阅读说明：本技术 化学交联聚乙烯泡棉及其制备方法 (Chemical crosslinking polyethylene foam and preparation method thereof ) 是由 马琦入 魏立东 李志刚 郭俊杰 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种化学交联聚乙烯泡棉及其制备方法,该化学交联聚乙烯泡棉包括以下重量份的原料制备而成：极性橡胶3-15份、发泡剂15-25份、低密度聚乙烯55-81.5份、改性剂1-4份、交联剂0.3-3份和助交联剂0.2-2份。本发明通过添加极性橡胶增加配方体系极性,辅以添加改性剂,使体系极性进一步提高,有效提升了聚乙烯泡棉的表面能,使表面更容易与胶层或涂层相结合,不需要后处理工序,节约成本。(The invention discloses a chemical crosslinking polyethylene foam and a preparation method thereof, wherein the chemical crosslinking polyethylene foam is prepared from the following raw materials in parts by weight: 3-15 parts of polar rubber, 15-25 parts of foaming agent, 55-81.5 parts of low-density polyethylene, 1-4 parts of modifier, 0.3-3 parts of cross-linking agent and 0.2-2 parts of auxiliary cross-linking agent. According to the invention, the polarity of the formula system is increased by adding the polar rubber, and the addition of the modifier is assisted, so that the polarity of the system is further improved, the surface energy of the polyethylene foam is effectively improved, the surface is more easily combined with an adhesive layer or a coating, a post-treatment process is not needed, and the cost is saved.)

1. The chemical crosslinking polyethylene foam is characterized by comprising the following raw materials in parts by weight: 3-15 parts of polar rubber, 15-25 parts of foaming agent, 55-81.5 parts of low-density polyethylene, 1-4 parts of modifier, 0.3-3 parts of cross-linking agent and 0.2-2 parts of auxiliary cross-linking agent.

2. The chemically cross-linked polyethylene foam according to claim 1, wherein the polar rubber is at least one of nitrile rubber, chloroprene rubber and acrylate rubber.

3. The chemically cross-linked polyethylene foam according to claim 1, wherein the foaming agent is at least one of azodicarbonamide, benzenesulfonylhydrazide, dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide or 4, 4' -oxybis-benzenesulfonylhydrazide.

4. The chemically crosslinked polyethylene foam according to claim 1, wherein the crosslinking agent is dicumyl peroxide, and the co-crosslinking agent is at least one of TMPTMA and TAIC.

5. The chemically cross-linked polyethylene foam as claimed in claim 1, wherein the modifier is chlorinated polyethylene.

6. The chemical crosslinking polyethylene foam as claimed in claim 1, wherein the melting point of the low density polyethylene is 100-110 ℃, and the melt index is 1.0-6.0g/10 min; the particle size of the foaming agent is 10-15nm, and the decomposition temperature is 200-220 ℃.

7. A method for preparing the chemically cross-linked polyethylene foam as claimed in any one of claims 1 to 6, characterized by comprising the following steps:

1) banburying and mixing the foaming agent and the low-density polyethylene at 105-115 ℃ for 8-12min, and granulating to prepare foaming agent master batches; banburying and mixing modifier and low density polyethylene at 105-115 deg.c for 8-12min, and pelletizing to obtain modified mother grain; banburying and mixing the cross-linking agent and the low-density polyethylene at 105-115 ℃ for 8-12min, and granulating to obtain cross-linking agent master batches; banburying and mixing the auxiliary crosslinking agent and the low-density polyethylene at 105-115 ℃ for 8-12min, and granulating to obtain master batches of the auxiliary crosslinking agent;

2) weighing low-density polyethylene, polar rubber, the foaming agent master batch, the modified master batch, the crosslinking agent master batch and the auxiliary crosslinking agent master batch according to the weight parts of the raw materials, uniformly mixing, and performing melt extrusion by using a single-screw extruder to obtain a master slice;

3) and carrying out cross-linking foaming treatment on the master slice through a foaming furnace to obtain the chemical cross-linking polyethylene foam.

8. The preparation method of claim 7, wherein in the step 1), the foaming agent masterbatch comprises the following components in parts by weight: 30-40 parts of foaming agent and 60-70 parts of low-density polyethylene; the modified master batch comprises the following components in parts by weight: 10-20 parts of modifier and 80-90 parts of low-density polyethylene; the cross-linking agent master batch comprises the following components in parts by weight: 1-5 parts of a cross-linking agent and 95-99 parts of low-density polyethylene; the auxiliary crosslinking agent master batch comprises the following components in parts by weight: 1-5 parts of auxiliary crosslinking agent and 95-99 parts of low-density polyethylene.

9. The preparation method of claim 7, wherein in the step 2), the raw materials are weighed and further comprise 1-4 parts by weight of color master batch.

10. The preparation method according to claim 7, wherein in the step 2), the temperatures of the sections of the single-screw extruder are respectively set as follows: the first zone is 100-108 ℃, the second zone is 100-108 ℃, the third zone is 101-109 ℃, the fourth zone is 102-110 ℃, the fifth zone is 102-110 ℃, the sixth zone is 103-111 ℃, the seventh zone is 105-113 ℃, the connector temperature is 95-102 ℃, and the three zones of the mold are 105-113 ℃; the screw rotating speed of the single-screw extruder is 16-18 r/min.

11. The method as claimed in claim 7, wherein in step 3), the temperature of the preheating section of the foaming furnace is 145-165 ℃, the temperature of the foaming section of the foaming furnace is 190-220 ℃, and the mesh belt speed is 2-4 m/min.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of foam plastic materials, in particular to chemically crosslinked polyethylene foam and a preparation method thereof.

[ background of the invention ]

The chemical crosslinking polyethylene foam is a foam product which is prepared by melting, uniformly mixing and extruding low-density polyethylene serving as a main raw material and a foaming agent, a crosslinking agent and the like serving as auxiliary raw materials and continuously foaming at a high temperature. The chemical crosslinking polyethylene foam has the characteristics of stable chemical property, difficult decomposition, no odor and good elasticity, and is widely applied to the industries of air-conditioning refrigeration industry, packaging industry, building, engineering and the like.

However, the surface energy of the chemically crosslinked polyethylene foam is very low, and the adhesive force of the adhesive layer or the coating on the surface of the foam is low, so that the foam is easy to fall off. The prior art generally carries out corona treatment on the surface of foam to increase the surface polarity. However, the corona treatment has timeliness, the treatment effect can be attenuated or failed along with different environments and storage time, the treatment effect is limited by treatment equipment, the thickness of the foam is greatly limited, and the decay speed of the corona effect is higher when the foam material is thicker than when the foam material is thinner; if the glue is not applied, the glue needs to be reprocessed subsequently, and the cost is higher. In view of the above, it is actually necessary to provide a chemically crosslinked polyethylene foam and a preparation method thereof to overcome the above defects.

[ summary of the invention ]

The invention aims to provide chemical crosslinking polyethylene foam and a preparation method thereof, which can increase the polarity of a system and improve the surface energy of the foam.

In order to achieve the purpose, the invention provides a chemical crosslinking polyethylene foam which is prepared from the following raw materials in parts by weight: 3-15 parts of polar rubber, 15-25 parts of foaming agent, 55-81.5 parts of low-density polyethylene, 1-4 parts of modifier, 0.3-3 parts of cross-linking agent and 0.2-2 parts of auxiliary cross-linking agent.

In a preferred embodiment, the polar rubber is at least one of nitrile rubber, neoprene rubber, acrylate rubber.

In a preferred embodiment, the blowing agent is at least one of azodicarbonamide, benzenesulfonylhydrazide, dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide or 4, 4' -oxybis-benzenesulfonylhydrazide.

In a preferred embodiment, the crosslinking agent is dicumyl peroxide (DCP) and the co-crosslinking agent is at least one of trimethylolpropane trimethacrylate (TMPTMA) and triallyl isocyanurate (TAIC).

In a preferred embodiment, the modifier is chlorinated polyethylene.

In a preferred embodiment, the low density polyethylene has a melting point of 100-110 ℃ and a melt index of 1.0-6.0g/10 min; the particle size of the foaming agent is 10-15nm, and the decomposition temperature is 200-220 ℃.

In order to achieve the above object, the present invention also provides a method for preparing chemically cross-linked polyethylene foam, comprising the following steps:

1) banburying and mixing the foaming agent and the low-density polyethylene at 105-115 ℃ for 8-12min, and granulating to prepare foaming agent master batches; banburying and mixing modifier and low density polyethylene at 105-115 deg.c for 8-12min, and pelletizing to obtain modified mother grain; banburying and mixing the cross-linking agent and the low-density polyethylene at 105-115 ℃ for 8-12min, and granulating to obtain cross-linking agent master batches; banburying and mixing the auxiliary crosslinking agent and the low-density polyethylene at 105-115 ℃ for 8-12min, and granulating to obtain master batches of the auxiliary crosslinking agent;

2) weighing low-density polyethylene, polar rubber, the foaming agent master batch, the modified master batch, the crosslinking agent master batch and the auxiliary crosslinking agent master batch according to the weight parts of the raw materials, uniformly mixing, and performing melt extrusion by using a single-screw extruder to obtain a master slice;

3) and carrying out cross-linking foaming treatment on the master slice through a foaming furnace to obtain the chemical cross-linking polyethylene foam.

In a preferred embodiment, in step 1), the foaming agent masterbatch comprises the following components in parts by weight: 30-40 parts of foaming agent and 60-70 parts of low-density polyethylene; the modified master batch comprises the following components in parts by weight: 10-20 parts of modifier and 80-90 parts of low-density polyethylene; the cross-linking agent master batch comprises the following components in parts by weight: 1-5 parts of a cross-linking agent and 95-99 parts of low-density polyethylene; the auxiliary crosslinking agent master batch comprises the following components in parts by weight: 1-5 parts of auxiliary crosslinking agent and 95-99 parts of low-density polyethylene.

In a preferred embodiment, in step 2), the raw materials are weighed and further comprise 1-4 parts by weight of color master batch.

In a preferred embodiment, in step 2), the temperatures of the sections of the single-screw extruder are respectively set as follows: the first zone is 100-108 ℃, the second zone is 100-108 ℃, the third zone is 101-109 ℃, the fourth zone is 102-110 ℃, the fifth zone is 102-110 ℃, the sixth zone is 103-111 ℃, the seventh zone is 105-113 ℃, the connector temperature is 95-102 ℃, and the three zones of the mold are 105-113 ℃; the screw rotating speed of the single-screw extruder is 16-18 r/min.

In a preferred embodiment, in step 3), the temperature of the preheating section of the foaming furnace is 145-165 ℃, the temperature of the foaming section of the foaming furnace is 190-220 ℃, and the mesh belt speed is 2-4 m/min.

The invention has the beneficial effects that: the polarity of a formula system is increased by adding the polar rubber, and the addition of the modifier is assisted, so that the polarity of the system is further improved, the surface energy of the polyethylene foam is effectively improved, the surface is more easily combined with an adhesive layer or a coating, a post-treatment process is not needed, the production cost is greatly saved, and the polyethylene foam is suitable for large-scale industrial production.

[ detailed description ] embodiments

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail with reference to examples.

The invention provides a chemically crosslinked polyethylene foam which is prepared from the following raw materials in parts by weight: 3-15 parts of polar rubber, 15-25 parts of foaming agent, 55-81.5 parts of low-density polyethylene, 1-4 parts of modifier, 0.3-3 parts of cross-linking agent and 0.2-2 parts of auxiliary cross-linking agent.

According to the invention, the polarity of the formula system is increased by adding the polar rubber, the effect of enhancing the polarity of the system is assisted by adding the modifier, the surface energy of the polyethylene foam is effectively improved, the surface is more easily combined with an adhesive layer or a coating, a post-treatment process is not needed, the production cost is greatly saved, and the polyethylene foam is suitable for large-scale industrial production.

According to some embodiments of the invention, the polar rubber is at least one of nitrile rubber, neoprene rubber, acrylate rubber, and the blowing agent is at least one of azodicarbonamide, benzenesulfonyl hydrazide, dinitrosopentamethylenetetramine, p-toluenesulfonyl hydrazide, or 4, 4' -oxybis-benzenesulfonyl hydrazide.

According to some embodiments of the invention, the crosslinking agent is dicumyl peroxide and the co-crosslinking agent is at least one of TMPTMA and TAIC.

According to some embodiments of the invention, the modifier is a modified polyethylene resin, preferably, the modifier is chlorinated polyethylene.

According to some embodiments of the invention, the low density polyethylene has a melting point of 100-; the particle size of the foaming agent is 10-15nm, and the decomposition temperature is 200-220 ℃.

The invention also provides a preparation method of the chemically crosslinked polyethylene foam, which comprises the following steps:

1) banburying and mixing the foaming agent and the low-density polyethylene at 105-115 ℃ for 8-12min, and granulating to prepare foaming agent master batches; banburying and mixing modifier and low density polyethylene at 105-115 deg.c for 8-12min, and pelletizing to obtain modified mother grain; banburying and mixing the cross-linking agent and the low-density polyethylene at 105-115 ℃ for 8-12min, and granulating to obtain cross-linking agent master batches; banburying and mixing the auxiliary crosslinking agent and the low-density polyethylene at 105-115 ℃ for 8-12min, and granulating to obtain master batches of the auxiliary crosslinking agent;

2) weighing low-density polyethylene, polar rubber, the foaming agent master batch, the modified master batch, the crosslinking agent master batch and the auxiliary crosslinking agent master batch according to the weight parts of the raw materials, uniformly mixing, and performing melt extrusion by using a single-screw extruder to obtain a master slice;

3) and carrying out cross-linking foaming treatment on the master slice through a foaming furnace to obtain the chemical cross-linking polyethylene foam.

According to the embodiment of the invention, the foaming agent master batch, the modified master batch, the cross-linking agent master batch and the auxiliary cross-linking agent master batch are prepared, so that the foaming agent, the modifying agent, the cross-linking agent and the auxiliary cross-linking agent are uniformly dispersed in the low-density polyethylene respectively, and the low-density polyethylene has good plasticization and is convenient to process.

According to some embodiments of the present invention, in step 1), the foaming agent masterbatch comprises the following components in parts by weight: 30-40 parts of foaming agent and 60-70 parts of low-density polyethylene; the modified master batch comprises the following components in parts by weight: 10-20 parts of modifier and 80-90 parts of low-density polyethylene; the cross-linking agent master batch comprises the following components in parts by weight: 1-5 parts of a cross-linking agent and 95-99 parts of low-density polyethylene; the auxiliary crosslinking agent master batch comprises the following components in parts by weight: 1-5 parts of auxiliary crosslinking agent and 95-99 parts of low-density polyethylene.

According to some embodiments of the present invention, in step 2), 1 to 4 parts by weight of color masterbatch is further included when weighing each raw material. Specifically, the chemically crosslinked polyethylene foam with various colors can be prepared according to requirements, for example, the color master batch can be titanium dioxide master batch, carbon black master batch and the like.

According to some embodiments of the invention, in step 2), the temperatures of the sections of the single-screw extruder are respectively set as follows: the first zone is 100-108 ℃, the second zone is 100-108 ℃, the third zone is 101-109 ℃, the fourth zone is 102-110 ℃, the fifth zone is 102-110 ℃, the sixth zone is 103-111 ℃, the seventh zone is 105-113 ℃, the connector temperature is 95-102 ℃, and the three zones of the mold are 105-113 ℃; the screw rotating speed of the single-screw extruder is 16-18 r/min. Through the control of the temperature of each section of the single-screw extruder, the sheet material is uniformly plasticized, has uniform thickness and smooth surface, the shearing force of the foaming agent on the screw is reduced to the maximum extent, and the decomposition of the foaming agent is avoided.

According to some embodiments of the invention, in step 3), the temperature of the preheating section, i.e. the cross-linking section, of the foaming furnace is 145-165 ℃, the temperature of the foaming section of the foaming furnace is 190-230 ℃, and the mesh belt speed is 2-4m/min, and the foaming furnace is specifically a gas-fired horizontal foaming furnace.

The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.