CN116554427A - Antistatic sponge and preparation method thereof - Google Patents
Antistatic sponge and preparation method thereof Download PDFInfo
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- CN116554427A CN116554427A CN202310327954.2A CN202310327954A CN116554427A CN 116554427 A CN116554427 A CN 116554427A CN 202310327954 A CN202310327954 A CN 202310327954A CN 116554427 A CN116554427 A CN 116554427A
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- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 158
- 229920000570 polyether Polymers 0.000 claims abstract description 158
- 229920005862 polyol Polymers 0.000 claims abstract description 158
- 150000003077 polyols Chemical class 0.000 claims abstract description 158
- 239000002216 antistatic agent Substances 0.000 claims abstract description 45
- 239000003054 catalyst Substances 0.000 claims abstract description 36
- 239000012948 isocyanate Substances 0.000 claims abstract description 29
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 26
- 229920002545 silicone oil Polymers 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 16
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000005187 foaming Methods 0.000 claims description 21
- 150000001412 amines Chemical class 0.000 claims description 14
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 150000003973 alkyl amines Chemical class 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 14
- 230000035699 permeability Effects 0.000 abstract description 12
- 238000006116 polymerization reaction Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 10
- 238000004806 packaging method and process Methods 0.000 description 9
- 238000004132 cross linking Methods 0.000 description 8
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- -1 ethoxylated octadecyl primary amine Chemical class 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
- C08G18/4812—Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4072—Mixtures of compounds of group C08G18/63 with other macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/63—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers
- C08G18/632—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers onto polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2101/00—Manufacture of cellular products
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0025—Foam properties rigid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0083—Foam properties prepared using water as the sole blowing agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/017—Additives being an antistatic agent
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses an antistatic sponge and a preparation method thereof, and belongs to the technical field of sponge production. The raw materials for preparing the antistatic sponge comprise: a first polyether polyol, a second polyether polyol, a modified second polyether polyol, water, an antistatic agent, silicone oil, a catalyst and isocyanate; the functionality of the first polyether polyol is 2, the functionality of the second polyether polyol is 3, and the modified second polyether polyol is the product of grafting the second polyether polyol with styrene and methyl methacrylate. According to the antistatic sponge provided by the invention, the antistatic agent is added, and the first polyether polyol, the second polyether polyol and the modified second polyether polyol which are different in activity are adopted, so that the speed of a polymerization reaction is matched with the speed of exhaust, and bubbles can be exhausted, the porosity is greatly improved, and the air permeability of the sponge is further improved.
Description
Technical Field
The invention relates to the technical field of sponge production, in particular to an antistatic sponge and a preparation method thereof.
Background
In recent years, sponges are widely used in the field of electronic component packaging because they are lightweight, inexpensive, easy to cut, and have a cushioning and shock-resistant effect. However, the sponge is prone to static electricity, which can affect its use in packaging applications. In this regard, the prior art adds an antistatic agent during the production of the sponge to make the prepared sponge antistatic. Among the antistatic agents currently added to sponges are carbon black, activated carbon, ABS seeds, ionic antistatic agents, nonionic antistatic agents, wherein the use of ionic antistatic agents in sponges is limited because inorganic antistatic agents affect the strength of the sponges and ionic antistatic agents migrate into metal ions. The nonionic antistatic agent has the best dispersibility in the sponge and the best antistatic effect, and is therefore widely used in the production and manufacture of antistatic sponges. However, since the nonionic antistatic agent contains a large amount of polar groups and nonpolar groups, it has surface activity, which tends to cause shrinkage of closed cells, and thus the air permeability of the antistatic agent is reduced, and the packaging requirements of electronic components cannot be satisfied.
It can be seen that there is a need for improvements and improvements in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide an antistatic sponge and a preparation method thereof, which aims to solve the defects of low porosity and poor air permeability of the sponge added with a nonionic antistatic agent in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an antistatic sponge, wherein the raw materials for preparing the antistatic sponge comprise: a first polyether polyol, a second polyether polyol, a modified second polyether polyol, water, an antistatic agent, silicone oil, a catalyst and isocyanate; the functionality of the first polyether polyol is 2, the functionality of the second polyether polyol is 3, and the modified second polyether polyol is the product of grafting the second polyether polyol with styrene and methyl methacrylate.
In the antistatic sponge, the hydroxyl value of the first polyether polyol and the second polyether polyol is 56.
In the antistatic sponge, the hydroxyl value of the modified second polyether polyol is 29, and the solid content is 45%.
In the antistatic sponge, the addition amount of the first polyether polyol accounts for 25-40% of the total mass of the first polyether polyol, the second polyether polyol and the modified second polyether polyol.
In the antistatic sponge, the antistatic agent is an ethoxylated alkylamine antistatic agent.
In the antistatic sponge, the raw materials for preparing the antistatic sponge comprise the following components in parts by weight: 25-40 parts of first polyether polyol, 10-30 parts of second polyether polyol, 30-65 parts of modified second polyether polyol, 2-3.5 parts of water, 1 part of antistatic agent, 1-1.2 parts of silicone oil, 0.12-0.17 part of amine catalyst, 0.1-0.14 part of gel catalyst and 33-48 parts of isocyanate.
In the antistatic sponge, the raw materials for preparing the antistatic sponge comprise the following components in parts by weight: 30 parts of a first polyether polyol, 20 parts of a second polyether polyol, 50 parts of a modified second polyether polyol, 3 parts of water, 1 part of an antistatic agent, 1.1 parts of silicone oil, 0.15 part of an amine catalyst, 0.12 part of a gel catalyst and 39 parts of isocyanate.
A method for preparing an antistatic sponge as described above, wherein the method comprises the steps of: taking the first polyether polyol, the second polyether polyol, the modified second polyether polyol, water, antistatic agent, silicone oil and catalyst, and stirring and uniformly mixing to obtain a mixture; taking isocyanate and adding the isocyanate into the mixed material, and rapidly stirring for 4-5s to obtain foaming slurry; pouring the foaming slurry into a mould for foaming; and curing for 24 hours at 25 ℃ after foaming is finished, and obtaining a finished product.
In the preparation method of the antistatic sponge, the temperature of the mixture and the isocyanate before mixing is 23-25 ℃.
The beneficial effects are that:
the invention provides an antistatic sponge and a preparation method thereof, wherein antistatic agents are added into raw materials for preparing the antistatic sponge, and simultaneously, first polyether polyol, second polyether polyol and modified second polyether polyol with different activities are adopted, so that the speed of polymerization reaction is matched with the speed of exhaust, and bubbles can be exhausted, the porosity is greatly improved, and the air permeability of the sponge is further improved. Meanwhile, the hardness of the sponge can be greatly improved by adopting the second polyether polyol modified by the styrene and the methyl methacrylate, and the requirement of the external package of the electronic element on the hardness is met.
Detailed Description
The invention provides an antistatic sponge and a preparation method thereof, and the invention is further described in detail in the following examples in order to make the purposes, technical schemes and effects of the invention clearer and more definite. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides an antistatic sponge, which is prepared from the raw materials of a first polyether polyol, a second polyether polyol, a modified second polyether polyol, water, an antistatic agent, silicone oil, a catalyst and isocyanate. Wherein the first polyether polyol has a functionality of 2, the second polyether polyol has a functionality of 3, the first polyether polyol has an average molecular weight of 2000, the second polyether polyol has an average molecular weight of 3000, and the modified second polyether polyol is the product of grafting the second polyether polyol with styrene and methyl methacrylate.
In the raw materials of the antistatic sponge, the activity of the second polyether polyol is higher, and the added antistatic agent and silicone oil both contain a large number of active groups, so that the speed of polymerization and reaction can be accelerated, the speed of bubble generation can not keep up with the speed of crosslinking, gas can not be discharged easily, closed pores are formed, the aperture ratio is finally low, the air permeability is poor, and the sponge finished product can not reach the standard. In order to improve the porosity, the invention adds the first polyether polyol with the functionality of 2 into the raw material by adjusting the speed of the polymerization reaction, namely, the first polyether polyol with lower activity is adopted to replace the second polyether polyol, so that the speed of the polymerization reaction is reduced, the polymerization speed is further adapted to the foaming speed, the generated bubbles can be discharged through the pores, and the porosity and the air permeability of the sponge are improved. In addition, in order to ensure that the obtained antistatic sponge has better hardness, the modified second polyether polyol grafted by the second polyether polyol and grafted by the methyl methacrylate is adopted as a main raw material, and the grafted second polyether polyol not only can keep better activity, but also can form a better reticular cross-linked structure, so that the hardness of the sponge can be greatly improved.
According to the antistatic sponge, the preparation raw materials are adjusted, and the first polyether polyol, the second polyether polyol and the modified second polyether polyol with different activities are matched for use, so that the foaming speed is matched with the polymerization speed, bubbles can be discharged, and the porosity is improved. The antistatic sponge prepared from the raw materials has excellent antistatic property, and the porosity can reach 95%, so that the requirement of the sponge as an electronic element packaging application is met.
In a preferred embodiment, the hydroxyl number of the first polyether polyol and the second polyether polyol are both 56mgKOH/g, the average molecular weight of the first polyether polyol is 2000, and the average molecular weight of the second polyether polyol is 3000; the modified second polyether polyol has a hydroxyl value of 29mgKOH/g (the molecular weight of the modified second polyether polyol is not measurable, and the molecular weight is theoretically more than 3000 because it is a mixture). In this example, the first polyether polyol and the second polyether polyol having the same hydroxyl value and different average molecular weights, and the modified second polyether polyol having the different hydroxyl value and the second polyether polyol are used, so that not only can the crosslinking speed be adjusted, but also the gradation can be formed due to the different molecular weights of the three, and the sponge product with hardness and rebound resilience suitable for packaging of electronic components can be obtained by better crosslinking in polymerization.
The higher the addition amount of the first polyether polyol is, the slower the crosslinking speed is, the higher the opening ratio of the formed cells is, but the foaming rate is reduced, while the lower the addition amount of the first polyether polyol is, the faster the crosslinking speed is, the lower the opening ratio of the formed cells is, and the requirement of the sponge air permeability cannot be met. In order to ensure the adaptation of the crosslinking speed and the foaming speed during the preparation, under the condition of not changing other auxiliary materials, the addition amount of the first polyether polyol is not less than 25 percent and not more than 40 percent of the total amount of the first polyether polyol, the second polyether polyol and the modified second polyether polyol, and when the addition amount of the first polyether polyol is between 25 percent and 40 percent, the foam has better aperture ratio and good air permeability, and the sponge density, the hardness and the rebound resilience can meet the requirements.
In a preferred embodiment, the modified second polyether polyol has a solids content of 45%. Because the modified second polyether polyol is a product obtained by modifying styrene and methyl methacrylate on the basis of the second polyether polyol, the addition amount of the styrene and the methyl methacrylate can influence the activity of the modified product during modification, and further can influence the hardness and the rebound resilience of the sponge. When the total addition amount of the styrene and the methyl methacrylate is 45%, that is, the solid content of the modified second polyether polyol is equal to that of the modified second polyether polyol, the activity of the modified product is close to that of the modified second polyether polyol, the amounts of the second polyether polyol and the modified second polyether polyol can be conveniently prepared, and the product obtained after the reaction of the first polyether polyol, the second polyether polyol and the modified polyether polyol has more proper hardness and rebound resilience and is suitable for being used as a package of electronic elements.
In a preferred embodiment, the antistatic agent is an ethoxylated alkylamine type antistatic agent, such as an ethoxylated octadecyl primary amine, an ethoxylated cocoalkylamine, and the like. The ethoxylated alkylamine antistatic agent is a nonionic antistatic agent, has better dispersibility and compatibility in sponge raw materials, and has better antistatic effect.
In a preferred embodiment, the antistatic sponge is prepared from the following raw materials in parts by weight: 25-40 parts of first polyether polyol, 10-30 parts of second polyether polyol, 30-65 parts of modified second polyether polyol, 2-3.5 parts of water, 1 part of antistatic agent, 1-1.2 parts of silicone oil, 0.12-0.17 part of amine catalyst, 0.1-0.14 part of gel catalyst and 33-48 parts of isocyanate. The antistatic sponge prepared from the raw materials in the proportion has good antistatic property, high porosity and good air permeability.
In a preferred embodiment, the antistatic sponge comprises the following raw materials in parts by weight: 30 parts of a first polyether polyol, 20 parts of a second polyether polyol, 50 parts of a modified second polyether polyol, 3 parts of water, 1 part of an antistatic agent, 1.1 parts of silicone oil, 0.15 part of an amine catalyst, 0.12 part of a gel catalyst and 39 parts of isocyanate. The antistatic sponge prepared by the embodiment has the surface resistance of 35 omega, the porosity of 97 percent and better hardness and rebound resilience.
The invention also provides a preparation method of the antistatic sponge, which is used for preparing the antistatic sponge, and comprises the following steps: mixing the first polyether polyol, the second polyether polyol, the modified second polyether polyol, water, antistatic agent, silicone oil and catalyst according to the proportion, and stirring uniformly to obtain a mixture; taking isocyanate and adding the isocyanate into the mixed material, and rapidly stirring for 4-5s to obtain foaming slurry; pouring the foaming slurry into a mould for foaming; and curing for 24 hours at 25 ℃ after foaming is finished, and obtaining a finished product.
By the preparation method, the sponge with high antistatic performance, high porosity and high air permeability can be prepared, and can be used for packaging electronic elements, and the performance of the sponge can meet various requirements of packaging.
In a preferred embodiment, the isocyanate is added at a temperature of 23 to 25℃to avoid excessive foaming due to excessive crosslinking speed resulting from excessive initial temperature after mixing, thus ensuring that the temperature of each material is 23 to 25℃prior to storage and mixing.
To further illustrate the antistatic sponge and the preparation method thereof provided by the invention, the following examples are provided.
Example 1
A preferred antistatic sponge comprises the following raw materials in parts by weight: 30 parts of a first polyether polyol, 20 parts of a second polyether polyol, 50 parts of a modified second polyether polyol, 3 parts of water, 1 part of an antistatic agent, 1.1 parts of silicone oil, 0.15 part of an amine catalyst, 0.12 part of a gel catalyst and 39 parts of isocyanate.
The preparation method of the antistatic sponge comprises the following preparation steps: mixing the first polyether polyol, the second polyether polyol, the modified second polyether polyol, water, antistatic agent, silicone oil and catalyst according to the proportion, and stirring uniformly to obtain a mixture; taking isocyanate and adding the isocyanate into the mixed material, and rapidly stirring for 4-5s to obtain foaming slurry; pouring the foaming slurry into a mould for foaming; and curing for 24 hours at 25 ℃ after foaming is finished, and obtaining a finished product.
Example 2
The antistatic sponge comprises the following raw materials in parts by weight: 25 parts of a first polyether polyol, 10 parts of a second polyether polyol, 65 parts of a modified second polyether polyol, 2 parts of water, 1 part of an antistatic agent, 1 part of silicone oil, 0.12 part of an amine catalyst, 0.1 part of a gel catalyst and 33 parts of isocyanate.
Example 3
The antistatic sponge comprises the following raw materials in parts by weight: 40 parts of a first polyether polyol, 30 parts of a second polyether polyol, 30 parts of a modified second polyether polyol, 3.5 parts of water, 1 part of an antistatic agent, 1.2 parts of silicone oil, 0.17 part of an amine catalyst, 0.14 part of a gel catalyst and 48 parts of isocyanate.
Example 4
The antistatic sponge comprises the following raw materials in parts by weight: 35 parts of a first polyether polyol, 25 parts of a second polyether polyol, 40 parts of a modified second polyether polyol, 3 parts of water, 1 part of an antistatic agent, 1.1 parts of silicone oil, 0.15 part of an amine catalyst, 0.12 part of a gel catalyst and 42 parts of isocyanate.
Comparative example 1
The antistatic sponge comprises the following raw materials in parts by weight: 50 parts of second polyether polyol, 50 parts of modified second polyether polyol, 3 parts of water, 1 part of antistatic agent, 1.1 part of silicone oil, 0.15 part of amine catalyst, 0.12 part of gel catalyst and 39 parts of isocyanate. Wherein the hydroxyl values of the second polyether polyol are 56mgKOH/g, and the average molecular weight of the second polyether polyol is 3000; the hydroxyl value of the modified second polyether polyol was 29mgKOH/g and the solid content was 45%.
Comparative example 2
The antistatic sponge comprises the following raw materials in parts by weight: 50 parts of a first polyether polyol, 25 parts of a second polyether polyol, 25 parts of a modified second polyether polyol, 3 parts of water, 1 part of an antistatic agent, 1.1 parts of silicone oil, 0.15 part of an amine catalyst, 0.12 part of a gel catalyst and 39 parts of isocyanate.
Comparative example 3
The antistatic sponge comprises the following raw materials in parts by weight: 10 parts of a first polyether polyol, 40 parts of a second polyether polyol, 50 parts of a modified second polyether polyol, 3 parts of water, 1 part of an antistatic agent, 1.1 parts of silicone oil, 0.15 part of an amine catalyst, 0.12 part of a gel catalyst and 39 parts of isocyanate.
Comparative example 4
The antistatic sponge comprises the following raw materials in parts by weight: 30 parts of first polyether polyol, 70 parts of second polyether polyol, 3 parts of water, 1 part of antistatic agent, 1.1 part of silicone oil, 0.15 part of amine catalyst, 0.12 part of gel catalyst and 39 parts of isocyanate.
In examples 1 to 4 and comparative examples 1 to 4, the hydroxyl value of the first polyether polyol and the second polyether polyol was 56mgKOH/g, the average molecular weight of the first polyether polyol was 2000, and the average molecular weight of the second polyether polyol was 3000; the hydroxyl value of the modified second polyether polyol was 29mgKOH/g and the solid content was 45%.
The preparation methods of examples 2 to 4 and comparative examples 1 to 4 were the same as those of example 1, except that the proportions of the first polyether polyol, the second polyether polyol and the modified second polyether polyol were different.
The antistatic sponges of examples 1 to 4 and comparative examples 1 to 3 were tested for hardness, resilience, antistatic property, and open cell content. Wherein the hardness is measured according to the method A of the hardness measurement (collapse method) of the soft foam polymer material of GB/T10807-2006; the rebound resilience is carried out according to the GB6670-86 standard; the antistatic property testing method comprises the following steps: measuring the surface resistance value of the sponge material by using a surface resistance tester, wherein the smaller the resistance value is, the better the antistatic effect is; the open porosity is tested by using a sponge open porosity detector provided by Bei Shide company. The specific test results are shown in table 1.
TABLE 1 antistatic sponge Performance test results
As is clear from Table 1, the surface resistances of examples 1 to 4 were 35. OMEGA, the opening ratios thereof were 95% or more, and the air permeability was good, and the indentation hardness and rebound resilience thereof were good, so that the composition was very suitable for packaging electronic components.
In comparative examples 1 and 3, however, the first polyether polyol was not added or the first polyether polyol was added in a small amount, and thus the open cell content was low, resulting in poor air permeability of the sponge. However, in comparative example 2, the amount of the first polyether polyol added is too large, so that the gas generation speed is higher than the crosslinking speed, and the phenomenon of implosion occurs, so that the product cannot be molded and cannot be detected; in comparative example 4, since the modified second polyether polyol was not added, the hardness was 184N alone, which was very low, and the supporting property was lowered, which was not suitable for packaging electronic components.
Therefore, the prepared sponge has good antistatic performance and proper hardness, rebound resilience and aperture ratio through the combination of the first polyether polyol, the second polyether polyol and the modified second polyether polyol and the addition of the antistatic agent.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (9)
1. An antistatic sponge, characterized in that the raw materials for preparing the antistatic sponge comprise: a first polyether polyol, a second polyether polyol, a modified second polyether polyol, water, an antistatic agent, silicone oil, a catalyst and isocyanate; the functionality of the first polyether polyol is 2, the functionality of the second polyether polyol is 3, and the modified second polyether polyol is the product of grafting the second polyether polyol with styrene and methyl methacrylate.
2. An antistatic sponge according to claim 1 wherein the first and second polyether polyols each have a hydroxyl number of 56.
3. An antistatic sponge according to claim 2 wherein the modified second polyether polyol has a hydroxyl number of 29 and a solids content of 45%.
4. An antistatic sponge according to claim 3 wherein the first polyether polyol is added in an amount of 25% to 40% of the total mass of the first polyether polyol, the second polyether polyol and the modified second polyether polyol.
5. The antistatic sponge of claim 4 wherein the antistatic agent is an ethoxylated alkylamine type antistatic agent.
6. The antistatic sponge of claim 5 wherein the raw materials for preparing the antistatic sponge comprise, in parts by weight: 25-40 parts of first polyether polyol, 10-30 parts of second polyether polyol, 30-65 parts of modified second polyether polyol, 2-3.5 parts of water, 1 part of antistatic agent, 1-1.2 parts of silicone oil, 0.12-0.17 part of amine catalyst, 0.1-0.14 part of gel catalyst and 33-48 parts of isocyanate.
7. The antistatic sponge of claim 1, wherein the raw materials for preparing the antistatic sponge comprise, in parts by weight: 30 parts of a first polyether polyol, 20 parts of a second polyether polyol, 50 parts of a modified second polyether polyol, 3 parts of water, 1 part of an antistatic agent, 1.1 parts of silicone oil, 0.15 part of an amine catalyst, 0.12 part of a gel catalyst and 39 parts of isocyanate.
8. A method of preparing an antistatic sponge for use in preparing an antistatic sponge according to any one of claims 1 to 7, comprising the steps of: taking the first polyether polyol, the second polyether polyol, the modified second polyether polyol, water, antistatic agent, silicone oil and catalyst, and stirring and uniformly mixing to obtain a mixture; taking isocyanate and adding the isocyanate into the mixed material, and rapidly stirring for 4-5s to obtain foaming slurry; pouring the foaming slurry into a mould for foaming; and curing for 24 hours at 25 ℃ after foaming is finished, and obtaining a finished product.
9. The method for preparing an antistatic sponge according to claim 8, wherein the temperature of the mixture and isocyanate before mixing is 23-25 ℃.
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