CN103394632B - Alcohol-based white coating for sand mold cast iron, and preparation method thereof - Google Patents
Alcohol-based white coating for sand mold cast iron, and preparation method thereof Download PDFInfo
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- CN103394632B CN103394632B CN201310330903.1A CN201310330903A CN103394632B CN 103394632 B CN103394632 B CN 103394632B CN 201310330903 A CN201310330903 A CN 201310330903A CN 103394632 B CN103394632 B CN 103394632B
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- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 32
- 239000004576 sand Substances 0.000 title claims abstract description 31
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 238000000576 coating method Methods 0.000 title claims description 44
- 239000011248 coating agent Substances 0.000 title claims description 22
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000000843 powder Substances 0.000 claims abstract description 58
- 239000003973 paint Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011575 calcium Substances 0.000 claims abstract description 13
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 13
- 229910052903 pyrophyllite Inorganic materials 0.000 claims abstract description 13
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 12
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 12
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 12
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 11
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000005011 phenolic resin Substances 0.000 claims abstract description 11
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 11
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 11
- 239000010456 wollastonite Substances 0.000 claims abstract description 11
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 11
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 19
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 18
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 14
- 239000000084 colloidal system Substances 0.000 claims description 14
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 5
- 125000003172 aldehyde group Chemical group 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims 2
- 229910052906 cristobalite Inorganic materials 0.000 claims 2
- 239000000377 silicon dioxide Substances 0.000 claims 2
- 235000012239 silicon dioxide Nutrition 0.000 claims 2
- 229910052682 stishovite Inorganic materials 0.000 claims 2
- 229910052905 tridymite Inorganic materials 0.000 claims 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 17
- 229910052742 iron Inorganic materials 0.000 abstract description 17
- 239000010439 graphite Substances 0.000 abstract description 15
- 229910002804 graphite Inorganic materials 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000005266 casting Methods 0.000 abstract description 10
- 230000003749 cleanliness Effects 0.000 abstract description 3
- CBECDWUDYQOTSW-UHFFFAOYSA-N 2-ethylbut-3-enal Chemical compound CCC(C=C)C=O CBECDWUDYQOTSW-UHFFFAOYSA-N 0.000 abstract 1
- JTHNLKXLWOXOQK-UHFFFAOYSA-N n-propyl vinyl ketone Natural products CCCC(=O)C=C JTHNLKXLWOXOQK-UHFFFAOYSA-N 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000375 suspending agent Substances 0.000 description 2
- 229910052845 zircon Inorganic materials 0.000 description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 2
- 125000003158 alcohol group Chemical group 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000007903 penetration ability Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
本发明公开了一种砂型铸铁用醇基白色涂料及制备方法，本发明砂型铸铁用醇基白色涂料的各组分配比为：叶蜡石粉50～60重量份，煅烧高岭土粉22～28重量份，硅灰石粉14～18重量份，钾长石粉3～5重量份，钙基累托石粉8～12重量份，三聚磷酸钠3～5重量份，热固性酚醛树脂4～6重量份，聚乙烯醇缩丁醛0.5～0.8重量份，水6～10重量份，甲醇60～70重量份。本发明砂型铸铁用醇基白色涂料可替代醇基石墨类涂料，用于各类砂型铸铁件的生产，可提高铸铁件的表面清洁度，消除铸铁生产中使用石墨类涂料而造成对环境的黑色污染。The invention discloses an alcohol-based white paint for sand cast iron and a preparation method thereof. The ratio of components of the alcohol-based white paint for sand cast iron in the invention is as follows: pyrophyllite powder 50-60 parts by weight, calcined kaolin powder 22-28 parts by weight , 14-18 parts by weight of wollastonite powder, 3-5 parts by weight of potassium feldspar powder, 8-12 parts by weight of calcium-based rectorite powder, 3-5 parts by weight of sodium tripolyphosphate, 4-6 parts by weight of thermosetting phenolic resin, poly 0.5-0.8 parts by weight of vinyl butyral, 6-10 parts by weight of water, and 60-70 parts by weight of methanol. The alcohol-based white paint for sand cast iron of the present invention can replace the alcohol-based graphite paint, and is used in the production of various sand mold iron castings, which can improve the surface cleanliness of the cast iron and eliminate the blackness to the environment caused by the use of graphite paint in cast iron production. pollute.
Description
技术领域 technical field
本发明属于铸铁用造型材料领域，涉及一种砂型铸铁用醇基白色涂料及其制备方法。 The invention belongs to the field of molding materials for cast iron, and relates to an alcohol-based white paint for sand cast iron and a preparation method thereof.
背景技术 Background technique
在砂型铸铁件生产中，为了得到光洁的铸铁件，在砂型表面必须涂刷石墨类涂料或石墨-硅铝酸盐复合浅色涂料。石墨有很高的熔点（＞3000℃），且石墨涂层不被铁水润湿，避免了铁水渗透涂层或砂型空隙，防止了铸铁件产生粘砂缺陷。先前研究表明，除了石墨类涂料，锆英粉涂料用于生产铸铁件，也有比较好的防粘砂效果。而其它硅铝酸盐类涂料，如石英粉涂料、刚玉粉涂料、铝钒土涂料等，均能被铁水润湿，铁水易渗入涂层耐火骨料颗粒间隙，使涂料层紧紧粘附在铸件表面，无法去除，形成粘粉缺陷。由于锆英粉涂料价格昂贵，成本无法与石墨类涂料相竞争，在铸铁生产中鲜有应用。因此，用于铸铁件生产的铸铁涂料基本是石墨类涂料。根据涂料所用载体不同，铸铁用砂型涂料可分二大类，一类是醇基铸铁涂料，另一类是水基铸铁涂料。由于醇基铸铁涂料操作简便，生产效率高，当今铸铁用涂料以醇基石墨类涂料为主，约占整个石墨类涂料的90%以上。尽管石墨类涂料在铸铁生产中有比较好的效果，但是，涂料中的超细石墨黑色粉末易粘附在铸铁件表面，极难清除，降低其清洁度；飘散在空气中，对环境造成黑色污染，其使用越来越受到限制。 In the production of sand mold iron castings, in order to obtain smooth iron castings, graphite paint or graphite-aluminosilicate composite light-color paint must be painted on the surface of the sand mold. Graphite has a very high melting point (>3000°C), and the graphite coating is not wetted by molten iron, which avoids the penetration of molten iron into the coating or the voids of the sand mold, and prevents sand sticking defects in iron castings. Previous studies have shown that in addition to graphite-based coatings, zircon powder coatings are used to produce iron castings, and they also have a better anti-sticking sand effect. Other aluminosilicate coatings, such as quartz powder coatings, corundum powder coatings, bauxite coatings, etc., can be wetted by molten iron, and the molten iron can easily penetrate into the gaps between the refractory aggregate particles of the coating, making the coating layer tightly adhered to the coating. The surface of the casting cannot be removed, forming sticky powder defects. Due to the high price of zircon powder coatings, the cost cannot compete with graphite coatings, so it is rarely used in cast iron production. Therefore, the cast iron coatings used for the production of cast iron parts are basically graphite coatings. According to the different carriers used in the coating, sand mold coatings for cast iron can be divided into two categories, one is alcohol-based cast iron coatings, and the other is water-based cast iron coatings. Due to the easy operation and high production efficiency of alcohol-based cast iron coatings, alcohol-based graphite coatings are the main coatings for cast iron today, accounting for more than 90% of the total graphite coatings. Although graphite-based coatings have a relatively good effect in the production of cast iron, the ultra-fine graphite black powder in the coating is easy to adhere to the surface of the cast iron, which is extremely difficult to remove and reduces its cleanliness; it is scattered in the air and causes black pollution to the environment. pollution, and its use is increasingly restricted.
发明内容 Contents of the invention
本发明所要解决的技术问题是提供一种砂型铸铁用醇基白色涂料，用它不仅能够防止铸铁件产生粘砂、粘粉缺陷，提高铸铁件的表面清洁度，而且还能解决目前铸铁生产中石墨类涂料所造成的黑色粉末污染环境的问题。本发明还提供了这种涂料的制备方法。 The technical problem to be solved by the present invention is to provide an alcohol-based white paint for sand cast iron, which can not only prevent the sand and powder sticking defects of cast iron, improve the surface cleanliness of cast iron, but also solve the problem of current cast iron production. The black powder caused by graphite coatings pollutes the environment. The invention also provides a preparation method of the coating.
一种砂型铸铁用醇基白色涂料，其组分和重量份为： A kind of alcohol-based white paint for sand mold cast iron, its component and parts by weight are:
叶蜡石粉50～60份； 50-60 parts of pyrophyllite powder;
煅烧高岭土粉22～28份； 22-28 parts of calcined kaolin powder;
硅灰石粉14～18份； 14-18 parts of wollastonite powder;
钾长石粉3～5份； 3-5 parts of potassium feldspar powder;
钙基累托石8～12份； 8-12 parts of calcium-based rectorite;
三聚磷酸钠3～5份； 3-5 parts of sodium tripolyphosphate;
热固性酚醛树脂4～6份； 4-6 parts of thermosetting phenolic resin;
聚乙烯醇缩丁醛0.5～0.8份； 0.5-0.8 parts of polyvinyl butyral;
水6～10份； 6-10 parts of water;
甲醇60～70份。 60-70 parts of methanol.
所述叶蜡石粉，粒度为325～400目，其中Al2O3 质量含量为18～20%，SiO2质量含量为68～72%。 The pyrophyllite powder has a particle size of 325-400 mesh, wherein the mass content of Al 2 O 3 is 18-20%, and the mass content of SiO 2 is 68-72%.
所述煅烧高岭土粉，粒度为1260～1500目，其中SiO2质量含量为50～54%，Al2O3质量含量为28～32%。 The calcined kaolin powder has a particle size of 1260-1500 mesh, wherein the mass content of SiO 2 is 50-54%, and the mass content of Al 2 O 3 is 28-32%.
所述硅灰石粉，粒度为600～800目，其中SiO2质量含量为45～55%，CaO质量含量为38～45%。 The wollastonite powder has a particle size of 600-800 mesh, wherein the mass content of SiO 2 is 45-55%, and the mass content of CaO is 38-45%.
所述钾长石粉，粒度为800～1200目，其中SiO2质量含量为65～72%，Al2O3质量含量为13～17%，K2O质量含量为 8～10%，Na2O质量含量为1.8～2.8%。 The potassium feldspar powder has a particle size of 800-1200 mesh, wherein the mass content of SiO 2 is 65-72%, the mass content of Al 2 O 3 is 13-17%, the mass content of K 2 O is 8-10%, and the mass content of Na 2 O is 65-72%. The mass content is 1.8-2.8%.
所述钙基累托石，其性能指标为：胶质价≥60mL/15g,膨胀值≥10mL/3g。 The performance index of the calcium-based rectorite is: colloid value ≥ 60mL/15g, expansion value ≥ 10mL/3g.
所述热固性酚醛树脂，其游离酚≤12%，固含量≥80%，粘度为600～1000s。 The thermosetting phenolic resin has a free phenol≤12%, a solid content≥80%, and a viscosity of 600-1000s.
所述聚乙烯醇缩丁醛，醛基为78～86%，羟基为15～18%，粘度为25～40 cps。 The polyvinyl butyral has 78-86% aldehyde groups, 15-18% hydroxyl groups, and 25-40 cps viscosity.
所用甲醇纯度要求不高，达到95wt%即可满足质量要求。 The purity requirement of the methanol used is not high, reaching 95wt% can meet the quality requirement.
上述砂型铸铁用醇基白色涂料的制备方法，包括如下步骤： The preparation method of above-mentioned alcohol base white paint for sand cast iron comprises the steps:
a） 将6～10重量份的水加热到100℃，再在热水中加入3～5重量份的三聚磷酸钠并溶解成透明状，再加入8～12重量份的钙基累托石粉，搅拌均匀，倒入胶体磨中研磨10～15min，制成膏料A； a) Heat 6-10 parts by weight of water to 100°C, then add 3-5 parts by weight of sodium tripolyphosphate into the hot water and dissolve it into a transparent state, then add 8-12 parts by weight of calcium-based rectorite powder , stir evenly, pour into a colloid mill and grind for 10-15 minutes to make paste A;
b） 将0.5～0.8重量份的聚乙烯醇缩丁醛，与8～11重量份的甲醇混合，并溶解成透明状态，再加入4～6重量份的热固性酚醛树脂，搅拌均匀，制成溶胶B； b) Mix 0.5-0.8 parts by weight of polyvinyl butyral with 8-11 parts by weight of methanol, and dissolve it into a transparent state, then add 4-6 parts by weight of thermosetting phenolic resin, stir evenly, and make a sol B;
c） 将膏料A、溶胶B、22～25重量份的甲醇倒入涂料搅拌机中，先搅拌均匀，再将50～60重量份的叶蜡石粉、22～28重量份的煅烧高岭土粉，14～18重量份的硅灰石粉，3～5重量份的钾长石粉加入搅拌机中，搅拌成稠状涂料膏C； c) Pour paste A, sol B, and 22 to 25 parts by weight of methanol into a paint mixer, stir evenly, and then add 50 to 60 parts by weight of pyrophyllite powder, 22 to 28 parts by weight of calcined kaolin powder, 14 Add ~18 parts by weight of wollastonite powder and 3~5 parts by weight of potassium feldspar powder into the mixer, and stir to form a thick coating paste C;
d） 将稠状涂料膏C倒入胶体磨中，研磨10~15 min出料，倒入搅拌机，再加入25～27重量份的甲醇，搅拌成稀膏浆状，再加入甲醇5~7重量份，调整涂料密度到1.35～1.50g/cm3。 d) Pour the thick paint paste C into the colloid mill, grind for 10-15 minutes to discharge the material, pour it into the mixer, then add 25-27 parts by weight of methanol, stir to form a thin paste, and then add 5-7 parts by weight of methanol parts, adjust the paint density to 1.35~1.50g/cm 3 .
本发明的砂型铸铁用醇基白色涂料，属于非石墨类复合耐火骨料涂料，涂料中使用的耐火骨料、悬浮剂等粉状材料的颜色均为白色或白灰色，不会造成黑色污染。用它替代醇基石墨类涂料，用于砂型铸铁件生产，不仅能够防止铸铁件产生粘砂、粘粉缺陷，得到清洁的铸铁件，还能解决目前铸铁件生产中石墨粉末黑色污染环境的问题。另外，本砂型铸铁用醇基白色涂料所用甲醇纯度要求不高，达到95%即可满足质量要求，这对降低这种涂料的生产与使用成本具有现实意义。 The alcohol-based white paint for sand cast iron of the present invention belongs to the non-graphite composite refractory aggregate paint, and the powdery materials such as refractory aggregate and suspending agent used in the paint are all white or white-gray, and will not cause black pollution. Use it to replace alcohol-based graphite coatings for the production of sand mold iron castings. It can not only prevent sand and powder sticking defects in iron castings, obtain clean iron castings, but also solve the problem of black graphite powder polluting the environment in the production of iron castings. . In addition, the purity of methanol used in the alcohol-based white paint for sand cast iron is not high, and 95% can meet the quality requirements, which has practical significance for reducing the production and use costs of this paint.
具体实施方式 Detailed ways
下面结合实施例对本发明进一步说明。 Below in conjunction with embodiment the present invention is further described.
实施例1：砂型铸铁用醇基白色涂料制作一 Embodiment 1: Alcohol-based white paint for sand mold cast iron is made one
1）将6重量份的水加热到100℃，再在热水中加入3重量份的三聚磷酸钠并溶解成透明状，再加入8重量份的钙基累托石粉（其性能指标为：胶质价≥60mL/15g,膨胀值≥10mL/3g），搅拌均匀，倒入胶体磨中研磨10min，制成膏料A。 1) Heat 6 parts by weight of water to 100°C, then add 3 parts by weight of sodium tripolyphosphate into the hot water and dissolve it into a transparent state, then add 8 parts by weight of calcium-based rectorite powder (its performance index is: Colloid value ≥ 60mL/15g, expansion value ≥ 10mL/3g), stir evenly, pour into the colloid mill and grind for 10min to make paste A.
2）将0.5重量份的聚乙烯醇缩丁醛（醛基为78～86%，羟基为15～18%，粘度为25～40 cps），与8重量份的甲醇混合，并溶解成透明状态，再加入4重量份的热固性酚醛树脂（其游离酚≤12%，固含量≥80%，粘度为600～1000s），搅拌均匀，制成溶胶B。 2) Mix 0.5 parts by weight of polyvinyl butyral (78-86% of aldehyde groups, 15-18% of hydroxyl groups, and 25-40 cps of viscosity) with 8 parts by weight of methanol, and dissolve it into a transparent state , and then add 4 parts by weight of thermosetting phenolic resin (free phenol ≤ 12%, solid content ≥ 80%, viscosity 600-1000s), stir well, and make sol B.
3）将膏料A、溶胶B、22重量份的甲醇倒入涂料搅拌机中，先搅拌均匀，再将50重量份的叶蜡石粉（粒度为325～400目，其中Al2O3 质量含量为18～20%，SiO2质量含量为68～72%）、22重量份的煅烧高岭土粉（粒度为1260～1500目，其中SiO2质量含量为50～54%，Al2O3质量含量为28～32%），14重量份的硅灰石粉（粒度为600～800目，其中SiO2质量含量为45～55%，CaO质量含量为38～45%），3重量份的钾长石粉（粒度为800～1200目，其中SiO2质量含量为65～72%，Al2O3质量含量为13～17%，K2O质量含量为 8～10%，Na2O质量含量为1.8～2.8%）加入低速搅拌机中（转速100r/min），搅拌成稠状涂料膏C。 3) Pour the paste A, sol B, and 22 parts by weight of methanol into the paint mixer, first stir evenly, and then add 50 parts by weight of pyrophyllite powder (with a particle size of 325-400 mesh, and the mass content of Al 2 O 3 is 18-20%, SiO 2 mass content is 68-72%), 22 parts by weight of calcined kaolin powder (particle size is 1260-1500 mesh, of which SiO 2 mass content is 50-54%, Al 2 O 3 mass content is 28 ~32%), 14 parts by weight of wollastonite powder (particle size is 600-800 mesh, wherein the mass content of SiO 2 is 45-55%, and the mass content of CaO is 38-45%), 3 parts by weight of potassium feldspar powder (particle size 800-1200 mesh, of which the mass content of SiO 2 is 65-72%, the mass content of Al 2 O 3 is 13-17%, the mass content of K 2 O is 8-10%, and the mass content of Na 2 O is 1.8-2.8% ) into a low-speed mixer (speed 100r/min), and stir to form a thick paste C.
4）将稠状涂料膏C倒入胶体磨中，研磨10 min出料，倒入高速搅拌机（转速800r/min），再加入25重量份的甲醇，搅拌成稀膏浆状，再加入甲醇5~7重量份，调整涂料密度到1.35～1.50g/cm3。 4) Pour the thick paint paste C into the colloid mill, grind for 10 minutes to discharge the material, pour it into a high-speed mixer (speed 800r/min), then add 25 parts by weight of methanol, stir to form a thin paste, and then add methanol 5 ~7 parts by weight, adjust the coating density to 1.35-1.50g/cm 3 .
实施例2：砂型铸铁用醇基白色涂料制作二 Embodiment 2: Alcohol-based white paint is used for sand mold cast iron to make two
1）将8重量份的水加热到100℃，再在热水中加入4重量份的三聚磷酸钠并溶解成透明状，再加入10重量份的钙基累托石粉（其性能指标为：胶质价≥60mL/15g,膨胀值≥10mL/3g），搅拌均匀，倒入胶体磨中研磨12min，制成膏料A。 1) Heat 8 parts by weight of water to 100°C, then add 4 parts by weight of sodium tripolyphosphate into the hot water and dissolve it into a transparent state, then add 10 parts by weight of calcium-based rectorite powder (its performance index is: Colloid value ≥ 60mL/15g, expansion value ≥ 10mL/3g), stir evenly, pour into the colloid mill and grind for 12min to make paste A.
2）将0.6重量份的聚乙烯醇缩丁醛（醛基为78～86%，羟基为15～18%，粘度为25～40 cps），与10重量份的甲醇混合，并溶解成透明状态，再加入5重量份的热固性酚醛树脂（其游离酚≤12%，固含量≥80%，粘度为600～1000s），搅拌均匀，制成溶胶B。 2) Mix 0.6 parts by weight of polyvinyl butyral (78-86% of aldehyde groups, 15-18% of hydroxyl groups, and 25-40 cps of viscosity) with 10 parts by weight of methanol, and dissolve it into a transparent state , and then add 5 parts by weight of thermosetting phenolic resin (free phenol ≤ 12%, solid content ≥ 80%, viscosity 600-1000s), stir well, and make sol B.
3）将膏料A、溶胶B、23重量份的甲醇倒入涂料搅拌机中，先搅拌均匀，再将55重量份的叶蜡石粉（粒度为325～400目，其中Al2O3 质量含量为18～20%，SiO2质量含量为68～72%）、25重量份的煅烧高岭土粉（粒度为1260～1500目，其中SiO2质量含量为50～54%，Al2O3质量含量为28～32%）， 16重量份的硅灰石粉（粒度为600～800目，其中SiO2质量含量为45～55%，CaO质量含量为38～45%），4重量份的钾长石粉（粒度为800～1200目，其中SiO2质量含量为65～72%，Al2O3质量含量为13～17%，K2O质量含量为 8～10%，Na2O质量含量为1.8～2.8%）加入低速搅拌机中（转速100r/min），搅拌成稠状涂料膏C。 3) Pour the paste A, sol B, and 23 parts by weight of methanol into the paint mixer, first stir evenly, and then add 55 parts by weight of pyrophyllite powder (with a particle size of 325-400 mesh, and the mass content of Al 2 O 3 is 18-20%, SiO 2 mass content is 68-72%), 25 parts by weight of calcined kaolin powder (particle size is 1260-1500 mesh, of which SiO 2 mass content is 50-54%, Al 2 O 3 mass content is 28 ~32%), 16 parts by weight of wollastonite powder (grain size is 600-800 mesh, wherein the mass content of SiO 2 is 45-55%, and the mass content of CaO is 38-45%), 4 parts by weight of potassium feldspar powder (grain size 800-1200 mesh, of which the mass content of SiO 2 is 65-72%, the mass content of Al 2 O 3 is 13-17%, the mass content of K 2 O is 8-10%, and the mass content of Na 2 O is 1.8-2.8% ) into a low-speed mixer (speed 100r/min), and stir to form a thick paste C.
4）将稠状涂料膏C倒入胶体磨中，研磨13 min出料，倒入高速搅拌机（转速1000r/min），再加入26重量份的甲醇，搅拌成稀膏浆状，再加入甲醇5~7重量份，调整涂料密度到1.35～1.50g/cm3。 4) Pour the thick paint paste C into the colloid mill, grind for 13 minutes to discharge the material, pour it into a high-speed mixer (speed 1000r/min), then add 26 parts by weight of methanol, stir to form a thin paste, and then add methanol 5 ~7 parts by weight, adjust the coating density to 1.35-1.50g/cm 3 .
实施例3：砂型铸铁用醇基白色涂料制作三 Embodiment 3: Alcohol-based white paint is used for sand cast iron to make three
1）将10重量份的水加热到100℃，再在热水中加入5重量份的三聚磷酸钠并溶解成透明状，再加入12重量份的钙基累托石粉（其性能指标为：胶质价≥60mL/15g,膨胀值≥10mL/3g），搅拌均匀，倒入胶体磨中研磨15min，制成膏料A。 1) Heat 10 parts by weight of water to 100°C, then add 5 parts by weight of sodium tripolyphosphate into the hot water and dissolve it into a transparent state, then add 12 parts by weight of calcium-based rectorite powder (its performance index is: Colloid value ≥ 60mL/15g, expansion value ≥ 10mL/3g), stir evenly, pour into the colloid mill and grind for 15min to make paste A.
2）将0.8重量份的聚乙烯醇缩丁醛（醛基为78～86%，羟基为15～18%，粘度为25～40 cps），与11重量份的甲醇混合，并溶解成透明状态，再加入6重量份的热固性酚醛树脂（其游离酚≤12%，固含量≥80%，粘度为600～1000s），搅拌均匀，制成溶胶B。 2) Mix 0.8 parts by weight of polyvinyl butyral (78-86% of aldehyde groups, 15-18% of hydroxyl groups, and 25-40 cps of viscosity) with 11 parts by weight of methanol, and dissolve it into a transparent state , and then add 6 parts by weight of thermosetting phenolic resin (free phenol ≤ 12%, solid content ≥ 80%, viscosity 600-1000s), stir evenly, and make sol B.
3）将膏料A、溶胶B、25重量份的甲醇倒入涂料搅拌机中，先搅拌均匀，再将60重量份的叶蜡石粉（粒度为325～400目，其中Al2O3 质量含量为18～20%，SiO2质量含量为68～72%）、28重量份的煅烧高岭土粉（粒度为1260～1500目，其中SiO2质量含量为50～54%，Al2O3质量含量为28～32%）， 18重量份的硅灰石粉（粒度为600～800目，其中SiO2质量含量为45～55%，CaO质量含量为38～45%），5重量份的钾长石粉（粒度为800～1200目，其中SiO2质量含量为65～72%，Al2O3质量含量为13～17%，K2O质量含量为 8～10%，Na2O质量含量为1.8～2.8%）加入低速搅拌机中（转速100r/min），搅拌成稠状涂料膏C。 3) Pour the paste A, sol B, and 25 parts by weight of methanol into the paint mixer, first stir evenly, and then add 60 parts by weight of pyrophyllite powder (with a particle size of 325-400 mesh, and the mass content of Al 2 O 3 is 18-20%, SiO 2 mass content is 68-72%), 28 parts by weight of calcined kaolin powder (particle size is 1260-1500 mesh, of which SiO 2 mass content is 50-54%, Al 2 O 3 mass content is 28 ~32%), 18 parts by weight of wollastonite powder (with a particle size of 600-800 mesh, wherein the mass content of SiO 2 is 45-55%, and the mass content of CaO is 38-45%), 5 parts by weight of potassium feldspar powder (particle size 800-1200 mesh, of which the mass content of SiO 2 is 65-72%, the mass content of Al 2 O 3 is 13-17%, the mass content of K 2 O is 8-10%, and the mass content of Na 2 O is 1.8-2.8% ) into a low-speed mixer (speed 100r/min), and stir to form a thick paste C.
4）将稠状涂料膏C倒入胶体磨中，研磨15 min出料，倒入高速搅拌机（转速900r/min），再加入27重量份的甲醇，搅拌成稀膏浆状，再加入甲醇5~7重量份，调整涂料密度到1.35～1.50g/cm3。 4) Pour the thick paint paste C into the colloid mill, grind it for 15 minutes to discharge the material, pour it into a high-speed mixer (rotating speed 900r/min), then add 27 parts by weight of methanol, stir to form a thin paste, and then add methanol 5 ~7 parts by weight, adjust the coating density to 1.35-1.50g/cm 3 .
实施例1~3所得涂料在1.35～1.50g/cm3的涂刷密度下，其技术指标如表1。 The technical indicators of the paints obtained in Examples 1 to 3 are shown in Table 1 at a brushing density of 1.35 to 1.50 g/cm 3 .
表 1 实施例1~3所得涂料的技术指标 Table 1 The technical indicators of the coatings obtained in Examples 1 to 3
本发明砂型铸铁用醇基白色涂料的防粘砂设计原理是:叶腊石粉具有片状结构或滑腻感，实验发现，叶腊石不被铁水完全润湿，并且有较高的耐火度，与石墨粉相似，在涂料中作主要骨料；煅烧高岭土耐火度高，结构稳定，超细粒度，具有很好的覆盖及渗透能力，填充砂型空隙，起到在砂型内部建立防粘砂隔离层的作用；硅灰石中含有大量氧化钙（CaO），氧化钙不被铁水润湿，且能与叶腊石、煅烧高岭土形成少量低熔点粘稠相，填补涂层空隙，形成密封层，防止铁水渗透砂型；涂料中加入少量钾长石粉，进一步增强涂层烧结。 The anti-sticking sand design principle of the alcohol-based white paint for sand cast iron of the present invention is: pyrophyllite powder has a sheet structure or a greasy feeling, and the experiment finds that pyrophyllite is not completely wetted by molten iron, and has a higher refractoriness, which is comparable to graphite powder Similarly, it is used as the main aggregate in coatings; calcined kaolin has high refractoriness, stable structure, ultra-fine particle size, good coverage and penetration ability, fills the voids of sand molds, and plays the role of establishing an anti-sticking sand isolation layer inside the sand mold; Wollastonite contains a large amount of calcium oxide (CaO), which is not wetted by molten iron, and can form a small amount of low melting point viscous phase with pyrophyllite and calcined kaolin to fill the gaps in the coating and form a sealing layer to prevent molten iron from penetrating into the sand mold; coating A small amount of potassium feldspar powder is added to further enhance the sintering of the coating.
涂料中采用了钙基累托石粉作悬浮剂，钙基累托石具有悬浮稳定性高，耐火度高等特点，除此之外，最大的优点是在铁水高温作用下，涂层中的钙基累托石基本不收缩开裂，保证了涂层的热稳定性。 Calcium-based rectorite powder is used as the suspending agent in the coating. Calcium-based rectorite has the characteristics of high suspension stability and high refractoriness. In addition, the biggest advantage is that the calcium-based rectorite in the coating can Rectorite basically does not shrink and crack, which ensures the thermal stability of the coating.
在涂料中，热固性酚醛树脂在涂层点火干燥过程中就能形成不熔不溶的体型结构，使涂料层具有常温强度，防止涂料层掉粉、起皮；三聚磷酸钠是不定形耐火材料常用的高温粘结剂，在铁水的浇注温度下，它能与涂料中耐火骨料、型砂烧结成致密陶瓷结构，防止涂料层脱落或剥离。 In the coating, the thermosetting phenolic resin can form an infusible and insoluble body structure during the ignition and drying process of the coating, so that the coating layer has normal temperature strength and prevents the coating layer from powdering and peeling; sodium tripolyphosphate is commonly used in amorphous refractory materials At the pouring temperature of molten iron, it can sinter with the refractory aggregate and molding sand in the coating to form a dense ceramic structure, preventing the coating layer from falling off or peeling off.
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