Modified pop polyether, and preparation method and application thereof

Abstract

The application provides a modified POP polyether, a preparation method and application. The modified POP polyether is synthesized from raw materials including 40-70 parts by weight of polyether, 20-50 parts by weight of a vinyl monomer, 0.1-1.0 parts by weight of an initiator, 1.0-5.0 parts by weight of a dispersant, 0.5-2.0 parts by weight of a chain transfer agent, 0.1-1.0 parts by weight of a chain extender and 0.1-0.5 parts by weight of a hyperbranched macromolecule. The modified POP polyether has high conversion rate of the vinyl monomer, good stability of the POP polyether, and the product after preparation does not need to be separated and purified, and can be directly used in polyurethane foaming materials, and the obtained polyurethane material has good performance.

Description

Technical Field

[0001] This invention relates to the field of polymer technology, and particularly to the field of polyether polyol (POP) synthesis technology, especially to a modified POP polyether, its preparation method, and its application. Background Technology

[0002] Polymer polyols (POPs) are modified varieties obtained by graft polymerization of vinyl monomers onto general-purpose polyether polyols as the base polyether. They retain the flexibility of the polyether backbone while possessing the rigidity of vinyl polymers. Polyurethane foams prepared using POPs exhibit high load-bearing capacity and good resilience. However, currently, the uneven distribution of microspheres in the polymer polyol system can affect the storage stability of POPs and the performance of subsequent polyurethane foam materials. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. The purpose of this invention is to provide a method for synthesizing modified POP polyether, which produces a POP system with uniform particle size distribution and good storage stability; simultaneously, the polyurethane foam material obtained using this polyether exhibits high strength.

[0004] In a first aspect of the invention, a modified POP polyether is provided, prepared from raw materials comprising the following weights:

[0005] 40-70 parts by weight of polyether,

[0006] 20-50 parts by weight of vinyl monomer,

[0007] 0.1 to 1.0 parts by weight of initiator,

[0008] 1.0 to 5.0 parts by weight of dispersant,

[0009] 0.5–2.0 parts by weight of chain transfer agent,

[0010] 0.1 to 1.0 parts by weight of chain extender, and

[0011] 0.1 to 0.5 parts by weight of hyperbranched macromolecules.

[0012] The modified POP polyether provided by this invention can effectively control the morphology and size of polymer particles by adding chain extenders, thereby improving the particle size distribution of polymer particles, solving the problem of unstable POP storage, and enhancing the strength of polyurethane foam.

[0013] According to embodiments of the present invention, the modified POP polyether provided above may further include the following technical features:

[0014] According to an embodiment of the present invention, the polyether has a viscosity of 150-170 mPa·s / 25℃ and a hydroxyl value of 110-112 mgKOH / g.

[0015] According to an embodiment of the present invention, the vinyl monomer is styrene (St) and acrylonitrile (AN), and the mass ratio of acrylonitrile to styrene is 7 / 3 to 3 / 7.

[0016] According to an embodiment of the present invention, the initiator is selected from at least one of benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), and dimethyl azobisisobutyrate (AIBME).

[0017] According to an embodiment of the present invention, the dispersant is a macromolecular dispersant prepared by reacting polyether polyol with maleic anhydride, and the viscosity of the dispersant is 2000-3500 mPa·s / 25℃, and the acid value is ≤0.3 mgKOH / g.

[0018] According to embodiments of the present invention, the chain transfer agent includes at least one of n-dodecyl mercaptan, tert-dodecyl mercaptan, isopropanol, and 2,4-diphenyl-4-methyl-1-pentene (AMSD).

[0019] According to embodiments of the present invention, the chain extender includes one of ethylene glycol dimethacrylate, diallyl phthalate, diallyl maleate, trimethylolpropane triacrylate, and triallyl isocyanurate.

[0020] According to an embodiment of the present invention, the hyperbranched macromolecule is a third-generation hyperbranched macromolecule (bis-MPA Hydroxyl Dendron, Carboxyl Core, G3) modified with hydroxyl groups as the core of dihydroxymethyl acrylate. This hyperbranched macromolecule can be purchased from Xi'an Qiyue Biotechnology Co., Ltd.

[0021] A second aspect of the present invention provides a method for preparing the modified POP polyether described in the first aspect, which is prepared in one step. According to a specific embodiment, the method includes: weighing polyether, initiator, styrene, acrylonitrile, dispersant, chain extender, chain transfer agent, and hyperbranched macromolecules in proportion and mixing them; heating to 75–90°C under an inert atmosphere; reacting at a constant temperature for 7–10 hours; and stirring at a speed of 300–500 rpm.

[0022] A third aspect of the present invention provides a polyurethane foam material comprising the following raw materials in parts by weight:

[0023] 100 parts of modified POP polyether

[0024] 30-50 parts isocyanate,

[0025] 1-5 parts of catalyst

[0026] 1 to 5 parts water.

[0027] The modified POP polyether is the modified POP polyether described in the first aspect of the present invention or the modified POP polyether obtained by the preparation method described in the second aspect of the present invention. According to embodiments of the present invention, the isocyanate includes one of diphenylmethane diisocyanate (MDI) and hexamethylene diisocyanate (TDI).

[0028] According to an embodiment of the present invention, the catalyst includes one of dibutyltin dilaurate and NIAX catalyst.

[0029] A fourth aspect of the present invention provides a method for preparing the polyurethane foam material described in the third aspect above, comprising:

[0030] The modified POP polyether and catalyst were mixed evenly, then isocyanate was added and mixed, water was added and stirred evenly, and then cured.

[0031] The beneficial effects achieved by this invention are at least as follows:

[0032] The modified POP polyether provided by this invention has a uniform particle size distribution. For example, the PDI value is very low, even less than 0.3. Therefore, it has good storage stability, and the polyurethane foam material obtained using this polyether has high tensile and compressive strength. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] This invention provides a modified POP polyether, synthesized from the following raw materials by weight: 40-70 parts by weight of polyether, 20-50 parts by weight of vinyl monomer, 0.1-1.0 parts by weight of initiator, 1.0-5.0 parts by weight of dispersant, 0.5-2.0 parts by weight of chain transfer agent, 0.1-1.0 parts by weight of chain extender, and 0.1-0.5 parts by weight of hyperbranched macromolecule.

[0035] The vinyl monomers mentioned include styrene (St) and acrylonitrile (AN). According to a specific embodiment, the mass ratio of acrylonitrile to styrene is 3:7 to 7:3; according to a preferred embodiment, the mass ratio of acrylonitrile to styrene is 1:2.

[0036] According to a preferred embodiment, the provided modified POP polyether is synthesized from the following raw materials by weight: 50-60 parts by weight of polyether, 35-45 parts by weight of styrene, 15-25 parts by weight of acrylonitrile, 0.3-0.8 parts by weight of initiator, 2-4 parts by weight of dispersant, 1-1.5 parts by weight of chain transfer agent, 0.1-0.5 parts by weight of chain extender, and 0.1-0.5 parts by weight of hyperbranched macromolecule. According to a more preferred embodiment, the chain extender is 0.1-0.3 parts by weight.

[0037] The chain extenders mentioned include, but are not limited to, ethylene glycol dimethacrylate, diallyl phthalate, diallyl maleate, trimethylolpropane triacrylate, and triallyl isocyanurate. According to a preferred embodiment, the chain extender is ethylene glycol dimethacrylate. The modified POP polyethers provided thus include those synthesized from several different chain extenders or from chain extenders of varying amounts. These modified POP polyethers exhibit some differences in properties. In particular, when ethylene glycol dimethacrylate is used as the chain extender, the prepared modified POP polyether has a low PDI index, and the resulting polyurethane foam material has high strength.

[0038] The polyether used has a viscosity of 150–170 mPa·s / 25℃ and a hydroxyl value of 110–112 mgKOH / g. The polyether can be commercially available or prepared in-house. According to the specific implementation method, it was purchased from Shandong Lanxing Dongda Co., Ltd.

[0039] The initiator includes, but is not limited to, benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), dimethyl azobisisobutyrate (AIBME), etc., and according to a preferred embodiment, the initiator is BPO.

[0040] The dispersant is a macromolecular dispersant prepared by reacting polyether polyol with maleic anhydride. According to a preferred embodiment, the dispersant is BDF-4, purchased from Jiangsu Bade Polyurethane Co., Ltd., with a viscosity of 2000-3500 mPa·s / 25℃ and an acid value ≤0.3 mgKOH / g.

[0041] The modified POP polyether provided can regulate the chain transfer reaction during the polymerization process by adding a chain transfer agent, thereby affecting the molecular weight, molecular weight distribution, and polymerization rate of the modified POP polyether. If the amount of chain transfer agent added is too low, its regulating effect is insufficient; however, if the amount of chain transfer agent added is too high, it will lead to excessively high system viscosity, or even agglomeration. The chain transfer agents used include, but are not limited to, n-dodecyl mercaptan, tert-dodecyl mercaptan, isopropanol, and 2,4-diphenyl-4-methyl-1-pentene (AMSD). According to a preferred embodiment, the chain transfer agent is AMSD.

[0042] The hyperbranched macromolecules used are commercially available, namely "bis-MPA Hydroxyl Dendron, Carboxyl Core, G3 hydroxyl core dihydroxymethyl acrylate hydroxyl-modified third-generation hyperbranched macromolecule" produced and sold by Xi'an Qiyue Biotechnology Co., Ltd.

[0043] This invention provides a method for preparing modified POP polyether, which is obtained by a one-step method and adopts the following steps: weigh polyether, initiator, vinyl monomer, dispersant, chain extender, chain transfer agent and hyperbranched macromolecule in proportion and mix them evenly, heat to 75-90°C by purging with N2, react at a constant temperature for 7-10 hours, and stir at a stirring speed of 300-500 rpm.

[0044] The modified POP polyether method provided by this invention involves emulsion polymerization with polyether as the continuous phase and vinyl monomer as the dispersed phase. A chain extender is added to the dispersed phase to participate in the polymerization. At the same time, hyperbranched macromolecules with multiple hydroxyl groups are added to enhance the compatibility between the dispersed phase and the continuous phase and improve the stability of the system. The resulting modified POP polyether can be used as a polyurethane foaming material to enhance the strength of polyurethane foam.

[0045] The modified POP polyether provided by this invention has a high vinyl monomer conversion rate and good stability. The prepared product does not require separation and purification and can be directly used in polyurethane foam materials, resulting in polyurethane foam materials with good performance. The provided modified POP polyether can be used to prepare polyurethane foam materials, and is obtained from the following raw materials: 100 parts modified POP polyether, 30-50 parts isocyanate, 1-5 parts catalyst, and 1-5 parts water.

[0046] The isocyanate includes, but is not limited to, hexamethylene diisocyanate (MDI) and diphenylmethane diisocyanate (TDI). According to a preferred embodiment, the isocyanate is MDI.

[0047] The catalyst is one of dibutyltin dilaurate and NIAX catalyst, and according to the preferred embodiment, it is NIAX catalyst.

[0048] According to a specific implementation method, the preparation of foamed polyurethane material involves the following steps:

[0049] Weigh out the POP polyether, isocyanate, and catalyst according to the formula ratio. First, mix the polyether and catalyst evenly, then add the isocyanate, and finally add water and mix quickly and evenly. Pour into a mold and cure in a 100℃ oven for 2.5 hours.

[0050] The technical solution of the present invention will be described below through specific embodiments. It should be noted that these embodiments are only used to facilitate understanding by those skilled in the art and should not be regarded as a limitation on the scope of protection of the present invention. Unless otherwise stated, the reagents used in the embodiments and comparative examples are all commercially available.

[0051] The manufacturers of each raw material are as follows:

[0052] Polyether, manufacturer: Shandong Lanxing Dongda Co., Ltd.;

[0053] Styrene, manufacturer: Shanghai McLean Biochemical Technology Co., Ltd.;

[0054] Acrylonitrile, manufacturer: Shanghai Maclean Biochemical Technology Co., Ltd.;

[0055] Benzoyl peroxide, manufacturer: Shanghai Maclean Biochemical Technology Co., Ltd.;

[0056] Dispersant BDF-4, manufacturer: Jiangsu Bader Polyurethane Co., Ltd.;

[0057] 2,4-Diphenyl-4-methyl-1-pentene, Manufacturer: Shanghai Maclean Biochemical Technology Co., Ltd.

[0058] diallyl phthalate, manufacturer: Shanghai Maclean Biochemical Technology Co., Ltd.;

[0059] diallyl maleate, manufacturer: Aladdin Reagent (Shanghai) Co., Ltd.;

[0060] Ethylene glycol dimethacrylate, manufacturer: Aladdin Reagent (Shanghai) Co., Ltd.;

[0061] Hyperbranched macromolecules, manufacturer: Xi'an Qiyue Biotechnology Co., Ltd.

[0062] MDI, Manufacturer: Wanhua Chemical Group Co., Ltd.;

[0063] NIAX catalyst, manufacturer: Shanghai Qiguang Industry & Trade Co., Ltd.

[0064] Example 1

[0065] Example 1: A modified POP polyether was prepared by the following method:

[0066] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, 0.12g of chain extender diallyl phthalate, and 0.6g of hyperbranched macromolecules and add them to a three-necked flask. Before the reaction, purge with N2, start stirring, set the stirring speed to 300r / min, heat to 80℃, and react for 10 hours to obtain the modified POP polyether product. The solid content of the product after the reaction is completed is 48.1%.

[0067] The modified POP polyether was used to prepare foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5h to obtain foamed polyurethane material. The tensile strength and compressive strength of the material were measured.

[0068] Example 2

[0069] Example 2: A modified POP polyether was prepared by the following method:

[0070] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, 0.12g of chain extender diallyl maleate, and 0.6g of hyperbranched macromolecules and add them to a three-necked flask. Before the reaction, purge with N2, start stirring, set the stirring speed to 300r / min, raise the temperature to 80℃, and react for 10 hours to obtain the modified POP polyether product. The solid content of the product after the reaction is completed is 48.2%.

[0071] The modified POP polyether was used to prepare foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5h to obtain foamed polyurethane material. The tensile strength and compressive strength of the material were measured.

[0072] Example 3

[0073] Example 3: A modified POP polyether was prepared by the following method:

[0074] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, 0.12g of chain extender ethylene glycol dimethacrylate, and 0.6g of hyperbranched macromolecules and add them to a three-necked flask. Before the reaction, purge with N2, start stirring, set the stirring speed to 300r / min, heat to 80℃, and react for 10 hours to obtain modified POP polyether. The solid content of the product after the reaction is completed is 48.5%.

[0075] The modified POP polyether was used to prepare the foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5 hours to obtain the foamed polyurethane material. The tensile strength and compressive strength of the material were then measured.

[0076] Example 4

[0077] Example 4: A modified POP polyether was prepared by the following method:

[0078] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, 0.09g of chain extender ethylene glycol dimethacrylate, and 0.6g of hyperbranched macromolecules and add them to a three-necked flask. Before the reaction, purge with N2, start stirring, set the stirring speed to 300r / min, raise the temperature to 80℃, and react for 10 hours to obtain modified POP polyether. The solid content of the product after the reaction is completed is 48.6%.

[0079] The modified POP polyether was used to prepare foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5h to obtain foamed polyurethane material. The tensile strength and compressive strength of the material were measured.

[0080] Example 5

[0081] Example 5: A modified POP polyether was prepared by the following method:

[0082] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, 0.15g of chain extender ethylene glycol dimethacrylate, and 0.6g of hyperbranched macromolecules and add them to a three-necked flask. Before the reaction, purge with N2, start stirring, set the stirring speed to 300r / min, heat to 80℃, and react for 10 hours to obtain the modified POP polyether product. The solid content of the product after the reaction is completed is 48.5%.

[0083] The modified POP polyether was used to prepare foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, and place them in an oven at 100℃ for curing for 2.5h to obtain foamed polyurethane material. The tensile strength and compressive strength of the material were then measured.

[0084] Example 6

[0085] Example 6: A modified POP polyether was prepared by the following method:

[0086] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, 0.18g of chain extender ethylene glycol dimethacrylate, and 0.6g of hyperbranched macromolecules and add them to a three-necked flask. Before the reaction, purge with N2, start stirring, set the stirring speed to 300r / min, heat to 80℃, and react for 10 hours to obtain the modified POP polyether product. The solid content of the product after the reaction is completed is 48.3%.

[0087] The modified POP polyether was used to prepare foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5h to obtain foamed polyurethane material. The tensile strength and compressive strength of the material were measured.

[0088] Example 7

[0089] Example 7: A modified POP polyether was prepared by the following method:

[0090] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, 0.12g of chain extender ethylene glycol dimethacrylate, and 0.6g of hyperbranched macromolecules and add them to a three-necked flask. Before the reaction, purge with N2, start stirring, set the stirring speed to 400r / min, heat to 80℃, and react for 10 hours to obtain the modified POP polyether product. The solid content of the product after the reaction is completed is 48.7%.

[0091] The modified POP polyether was used to prepare foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5h to obtain foamed polyurethane material. The tensile strength and compressive strength of the material were measured.

[0092] Example 8

[0093] Example 8: A modified POP polyether was prepared by the following method:

[0094] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, 0.12g of chain extender ethylene glycol dimethacrylate, and 0.6g of hyperbranched macromolecules and add them to a three-necked flask. Before the reaction, purge with N2, start stirring, set the stirring speed to 300r / min, heat to 95℃, and react for 10 hours to obtain the modified POP polyether product. The solid content of the product after the reaction is completed is 48.1%.

[0095] The modified POP polyether was used to prepare foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5h to obtain foamed polyurethane material. The tensile strength and compressive strength of the material were measured.

[0096] Example 9

[0097] Example 9: A modified POP polyether was prepared by the following method:

[0098] Weigh out 60g of polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, 0.12g of chain extender ethylene glycol dimethacrylate, and 0.6g of hyperbranched macromolecules and add them to a three-necked flask. Before the reaction, purge with N2, start stirring, set the stirring speed to 300r / min, heat to 80℃, and react for 7 hours to obtain the POP product. The solid content of the product after the reaction is completed is 48.5%.

[0099] The POP polyether was used to prepare the foamed polyurethane material by the following method: weigh POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5h to obtain the foamed polyurethane material. The tensile strength and compressive strength were then measured.

[0100] Comparative Example 1

[0101] Comparative Example 1 prepared a modified POP polyether by the following method:

[0102] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, and 0.6g of hyperbranched macromolecules. Add them to a three-necked flask, purge with N2 before reaction, start stirring, set the stirring speed to 300r / min, heat to 80℃, and react for 10 hours to obtain the modified POP polyether product. The solid content of the product after the reaction is completed is 48.6%.

[0103] The modified POP polyether was used to prepare foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5h to obtain foamed polyurethane material. The tensile strength and compressive strength of the material were measured.

[0104] Comparative Example 2

[0105] Comparative Example 2 prepared a modified POP polyether by the following method:

[0106] Weigh out 60g of raw material polyether, 40g of styrene, 20g of acrylonitrile, 0.6g of benzoyl peroxide, 3g of dispersant BDF-4, 1.2g of chain transfer agent 2,4-diphenyl-4-methyl-1-pentene, and 0.6g of hyperbranched macromolecules. Add them to a three-necked flask, purge with N2 before reaction, start stirring, set the stirring speed to 400r / min, heat to 80℃, and react for 10 hours to obtain the modified POP polyether product. The solid content of the product after the reaction is completed is 48.9%.

[0107] The modified POP polyether was used to prepare foamed polyurethane material by the following method: weigh the modified POP polyether, MDI, catalyst and water, mix them evenly, pour them into a mold, and place them in an oven at 100℃ for curing for 2.5h to obtain foamed polyurethane material. The tensile strength and compressive strength of the material were measured.

[0108] The tensile strength was tested in accordance with the national standard GB / T 1040.1--2018;

[0109] The compressive strength was tested in accordance with the national standard GB / T 8813--2020.

[0110] The test results of Examples 1-9 and Comparative Examples 1-2 are shown in Table 1.

[0111] Table 1 Test Results

[0112]

[0113] It is evident from the above embodiments that the tensile and compressive strengths of the prepared polyurethane materials are higher than those of Comparative Examples 1 and 2 (which do not contain chain extenders). In particular, when ethylene glycol dimethacrylate is used as a chain extender in the embodiments, the tensile and compressive strengths of the prepared polyurethane materials are even higher, and the polydispersity index is even lower, for example, less than 0.3.

[0114] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "detailed description," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0115] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A modified POP polyether, characterized in that, It is prepared from raw materials comprising the following weights: 40-70 parts by weight of polyether, 20-50 parts by weight of vinyl monomer, 0.1~1.0 parts by weight of initiator, 1.0~5.0 parts by weight of dispersant, 0.5~2.0 parts by weight of chain transfer agent, 0.1 to 1.0 parts by weight of chain extender, and 0.1 to 0.5 parts by weight of hyperbranched macromolecules.

2. The modified POP polyether according to claim 1, characterized in that, The polyether has a viscosity of 150~170 mPa·s / 25℃ and a hydroxyl value of 110~120 mgKOH / g.

3. The modified POP polyether according to claim 1, characterized in that, The vinyl monomers include styrene (St) and acrylonitrile (AN), and the mass ratio of acrylonitrile to styrene is 3 / 7 to 7 / 3; The initiator is selected from at least one of benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), and dimethyl azobisisobutyrate (AIBME).

4. The modified POP polyether according to claim 1, characterized in that, The dispersant is a macromolecular dispersant prepared by reacting polyether polyol with maleic anhydride. The viscosity of the dispersant is 2000~3500mPa·s / 25℃, and the acid value is ≤0.3mgKOH / g.

5. The modified POP polyether according to claim 1, characterized in that, The chain transfer agent includes at least one of n-dodecyl mercaptan, tert-dodecyl mercaptan, isopropanol, and 2,4-diphenyl-4-methyl-1-pentene.

6. The modified POP polyether according to claim 1, characterized in that, The chain extender includes at least one of ethylene glycol dimethacrylate, diallyl phthalate, diallyl maleate, trimethylolpropane triacrylate, and triallyl isocyanurate.

7. The modified POP polyether according to claim 1, characterized in that, The hyperbranched macromolecule is a third-generation hyperbranched macromolecule with hydroxyl as the core and modified with dihydroxymethyl acrylate.

8. A method for preparing the modified POP polyether according to any one of claims 1 to 7, characterized in that, include: Weigh out the polyether, initiator, styrene, acrylonitrile, dispersant, chain extender, chain transfer agent and hyperbranched macromolecules in proportion and mix them. Heat the mixture to 75~90℃ under an inert atmosphere and stir it to a constant temperature for 7~10 hours, with a stirring speed of 300~500 rpm.

9. A polyurethane foam material, characterized in that, The raw materials include the following parts by weight: 100 parts of modified POP polyether, 30-50 parts of isocyanate, 1-5 parts of catalyst, and 1-5 parts of water, wherein the modified POP polyether is the modified POP polyether according to any one of claims 1-7 or the modified POP polyether obtained by the preparation method according to claim 8. The isocyanate is selected from at least one of diphenylmethane diisocyanate (MDI) and hexamethylene diisocyanate (TDI); The catalyst is selected from at least one of dibutyltin dilaurate and NIAX catalyst.

10. The method for preparing the polyurethane foam material according to claim 9, characterized in that, include: The modified POP polyether and catalyst are mixed evenly, then mixed with isocyanate, water is added and stirred evenly, and then cured to obtain the polyurethane foam material.

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