cost, good mechanical properties, non-toxicity and easy processability. Polypropylene as a semi-crystalline polymer, the crystallization speed and crystal size of which have a great influence on the mechanical, optical and thermal properties of the product. As the demand for functional polypropylene increases, polypropylene modification studies become increasingly important. The addition of nucleating agents to polypropylene is a common means of modifying polypropylene. The nucleating agent promotes the crystallization of the polypropylene by providing crystal nucleus, and improves the crystallization temperature and crystallization speed of the polypropylene. The commonly used nucleating agents are inorganic nucleating agents such as talcum powder, silicon dioxide and mica, and organic nucleating agents such as aryl phosphates and sorbitol. However, there are few reports of decreasing the crystallization temperature of polypropylene and delaying the crystallization rate of polypropylene. CN 107835841B devised a polymer composition with delayed crystallization, an azine dye and an ionic liquid, but this method affects the optical properties of the article, limiting its application in many fields. The composite metal hydroxide (LDHs: layered Double Hydroxides) is an important anionic inorganic lamellar material, the chemical composition of which can be expressed as [ M 2+1-xM3+x(OH)2](An-)x/n·mH2 O ] and is a graphite-like hexagonal lamellar compound formed by orderly assembling divalent and trivalent metal cations M 2+ and M 3+ host laminates and an interlayer anion guest A n-. LDHs have been widely studied in the fields of catalytic materials, functional membrane materials, adsorption materials, functional auxiliaries and the like due to the chemical composition of the host laminates, the types and the number of guests, the in-layer elastic space and the interaction adjustability of the host and guest. In the face of diversified reaction environments in various fields, the hydrophilic LDHs with electropositive surfaces cannot meet the requirements, and the LDHs is generally required to be subjected to surface modification aiming at the required reaction environments, so that the surface charge properties and the affinity of the LDHs to reactants are changed, and the LDHs functional material with excellent performance is obtained. Disclosure of Invention The invention aims to provide an intercalated hydrotalcite, a preparation method and application thereof, wherein the intercalated hydrotalcite has hydrophobic surface property, reduces the agglomeration tendency in the storage and use processes, and improves the dispersibility of the intercalated hydrotalcite; the intercalated hydrotalcite of the invention can be well dispersed in a polymer matrix, so that the crystallization temperature of the polymer is reduced, and the purposes of regulating and controlling the processing stability, mechanical property and optical property of the product can be achieved by regulating the crystallization temperature and crystallization speed of the polymer in processing and application. The first aspect of the present invention provides a method for preparing intercalated hydrotalcite, the method comprising the steps of mode one or mode two; Mixing the mixed solution A and the mixed solution B, and then reacting in the presence of protective gas to obtain the intercalated hydrotalcite; In the presence of protective gas, the mixed solution A and the mixed solution B are contacted and reacted to obtain the intercalated hydrotalcite; in the first mode and the second mode, the mixed solution A is a mixed solution of metal salt and a modifier, and the mixed solution B is a mixed solution of a precipitant and a functional object. The second aspect of the present invention provides an intercalated hydrotalcite prepared by the above preparation method. In a third aspect the present invention provides the use of an intercalated hydrotalcite as described above as an adjunct for reducing the crystallization temperature of a polymer. The technical scheme of the invention has the following beneficial effects: (1) The preparation method directly obtains the corresponding surface organic modified LDHs in one step, reduces the agglomeration tendency in the storage and use processes, and improves the dispersibility of the intercalated hydrotalcite. (2) The hydrotalcite with the intercalation structure can be well dispersed in a polymer matrix, so that the crystallization temperature of the