CN109849247B - Fixing structure on surface of rotational molding polyolefin product and preparation process thereof - Google Patents
Fixing structure on surface of rotational molding polyolefin product and preparation process thereof Download PDFInfo
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- CN109849247B CN109849247B CN201910079502.0A CN201910079502A CN109849247B CN 109849247 B CN109849247 B CN 109849247B CN 201910079502 A CN201910079502 A CN 201910079502A CN 109849247 B CN109849247 B CN 109849247B
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Abstract
The invention relates to a fixed structure on the surface of a rotational molding polyolefin part, which comprises a fixed micro-nano layer which is formed in the hollow part in advance and has good compatibility with the polyolefin rotational molding wall of the hollow part, wherein the fixed micro-nano layer and a subsequent filling coating layer form a stable multilayer structure. The invention has the advantages of simple process and easy operation, and can obviously improve the structural stability, the thermal stability and the impact resistance of the filling layer or the coating layer.
Description
Technical Field
The invention relates to a fixed structure on the surface of a rotational molding polyolefin product and a preparation process thereof, belonging to the technical field of material modification and polymer processing processes.
Background
In the rolling forming process, the formed hollow part has poor compatibility with materials such as subsequent filling and coating due to the polyolefin wall surface, and the polyolefin wall also has the characteristics of high smoothness, low friction resistance and the like. The traditional process at present is to directly foam a hollow part made by rotational molding, which causes large temperature difference between the inside and the outside of the hollow part, and causes deformation in a short time after being influenced by factors such as ultraviolet irradiation, impact and the like, and finally causes the hollow part to be unusable. In addition, the hollow part can be manufactured by directly adopting methods such as solvent corrosion, machine internal polishing and the like, and the method has the problems that the product quality is damaged to a certain extent due to inherent process defects of the processes, the process conditions are difficult to control, the subsequent foaming and inner wall compatibility effect is poor and the like. Therefore, it is necessary to perform surface pretreatment on the polyolefin wall in advance to greatly reduce the production time and the degree of damage in the product pretreatment process and improve the product quality.
Disclosure of Invention
The invention aims to: aiming at the defects in the prior art, the fixing structure on the surface of the rotational molding polyolefin part and the preparation process thereof are provided, the fixing structure can be mutually interpenetrated with the subsequent filling coating layer of the polyolefin wall of the hollow part to form an interlocking network under a smaller scale, and then a stable, high-temperature-resistant and impact-resistant filling coating layer is formed in a rotational molding cavity, so that the production time of the product and the damage degree of the product pretreatment process are greatly reduced, and the product quality is improved.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the utility model provides a fixed knot on rotational moulding polyolefin finished piece surface constructs, includes that the one deck that forms in hollow finished piece inside in advance and hollow finished piece polyolefin rotational moulding wall compatible good fixed receive layer a little, fixed receive layer a little and follow-up filling coating layer formation stable multilayer structure.
The fixed micro-nano layer is used for forming a stable multilayer structure in the film coating and foaming processes of the surface of the polyolefin rotational molding wall, so that a stable, high-temperature-resistant and impact-resistant filling coating layer can be formed in a rotational molding cavity.
Further, the fixed micro-nano layer is composed of a group of fixed columns with different sizes, the average height of the group of fixed columns is 1 mm, and the fixed columns and the subsequent filling coating layer are mutually interpenetrated to form a network interlocking structure under a smaller scale.
The invention also provides a preparation process of the fixed structure on the surface of the rotational molding polyolefin part, which comprises the following steps:
firstly, taking 99.5-99.8% of high molecular weight polyethylene or High Density Polyethylene (HDPE) according to the mass percentage, grinding into powder to ensure that the particle size is 80 nanometers-100 micrometers, wherein the weight of the powder with the particle size of 60 micrometers accounts for more than 60% of the total weight of the powder;
secondly, taking 0.2-0.5% of low-melting-point polyester according to mass percentage, and then blending the low-melting-point polyester and high-molecular-weight polyethylene powder or high-density polyethylene powder to obtain a pretreatment material of the polyolefin rotational molding wall;
thirdly, taking out the molded polyethylene rotational molding shell from the rotational molding machine, putting the polyethylene rotational molding shell into a shell mold, and ensuring that the temperature of the polyethylene rotational molding shell is lower than 70 ℃;
fourthly, placing the pretreatment material into a feed inlet of a shell mold, and dispersing the pretreatment material into a polyethylene rotational molding shell by adopting a high-pressure spray gun under the pressure condition of 1 +/-0.5 MPa to form a powder particle layer which is not completely melted with the inner surface of the shell;
and fifthly, placing the shell mold into the furnace body, heating to 130-139 ℃, heating in a rotating state for no more than 2min, withdrawing the shell mold from the furnace body, and naturally cooling to room temperature to obtain the fixed structure formed on the surface of the rotational molding polyolefin product.
In a word, the hollow workpiece formed by rotational molding is withdrawn from a processing furnace body, the workpiece still has residual temperature of 120 ℃, modified high-density polyethylene (HDPE) or a blend of high-molecular-weight polyethylene and low-melting-point polyester (the melting point is about 120-160 ℃) which has good compatibility with polyolefin workpieces enters the inner wall of the workpiece through a feeding port, the workpiece is simply rolled and melted, then the workpiece is withdrawn from the furnace body and naturally cooled, and the surface fixing column which is compact and has the average thickness of 1 mm can be formed.
Further, the molecular weight of the high molecular weight polyethylene is 300-500 ten thousand, and the density of the high molecular weight polyethylene is 0.92-0.96g/m3(ii) a The softening temperature of the high molecular weight polyethylene is 85 ℃ under the pressure condition of 0.46MPa, and the melting point is 130-136 ℃.
Further, the low melting point polyester is a polyethylene nucleating agent.
Further, the polyethylene nucleating agent is hyper-form hpn-20E of Milliken company.
Further, in the fourth step, the dosage of the pretreatment material is 150g per square meter, namely 150g of pretreatment material is added into each square meter of the polyolefin rotational molding wall to be treated.
The invention has the advantages that the success of modifying the surface of the polyethylene rotational molding can be improved to 100 percent by pretreating the surface of the polyolefin rotational molding; the stability of the polyethylene rotational molding surface and the foaming and coating structure can be improved, the deformation caused by the high temperature below 70 ℃ can be effectively avoided, and the product deformation caused by external impact can be avoided; the phenomena of material deformation, defoaming and the like under the condition that the internal and external temperature difference is relaxed at 60 ℃ can be eliminated; by adopting the process, the heat insulation performance of the heat insulation equipment filled with polyurethane is improved by 400 percent; compared with the traditional method, the working procedure time is reduced by at least 80 percent; because other machines and equipment are not needed, the operation is only carried out on the basis of rotational molding, and only a simple spray gun is needed, the process is very simple and convenient, and the operation is simple; no solvent is needed, and the method is green and environment-friendly.
In a word, the process of the invention is simple and easy to operate, and can obviously improve the structural stability, the thermal stability and the impact resistance of the filling layer or the coating layer.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: 1. polyolefin rotomolding wall, 2. fixing column.
Detailed Description
The invention provides a fixed structure on the surface of a rotational molding polyolefin product, which is structurally shown in figure 1 and comprises a fixed micro-nano layer which is formed in a rotational molding refrigerator or other rotational molding hollow products in advance through a special formula, wherein the fixed micro-nano layer has good compatibility with a polyolefin rotational molding wall 1 of the hollow product, and the fixed micro-nano layer and a subsequent filling coating layer can form a stable multilayer structure. The fixed micro-nano layer is composed of a plurality of fixed columns 2 with different sizes, the average height of the group of fixed columns 2 is 1 mm, and the fixed columns 2 and the subsequent filling coating layer can be mutually interpenetrated to form a network interlocking structure under a smaller scale, so that the fixed micro-nano layer and the subsequent filling coating layer form a stable structure.
A process for the preparation of a fixing structure on the surface of a rotomoulded polyolefin article comprising the steps of:
firstly, according to mass percentTaking 99.5-99.8% of high molecular weight polyethylene or High Density Polyethylene (HDPE) and grinding into powder to ensure that the particle size is 80 nanometers-100 micrometers, wherein the weight of the powder with the particle size of 60 micrometers accounts for more than 60% of the total weight of the powder; the high molecular weight polyethylene has a molecular weight of 300-500 ten thousand and a density of 0.92-0.96g/m3(ii) a The softening temperature of the high molecular weight polyethylene is 85 ℃ under the pressure condition of 0.46MPa, and the melting point is 130-136 ℃.
Secondly, taking 0.2-0.5% of low-melting-point polyester according to mass percentage, and then blending the low-melting-point polyester and high-molecular-weight polyethylene powder or high-density polyethylene powder to obtain a pretreatment material of the polyolefin rotational molding wall; the low-melting-point polyester is a polyethylene nucleating agent, and the polyethylene nucleating agent is hyper (hpn-20E) of Milliken company.
And thirdly, taking out the molded polyethylene rotational molding shell from the rotational molding machine, putting the polyethylene rotational molding shell into a shell mold, and ensuring that the temperature of the polyethylene rotational molding shell is lower than 70 ℃.
Fourthly, placing the pretreatment material into a feed inlet of a shell mold, and dispersing the pretreatment material into a polyethylene rotational molding shell by adopting a high-pressure spray gun under the pressure condition of 1 +/-0.5 MPa to form a powder particle layer which is not completely melted with the inner surface of the shell; the dosage of the pretreatment material is 150 g/square meter, namely 150g of pretreatment material is added into each square meter of the polyolefin rotational molding wall to be treated.
And fifthly, placing the shell mold into the furnace body, heating to 130-139 ℃, heating in a rotating state for no more than 2min, withdrawing the shell mold from the furnace body, and naturally cooling to room temperature to obtain the fixed structure formed on the surface of the rotational molding polyolefin product.
Example 1
Taking 99.5% of high molecular weight polyethylene by mass percent, grinding into powder to ensure that the particle size is 80 nanometers-100 micrometers, wherein the weight of the powder with the particle size of 60 micrometers accounts for more than 60% of the total weight of the powder. And then 0.5 percent of polyethylene nucleating agent hyperformn-20E is taken according to the mass percentage, and then the polyethylene nucleating agent hyperformn-20E is blended with high molecular weight polyethylene powder to obtain the pretreatment material of the polyolefin rotational molding wall.
And taking out the molded polyethylene rotational molding shell from the rotational molding machine, putting the polyethylene rotational molding shell into a shell mold, and ensuring that the temperature of the polyethylene rotational molding shell is lower than 70 ℃. 300g of the pretreatment material is placed into a feed inlet of a shell mold, and the pretreatment material is dispersed into a polyethylene rotational molding shell under the pressure of 1MPa by using a high-pressure spray gun to form a powder particle layer which is not completely melted with the inner surface of the shell; the dosage of the pretreatment material is 150 g/square meter, namely 150g of pretreatment material is added into each square meter of the polyolefin rotational molding wall to be treated. And (3) putting the shell mold into the furnace body, heating to 130 ℃, heating for 2min in a rotating state, withdrawing the shell mold from the furnace body, and naturally cooling to room temperature to obtain the fixed structure formed on the surface of the rotational molding polyolefin product.
Example 2
Taking 99.8% of high molecular weight polyethylene by mass percent, grinding into powder to ensure that the particle size is 80 nanometers-100 micrometers, wherein the weight of the powder with the particle size of 60 micrometers accounts for more than 60% of the total weight of the powder. Taking 0.2% of polyethylene nucleating agent Hyperform hpn-20E according to mass percentage, and then blending the polyethylene nucleating agent Hyperform hpn-20E with high molecular weight polyethylene powder to obtain the pretreatment material of the polyolefin rotational molding wall.
And taking out the molded polyethylene rotational molding shell from the rotational molding machine, putting the polyethylene rotational molding shell into a shell mold, and ensuring that the temperature of the polyethylene rotational molding shell is lower than 70 ℃. The pretreatment material is put into a feed inlet of a shell die according to the quantity of 150 g/square meter, and a high-pressure spray gun is adopted to disperse the pretreatment material into a polyethylene rotational molding shell under the pressure condition of 1.5MPa to form a powder particle layer which is not completely melted with the inner surface of the shell. And (3) placing the shell mold into a furnace body, heating to 139 ℃, heating in a rotating state for less than 1min, withdrawing the shell mold from the furnace body, and naturally cooling to room temperature to obtain the fixed structure formed on the surface of the rotational molding polyolefin product.
Example 3
Taking 99.65% of High Density Polyethylene (HDPE) according to the mass percentage, grinding the HDPE into powder to ensure that the particle size of the HDPE is 80 nanometers to 100 micrometers, wherein the weight of the powder with the particle size of 60 micrometers accounts for more than 60% of the total weight of the powder. Taking 0.35% of polyethylene nucleating agent Hyperform hpn-20E according to mass percentage, and then blending the polyethylene nucleating agent Hyperform hpn-20E and high-density polyethylene powder to obtain the pretreatment material of the polyolefin rotational molding wall.
And taking out the molded polyethylene rotational molding shell from the rotational molding machine, putting the polyethylene rotational molding shell into a shell mold, and ensuring that the temperature of the polyethylene rotational molding shell is lower than 70 ℃. The pretreatment material is put into a feed inlet of a shell die according to the quantity of 150 g/square meter, and a high-pressure spray gun is adopted to disperse the pretreatment material into a polyethylene rotational molding shell under the pressure condition of 0.5MPa to form a powder particle layer which is not completely melted with the inner surface of the shell. And (3) placing the shell mold into the furnace body, heating to 135 ℃, heating for 2min in a rotating state, withdrawing the shell mold from the furnace body, and naturally cooling to room temperature to obtain the fixed structure formed on the surface of the rotational molding polyolefin product.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A process for preparing a fixing structure on the surface of a rotomoulded polyolefin article, comprising the steps of:
firstly, taking 99.5-99.8% of high molecular weight polyethylene or high density polyethylene according to the mass percentage, grinding the high molecular weight polyethylene or high density polyethylene into powder to ensure that the particle size of the high molecular weight polyethylene or high density polyethylene is 80 nanometers-100 micrometers, wherein the weight of the powder with the particle size of 60 micrometers accounts for more than 60% of the total weight of the powder;
secondly, taking 0.2-0.5% of low-melting-point polyester according to mass percentage, and then blending the low-melting-point polyester and high-molecular-weight polyethylene powder or high-density polyethylene powder to obtain a pretreatment material of the polyolefin rotational molding wall;
thirdly, taking out the molded polyethylene rotational molding shell from the rotational molding machine, putting the polyethylene rotational molding shell into a shell mold, and ensuring that the temperature of the polyethylene rotational molding shell is lower than 70 ℃;
fourthly, placing the pretreatment material into a feed inlet of a shell mold, and dispersing the pretreatment material into a polyethylene rotational molding shell under the pressure condition of 1 +/-0.5 MPa to form a powder particle layer which is not completely melted with the inner surface of the shell;
and fifthly, placing the shell mold into the furnace body, heating to 130-139 ℃, heating in a rotating state for no more than 2min, withdrawing the shell mold from the furnace body, and naturally cooling to room temperature to obtain the fixed structure formed on the surface of the rotational molding polyolefin product.
2. The preparation process of the fixed structure on the surface of the rotational molding polyolefin part according to claim 1, wherein the fixed structure comprises a fixed micro-nano layer which is formed in the hollow part in advance and has good compatibility with the rotational molding wall of the polyolefin of the hollow part, and the fixed micro-nano layer and a subsequent filling coating layer form a stable multilayer structure.
3. The process for preparing a fixing structure on the surface of a rotomoulded polyolefin part according to claim 2, wherein the fixing micro-nano layer is composed of a group of fixing columns with different sizes, the average height of the group of fixing columns is 1 mm, and the fixing columns and the subsequent filling coating layer are mutually interpenetrated to form a network interlocking structure.
4. The process according to claim 3, wherein the high molecular weight polyethylene has a molecular weight of 300-500 ten thousand and a density of 0.92-0.96g/m thin film obtained by flash evaporation; the softening temperature of the high molecular weight polyethylene is 85 ℃ under the pressure condition of 0.46MPa, and the melting point is 130-136 ℃.
5. The process for the preparation of a fixed structure on the surface of a rotomoulded polyolefin article according to claim 4 wherein the low melting polyester is a polyethylene nucleating agent.
6. The process of claim 5, wherein the polyethylene nucleating agent is hyper form hpn-20E from meliken corporation.
7. The process of claim 6 wherein in the fourth step the amount of said pretreatment material used is 150 grams per square meter.
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| NL1016779C2 (en) * | 2000-12-02 | 2002-06-04 | Cornelis Johannes Maria V Rijn | Mold, method for manufacturing precision products with the aid of a mold, as well as precision products, in particular microsieves and membrane filters, manufactured with such a mold. |
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| CN102227294A (en) * | 2008-10-02 | 2011-10-26 | 道达尔石油化学产品研究弗吕公司 | Rotomoulded structural parts having asymmetrical layering |
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Effective date of registration: 20230602 Address after: No. 20, Shengqian, Hualian Village, Gucheng Town, Gaochun District, Nanjing City, Jiangsu Province, 211304 Patentee after: He Yucheng Address before: 210034 No. 8 Yuanhua Road, Xianlin University, Nanjing, Jiangsu Province Patentee before: NANJING GOUHE MATERIALS TECHNOLOGY Co.,Ltd. |