阅读说明：本技术 一种高硬度微发泡材料及其制备方法 (High-hardness micro-foaming material and preparation method thereof ) 是由 黄国正 关椿樑 于 2021-08-17 设计创作，主要内容包括：本发明属于发光材料及其制备技术领域,具体涉及一种高硬度微发泡材料及其制备方法,本发明的高硬度微发泡材料包括聚甲基丙烯酸甲酯、聚苯乙烯树脂、相容剂、发泡剂、气相二氧化硅、玄武岩纤维、交联剂和交联剂助剂,其中气相二氧化硅在发泡材料的配方体系中起到提高耐侯性、抗划伤性的作用,同时还可提高微发泡材料与基材之间的结合强度,玄武岩纤维的添加可以大大增加微发泡材料的硬度。(The invention belongs to the technical field of luminescent materials and preparation thereof, and particularly relates to a high-hardness micro-foaming material and a preparation method thereof.)

1. A high-hardness micro-foaming material is characterized in that: according to parts by weight, the high-hardness micro-foaming material comprises 30-35 parts by weight of polymethyl methacrylate, 48-59 parts by weight of polystyrene resin, 1-2 parts by weight of compatilizer, 1-5 parts by weight of foaming agent, 0.5-1 part by weight of fumed silica, 1-10 parts by weight of basalt fiber, 0.4-0.7 part by weight of cross-linking agent and 0.5-1 part by weight of cross-linking agent auxiliary agent.

2. A high durometer microfoamed material according to claim 1, wherein: the weight average molecular weight of the polymethyl methacrylate is 5000-.

3. A high durometer microfoamed material according to claim 1, wherein: the melt index of the polystyrene resin is 1-50g/10 min.

4. A high durometer microfoamed material according to claim 1, wherein: the compatilizer is at least one of styrene-methacrylic acid, styrene-maleic anhydride copolymer and styrene-maleic anhydride copolymer.

5. A high durometer microfoamed material according to claim 1, wherein: the foaming agent is at least one of water, dichlorofluoroethane, cyclopentane, pentafluoropropane, dichloromethane and 1, 1-difluoroethane.

6. A high durometer microfoamed material according to claim 1, wherein: the particle size of the fumed silica is 30-60 nm.

7. A high durometer microfoamed material according to claim 1, wherein: the diameter of the basalt fiber is 12-15 μm.

8. A high durometer microfoamed material according to claim 1, wherein: the cross-linking agent is at least one of high methylated amino resin, methyl etherified high imino melamine resin and butylated melamine resin.

9. A high durometer microfoamed material according to claim 1, wherein: the cross-linking agent auxiliary agent is at least one of pentaerythritol triacrylate, triallyl isocyanurate, triallyl cyanurate and trimethylolpropane trimethacrylate.

10. A preparation method of a high-hardness micro-foaming material is characterized by comprising the following steps: the method comprises the following steps:

step one, putting polymethyl methacrylate, polystyrene resin and a compatilizer into a high-speed mixer according to the weight ratio, and mixing for 4-6min to obtain a uniform mixture of the components;

adding the component mixture into a double-screw extruder from a hopper, adding fumed silica, basalt fibers, a cross-linking agent and a cross-linking agent auxiliary agent into the double-screw extruder from a side feeding port, and performing extrusion granulation to obtain a composite material;

step three, putting the composite material and the foaming agent into a mixer in proportion to be mixed to obtain a mixture of the composite material and the foaming agent;

and step four, adding the mixture into an injection molding machine, and performing injection molding to obtain the high-hardness micro-foaming material, wherein the charging barrel temperature of the injection molding machine is 180-.

Technical Field

The invention belongs to the technical field of luminescent materials and preparation thereof, and particularly relates to a high-hardness micro-foaming material and a preparation method thereof.

Background

The microcellular foamed material refers to a polymer material as a matrix, which contains a porous polymer material having a cell size of less than one micron to several tens of microns. Foams produced by conventional physical or chemical foaming processes are generally outside this category because of their relatively large pore size, and microcellular foams are known as microcellular foams because they have much smaller cells and much higher cell densities than conventional millimeter-sized cells.

The unique gas-solid two-phase structure of the micro-foaming material endows the micro-foaming material with better performances of toughness, heat insulation, sound insulation and the like, so the micro-foaming material can be widely applied to the fields of food packaging, automobile industry, aerospace, heat insulation, sound insulation and the like.

In the prior art, the hardness of the micro-foaming material is not enough, and the micro-foaming material cannot meet all application places.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a high-hardness micro-foaming material and a preparation method thereof. The invention specifically comprises the following contents:

the first purpose of the invention is to provide a high-hardness micro-foaming material, which is characterized in that: according to parts by weight, the high-hardness micro-foaming material comprises 30-35 parts by weight of polymethyl methacrylate, 48-59 parts by weight of polystyrene resin, 1-2 parts by weight of compatilizer, 1-5 parts by weight of foaming agent, 0.5-1 part by weight of fumed silica, 1-10 parts by weight of basalt fiber, 0.4-0.7 part by weight of cross-linking agent and 0.5-1 part by weight of cross-linking agent auxiliary agent.

Further, the weight average molecular weight of the polymethyl methacrylate in the formula system of the high-hardness micro-foaming material is 5000-200000.

Furthermore, the melt index of the polystyrene resin in the formula system of the high-hardness micro-foaming material is 1-50g/10 min.

Furthermore, the compatilizer in the formula system of the high-hardness micro-foaming material is at least one of styrene-methacrylic acid, styrene-maleic anhydride copolymer and styrene-maleic anhydride copolymer.

Further, the foaming agent in the formulation system of the high-hardness micro-foaming material of the invention is at least one of water, dichlorofluoroethane, cyclopentane, pentafluoropropane, dichloromethane and 1, 1-difluoroethane.

Furthermore, the particle size of the fumed silica in the formula system of the high-hardness micro-foaming material is 30-60 nm.

Furthermore, the diameter of the basalt fiber in the high-hardness micro-foaming material formula system is 12-15 μm.

Furthermore, the cross-linking agent in the formula system of the high-hardness micro-foaming material is at least one of high methylated amino resin, methyl etherified high imino melamine resin and butylated melamine resin.

Furthermore, in the formula system of the high-hardness micro-foaming material, the cross-linking agent assistant is at least one of pentaerythritol triacrylate, triallyl isocyanurate, triallyl cyanurate and trimethylolpropane trimethacrylate.

The second purpose of the invention is to provide a preparation method of a high-hardness micro-foaming material, which has the technical points that: the method comprises the following steps:

step one, putting polymethyl methacrylate, polystyrene resin and a compatilizer into a high-speed mixer according to the weight ratio, and mixing for 4-6min to obtain a uniform mixture of the components;

adding the component mixture into a double-screw extruder from a hopper, adding fumed silica, basalt fibers, a cross-linking agent and a cross-linking agent auxiliary agent into the double-screw extruder from a side feeding port, and performing extrusion granulation to obtain a composite material;

step three, putting the composite material and the foaming agent into a mixer in proportion to be mixed to obtain a mixture of the composite material and the foaming agent;

and step four, adding the mixture into an injection molding machine, and performing injection molding to obtain the high-hardness micro-foaming material, wherein the charging barrel temperature of the injection molding machine is 180-.

Compared with the prior art, the high-hardness micro-foaming material and the preparation method thereof have the beneficial effects that:

the high-hardness micro-foaming material comprises polymethyl methacrylate, polystyrene resin, a compatilizer, a foaming agent, fumed silica, basalt fiber, a cross-linking agent and a cross-linking agent auxiliary agent, wherein the fumed silica plays a role in improving weather resistance and scratch resistance in a formula system of the foaming material, the bonding strength between the micro-foaming material and a base material can be improved, and the hardness of the micro-foaming material can be greatly improved by adding the basalt fiber.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer.

Example 1

A high-hardness micro-foamed material of the present example comprised 32.5kg of polymethyl methacrylate, 50kg of polystyrene resin, 1.5kg of compatibilizer, 3kg of foaming agent, 0.75kg of fumed silica, 5.5kg of basalt fiber, 0.55kg of crosslinking agent, and 0.75kg of crosslinking agent aid.

Wherein the weight average molecular weight of the polymethyl methacrylate is 100000.

Wherein, the melt index of the polystyrene resin in the formula system of the high-hardness micro-foaming material is 25g/10 min.

Wherein, the compatilizer in the formula system of the high-hardness micro-foaming material is styrene-methacrylic acid.

Wherein, the foaming agent in the formula system of the high-hardness micro-foaming material is water.

Wherein, the grain diameter of the fumed silica in the formula system of the high-hardness micro-foaming material is 45 nm.

Wherein, the diameter of the basalt fiber in the formula system of the high-hardness micro-foaming material is 14 μm.

Wherein, the cross-linking agent in the formula system of the high-hardness micro-foaming material is high methylated amino resin.

Wherein, the cross-linking agent assistant in the formula system of the high-hardness micro-foaming material is pentaerythritol triacrylate.

According to the above formula, the preparation method of the high-hardness micro-foaming material of the embodiment comprises the following steps:

step one, putting polymethyl methacrylate, polystyrene resin and a compatilizer into a high-speed mixer according to the weight proportion, and mixing for 5min to obtain a uniform mixture of the components;

adding the component mixture into a double-screw extruder from a hopper, adding fumed silica, basalt fibers, a cross-linking agent and a cross-linking agent auxiliary agent into the double-screw extruder from a side feeding port, and performing extrusion granulation to obtain a composite material;

step three, putting the composite material and the foaming agent into a mixer in proportion to be mixed to obtain a mixture of the composite material and the foaming agent;

and step four, adding the mixture into an injection molding machine, and performing injection molding to obtain the high-hardness micro-foaming material, wherein the charging barrel temperature of the injection molding machine is 230 ℃, the injection pressure is 70MPa, the injection speed is 65mm/s, and the cooling time is 20 s.

Example 2

A high-hardness micro-foamed material of the present example comprised 30kg of polymethyl methacrylate, 48kg of polystyrene resin, 1kg of compatibilizer, 1kg of foaming agent, 0.5kg of fumed silica, 1kg of basalt fiber, 0.4kg of crosslinking agent, and 0.5kg of crosslinking agent aid.

Wherein the weight average molecular weight of the polymethyl methacrylate is 5000.

Wherein, the melt index of the polystyrene resin in the formula system of the high-hardness micro-foaming material is 1g/10 min.

Wherein, the compatilizer in the formula system of the high-hardness micro-foaming material is styrene-maleic anhydride copolymer.

Wherein, the foaming agent in the formula system of the high-hardness micro-foaming material is dichlorofluoroethane.

Wherein, the grain diameter of the fumed silica in the formula system of the high-hardness micro-foaming material is 30 nm.

Wherein, the diameter of the basalt fiber in the formula system of the high-hardness micro-foaming material is 12 μm.

Wherein, the cross-linking agent in the formula system of the high-hardness micro-foaming material is methylated amino resin.

Wherein, the cross-linking agent assistant in the formula system of the high-hardness micro-foaming material is triallyl isocyanurate.

According to the above formula, the preparation method of the high-hardness micro-foaming material of the embodiment comprises the following steps:

step one, putting polymethyl methacrylate, polystyrene resin and a compatilizer into a high-speed mixer according to the weight ratio, and mixing for 4min to obtain a uniform mixture of the components;

adding the component mixture into a double-screw extruder from a hopper, adding fumed silica, basalt fibers, a cross-linking agent and a cross-linking agent auxiliary agent into the double-screw extruder from a side feeding port, and performing extrusion granulation to obtain a composite material;

step three, putting the composite material and the foaming agent into a mixer in proportion to be mixed to obtain a mixture of the composite material and the foaming agent;

and step four, adding the mixture into an injection molding machine, and performing injection molding to obtain the high-hardness micro-foaming material, wherein the temperature of a charging barrel of the injection molding machine is 180 ℃, the injection pressure is 60MPa, the injection speed is 50mm/s, and the cooling time is 10 s.

Example 3

A high-hardness micro-foamed material of the present example comprised 35kg of polymethyl methacrylate, 59kg of polystyrene resin, 2kg of a compatibilizer, 5kg of a foaming agent, 1kg of fumed silica, 10kg of basalt fiber, 0.7kg of a crosslinking agent, and 1kg of a crosslinking agent aid.

Wherein the weight average molecular weight of the polymethyl methacrylate is 200000.

Wherein, the melt index of the polystyrene resin in the formula system of the high-hardness micro-foaming material is 50g/10 min.

Wherein, the compatilizer in the formula system of the high-hardness micro-foaming material is styrene-maleic anhydride copolymer.

Wherein, the foaming agent in the formula system of the high-hardness micro-foaming material is cyclopentane.

Wherein, the grain diameter of the fumed silica in the formula system of the high-hardness micro-foaming material is 60 nm.

Wherein, the diameter of the basalt fiber in the formula system of the high-hardness micro-foaming material is 15 μm.

Wherein, the cross-linking agent in the formula system of the high-hardness micro-foaming material is methyl etherified high imino group melamine resin.

Wherein, the cross-linking agent assistant in the formula system of the high-hardness micro-foaming material is triallyl cyanurate.

According to the above formula, the preparation method of the high-hardness micro-foaming material of the embodiment comprises the following steps:

step one, putting polymethyl methacrylate, polystyrene resin and a compatilizer into a high-speed mixer according to the weight proportion, and mixing for 6min to obtain a uniform mixture of the components;

adding the component mixture into a double-screw extruder from a hopper, adding fumed silica, basalt fibers, a cross-linking agent and a cross-linking agent auxiliary agent into the double-screw extruder from a side feeding port, and performing extrusion granulation to obtain a composite material;

step three, putting the composite material and the foaming agent into a mixer in proportion to be mixed to obtain a mixture of the composite material and the foaming agent;

and step four, adding the mixture into an injection molding machine, and performing injection molding to obtain the high-hardness micro-foaming material, wherein the charging barrel temperature of the injection molding machine is 280 ℃, the injection pressure is 80MPa, the injection speed is 80mm/s, and the cooling time is 30 s.

Test examples

The performance tests of the commercially available microcellular foams (comparative examples) of examples 1 to 3 and the prepared high hardness microcellular foams were carried out, and the purchased microcellular foams were purchased from Kai Huari engineering materials Co., Ltd, Shandong, and the specific results are shown in Table 1:

TABLE 1

While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.